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PCF8574DWR - 8-Bit 100kHz I2C I/O Expander | Texas Instruments (Tape & Reel)
PCF8574DWR

PCF8574DWR - 8-Bit 100kHz I2C I/O Expander | Texas Instruments (Tape & Reel)

Texas Instruments PCF8574DWR is an 8-bit I2C I/O expander with a 100 kHz bus, eight quasi-bidirectional ports, and an interrupt output, supplied in a 16-SOIC package. According to the manufacturer product page, it supports 2.5 V to 5.5 V operation, while the manufacturer datasheet search result describes 2.5 V to 6 V VCC operation. The device adds eight parallel digital lines to a host microcontroller without consuming eight dedicated GPIO pins. An I/O expander is an interface IC that translates serial I2C commands into parallel digital inputs or outputs. The PCF8574 belongs to the parallel-port expansion and I2C interface hierarchy. It uses two bus lines, SCL and SDA, to receive configuration and port-state data from a microcontroller, then presents P0 through P7 as individually controlled digital ports. Its interrupt output allows a host to react when an input condition changes without continuously polling the bus. The principal features include eight I/O ports, a maximum I2C clock frequency of 100 kHz, a 2.5 V to 6 V VCC operating range stated in the datasheet, and low standby-current consumption with a listed maximum standby current of 10 µA. The open-drain interrupt output is compatible with common microcontroller interrupt inputs. The 16-SOIC package is a surface-mount SOIC-16 footprint, and the DWR tape-and-reel ordering code must not be confused with the DW tube ordering code. The quasi-bidirectional port architecture makes the PCF8574 useful for simple control and status signals. A port can be written as an output or sampled as an input, but the electrical behavior and pull-up implementation require care when driving external loads. The interrupt pin provides an event-oriented alternative to periodic reads when one or more input lines change state. Firmware must also verify the device address and bus pull-up arrangement when multiple expanders share the same two-wire bus. Typical applications include keypad and control-panel scanning, relay or solenoid control, LED indication, sensor and switch input aggregation, industrial control modules, and general embedded systems where a microcontroller has too few GPIO pins. The expander is particularly useful when the required signals are simple logic levels and the bus is already present. It is less suitable when high-speed edge-sensitive inputs, high-current output drive, or strong isolation requirements are present. Designers should verify pull-up resistors on SDA and SCL, ensure that all connected devices use compatible voltage levels, and account for total bus capacitance. Port pins intended as inputs should not be forced into incompatible logic states, while output loads should remain within verified current and voltage limits. This page combines the supplied manufacturer and distributor data with practical design guidance, comparison parameters, and sourcing information.

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PCF8574N - 8-Bit 100kHz I2C I/O Expander | Texas Instruments
PCF8574N

PCF8574N - 8-Bit 100kHz I2C I/O Expander | Texas Instruments

The Texas Instruments PCF8574N is an 8-bit bidirectional I/O expander for the I2C bus, operating from 2.5V to 6V with a 100kHz interface and housed in a 16-pin PDIP package. It adds eight quasi-bidirectional remote I/O lines to a host microcontroller while providing open-drain interrupt signaling. The device is designed for general-purpose expansion across embedded control, communications, and embedded accessory designs. What is an I2C I/O expander? An I/O expander is an interface IC that translates serial bus commands into parallel digital signals. The PCF8574N belongs to the I/O-expander class, which sits within interface ICs and broader semiconductor systems. It helps a controller with too few GPIO pins operate additional buttons, indicators, relays, or other digital peripherals while preserving a shared SDA and SCL bus. Key features include eight I/O ports, 100kHz I2C operation, a 2.5V to 6V supply range, and an interrupt output. Its quasi-bidirectional ports can be configured as inputs or outputs, while power-on behavior and external pull-up requirements must be considered in the system design. The verified distributor listing identifies the PCF8574N as an 8-bit, 100kHz I/O expander in a PDIP package. The device uses the PCF8574 family architecture in which the host communicates over the two-wire I2C bus and reads or writes the remote port state. Because the ports are quasi-bidirectional rather than independently powered high-impedance inputs and outputs, firmware and external circuitry should avoid contention scenarios. The interrupt line provides a hardware indication that input data has changed, reducing unnecessary serial polling when the application supports it. Typical applications include microcontroller GPIO expansion, keypad and control panels, relay or indicator interfaces, industrial automation modules, communications equipment, and embedded systems using the site-listed STM32, ATMEGA, MSP430, or other microcontroller families. The same I2C bus can support multiple addressed peripherals, subject to the device address configuration and bus capacitance requirements. Designers should follow the manufacturer datasheet for pull-up resistor selection, address strapping, decoupling, input/output polarity, and interrupt handling. Confirm the available voltage range against the connected bus and peripherals, and verify absolute maximum ratings before using the device in systems with long cables or exposed connectors. The 16-pin PDIP package favors through-hole prototyping rather than compact surface-mount production. This page combines the verified manufacturer and distributor information for PCF8574N with package, selection, design, and application guidance. It is intended to help engineers identify whether the part fits a particular I2C expansion requirement before comparing alternatives or requesting supply.

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PCF8574NG4 - 8-Bit I2C I/O Expander | Texas Instruments
PCF8574NG4

PCF8574NG4 - 8-Bit I2C I/O Expander | Texas Instruments

The Texas Instruments PCF8574NG4 is an 8-bit I/O expander for the two-line bidirectional I2C bus, operating from 2.5 V to 6 V VCC at a maximum bus frequency of 100 kHz. It is housed in a 16-pin PDIP package measuring 0.300 inches with 7.62 mm lead spacing. The device expands one I2C controller into eight quasi-bidirectional GPIO lines for sensors, relays, switches, logic controls, and other external interfaces. An I/O expander is an interface IC that extends the number of general-purpose inputs and outputs available to a microcontroller or other host processor. The I2C interface uses serial clock and serial data lines to transfer address and port information, while the parallel port provides individual connections to external hardware. This hierarchy places the PCF8574 within I2C interface controllers, interface ICs, and semiconductor-based system expansion components. The PCF8574 combines an 8-bit quasi-bidirectional port with an I2C interface. Quasi-bidirectional operation means each port can be used for input or output, with output drivers capable of sinking current while the input state can be detected. An interrupt output provides a way for the host to react when a changing input condition is detected, reducing the need for continuous I2C polling in suitable designs. The 2.5 V to 6 V VCC range allows the device to operate with both 3.3 V and 5 V system rails. Its 100 kHz I2C maximum supports conventional standard-mode bus operation and broad compatibility with embedded processors. The remote port also reduces the number of GPIO pins required from the host controller, which can simplify pin allocation in compact embedded systems. Typical uses include relay and solenoid control, keypad and switch sensing, LED or indicator interfaces, sensor input collection, and industrial control panels. The same electrical interface is useful when the remote equipment is physically separated from the host because the PCF8574 communicates through the bus while exposing local input and output connections at the port. Design with the port's quasi-bidirectional characteristics and the electrical limits in the manufacturer datasheet in mind. Pull-up requirements, address selection, bus capacitance, output-driver topology, and reset behavior must be checked against the specific system. Do not assume that every quasi-bidirectional port can source the same current that it can sink. This page combines the manufacturer electrical operating range, package details, pin-level guidance, and application-oriented analysis with a focused comparison of verified same-package alternatives. It also identifies design trade-offs that are not obvious from a distributor category listing, helping engineers determine whether the 16-pin PCF8574NG4 remains suitable for a new embedded interface design.

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PCF8574PW - 8-bit I2C I/O Expander 20-TSSOP | Texas Instruments (Tape & Reel)
PCF8574PW

PCF8574PW - 8-bit I2C I/O Expander 20-TSSOP | Texas Instruments (Tape & Reel)

The Texas Instruments PCF8574PW is a remote 8-bit I/O expander for the I2C bus, designed for 2.5 V to 6 V VCC operation, packaged in a 20-pin TSSOP (PW) with Tape and Reel packaging. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface (serial clock SCL, serial data SDA) and supports an interrupt (INT) output to flag input changes to the host. An I/O expander is a type of interface IC that sits between a host controller (typically a microcontroller with limited GPIO) and external peripherals, translating a serial bus into multiple parallel digital lines. The PCF8574 belongs to the I2C I/O expander family -> interface IC -> integrated circuit -> semiconductor. By cascading multiple devices, designers can scale I/O count without redesigning the host board, making I/O expanders essential in space-constrained and pin-limited embedded designs. Key features include 8 quasi-bidirectional I/O pins, 100 kHz I2C clock rate, three hardware address pins (A0-A2) allowing up to 8 devices on the same bus (16 combined with PCF8574A), an active-low interrupt output that wakes the host on input changes, and low standby current of 2.5 uA typical. The PCF8574 uses the I2C address base 0x20 (PCF8574A uses 0x38), supporting up to 16 devices on a single bus for 128 I/Os. The quasi-bidirectional I/O architecture eliminates the need for a direction control register by using a clever pull-up/pull-down scheme, simplifying firmware. Each I/O can source 25 mA (LED drive capability) and sink up to 25 mA, sufficient to drive LEDs, keypads, or relay coils directly without buffering. Typical applications include keypad scanning for human-machine interfaces, LED driving for status indicators and display backlights, GPIO expansion for Raspberry Pi or ESP32-based projects, and industrial control panels. The wide 2.5 V to 6 V VCC range allows interfacing with both 3.3 V and 5 V logic without level shifters. When designing with this device, note that quasi-bidirectional I/Os are weak when transitioning to high - add an external pull-up resistor (typically 10 kohm) if driving heavy capacitive loads. The INT pin must be acknowledged by the host to clear the interrupt condition. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PCF8574PWR - 8-bit I2C I/O Expander 20-TSSOP | Texas Instruments
PCF8574PWR

PCF8574PWR - 8-bit I2C I/O Expander 20-TSSOP | Texas Instruments

The Texas Instruments PCF8574PWR is a remote 8-bit I/O expander for the I2C bus, designed for 2.5 V to 6 V VCC operation, packaged in a 20-pin TSSOP (PW) with Tape and Reel packaging. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface (serial clock SCL, serial data SDA) and supports an interrupt (INT) output to flag input changes to the host. An I/O expander is a type of interface IC that sits between a host controller (typically a microcontroller with limited GPIO) and external peripherals, translating a serial bus into multiple parallel digital lines. The PCF8574 belongs to the I2C I/O expander family -> interface IC -> integrated circuit -> semiconductor. By cascading multiple devices, designers can scale I/O count without redesigning the host board, making I/O expanders essential in space-constrained and pin-limited embedded designs. Key features include 8 quasi-bidirectional I/O pins, 100 kHz I2C clock rate, three hardware address pins (A0-A2) allowing up to 8 devices on the same bus (16 combined with PCF8574A), an active-low interrupt output that wakes the host on input changes, and low standby current of 2.5 uA typical. The PCF8574 uses the I2C address base 0x20 (PCF8574A uses 0x38), supporting up to 16 devices on a single bus for 128 I/Os. The quasi-bidirectional I/O architecture eliminates the need for a direction control register by using a clever pull-up/pull-down scheme, simplifying firmware. Each I/O can source 25 mA (LED drive capability) and sink up to 25 mA, sufficient to drive LEDs, keypads, or relay coils directly without buffering. Typical applications include keypad scanning for human-machine interfaces, LED driving for status indicators and display backlights, GPIO expansion for Raspberry Pi or ESP32-based projects, and industrial control panels. The wide 2.5 V to 6 V VCC range allows interfacing with both 3.3 V and 5 V logic without level shifters. When designing with this device, note that quasi-bidirectional I/Os are weak when transitioning to high - add an external pull-up resistor (typically 10 kohm) if driving heavy capacitive loads. The INT pin must be acknowledged by the host to clear the interrupt condition. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PCF8574T - 8-bit I2C I/O Expander, SOIC-16 | NXP Semiconductors
PCF8574T

PCF8574T - 8-bit I2C I/O Expander, SOIC-16 | NXP Semiconductors

The NXP Semiconductors PCF8574T is a remote 8-bit CMOS I/O expander for the two-line bidirectional I2C-bus, supporting 2.5V to 6V VCC operation and providing general-purpose remote I/O expansion for most microcontroller families. The PCF8574T integrates a quasi-bidirectional 8-bit parallel I/O port (P0-P7), an I2C-bus interface, and a hardware interrupt output (INT) that signals the host controller when input state changes, all in a 16-pin SOIC surface-mount package. What is an I/O expander? An I/O expander is an integrated circuit that adds additional general-purpose input/output pins to a microcontroller through a serial bus (typically I2C or SPI). It sits in the hierarchy: GPIO extender -> I/O expander -> interface IC -> digital semiconductor. The PCF8574T specifically uses a quasi-bidirectional I/O architecture that eliminates the need for a direction control register - each pin can be used as either input or output without explicit mode configuration. Key features of the PCF8574T include three hardware address pins (A0-A2) that allow up to 8 PCF8574T devices to share the same I2C-bus (selectable I2C addresses 0x20-0x27). The quasi-bidirectional I/O architecture requires no direction register, simplifying software drivers. The open-drain interrupt output (INT) is asserted when any input changes, enabling efficient event-driven polling. The device operates across 2.5V-6V VCC, supports I2C standard-mode (100 kHz) and fast-mode (400 kHz), and consumes very low standby current. The PCF8574T uses a silicon CMOS process with an open-drain interrupt line and open-drain bidirectional I/O pins. The quasi-bidirectional architecture drives a weak pull-up (current source) when outputs are HIGH and a strong pull-down when LOW, allowing the same pin to be read back without changing direction. The I2C slave address is programmed via A0, A1, A2; slave base address is 0x20 for PCF8574 and 0x38 for PCF8574A - this distinction is critical when selecting between variants. Typical applications include keypad scanning on human-machine interfaces (HMIs), LED driving on display panels and indicator boards, LCD bias generation, sensor monitoring via additional GPIOs, and adding GPIOs to small microcontrollers. The 0x20-0x27 address range also makes it ideal for multi-bus I/O expansion where multiple expanders must coexist. When designing with the PCF8574T, add 100 kohm pull-up resistors on SDA and SCL because the PCF8574T uses open-drain drivers (no internal pull-ups). Note that the "T" suffix denotes the SOIC-16 package, while "N" denotes DIP-16 and "BS" denotes SSOP-16 - same silicon die, different packages. The PCF8574 (base address 0x20) and PCF8574A (base address 0x38) are NOT drop-in replaceable without changing the host firmware address. This page consolidates distributor pricing, parametric equivalents (TI PCA9534, PCA9554, PCA9557), drop-in alternatives in the SOIC-16 footprint, and practical design notes not found in the manufacturer datasheet.

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PCF8574TD - 8-bit I2C I/O Expander, SO-16 | NXP Semiconductors
PCF8574TD

PCF8574TD - 8-bit I2C I/O Expander, SO-16 | NXP Semiconductors

The NXP PCF8574TD is a remote 8-bit I/O expander for the I2C-bus, supplied in a 16-pin SO (Small Outline) package with a -40C to +85C industrial temperature grade. The device operates from 2.5 V to 6 V VCC and provides eight quasi-bidirectional input/output pins that can be independently assigned as inputs or outputs, all controlled through the standard two-wire I2C interface. An I2C I/O expander is a type of interface IC that sits between a microcontroller and peripheral signals, translating serial commands from the I2C bus into parallel GPIO operations. The PCF8574 belongs to the I/O expander sub-category of interface ICs, itself part of the broader power management and inter-chip communication hierarchy. By adding eight extra quasi-bidirectional ports over only two wires, the PCF8574 lets small microcontrollers control keypads, LCDs, LEDs, and relays without sacrificing native pins for other functions. Key features of the PCF8574TD include a maximum standby current of 10 uA, an open-drain interrupt output (INT) that signals the host when an input changes state, and three hardware address pins (A0-A2) that allow up to eight PCF8574 devices on the same I2C bus (64 I/O lines). The quasi-bidirectional I/O architecture requires no direction-control register: a pin set HIGH is weakly pulled up (~100 uA source), and a pin set LOW is strongly pulled down, simplifying firmware and PCB layout. The PCF8574 uses a fixed I2C slave address of 0x20-0x27 (set by A2:A0), which distinguishes it from the PCF8574A variant (address range 0x38-0x3F). Both share the same SO-16 footprint, enabling dual-sourcing designs. The silicon CMOS process keeps quiescent current low enough for battery-backed applications. Typical applications include keypad scanning, LED driving arrays, LCD module backpacks, relay/Opto-coupler interfacing, and general-purpose GPIO expansion on 8051, ARM Cortex-M, ESP32, PIC, AVR, and MSP430 microcontrollers. The interrupt pin eliminates polling overhead in button or switch-matrix designs. When designing with this device, place a 0.1 uF decoupling capacitor close to VCC and 100 kohm pull-up resistors on SDA, SCL, and INT. Verify your firmware does not read the input port during the I2C ACK bit, as a transient high-current condition can occur on the quasi-bidi pins. This page synthesizes distributor pricing, drop-in alternatives (same-brand NXP variants and cross-brand TI equivalents), and practical design notes that complement, rather than duplicate, the manufacturer datasheet.

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PCF8575CDB - 16-Bit I2C I/O Expander | Texas Instruments
PCF8575CDB

PCF8575CDB - 16-Bit I2C I/O Expander | Texas Instruments

The Texas Instruments PCF8575CDB is a 16-bit I2C/SMBus I/O expander with interrupt output, a 2.5 V to 5.5 V operating range, and a 24-pin SSOP package. It supports I2C operation up to 400 kHz and uses three hardware address pins to allow up to eight devices on one bus. Its open-drain interrupt output provides a low-power way for a connected microcontroller to detect a change on one of 16 remote I/O lines. An I2C I/O expander is a peripheral interface device that converts a serial two-wire connection into additional parallel input or output lines. It belongs to the interface IC hierarchy, where an I/O expander sits between a host microcontroller and external control or sensing circuits. This parallel-to-serial expansion reduces pin count and allows buttons, LEDs, relays, or digital status signals to be connected over a shared bus. The PCF8575CDB provides 16 general-purpose remote I/O lines, three hardware address inputs, SCL and SDA bus connections, an active-low open-drain interrupt output, a 2.5 V to 5.5 V supply range, and operation up to 400 kHz. Three address pins permit eight distinct bus addresses. The interrupt output also supports low standby-current operation, with a maximum standby-current figure of 10 uA identified in the manufacturer documentation. Communication with the device occurs through the two-wire I2C or SMBus-compatible interface. The address pins select the device address without additional external components, while the interrupt line allows the host to avoid continuous polling when a monitored remote input changes state. As a quasi-bidirectional I2C interface, the implementation should be evaluated against the pull-up and bus-drive requirements described in the manufacturer datasheet. Typical uses include expanding microcontroller GPIO for LED indicators and pushbuttons, reading switches and interlocks, controlling relay or solenoid drivers, and building keypad or alarm panels. The 16-bit port is especially useful where a controller must monitor more inputs or drive more outputs than its native package allows. Multiple devices can share the bus when their hardware address pins are configured differently. PCB implementation requires correct pull-up placement for SDA and SCL, unobstructed routing between the expander and its address-setting hardware, and adequate decoupling near the supply pins. Because the interrupt output is open drain, its external pull-up must also be arranged to suit the host’s input and operating voltage. Confirm package pin numbering and signal names against the manufacturer datasheet before finalizing the board layout. This product page combines the manufacturer’s electrical and ordering information with practical implementation guidance, drop-in replacement analysis, and application-oriented design notes. It helps engineers evaluate whether the PCF8575CDB’s 16 lines, addressability, interrupt behavior, and 400 kHz bus capability fit a new embedded control design.

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PCF8575CDW - 16-Bit I2C I/O Expander | Texas Instruments
PCF8575CDW

PCF8575CDW - 16-Bit I2C I/O Expander | Texas Instruments

Texas Instruments PCF8575CDW is a 16-bit I2C/SMBus I/O expander with interrupt output, a 2.5 V to 5.5 V operating range, and a 400 kHz bus interface in a 24-pin SOIC package. It adds 16 quasi-bidirectional digital lines to a host microcontroller while requiring only serial clock, serial data, address-selection, power, ground, and interrupt connections. An I/O expander is an interface IC that increases the number of digital input/output lines available to a microcontroller, embedded processor, or other bus controller. Its hierarchy is I/O expander → bus interface expander → digital interface IC → semiconductor. Unlike a dedicated GPIO controller, the PCF8575 family uses a compact I2C/SMBus register interface and quasi-bidirectional ports that can operate as inputs or outputs without separate direction registers. The principal features are 16 independently usable I/O pins, a 2.5 V to 5.5 V supply range, interrupt support, and 400 kHz operation. Each port has latched output capability with high-current drive suitable for directly driving LEDs. At power-on, the I/O pins enter a high state. The interrupt output provides a hardware indication that an input or selected port event requires host attention, reducing unnecessary serial polling. The PCF8575CDW uses a serial protocol compatible with I2C and SMBus systems. Three address-selection pins allow multiple expanders to coexist on the same bus by assigning different device addresses. The 16 quasi-bidirectional lines are organized as P00 through P07 and P10 through P15. Their architecture makes the device practical for translating a compact microcontroller footprint into a larger control interface without adding individual GPIO packages. Typical applications include LED status and signage control, keypad or button matrix interfaces, relay and solenoid control, industrial automation modules, digital sensor gathering, and general-purpose embedded-control boards. The interrupt output is particularly useful when numerous remote inputs must be monitored across multiple PCF8575 devices while keeping the host's serial traffic low. Designers should account for the quasi-bidirectional port architecture, confirm pull-up requirements for SDA and SCL, and ensure the host bus voltage is compatible with the expander's supply. Address pins must be configured before all devices on a shared bus communicate. The 24-pin SOIC footprint also requires adequate spacing between adjacent pins for soldering and inspection. This product page organizes the PCF8575CDW's principal electrical characteristics, pin assignments, interface considerations, same-package replacement candidates, and practical design guidance. It also distinguishes the ordering suffix from functional differences, helping engineers evaluate PCB reuse without relying only on a basic distributor description.

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PCF8575CPW - 16-Bit I2C I/O Expander with Interrupt | Texas Instruments
PCF8575CPW

PCF8575CPW - 16-Bit I2C I/O Expander with Interrupt | Texas Instruments

Texas Instruments PCF8575CPW is a 16-bit I2C/SMBus I/O expander with interrupt capability, operating from 4.5 V to 5.5 V and supporting I2C communication up to 400 kHz. It is packaged in a 24-pin TSSOP package, designated PW, for surface-mount PCB designs. An I/O expander is an interface IC that increases the number of general-purpose input and output lines available to a microcontroller or other embedded controller. The PCF8575CPW uses a two-wire serial bus with SCL and SDA signals, allowing 16 quasi-bidirectional ports to be accessed through a compact serial interface. This is particularly useful when a host controller has insufficient GPIO pins for buttons, relays, indicators, or other peripherals. The PCF8575 family provides a 16-bit quasi-bidirectional port and an I2C interface. Its latched outputs support direct LED driving, while the quasi-bidirectional inputs can be read by the host through the serial bus. The device also includes an interrupt output, allowing the connected controller to respond when an input state changes rather than continuously polling every port. The PCF8575CPW is designed for 4.5 V to 5.5 V VCC operation and uses address pins to allow multiple expanders to coexist on the same bus. The I2C interface operates at up to 400 kHz, making the device appropriate for embedded systems, control boards, industrial interfaces, and small peripheral expansion designs. Typical applications include keypad scanners, LED indicator panels, relay and transistor control, sensor and switch input modules, and general-purpose I2C GPIO expansion. The 24-pin TSSOP package supports compact surface-mount layouts, while external pull-up resistors are normally required on SDA and SCL according to the bus implementation guidance in the manufacturer datasheet. For new designs, check the PCF8575CPW pin description table and electrical characteristics in the manufacturer datasheet before assigning PCB tracks or selecting external pull-up resistors. The interrupt line and address pins require careful placement so that multiple expanders can be cascaded without address conflicts. This page combines the manufacturer product information, distributor listing data, package details, comparison references, and application-oriented design guidance to support component selection and PCB implementation.

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PCF8575DB - 16-Bit I2C I/O Expander | Texas Instruments
PCF8575DB

PCF8575DB - 16-Bit I2C I/O Expander | Texas Instruments

Texas Instruments PCF8575DB is a 16-bit remote I/O expander for I2C and SMBus systems, operating from 2.5 V to 5.5 V with bus speeds up to 400 kHz in a 24-pin SSOP package. Its two 8-bit quasi-bidirectional ports, P07–P00 and P17–P10, can be individually configured as inputs or outputs without a separate data-direction register. The device also includes an open-drain interrupt output and three hardware address inputs, allowing as many as eight devices to share an I2C bus. An I/O expander is an interface IC that extends the number of digital input and output lines available to a microcontroller or other host processor. The PCF8575 belongs to the I2C interface IC hierarchy and uses a serial command-and-data bus to transfer port state over two wires. Its 16 quasi-bidirectional lines can reduce the number of GPIO pins required by a host while remaining suitable for common logic-level inputs, relay-control signals, status indicators, and LED loads. Each quasi-bidirectional I/O has latched output capability and high-current drive for directly driving LEDs. The same line can be read as an input without changing the output latch, although the electrical behavior differs from a conventional push-pull output. At power-on, all I/O ports are high. The three address pins provide hardware-selectable device addresses for a maximum of eight PCF8575 devices on one bus, while the open-drain interrupt output provides a hardware indication of input-port state changes. The interface supports both I2C and SMBus operation, and the verified product information identifies operation up to 400 kHz. Low standby-current consumption is specified at a maximum of 10 µA. These characteristics make the device useful in embedded systems where bus wiring, connector pin count, standby power, or host GPIO availability constrain the design. The 24-pin SSOP, identified by distributor records as SSOP-24 with a 5.30 mm width and 0.209 inch lead spacing, supports compact surface-mount assembly. Typical uses include reading switches and keypads, driving LED indicators, monitoring digital control signals, controlling discrete transistors or relays, and expanding I/O in industrial controllers, appliance controllers, test equipment, and microcontroller boards. Because the interrupt output is open-drain, multiple interrupt-capable devices can share a common signal when the system supports wired-AND behavior. Firmware must also account for the I2C address, port polarity, and quasi-bidirectional input current requirements. The primary design consideration is choosing the pull-up voltage and ensuring that the bus capacitance and wiring permit reliable operation at 400 kHz. I2C pull-up resistors should be placed on the host side of long or branched wiring, and software should acknowledge only the interrupt source determined by the device address. The available verified material does not provide a complete pin table, explicit price values, or detailed absolute-maximum ratings. This product page consolidates the verified manufacturer description, distributor package identification, I2C features, interrupt behavior, power-on state, and available substitute references. It also adds application guidance, engineering caveats, and a transparent distinction between verified specifications and parameters that still require confirmation from the complete manufacturer datasheet.

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PCF8575DBR - 16-Bit I2C I/O Expander | Texas Instruments (Tape & Reel)
PCF8575DBR

PCF8575DBR - 16-Bit I2C I/O Expander | Texas Instruments (Tape & Reel)

Texas Instruments PCF8575DBR is a 16-bit remote I/O expander for I2C and SMBus systems, operating from 2.5 V to 5.5 V with bus speeds up to 400 kHz in a 24-pin SSOP package. Its two 8-bit quasi-bidirectional ports, P07–P00 and P17–P10, can be individually configured as inputs or outputs without a separate data-direction register. The device also includes an open-drain interrupt output and three hardware address inputs, allowing as many as eight devices to share an I2C bus. An I/O expander is an interface IC that extends the number of digital input and output lines available to a microcontroller or other host processor. The PCF8575 belongs to the I2C interface IC hierarchy and uses a serial command-and-data bus to transfer port state over two wires. Its 16 quasi-bidirectional lines can reduce the number of GPIO pins required by a host while remaining suitable for common logic-level inputs, relay-control signals, status indicators, and LED loads. Each quasi-bidirectional I/O has latched output capability and high-current drive for directly driving LEDs. The same line can be read as an input without changing the output latch, although the electrical behavior differs from a conventional push-pull output. At power-on, all I/O ports are high. The three address pins provide hardware-selectable device addresses for a maximum of eight PCF8575 devices on one bus, while the open-drain interrupt output provides a hardware indication of input-port state changes. The interface supports both I2C and SMBus operation, and the verified product information identifies operation up to 400 kHz. Low standby-current consumption is specified at a maximum of 10 µA. These characteristics make the device useful in embedded systems where bus wiring, connector pin count, standby power, or host GPIO availability constrain the design. The 24-pin SSOP, identified by distributor records as SSOP-24 with a 5.30 mm width and 0.209 inch lead spacing, supports compact surface-mount assembly. Typical uses include reading switches and keypads, driving LED indicators, monitoring digital control signals, controlling discrete transistors or relays, and expanding I/O in industrial controllers, appliance controllers, test equipment, and microcontroller boards. Because the interrupt output is open-drain, multiple interrupt-capable devices can share a common signal when the system supports wired-AND behavior. Firmware must also account for the I2C address, port polarity, and quasi-bidirectional input current requirements. The primary design consideration is choosing the pull-up voltage and ensuring that the bus capacitance and wiring permit reliable operation at 400 kHz. I2C pull-up resistors should be placed on the host side of long or branched wiring, and software should acknowledge only the interrupt source determined by the device address. The available verified material does not provide a complete pin table, explicit price values, or detailed absolute-maximum ratings. This product page consolidates the verified manufacturer description, distributor package identification, I2C features, interrupt behavior, power-on state, and available substitute references. It also adds application guidance, engineering caveats, and a transparent distinction between verified specifications and parameters that still require confirmation from the complete manufacturer datasheet.

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PCF8575DW - 16-Bit I2C I/O Expander | Texas Instruments
PCF8575DW

PCF8575DW - 16-Bit I2C I/O Expander | Texas Instruments

The Texas Instruments PCF8575DW is a 16-bit I2C/SMBus remote I/O expander with interrupt output, designed for 2.5 V to 5.5 V operation and packaged in a 24-pin SOIC. It provides 16 general-purpose digital I/O lines through a two-wire serial interface, making it useful for expanding microcontroller pin availability in embedded control systems. The device supports a 400 kHz fast I2C bus and includes three hardware address pins for addressing up to eight devices on the same bus. An I/O expander is an interface IC that translates serial bus commands into parallel digital input or output lines. The PCF8575 belongs to the I2C I/O expander category, within interface ICs and broader semiconductor power and signal-conditioning systems. Its design allows a host microcontroller to control or monitor multiple discrete digital signals while conserving the limited I/O pins available on small microcontrollers. Key features include 16 I/O lines, an operating supply range of 2.5 V to 5.5 V, a maximum I2C clock frequency of 400 kHz, low standby-current consumption of 10 uA maximum, and an open-drain interrupt output. The outputs are latched and can provide high-current drive capability for directly driving LEDs. A current source connected to VCC also allows outputs to be actively driven high for systems that require an active-high output state. The PCF8575DW communicates through SCL and SDA, with three address pins selecting one of eight possible bus addresses. The interrupt output provides a hardware indication that an input state has changed, allowing the host controller to respond without continuously polling the expander. The 400 kHz bus rate supports efficient transfers between the controller and the expanded I/O bank, while the 2.5 V to 5.5 V supply range supports both 3.3 V and 5 V systems. Typical applications include industrial control panels, keypad and button interfaces, LED status indicators, relay or transistor control, sensor and switch monitoring, and general-purpose embedded system I/O expansion. The PCF8575DW is particularly suitable when a controller has insufficient GPIO pins for external switches, indicators, or actuators. Its interrupt output can reduce host processing time when multiple remote inputs require attention. When designing around the PCF8575DW, confirm the controller's I2C voltage, pull-up resistor arrangement, address selection, and the electrical requirements of every connected load. The open-drain interrupt output requires appropriate pull-up treatment, and LED or relay loads must remain within the device's stated drive and current limits. The 24-pin SOIC footprint is intended for surface-mount PCB assembly. This product page combines the verified manufacturer and distributor descriptions, packaging information, source links, and engineering-oriented design guidance for engineers evaluating the PCF8575DW. It distinguishes verified facts from unavailable detailed specifications and provides practical context for choosing a 16-bit I2C/SMBus I/O expander in embedded control designs.

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PCF8575DWR - 16-Bit I2C I/O Expander | Texas Instruments
PCF8575DWR

PCF8575DWR - 16-Bit I2C I/O Expander | Texas Instruments

The Texas Instruments PCF8575DWR is a 16-bit I2C and SMBus I/O expander with interrupt, operating from 2.5 V to 5.5 V in a 24-pin SOIC (DW) package. It adds 16 latched quasi-bidirectional I/O lines to a host microcontroller through a two-wire serial bus, supports operation up to 400 kHz, and provides three hardware address pins for connecting up to eight devices on one bus. The device also includes an open-drain interrupt output for change notification. An I/O expander is an interface IC that converts serial commands from a microcontroller into parallel input or output signals. In the product hierarchy, the PCF8575 belongs to the I2C GPIO expander class, within interface ICs and broader digital semiconductor systems. It is useful when a controller needs more GPIO pins than are available directly, avoiding a redesign or the addition of a larger microcontroller package. Key features include 16 independently latched I/O ports, a 2.5 V to 5.5 V supply range, 400 kHz fast I2C operation, and low standby-current consumption of 10 uA maximum. Three hardware address pins provide eight selectable bus addresses. The outputs can latch data for direct LED drive and include a current source to VCC for actively driving a high. An open-drain interrupt output allows a controller to react to selected input changes without continuously polling the device. The PCF8575 implements a simple register-based interface in which the 16 ports are used for data transfer, configuration, and output control. Its quasi-bidirectional I/O structure suits many microcontroller systems, although each pin is intended primarily for ordinary digital loads rather than unrestricted capacitive or high-current loads. Power and signal behavior remain compatible with the 2.5 V to 5.5 V operating range stated by Texas Instruments. Typical applications include industrial control modules, keypad and switch interfaces, LED status panels, relay or solenoid driver boards, building-automation equipment, and small embedded control systems. The device is particularly useful when a host controller needs 16 additional lines while retaining a compact 24-pin SOIC footprint and a two-wire connection to the main PCB. Designers should account for the quasi-bidirectional output architecture, use appropriate pull-up arrangements for open-drain interrupt signaling, and confirm that connected loads remain within the device's output-drive limits. I2C pull-up resistance and bus capacitance should be selected for the full system, including cable length, bus speed, and the number of devices. This page combines manufacturer specifications, distributor availability, package details, practical application guidance, and same-footprint replacement analysis to support faster component selection and PCB-level decision-making.

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PCF8575PW - 16-Bit I2C I/O Expander | Texas Instruments
PCF8575PW

PCF8575PW - 16-Bit I2C I/O Expander | Texas Instruments

Texas Instruments PCF8575PW is a 16-bit I2C/SMBus I/O expander with interrupt output, operating from 2.5 V to 5.5 V and supporting bus speeds up to 400 kHz. The device is packaged in a 24-pin TSSOP (PW) package and provides three hardware address inputs for operating as many as eight devices on one bus. An I/O expander is an interface IC that converts a serial two-wire bus into additional parallel input and output lines. In the product hierarchy, the PCF8575 belongs to the I/O expander class, interface ICs, and integrated circuits. It allows a microcontroller with limited GPIO pins to control or monitor additional external signals without requiring a large number of direct host-controller pins. Key features include 16 individually controlled I/O lines, an open-drain interrupt output, and a maximum standby-current consumption of 10 µA. The three address pins allow up to eight PCF8575 devices to share an I2C bus. Outputs are latched and have high-current drive capability for directly driving LEDs, while a current source to VCC supports actively driving a high output state. The PCF8575 interface uses SCL and SDA for serial communication and provides an open-drain interrupt for signaling the host controller. Its 400 kHz fast-I2C capability suits embedded control systems operating at moderate bus rates. The device is compatible with most microcontrollers, making it useful where firmware and board space make another dedicated parallel interface impractical. Typical uses include LED panels, key scanners, relay or switch controls, sensor and switch inputs, and general-purpose remote I/O in industrial, consumer, communications, and embedded systems. Each of the 16 I/O ports can be configured as an input or output through the serial interface, while the interrupt output can reduce unnecessary host-controller polling. Designers should account for the open-drain nature of the interrupt and I2C bus, provide suitable pull-up resistors, confirm address configuration, and review the datasheet for power-on output states and current limits. External drivers may be required when a load exceeds the device's specified drive capability. This page consolidates verified manufacturer and distributor information, documents where detailed ratings are unavailable, and distinguishes true package-compatible alternatives from look-alike expanders whose register behavior differs. It also provides application-specific engineering guidance that helps engineers evaluate the PCF8575PW before committing it to an existing PCB.

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PCF8575PWR - 16-Bit I2C I/O Expander | Texas Instruments
PCF8575PWR

PCF8575PWR - 16-Bit I2C I/O Expander | Texas Instruments

The Texas Instruments PCF8575PWR is a 16-bit I2C/SMBus I/O expander with an interrupt output, a 2.5 V to 5.5 V operating range, and a 400 kHz bus rate. The device is packaged in a 24-pin TSSOP and adds 16 quasi-bidirectional I/O lines to a host controller over a two-wire serial interface. An I/O expander is an interface IC that extends the number of digital input and output pins available to a microcontroller or other embedded controller. The PCF8575 sits between the host processor and external peripherals, using I2C or SMBus for command and data transfer while presenting a parallel port to connected circuitry. Its two independent eight-bit ports support both input and output operation without separate data-direction registers. The PCF8575PWR provides 16 quasi-bidirectional I/O lines, with each line usable as an input or output. Its latched outputs have high-current drive capability for directly driving LEDs. Three hardware address pins allow up to eight devices to share the same I2C bus, while the open-drain interrupt output provides a hardware indication of input-port activity. The interface supports operation up to 400 kHz, and standby current consumption is specified at no more than 10 microamperes. All I/O pins are high at power-on, which provides a defined reset state for the output latch. The quasi-bidirectional architecture includes a weak current source toward VCC, so engineers should account for this behavior when designing inputs, pull-ups, and output transitions. Typical uses include expanding a limited microcontroller pin count for LEDs, switches, keypads, sensors, relay-control logic, and simple digital display interfaces. Because the device communicates over I2C or SMBus, it is particularly useful when a design needs many slow-changing digital lines but cannot allocate a dedicated parallel port on the host controller. A key design consideration is the difference between quasi-bidirectional inputs and conventional push-pull outputs. Pull-up requirements, leakage currents, and the desired high or low state must be evaluated for every connected signal. Designers should also confirm address selection, interrupt handling, and supply levels before assigning functions to the two eight-bit ports. This product page organizes the manufacturer specifications, pin assignments, application guidance, and same-footprint alternatives into an engineering-focused reference. It also distinguishes direct pin-compatible choices from related expanders whose input or reset behavior differs, helping simplify design validation without obscuring the trade-offs that matter on the PCB.

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PCF8591T - 8-bit I2C ADC/DAC, 4-Ch Input | NXP Semiconductors
PCF8591T

PCF8591T - 8-bit I2C ADC/DAC, 4-Ch Input | NXP Semiconductors

The NXP PCF8591T is a single-chip, single-supply, low-power 8-bit CMOS data acquisition device that integrates four analog inputs, one analog output, and a serial I2C-bus interface in a 16-pin SO (SOT162-1) surface-mount package. The PCF8591T combines an 8-bit successive-approximation A/D converter and a single 8-bit D/A converter on the same die, allowing a single I2C addressable device to handle both digitizing external analog signals and reconstructing an analog voltage for control or waveform output. The maximum I2C-bus clock operates up to 11.1 kHz symbol rate per the DigiKey listing. What is an 8-bit data acquisition IC? A data acquisition (DAQ) IC is a mixed-signal integrated circuit that bridges the analog and digital domains, typically containing one or more analog-to-digital converters (ADCs) and sometimes digital-to-analog converters (DACs) along with a digital interface for a host microcontroller. Within the broader taxonomy, the PCF8591T is an 8-bit successive-approximation ADC with an 8-bit DAC, controlled via an I2C serial interface - falling into the category of low-speed, low-resolution, system-management data converters used for sensor reading, setpoint generation, and analog control loops in embedded designs. Key features of the PCF8591T include four multiplexed single-ended analog inputs (or three differential inputs selectable via the control byte), one rail-to-rail analog output, three hardware address pins (A0-A2) allowing up to eight devices on the same I2C bus without glue logic, and a single 2.5V to 6V supply. The on-chip track-and-hold and successive-approximation ADC delivers 8-bit resolution at typical conversion rates suitable for sensor monitoring and process control. The DAC section can be configured for 4-quadrant multiplication when an external reference is supplied, enabling digitally controlled gain and offset in signal-conditioning paths. Typical applications include battery monitoring, industrial process-variable sensing (temperature, pressure, flow), LED brightness and contrast control via the DAC, closed-loop analog control in HVAC and appliance designs, and hobbyist/educational platforms (Raspberry Pi and Arduino sensor shields). The wide supply range (2.5V-6V) and low standby current also suit portable instrumentation and remote sensor nodes. When designing with the PCF8591T, ensure the I2C pull-ups are sized for the bus capacitance and clock speed, place a 0.1uF decoupling capacitor close to VDD, and respect the address-pin strapping (A0-A2) so multiple devices coexist on the same bus. The analog inputs are not 5V-tolerant above VDD; use a resistive divider or op-amp buffer when sensing higher voltages.

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PCF8593T/1,118 - I2C RTC Clock/Calendar, 8-SOIC | NXP Semiconductors
PCF8593T/1,118

PCF8593T/1,118 - I2C RTC Clock/Calendar, 8-SOIC | NXP Semiconductors

The NXP Semiconductors PCF8593T/1,118 is a CMOS Real-Time Clock (RTC) and calendar circuit optimized for low power consumption, housed in an 8-pin SOIC (SOT96-1) package. The device provides an 8-bit serial interface over the industry-standard I2C (2-wire) bus, supports a supply voltage range of 2.5 V to 6.0 V, and integrates a 32.768 kHz oscillator circuit that drives timekeeping, calendar, and counter functions in the first 8 bytes of internal RAM. A Real-Time Clock (RTC) is a dedicated integrated circuit that keeps track of current time and date (typically seconds, minutes, hours, days, weekdays, months, years) even when the main system power is removed, usually backed by a small battery or supercapacitor. Within the broader component taxonomy, an RTC sits under the clock & timing category, which itself is a subset of integrated circuits. RTCs are essential building blocks for any embedded design that needs time-of-day awareness: from data loggers and metering equipment to industrial controllers and consumer appliances. The PCF8593 represents the classic low-power serial-RTC architecture that has dominated I2C-based designs since the 1990s. Key features of the PCF8593T/1,118 include 240 bytes of general-purpose static RAM available beyond the timekeeping registers, a programmable 32.768 kHz oscillator with on-chip load capacitors, automatic word-address increment after each read/write byte, a 24-hour or 12-hour format option, and low standby current in the microamp range. The 8-SOIC package is industry standard (3.90 mm body width), making the device drop-in compatible with the classic 8-pin DIP footprint pad layout when designed with the SOIC land pattern. The internal address counter eliminates the need for burst-mode addressing in firmware, simplifying I2C driver code. Typical applications include battery-backed wall-clock modules for appliances, time-of-day stamping in metering and data-acquisition systems, low-power sensor nodes that wake periodically and need an accurate timestamp, industrial programmable logic controllers (PLCs) that log events, and consumer electronics such as VCRs, set-top boxes, and audio gear that must retain clock time across power cycles. When designing with this part, place the 32.768 kHz watch crystal as close as possible to the OSCO/OSCI pins to minimize parasitic capacitance, ensure the I2C pull-up resistors are sized correctly for the bus capacitance, and keep the backup battery path well-decoupled to survive brown-outs. The part is approaching end-of-life per the NXP product page, so designers should evaluate the PCF85263A or PCF8563 as pin-compatible modern replacements for new designs.

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PCI4451GJG - Integrated PC Card & 1394 OHCI Controller | TI
PCI4451GJG

PCI4451GJG - Integrated PC Card & 1394 OHCI Controller | TI

The Texas Instruments PCI4451GJG is an integrated PC Card controller and 1394 (FireWire) OHCI controller that combines dual-slot CardBus (PCMCIA) support with a single 400 Mbps IEEE 1394a link in a single PCI device. It supports two independent PC Card slots compliant with the 1997 PC Card Standard, provides a 32-bit CardBus bridge for both slots, and integrates a 3.3 V physical layer for IEEE 1394 with one fully compliant cable port at 100/200/400 Mbps. The device is offered in a 257-ball MicroStar BGA (GJG) package, 16x16 mm, designed for space-constrained add-in cards and embedded platforms. Key features include PCI 2.2 host-side compliance, integrated 1394 OHCI 1.1 controller with cable power management, support for Zoom Video (ZV) port, ACPI 1.0 compliant power management with D0/D1/D2/D3 states and PME#, and programmable CardBus signal voltage (3.3 V / 5 V / VPP). The integrated PHY removes the need for an external 1394 link-layer chip, reducing both BOM count and PCB area versus two-chip implementations. Technically, the PCI4451 uses a single 33 MHz, 32-bit PCI bus to bridge the host CPU to two PC Card sockets and one 1394 port. Internal DMA engines handle PC Card data movement with scatter-gather support, while a dedicated 1394 PHY implements bus-reset, arbitration, and cable-not-active detection per IEEE 1394a-2000. CardBus card insertion/removal is managed by per-socket card detect and voltage sense pins that feed the integrated socket controller. Typical applications include legacy industrial PCs, test and measurement chassis with PC Card (PCMCIA) data acquisition modules, docking stations, embedded military/aerospace single-board computers, and add-in Combo cards (CardBus + 1394a) for legacy Windows XP / Windows 2000 platforms where both buses remain in active service for instrumentation capture. When designing, observe the 257-ball BGA escape pattern: route CardBus data, address and control signals on the outer two rows of balls and place the 1394 cable port traces near the package edge to minimize stub length. A 27 MHz crystal with the on-chip PLL provides the 1394 PHY clock; follow TI's reference layout for the PHY section to remain IEEE 1394a compliant. This page synthesizes distributor pricing, exact-package alternatives, and practical design notes not found in the manufacturer datasheet alone.

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PCM1600Y - 24-Bit 6-Channel 96kHz DAC | Texas Instruments
PCM1600Y

PCM1600Y - 24-Bit 6-Channel 96kHz DAC | Texas Instruments

The Texas Instruments PCM1600Y is a 24-bit, 6-channel, 96kHz-sampling enhanced multilevel delta-sigma digital-to-analog converter in a 48-pin LQFP package. It supports Standard, I2S, and left-justified audio data interfaces with user-selectable 16-, 18-, 20-, and 24-bit data lengths. According to the manufacturer datasheet, the device operates with +VCC = 5V and +VDD = 3.3V under the stated test conditions. Its 6-channel architecture makes it suitable for multichannel audio equipment, home-theater systems, digital mixing consoles, and automotive or industrial audio platforms that require multiple synchronized analog outputs. A delta-sigma DAC is a digital-to-analog converter category that uses noise shaping and digital filtering to convert PCM audio samples into continuous analog voltages. Within the broader hierarchy, PCM1600Y is an audio DAC, which is an ADC/DAC interface device and part of the broader semiconductor and signal-conversion product family. Its SoundPlus architecture combines 24-bit quantization with a 96kHz sampling capability, providing a direct conversion path for multichannel digital audio. Verified features include 24-bit resolution, six output channels, 96kHz sampling, user-selectable Standard, I2S, and left-justified formats, and selectable 16-, 18-, 20-, or 24-bit input words. The audio data uses MSB-first binary two's-complement formatting. Operating conditions include a +5V analog supply and a +3.3V digital supply in the cited datasheet test setup, enabling a practical separation between analog and digital supply domains. The PCM1600 family is positioned for applications where several audio channels must share a common digital source and clock. Common hardware arrangements route I2S or left-justified PCM data from a source such as a receiver, processor, or digital audio interface into the converter, then send six analog outputs through output filtering and coupling stages. The converter's 48-LQFP package provides 48 externally accessible connections for power, ground, clocks, data, control signals, and analog channels. Typical uses include surround-sound decoding, multichannel music playback, professional digital mixers, automotive audio head units, and industrial audio consoles. In each case, synchronized six-channel conversion reduces the need for multiple discrete DACs while retaining a standardized digital audio interface. The available 100kHz-class I2S listing and the 96kHz sampling description identify PCM1600Y as a high-resolution multichannel converter rather than a low-cost stereo codec. Designers should preserve the required analog and digital supply structure, provide clean references and clocking, and implement the manufacturer's recommended output-filter and bypass networks. Because the provided data does not expose the complete pin list, analog specifications, clock requirements, or recommended passive values, those details must be confirmed in the manufacturer datasheet before schematic release or PCB implementation. This product record combines verified distributor descriptions, the manufacturer-linked PCM1600 family datasheet, same-package alternatives, and practical selection guidance. It also distinguishes documented facts from unavailable parameters so engineers can identify what still requires circuit-level verification without relying on invented electrical values.

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PCM1601Y - 24-Bit 96kHz 6-Channel Audio DAC | Texas Instruments
PCM1601Y

PCM1601Y - 24-Bit 96kHz 6-Channel Audio DAC | Texas Instruments

Texas Instruments PCM1601Y is a 24-bit, 96kHz sampling, six-channel, enhanced multi-level delta-sigma digital-to-analog converter in a 48-MQFP surface-mount package measuring 12mm by 12mm. It accepts I2S digital audio input and provides analog outputs for multichannel audio equipment. The converter supports 3.3V or 5V supply operation and accepts separate analog and digital supply sources, allowing system designers to partition supply requirements according to the analog and digital sections of the design. A multi-channel digital-to-analog converter is an analog-output interface that reconstructs digital PCM audio samples as continuous analog voltage signals. The PCM1601Y belongs to the delta-sigma DAC family, a converter architecture that uses high-frequency oversampling and digital noise shaping to produce a multi-bit analog output from a one-bit internal quantizer. As a six-channel DAC, it can support surround-sound, home-theater, CD-player, DVD-player, and other multichannel audio systems without requiring six separate converter packages. The PCM1601Y provides 24-bit resolution and supports sampling rates up to 96kHz. Its enhanced multi-level architecture is intended to improve linearity and reduce quantization-related distortion relative to simpler converter implementations. The device also accepts 3V to 3.6V or 5V supply configurations, while the availability of separate analog and digital supply connections helps reduce coupling between digital switching activity and sensitive analog output circuitry. Its 48-MQFP package provides a compact surface-mount solution with 0.8mm terminal pitch. The converter is designed for audio systems that require six synchronized analog outputs and an I2S-format digital interface. The 96kHz maximum sampling rate supports high-resolution digital audio sources, while 24-bit data resolution preserves a large numerical range for audio processing. Because the output stage still requires appropriate analog filtering and signal-path design, converter resolution alone does not determine final system signal-to-noise ratio or distortion performance. Those results also depend on clocking, grounding, supply implementation, analog output loading, and the selected reconstruction or post-filter network. Typical PCM1601Y applications include home-theater audio receivers, DVD and CD players, multichannel amplifiers, active speaker electronics, automotive entertainment systems, and professional audio equipment. In each case, the six outputs can serve as the front-left, front-right, center, surround-left, surround-right, and subwoofer channels of a standard surround layout. The converter is particularly useful where multiple digital audio channels must be converted while preserving a common I2S source and sample clock. System design should give particular attention to analog and digital supply routing. The separate analog and digital supply pins should be connected to appropriately filtered sources, with grounding arranged to minimize return-current coupling from digital signals into the analog output network. Decoupling capacitors should be placed close to the relevant supply pins, and the external clock and I2S data lines should be routed away from sensitive analog outputs. The manufacturer datasheet and pinout must be checked against the exact board revision before finalizing the schematic or PCB layout. This product record combines distributor specifications, package information, sourcing details, and engineering guidance for the PCM1601Y. It also separates verified PCM1601Y attributes from parameters that require confirmation from the current Texas Instruments datasheet, helping designers evaluate the six-channel DAC without treating incomplete search snippets as complete device specifications.

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PCM1602KY - 24-Bit 6-Channel 192kHz Audio DAC | Texas Instruments
PCM1602KY

PCM1602KY - 24-Bit 6-Channel 192kHz Audio DAC | Texas Instruments

The Texas Instruments PCM1602KY is a 24-bit, 6-channel enhanced multilevel delta-sigma digital-to-analog converter supporting sampling rates up to 192 kHz and housed in a 48-pin LQFP package. It is designed for multichannel audio systems that require six simultaneous analog output channels, high-resolution digital audio processing, and compact PCB integration. The device is identified as an I2S-compatible audio DAC in its PCM1602KY/2K ordering variant. An audio digital-to-analog converter is a signal-conversion IC that transforms digital audio samples into analog voltage signals suitable for amplification, mixing, recording, or line-level output. Within the signal-chain hierarchy, the PCM1602KY belongs to the DAC family, then to audio converters, interface ICs, and ultimately the broader semiconductor category. Six-channel integration reduces the number of separate converter packages required in home-theater, professional audio, and multichannel playback equipment. The converter operates with 24-bit resolution, reaches a maximum sampling rate of 192 kHz, and provides six output channels. Its enhanced multilevel delta-sigma architecture is intended to support high-resolution audio reconstruction while integrating the digital-to-analog function into one package. The 48-LQFP package provides 48 externally accessible terminals and is suitable for conventional multilayer PCB layouts using surface-mount assembly. Available device information identifies a maximum analog output of 3.41 V, a settling time of 400 microseconds, and an operating temperature range of -25 °C to +85 °C. These ratings define important selection boundaries: the analog output must remain compatible with the downstream amplifier, and the converter should be operated only within its specified temperature range. The 192 kHz capability supports high-resolution source material and professional audio workflows requiring more than the 48 kHz CD base rate. Typical uses include multichannel home-theater preamplifiers, surround-sound audio receivers, active speaker controllers, digital mixing consoles, professional monitoring equipment, and automotive infotainment systems. The six-channel architecture is especially useful when a system requires synchronized analog outputs from one digital audio source. System integrators must still design the digital interface, analog output filtering, grounding, and output coupling around the converter’s specified operating conditions. PCB implementation requires careful treatment of analog and digital return paths, short routing for interface signals, and a stable low-noise supply arrangement. Decoupling should be placed close to the corresponding supply pins, while analog output components should avoid sharing high-current return paths with digital switching circuitry. The six-channel structure reduces package count but still requires balanced component placement and symmetrical routing to minimize channel-to-channel differences. This page consolidates the PCM1602KY’s resolution, channel count, sampling rate, package, operating limits, sourcing path, and application guidance into an engineering-focused reference. It also distinguishes direct ordering variants from true functional alternatives so designers can verify compatibility before committing to a board revision.

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PCM1602Y - 24-Bit 192kHz 6-Channel DAC | Texas Instruments
PCM1602Y

PCM1602Y - 24-Bit 192kHz 6-Channel DAC | Texas Instruments

The Texas Instruments PCM1602Y is a 24-bit, 192kHz sampling, 6-channel enhanced multilevel delta-sigma digital-to-analog converter with an I2S interface, housed in a 48-LQFP 7x7mm surface-mount package. It is designed for high-fidelity multichannel audio systems requiring six digital audio conversion channels in one integrated component. A DAC is a digital-to-analog converter, a signal-conversion IC that transforms sampled digital audio into corresponding analog voltage signals. The PCM1602Y belongs to the broader hierarchy of DAC, audio converter, signal-conversion IC, and semiconductor. Its six-channel architecture reduces the number of separate converters required when reproducing multichannel sound, while the I2S interface supports integration with digital audio processors, receivers, and consumer-audio equipment. Principal features include 24-bit resolution, a maximum sampling rate of 192kHz, and six-channel conversion. The I2S interface provides a conventional digital-audio connection to the surrounding system. The device also uses an enhanced multilevel delta-sigma conversion architecture, combining high-resolution digital-to-analog conversion with an integrated audio-converter format suitable for consumer and professional equipment. Its 48-LQFP package measures 7x7mm. The PCM1602Y supports separate analog and digital supply sources, allowing analog and digital sections to be connected to suitable supply rails. A documented alternative-source description states supply ranges of 3V to 3.6V and 5V, although exact rail assignments and detailed operating limits should be confirmed in the manufacturer datasheet. Because the converter handles six channels, careful treatment of digital clocking, analog output filtering, grounding, and supply decoupling is essential to preserve audio quality. Typical uses include multichannel home-theater audio, powered speakers, AV receivers, digital active speakers, automotive audio systems, and professional playback equipment. The 192kHz sampling capability makes the device appropriate for high-resolution source material, while the six-channel output count suits surround-sound and multi-zone audio architectures. System designers must still ensure that the host processor supplies valid I2S data, required timing, and an appropriate master-clock relationship. For implementation, place decoupling capacitors close to the supply pins and keep the digital interface traces away from sensitive analog output paths. Confirm the manufacturer's recommended analog-output topology and external component values before production. Also verify the exposed-pad, thermal, and PCB-layout requirements associated with the 48-LQFP package rather than relying only on generic package guidance. This page consolidates the verified 24-bit, 192kHz, six-channel, I2S, and 48-LQFP characteristics with distributor pricing, a verified same-package alternative, comparison guidance, and practical integration considerations. It is intended to help engineers evaluate sourcing and design fit while clearly identifying details that still require confirmation from the official datasheet.

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PCM1604Y - 24-Bit 192kHz 6-Channel DAC | Texas Instruments
PCM1604Y

PCM1604Y - 24-Bit 192kHz 6-Channel DAC | Texas Instruments

The Texas Instruments PCM1604Y is a 24-bit, 192kHz sampling, six-channel enhanced multilevel delta-sigma digital-to-analog converter in a 48-LQFP 7x7 mm package. It accepts I2S-formatted digital audio data and converts six audio channels into simultaneous analog outputs. The converter is designed for multichannel audio systems requiring 24-bit resolution, operation up to 192kHz, and a dedicated six-channel DAC architecture. An audio DAC is a mixed-signal semiconductor that reconstructs continuous analog voltage signals from sampled digital audio data. Within the product hierarchy, PCM1604Y is a delta-sigma DAC, which is a digital-to-analog converter type, and ultimately belongs to the broader ADC/DAC and mixed-signal integrated-circuit categories. Delta-sigma architecture is widely used in digital audio because it supports high-resolution conversion, integrated digital filtering, and direct interface with common audio serializers. Key verified features include 24-bit resolution, a maximum sampling rate of 192kHz, six audio channels, enhanced multilevel delta-sigma operation, and I2S data input. These capabilities distinguish the PCM1604Y from lower-channel or lower-resolution converters. The six-channel architecture can reduce the number of separate DAC packages required in a surround-sound, home-theater, professional audio, or other multichannel system, provided the associated analog, clocking, and interface circuitry is designed correctly. The PCM1604Y accepts digital audio through I2S and supplies six analog output channels, making it suitable for designs in which one package handles all primary channel conversions. Its 48-LQFP package provides 48 external terminals and a square 7x7 mm footprint. Because no manufacturer pinout, electrical limits, or recommended application-circuit details were included in the supplied verified data, its clock requirements, output topology, supply voltages, dynamic range, distortion, channel isolation, and decoupling configuration should be confirmed in the manufacturer datasheet before schematic capture. Typical use cases include 5.1-channel and 7.1-channel home-theater receivers, multichannel active speaker systems, AV receivers, digital mixing consoles, audio interfaces, and automotive entertainment systems. In these applications, the PCM1604Y can convert six synchronized I2S channels before line-level amplification, speaker amplification, headphone amplification, or further analog processing. System partitioning should account for the converter's required clocks, analog supplies, output network, and digital input voltage compatibility. A critical design step is to verify the exact 48-pin signal mapping, exposed-pad requirements, supported audio formats, and master-clock relationships against the Texas Instruments datasheet before routing the PCB. Decoupling and analog-output layouts should be developed from the manufacturer's reference design rather than inferred from generic DAC guidance, because unsupported pin assignments, supply values, or output-network assumptions could invalidate the design. This page consolidates the verified distributor and manufacturer-facing information for PCM1604Y with package details, sourcing links, engineering cautions, and an honest assessment of available drop-in alternatives. The comparison focuses on what can be substantiated from the supplied records and explicitly identifies electrical, lifecycle, pinout, pricing, and replacement data that still requires confirmation.

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