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PCA9554DW - 8-Bit I/O Expander | Texas Instruments
PCA9554DW

PCA9554DW - 8-Bit I/O Expander | Texas Instruments

The Texas Instruments PCA9554DW is an 8-bit I2C/SMBus I/O expander with interrupt, weak pull-up, and configuration registers. Its operating supply-voltage range is 2.3 V to 5.5 V, its I2C clock frequency is 400 kHz, and it is supplied in a 16-SOIC package. The device adds eight serial-controlled digital I/O lines to a host processor while conserving microcontroller pins. An I/O expander is an interface IC that converts a serial bus into parallel digital input or output lines. In the product hierarchy, PCA9554DW belongs to I/O expander controllers within interface ICs and broader semiconductor devices. The PCA9554 includes one 8-bit configuration register, input register, output register, and polarity-inversion register. At power-on, its I/O ports are inputs with weak pull-ups, and the system master can subsequently configure each line as input or output. Three hardware address pins, A0, A1, and A2, program the fixed I2C address and allow up to eight devices to share one I2C bus or SMBus. The open-drain active-low interrupt output provides a change notification from the remote I/O ports. According to the Texas Instruments product page, PCA9554 is pin-to-pin and I2C-address compatible with the PCF8574, although software changes are required because PCA9554 adds configuration-register functionality. The PCA9554DW is useful for low-cost control of LEDs, relays, sensors, keys, and other digital peripherals where the host has insufficient GPIO pins. It can reduce MCU package size and pin count, while the interrupt line lets the processor sleep until an input event occurs. Inputs can also be configured with polarity inversion to simplify active-high or active-low system logic. Design attention should focus on bus pull-ups, address selection, output transition timing, and the electrical limits of each remote port. Weak pull-ups are intended primarily for power-up defaults, not as a replacement for strong external pull-ups on a heavily loaded I2C bus. Confirm external-device logic levels and avoid driving a port in a way that conflicts with its alternate input or output function. This page combines verified manufacturer and distributor information with package, application, comparison, and design guidance. It distinguishes confirmed replacements from unverified substitutions and preserves missing electrical values rather than estimating them. The result helps engineers identify whether PCA9554DW fits a new design or whether a documented same-package alternative requires additional validation.

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PCA9554DWR - 8-Bit I/O Expander | Texas Instruments (Tape & Reel)
PCA9554DWR

PCA9554DWR - 8-Bit I/O Expander | Texas Instruments (Tape & Reel)

The Texas Instruments PCA9554DWR is an 8-bit I2C/SMBus I/O expander with interrupt, weak pull-up, and configuration registers. Its operating supply-voltage range is 2.3 V to 5.5 V, its I2C clock frequency is 400 kHz, and it is supplied in a 16-SOIC package. The device adds eight serial-controlled digital I/O lines to a host processor while conserving microcontroller pins. An I/O expander is an interface IC that converts a serial bus into parallel digital input or output lines. In the product hierarchy, PCA9554DWR belongs to I/O expander controllers within interface ICs and broader semiconductor devices. The PCA9554 includes one 8-bit configuration register, input register, output register, and polarity-inversion register. At power-on, its I/O ports are inputs with weak pull-ups, and the system master can subsequently configure each line as input or output. Three hardware address pins, A0, A1, and A2, program the fixed I2C address and allow up to eight devices to share one I2C bus or SMBus. The open-drain active-low interrupt output provides a change notification from the remote I/O ports. According to the Texas Instruments product page, PCA9554 is pin-to-pin and I2C-address compatible with the PCF8574, although software changes are required because PCA9554 adds configuration-register functionality. The PCA9554DWR is useful for low-cost control of LEDs, relays, sensors, keys, and other digital peripherals where the host has insufficient GPIO pins. It can reduce MCU package size and pin count, while the interrupt line lets the processor sleep until an input event occurs. Inputs can also be configured with polarity inversion to simplify active-high or active-low system logic. Design attention should focus on bus pull-ups, address selection, output transition timing, and the electrical limits of each remote port. Weak pull-ups are intended primarily for power-up defaults, not as a replacement for strong external pull-ups on a heavily loaded I2C bus. Confirm external-device logic levels and avoid driving a port in a way that conflicts with its alternate input or output function. This page combines verified manufacturer and distributor information with package, application, comparison, and design guidance. It distinguishes confirmed replacements from unverified substitutions and preserves missing electrical values rather than estimating them. The result helps engineers identify whether PCA9554DWR fits a new design or whether a documented same-package alternative requires additional validation.

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PCA9554PW - 8-Bit I/O Expander with Interrupt | NXP
PCA9554PW

PCA9554PW - 8-Bit I/O Expander with Interrupt | NXP

The NXP Semiconductors PCA9554PW is an 8-bit CMOS I2C/SMBus GPIO expander with interrupt, operating from 2.3 V to 5.5 V and supporting bus speeds up to 400 kHz. It adds eight configurable general-purpose input/output pins to a host controller through the two-wire bus and is packaged in a 16-pin TSSOP. The PCA9554PW also provides configurable input/output polarity and configuration registers, enabling firmware-defined port behavior without consuming additional host GPIO pins. An I2C or SMBus I/O expander is an interface IC that bridges a serial control bus and parallel digital lines. In the product hierarchy, it belongs to interface ICs, then bus interface controllers, then GPIO expanders, and finally semiconductors. It reduces the number of host-controller pins required for control-panel status LEDs, switch inputs, alarm signals, and other low-to-moderate-speed digital I/O. Unlike a microcontroller, the PCA9554PW is not intended to execute application software; a connected processor reads and writes its registers through I2C. The verified product data identifies eight parallel I/O lines, interrupt support, weak pull-up capability, configuration registers, a 2.3 V to 5.5 V supply range, and operation at both 100 kHz and 400 kHz bus rates. Distributor listings identify the PW package as 16-pin TSSOP. These features suit systems where local logic voltage is below 5.5 V and the designer needs deterministic register-based port expansion. The interrupt output can notify the host when a configured input changes, reducing unnecessary polling while preserving straightforward firmware control. The PCA9554 family uses configurable registers to define each port line as input or output and to control input polarity inversion. The verified NXP result specifically distinguishes PCA9554PW from PCA9554A, whose address differs. Firmware, pull-up implementation, and power sequencing therefore need review before substituting the A variant into an existing design. The verified data does not provide complete electrical limits, output-drive capability, timing values, or detailed pin mapping, so those items must be confirmed in the manufacturer datasheet before layout or sign-off. Typical applications include remote control-panel indicators, configuration and mode switches, keypad or button inputs, alarm and interrupt signaling, small industrial modules, and low-speed embedded controllers. Placing eight digital lines behind one I2C address is especially useful when the host MCU has insufficient spare pins. The 400 kHz capability shortens transfer time compared with 100 kHz operation, although actual bus timing remains bounded by the slowest device, pull-up resistance, capacitance, and firmware behavior. Design with the I2C pull-ups on SDA and SCL, keep the interrupt trace short, and confirm signal levels against the host supply. Do not assume that every similarly named PCA9554 device has the same address or register behavior. A socketed prototype should be tested for address conflicts, bus capacitance, input polarity, and active interrupt behavior. This page combines verified manufacturer and distributor facts with engineering guidance while clearly separating unavailable specifications. The product information on this page also highlights why direct MPN review matters: package suffix, address variant, and bus details determine interchangeability. Before ordering or replacing PCA9554PW, verify the exact suffix, lifecycle status, pinout, and electrical limits against current manufacturer documentation.

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PCA9554PWR - 8-Bit I/O Expander with Interrupt | NXP (Tape & Reel)
PCA9554PWR

PCA9554PWR - 8-Bit I/O Expander with Interrupt | NXP (Tape & Reel)

The NXP Semiconductors PCA9554PWR is an 8-bit CMOS I2C/SMBus GPIO expander with interrupt, operating from 2.3 V to 5.5 V and supporting bus speeds up to 400 kHz. It adds eight configurable general-purpose input/output pins to a host controller through the two-wire bus and is packaged in a 16-pin TSSOP. The PCA9554PWR also provides configurable input/output polarity and configuration registers, enabling firmware-defined port behavior without consuming additional host GPIO pins. An I2C or SMBus I/O expander is an interface IC that bridges a serial control bus and parallel digital lines. In the product hierarchy, it belongs to interface ICs, then bus interface controllers, then GPIO expanders, and finally semiconductors. It reduces the number of host-controller pins required for control-panel status LEDs, switch inputs, alarm signals, and other low-to-moderate-speed digital I/O. Unlike a microcontroller, the PCA9554PWR is not intended to execute application software; a connected processor reads and writes its registers through I2C. The verified product data identifies eight parallel I/O lines, interrupt support, weak pull-up capability, configuration registers, a 2.3 V to 5.5 V supply range, and operation at both 100 kHz and 400 kHz bus rates. Distributor listings identify the PW package as 16-pin TSSOP. These features suit systems where local logic voltage is below 5.5 V and the designer needs deterministic register-based port expansion. The interrupt output can notify the host when a configured input changes, reducing unnecessary polling while preserving straightforward firmware control. The PCA9554 family uses configurable registers to define each port line as input or output and to control input polarity inversion. The verified NXP result specifically distinguishes PCA9554PWR from PCA9554A, whose address differs. Firmware, pull-up implementation, and power sequencing therefore need review before substituting the A variant into an existing design. The verified data does not provide complete electrical limits, output-drive capability, timing values, or detailed pin mapping, so those items must be confirmed in the manufacturer datasheet before layout or sign-off. Typical applications include remote control-panel indicators, configuration and mode switches, keypad or button inputs, alarm and interrupt signaling, small industrial modules, and low-speed embedded controllers. Placing eight digital lines behind one I2C address is especially useful when the host MCU has insufficient spare pins. The 400 kHz capability shortens transfer time compared with 100 kHz operation, although actual bus timing remains bounded by the slowest device, pull-up resistance, capacitance, and firmware behavior. Design with the I2C pull-ups on SDA and SCL, keep the interrupt trace short, and confirm signal levels against the host supply. Do not assume that every similarly named PCA9554 device has the same address or register behavior. A socketed prototype should be tested for address conflicts, bus capacitance, input polarity, and active interrupt behavior. This page combines verified manufacturer and distributor facts with engineering guidance while clearly separating unavailable specifications. The product information on this page also highlights why direct MPN review matters: package suffix, address variant, and bus details determine interchangeability. Before ordering or replacing PCA9554PWR, verify the exact suffix, lifecycle status, pinout, and electrical limits against current manufacturer documentation.

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PCA9555DB - 16-Bit I2C GPIO Expander with Interrupt | NXP
PCA9555DB

PCA9555DB - 16-Bit I2C GPIO Expander with Interrupt | NXP

The NXP Semiconductors PCA9555DB is a 16-bit I2C-bus and SMBus GPIO expander with interrupt, operating from 2.3 V to 5.5 V in a 24-pin SSOP package. It provides 16 general-purpose parallel input/output lines, supports 400 kHz serial operation, and uses an open-drain active-low interrupt output. What is an I2C GPIO expander? An I2C GPIO expander is an interface IC that adds parallel digital input and output capability to a controller with limited pins. The PCA9555 belongs to the I/O expander, parallel I/O, interface IC, and semiconductor hierarchy. Its two 8-bit ports connect a microcontroller or processor to switches, indicators, sensors, relays, and other external circuits while keeping the host-side connection compact. Key features include 16 configurable GPIO lines, separate input and output port registers, polarity inversion registers, 5 V tolerant I/O ports, and low standby-current consumption with a maximum of 1 uA. The 2.3 V to 5.5 V operating range supports both 3.3 V and 5 V systems. Its open-drain interrupt output allows multiple change events to be combined on a shared host interrupt line. The device uses a two-wire I2C/SMBus interface with serial clock and serial data connections. A configurable seven-bit address supports multiple expanders on one bus, while 100 kHz and 400 kHz operating modes are identified in the provided NXP-family search data. The SSOP-24 package provides a conventional through-board surface-mount form factor with a 1.0 mm pitch. Typical applications include industrial control panels, programmable relay boards, LED status systems, keypad interfaces, sensor aggregation, and compact embedded control systems. The PCA9555DB is especially useful when a host controller needs more GPIO than its package or board-level pin budget can provide. Designers should confirm address selection, pull-up requirements, input thresholds, output-drive capability, and interrupt polarity against the manufacturer datasheet. Because the verified data does not include pricing or a complete pin-level table, those details remain explicitly unverified rather than inferred.

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PCA9555DBR - 16-Bit I2C GPIO Expander with Interrupt | NXP (Tape & Reel)
PCA9555DBR

PCA9555DBR - 16-Bit I2C GPIO Expander with Interrupt | NXP (Tape & Reel)

The NXP Semiconductors PCA9555DBR is a 16-bit I2C-bus and SMBus GPIO expander with interrupt, operating from 2.3 V to 5.5 V in a 24-pin SSOP package. It provides 16 general-purpose parallel input/output lines, supports 400 kHz serial operation, and uses an open-drain active-low interrupt output. What is an I2C GPIO expander? An I2C GPIO expander is an interface IC that adds parallel digital input and output capability to a controller with limited pins. The PCA9555 belongs to the I/O expander, parallel I/O, interface IC, and semiconductor hierarchy. Its two 8-bit ports connect a microcontroller or processor to switches, indicators, sensors, relays, and other external circuits while keeping the host-side connection compact. Key features include 16 configurable GPIO lines, separate input and output port registers, polarity inversion registers, 5 V tolerant I/O ports, and low standby-current consumption with a maximum of 1 uA. The 2.3 V to 5.5 V operating range supports both 3.3 V and 5 V systems. Its open-drain interrupt output allows multiple change events to be combined on a shared host interrupt line. The device uses a two-wire I2C/SMBus interface with serial clock and serial data connections. A configurable seven-bit address supports multiple expanders on one bus, while 100 kHz and 400 kHz operating modes are identified in the provided NXP-family search data. The SSOP-24 package provides a conventional through-board surface-mount form factor with a 1.0 mm pitch. Typical applications include industrial control panels, programmable relay boards, LED status systems, keypad interfaces, sensor aggregation, and compact embedded control systems. The PCA9555DBR is especially useful when a host controller needs more GPIO than its package or board-level pin budget can provide. Designers should confirm address selection, pull-up requirements, input thresholds, output-drive capability, and interrupt polarity against the manufacturer datasheet. Because the verified data does not include pricing or a complete pin-level table, those details remain explicitly unverified rather than inferred.

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PCA9555DW - 16-Bit I/O Expander, 2.3-5.5V | TI
PCA9555DW

PCA9555DW - 16-Bit I/O Expander, 2.3-5.5V | TI

The Texas Instruments PCA9555DW is a 16-bit I2C/SMBus I/O expander with interrupt, weak pull-up and configuration registers, operating from 2.3V to 5.5V and supporting up to 400kHz bus operation. It is packaged in a 24-pin SOIC (DW) package rated for -40°C to +85°C operation. The device adds two 8-bit parallel I/O ports to a bus controller without requiring a dedicated GPIO controller. An I/O expander is an interface IC that translates serial I2C or SMBus commands into parallel digital input or output signals. In the signal-chain hierarchy, it sits between a microcontroller or embedded processor and external panel buttons, LEDs, relays, sensors, or other digital peripherals. The PCA9555 combines addressable input and output ports with configurable polarity and an interrupt mechanism, reducing host pin count while preserving a simple two-wire control path. Key features include 16 configurable I/O lines, active-low open-drain interrupt output, weak pull-up configuration registers, and compatibility with both I2C and SMBus systems. Each port can be configured independently as input or output through the device registers. Input polarity inversion and output drive behavior can be programmed, allowing the same device to support active-low buttons, indicator circuits, and other digital interfaces. The PCA9555 is controlled through a serial interface using address-select pins and command registers. This makes firmware configuration straightforward when the host already supports I2C. The 400kHz operating capability helps reduce control-loop time when multiple expander devices are present or when the system needs responsive input polling. The device is intended for systems where distributed GPIO expansion is preferable to expanding the host package. Typical applications include industrial control panels, keypad and button interfaces, LED indication, appliance controls, instrumentation, and embedded systems requiring more GPIO than the host microcontroller provides. The 2.3V to 5.5V supply range supports both low-voltage and conventional 5V digital systems. The 24-pin SOIC package also makes the device suitable for through-hole assembly and conventional PCB layouts. When designing around the PCA9555, account for the I2C bus pull-up requirement, correct address selection, and the electrical limits of each output. The interrupt pin should be configured with an appropriate pull-up because it is open-drain and active low. Firmware should also define startup states and port directions before external circuitry becomes active. This page summarizes the verified device identity, package, operating range, interface features, and design implications available for PCA9555DW selection. This information distinguishes the PCA9555DW from generic 8-bit expanders by combining a 16-bit parallel interface, configurable weak pull-ups, polarity control, and interrupt support in a 2.3V to 5.5V SOIC device.

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PCA9555DWR - 16-Bit I/O Expander, 2.3-5.5V | TI (Tape & Reel)
PCA9555DWR

PCA9555DWR - 16-Bit I/O Expander, 2.3-5.5V | TI (Tape & Reel)

The Texas Instruments PCA9555DWR is a 16-bit I2C/SMBus I/O expander with interrupt, weak pull-up and configuration registers, operating from 2.3V to 5.5V and supporting up to 400kHz bus operation. It is packaged in a 24-pin SOIC (DW) package rated for -40°C to +85°C operation. The device adds two 8-bit parallel I/O ports to a bus controller without requiring a dedicated GPIO controller. An I/O expander is an interface IC that translates serial I2C or SMBus commands into parallel digital input or output signals. In the signal-chain hierarchy, it sits between a microcontroller or embedded processor and external panel buttons, LEDs, relays, sensors, or other digital peripherals. The PCA9555 combines addressable input and output ports with configurable polarity and an interrupt mechanism, reducing host pin count while preserving a simple two-wire control path. Key features include 16 configurable I/O lines, active-low open-drain interrupt output, weak pull-up configuration registers, and compatibility with both I2C and SMBus systems. Each port can be configured independently as input or output through the device registers. Input polarity inversion and output drive behavior can be programmed, allowing the same device to support active-low buttons, indicator circuits, and other digital interfaces. The PCA9555 is controlled through a serial interface using address-select pins and command registers. This makes firmware configuration straightforward when the host already supports I2C. The 400kHz operating capability helps reduce control-loop time when multiple expander devices are present or when the system needs responsive input polling. The device is intended for systems where distributed GPIO expansion is preferable to expanding the host package. Typical applications include industrial control panels, keypad and button interfaces, LED indication, appliance controls, instrumentation, and embedded systems requiring more GPIO than the host microcontroller provides. The 2.3V to 5.5V supply range supports both low-voltage and conventional 5V digital systems. The 24-pin SOIC package also makes the device suitable for through-hole assembly and conventional PCB layouts. When designing around the PCA9555, account for the I2C bus pull-up requirement, correct address selection, and the electrical limits of each output. The interrupt pin should be configured with an appropriate pull-up because it is open-drain and active low. Firmware should also define startup states and port directions before external circuitry becomes active. This page summarizes the verified device identity, package, operating range, interface features, and design implications available for PCA9555DWR selection. This information distinguishes the PCA9555DWR from generic 8-bit expanders by combining a 16-bit parallel interface, configurable weak pull-ups, polarity control, and interrupt support in a 2.3V to 5.5V SOIC device.

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PCA9555PW - 16-Bit I2C GPIO Expander | NXP Semiconductors
PCA9555PW

PCA9555PW - 16-Bit I2C GPIO Expander | NXP Semiconductors

The NXP Semiconductors PCA9555PW is a 24-pin CMOS I/O expander with 16 general-purpose parallel input/output ports for I2C-bus and SMBus systems, operating from 2.3 V to 5.5 V in a 24-pin TSSOP package. It adds 16 GPIO lines while minimizing interconnections, supports I2C/SMBus communication at up to 400 kHz according to the distributor listing, and includes interrupt capability for change detection. A GPIO expander is an interface IC that increases the number of digital input and output pins available to a host processor. The PCA9555 belongs to the I2C I/O-expander class, within interface ICs and the broader embedded-control semiconductor hierarchy. Each port bit can be configured independently for input or output, allowing control of LEDs, relays, logic levels, key inputs, and other digital peripherals through the serial bus instead of dedicating host-controller pins. The supplied product information identifies the device as a 16-bit I2C-bus/SMBus GPIO expander with interrupt support. Nexperia’s product information for the same PCA9555PW family specifies a wide 2.3 V to 5.5 V operating range and default GPIO pull-up resistors. The verified distributor results identify NXP’s PCA9555PW as an I/O expander in a 24-TSSOP package, while the UMW listing presents the same MPN as a 1 MHz I2C/SMBus variant; that listing is retained as market evidence but is not used to overwrite the target manufacturer specification. The device is useful when a controller has insufficient GPIO resources, especially in industrial controllers, embedded systems, sensors, and compact automation products. The serial interface reduces wiring complexity, while the interrupt output allows a host to respond to input changes without continuously polling the bus. GPIO electrical limits, address options, and detailed timing values were not supplied in the verified data and must be confirmed in the manufacturer datasheet before final design release. For robust PCB implementation, preserve the package footprint and pin numbering, confirm the intended I2C address, route the interrupt line away from fast switching nodes, and validate pull-up resistor values against the bus voltage and capacitance. Do not treat a distributor listing as a substitute for the NXP datasheet when selecting address strapping, power sequencing, or input thresholds.

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PCA9555PWR - 16-Bit I2C GPIO Expander | NXP Semiconductors (Tape & Reel)
PCA9555PWR

PCA9555PWR - 16-Bit I2C GPIO Expander | NXP Semiconductors (Tape & Reel)

The NXP Semiconductors PCA9555PWR is a 24-pin CMOS I/O expander with 16 general-purpose parallel input/output ports for I2C-bus and SMBus systems, operating from 2.3 V to 5.5 V in a 24-pin TSSOP package. It adds 16 GPIO lines while minimizing interconnections, supports I2C/SMBus communication at up to 400 kHz according to the distributor listing, and includes interrupt capability for change detection. A GPIO expander is an interface IC that increases the number of digital input and output pins available to a host processor. The PCA9555 belongs to the I2C I/O-expander class, within interface ICs and the broader embedded-control semiconductor hierarchy. Each port bit can be configured independently for input or output, allowing control of LEDs, relays, logic levels, key inputs, and other digital peripherals through the serial bus instead of dedicating host-controller pins. The supplied product information identifies the device as a 16-bit I2C-bus/SMBus GPIO expander with interrupt support. Nexperia’s product information for the same PCA9555PWR family specifies a wide 2.3 V to 5.5 V operating range and default GPIO pull-up resistors. The verified distributor results identify NXP’s PCA9555PWR as an I/O expander in a 24-TSSOP package, while the UMW listing presents the same MPN as a 1 MHz I2C/SMBus variant; that listing is retained as market evidence but is not used to overwrite the target manufacturer specification. The device is useful when a controller has insufficient GPIO resources, especially in industrial controllers, embedded systems, sensors, and compact automation products. The serial interface reduces wiring complexity, while the interrupt output allows a host to respond to input changes without continuously polling the bus. GPIO electrical limits, address options, and detailed timing values were not supplied in the verified data and must be confirmed in the manufacturer datasheet before final design release. For robust PCB implementation, preserve the package footprint and pin numbering, confirm the intended I2C address, route the interrupt line away from fast switching nodes, and validate pull-up resistor values against the bus voltage and capacitance. Do not treat a distributor listing as a substitute for the NXP datasheet when selecting address strapping, power sequencing, or input thresholds.

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PCA9557D - 8-Bit I2C/SMBus I/O Expander with Reset | TI (Tape & Reel)
PCA9557D

PCA9557D - 8-Bit I2C/SMBus I/O Expander with Reset | TI (Tape & Reel)

The Texas Instruments PCA9557D is an 8-bit I2C/SMBus I/O expander with configuration registers and a hardware reset input, operating from a 2.3 V to 5.5 V supply and packaged in a 16-pin SOIC (DR) footprint. The device provides general-purpose remote I/O expansion through the two-line bidirectional I2C bus (SCL and SDA) at speeds up to 400 kHz (Fast Mode). Each of the eight I/O pins can be independently configured as either an input or output, and the on-chip register set lets a host microcontroller read pin state and drive output latches over the same two-wire serial link. An I/O expander is a type of digital interface IC that sits on an I2C/SMBus and exposes additional GPIO to a host processor that has too few pins for its application. It belongs to the broader family of parallel-port expanders and, hierarchically, to peripheral ICs > interface ICs > digital logic ICs. Compared to a discrete shift-register approach, an I2C expander uses fewer host pins (only SCL and SDA), supports multi-drop addressing on the bus, and consumes very low standby current. Key features of the PCA9557D include 1 uA maximum standby current, 5 V tolerant I/O, hardware reset via the RESET pin, software reset through the I2C general-call address, and individually configurable I/O direction. The device supports up to eight slave addresses set by A0-A2 (within the PCA9557 family address space) so multiple expanders can share a single bus. An interrupt output (INT) signals the host when any input changes state, avoiding polling overhead. The PCA9557D uses a CMOS process with internal power-on reset and a low-impedance output structure capable of sourcing/sinking 10 mA per bit at 5 V, enabling direct LED drive in many cases. SMBus-alert and hardware-pin reset combine for robust multi-device control. According to the TI PCA9557 datasheet (SCPS155D-family), the device is pin-compatible with the PCA9554/PCA9534/PCF8574 series in 16-pin SOIC. Typical applications include server chassis management, industrial control panels, portable instrumentation, ACPI GPIO expansion on motherboards, keypad scanning, and LED driving on plug-in cards. Designers choose it when they need to expand a microcontroller's GPIO count over I2C while maintaining low standby power. When designing with this device, always include pull-up resistors on SCL, SDA, RESET, and INT per the I2C/SMBus specification (typically 2.2 k to 10 k depending on bus capacitance and speed). Decouple VCC with a 0.1 uF ceramic capacitor placed within 5 mm of the supply pin to suppress switching transients. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving buyers a one-stop comparison source.

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PCA9557DB - 8-Bit I2C I/O Expander | Texas Instruments
PCA9557DB

PCA9557DB - 8-Bit I2C I/O Expander | Texas Instruments

Texas Instruments PCA9557DB is an 8-bit I2C/SMBus low-power I/O expander with a 2.3 V to 5.5 V operating range, 400 kHz bus speed, and a 16-pin SSOP package. It provides eight remotely controlled general-purpose I/O lines and includes dedicated reset and configuration registers. The device is designed to extend the number of available digital inputs and outputs for embedded systems without requiring a parallel GPIO port on the host controller. An I/O expander is a type of interface IC that connects a serial bus to additional digital lines. The PCA9557DB belongs to the I2C/SMBus GPIO expander family, combining a serial interface controller, configuration registers, and eight quasi-bidirectional I/O ports. Its I2C and SMBus compatibility places it within the broader interface-IC and embedded-control hierarchy, where it can reduce the GPIO requirements of a microcontroller or processor. The PCA9557DB supports a 2.3 V to 5.5 V supply range, allowing use with both 3.3 V and 5 V systems. Its serial interface operates up to 400 kHz, while eight I/O pins provide flexible control of LEDs, logic inputs, or external interface signals. Dedicated configuration registers allow software to identify input or output direction, while the reset and configuration registers support deterministic peripheral initialization and bus management. The device communicates through serial clock and serial data lines, with address selection provided by hardware pins. The SSOP package is a compact surface-mount option, and the verified distributor information identifies the DB ordering variant as a 16-pin SSOP measuring approximately 0.209 inches, or 5.30 mm, in width. Because this is a general-purpose interface device rather than a power semiconductor, a safe operating area chart is not applicable. Typical uses include low-power MCU systems, industrial control modules, sensor-hub boards, LED indicators, and small embedded platforms requiring eight additional digital lines. The PCA9557DB is particularly useful when conserving controller pins is more important than high-speed parallel GPIO operation. Because the serial interface is shared with other bus devices, address configuration, pull-up requirements, and software initialization must be coordinated during board design. Designers should confirm the exact pin functions and electrical limits in the manufacturer datasheet before layout. Bus pull-ups, input thresholds, power sequencing, and the states of I/O pins during reset require careful review. Software should configure each port direction and initial output value before enabling the associated external circuitry to prevent unintended switching. This page consolidates verified manufacturer and distributor information, documents missing electrical parameters transparently, and identifies only same-package drop-in candidates supported by the supplied cross-reference evidence. It also adds application guidance and engineering checks that are not available from a distributor listing alone.

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PCA9557DBR - 8-Bit I2C I/O Expander | Texas Instruments
PCA9557DBR

PCA9557DBR - 8-Bit I2C I/O Expander | Texas Instruments

Texas Instruments PCA9557DBR is an 8-bit I2C and SMBus low-power I/O expander with reset and configuration registers, operating from 2.3 V to 5.5 V in a 16-pin SSOP package. It adds eight configurable digital I/O lines to a host controller while using only an I2C or SMBus interface for communication. The manufacturer describes the device as a remote expansion solution for systems whose external parallel I/O requirements exceed the available pins of the main controller. An I/O expander is an interface IC that extends the number of digital input or output lines available to a processor, microcontroller, or other bus master. Its place in the hardware hierarchy is I/O expander → interface controller → interface IC → semiconductor. The PCA9557DBR combines this bus interface with an 8-bit parallel port, making it useful for reducing package size, simplifying control wiring, and adding peripheral connections without requiring a larger host controller. Key features include eight remotely controlled I/O lines, a two-wire I2C/SMBus-compatible interface with a stated bus speed of 400 kHz, and dedicated reset and configuration registers. According to the Texas Instruments product page, the device supports 2.3 V to 5.5 V VCC operation. These characteristics allow the same expander to be used in low-voltage embedded systems as well as conventional 5 V industrial, consumer, and communications equipment without changing the interface arrangement. The device operates as a bus-addressed peripheral, with address and port behavior established through its configuration functions. Because its eight ports are controlled through a serial bus, software can read or change external logic levels without dedicating eight host GPIO pins. The reset function provides a defined initialization route for the expansion logic, while the configuration register supports controlled setup of the I/O behavior. Exact register addresses, polarity settings, and electrical limits should be confirmed in the manufacturer datasheet before firmware or PCB release. Typical uses include low-pin-count embedded controllers, industrial control modules, sensor and actuator interfaces, LED or switch input expansion, and communication equipment needing additional discrete digital lines. The PCA9557DBR is particularly useful where a design must retain a compact host package while adding an eight-bit parallel interface. Because the peripheral communicates over I2C or SMBus, it also avoids the larger routing burden associated with another direct host-to-I/O connection. When laying out a board, place the device close to the connector or controlled circuitry it serves, keep I2C routing short, and provide the required pull-up resistors on SCL and SDA. Account for the device address when multiple expanders share a bus, and use the reset input for a deterministic hardware startup path. Verify bus capacitance, pull-up resistance, voltage compatibility, and logic-level thresholds against the final system conditions. This page consolidates the verified manufacturer description, distributor availability and pricing references, package details, and practical implementation guidance. It also distinguishes confirmed replacement information from parameters that still require datasheet-level verification, helping engineers evaluate the PCA9557DBR without confusing electrically similar devices with verified drop-in choices.

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PCA9557DGVR - 8-Bit I2C I/O Expander | Texas Instruments
PCA9557DGVR

PCA9557DGVR - 8-Bit I2C I/O Expander | Texas Instruments

The Texas Instruments PCA9557DGVR is an 8-bit I2C and SMBus low-power I/O expander with reset and configuration registers, operating from 2.3 V to 5.5 V and supporting bus speeds up to 400 kHz. It is packaged in a 16-pin TVSOP and provides eight configurable quasi-bidirectional I/O lines through a two-wire serial interface. An I/O expander extends the number of digital input and output pins available to a host controller without adding a dedicated parallel-port bus. The I2C interface carries commands and data over two shared wires, while SMBus compatibility supports common embedded control architectures. This places the PCA9557 within the hierarchy of interface IC, bus expander, GPIO controller, and power-management-aware embedded peripheral. The PCA9557 combines eight independently configurable I/O ports, an active-low reset input, and dedicated configuration registers. Its low standby-current capability, rated at 1 µA maximum in the manufacturer datasheet, makes it suitable for systems that spend significant time in a reduced-power state. The 2.3 V to 5.5 V operating range covers common low-voltage logic systems and 5 V peripheral boards. The active-low RESET input allows a system controller to restore the power-on register state and initialize the I2C or SMBus state machine without removing power from the device. Configuration registers provide centralized control of the port behavior, while the eight ports can be individually programmed for input or output operation. The 400 kHz bus capability provides a practical balance between transfer throughput, wiring simplicity, and low system complexity. Typical uses include industrial control panels, programmable LED indicators, key scanners, sensor and relay interfaces, and compact embedded control boards. The PCA9557 is especially useful when the primary microcontroller or application processor has too few GPIO pins for switches, indicators, interlocks, or remote digital I/O. Design the PCB with short I2C traces, pull-up resistors on SDA and SCL, and a deliberate address assignment through the A0, A1, and A2 pins. Account for the active-low reset signal, validate output drive current for each connected load, and keep bus capacitance and voltage rise time within the limits stated in the manufacturer datasheet. This page combines the manufacturer's functional description, exact ordering information, package details, interface characteristics, and application-oriented engineering guidance. It also distinguishes verified drop-in alternatives from devices that require footprint or function review, helping engineers shorten sourcing and design-in work.

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PCA9557DR - 8-Bit I2C/SMBus I/O Expander with Reset | TI
PCA9557DR

PCA9557DR - 8-Bit I2C/SMBus I/O Expander with Reset | TI

The Texas Instruments PCA9557DR is an 8-bit I2C/SMBus I/O expander with configuration registers and a hardware reset input, operating from a 2.3 V to 5.5 V supply and packaged in a 16-pin SOIC (DR) footprint. The device provides general-purpose remote I/O expansion through the two-line bidirectional I2C bus (SCL and SDA) at speeds up to 400 kHz (Fast Mode). Each of the eight I/O pins can be independently configured as either an input or output, and the on-chip register set lets a host microcontroller read pin state and drive output latches over the same two-wire serial link. An I/O expander is a type of digital interface IC that sits on an I2C/SMBus and exposes additional GPIO to a host processor that has too few pins for its application. It belongs to the broader family of parallel-port expanders and, hierarchically, to peripheral ICs > interface ICs > digital logic ICs. Compared to a discrete shift-register approach, an I2C expander uses fewer host pins (only SCL and SDA), supports multi-drop addressing on the bus, and consumes very low standby current. Key features of the PCA9557DR include 1 uA maximum standby current, 5 V tolerant I/O, hardware reset via the RESET pin, software reset through the I2C general-call address, and individually configurable I/O direction. The device supports up to eight slave addresses set by A0-A2 (within the PCA9557 family address space) so multiple expanders can share a single bus. An interrupt output (INT) signals the host when any input changes state, avoiding polling overhead. The PCA9557DR uses a CMOS process with internal power-on reset and a low-impedance output structure capable of sourcing/sinking 10 mA per bit at 5 V, enabling direct LED drive in many cases. SMBus-alert and hardware-pin reset combine for robust multi-device control. According to the TI PCA9557 datasheet (SCPS155D-family), the device is pin-compatible with the PCA9554/PCA9534/PCF8574 series in 16-pin SOIC. Typical applications include server chassis management, industrial control panels, portable instrumentation, ACPI GPIO expansion on motherboards, keypad scanning, and LED driving on plug-in cards. Designers choose it when they need to expand a microcontroller's GPIO count over I2C while maintaining low standby power. When designing with this device, always include pull-up resistors on SCL, SDA, RESET, and INT per the I2C/SMBus specification (typically 2.2 k to 10 k depending on bus capacitance and speed). Decouple VCC with a 0.1 uF ceramic capacitor placed within 5 mm of the supply pin to suppress switching transients. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving buyers a one-stop comparison source.

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PCA9557DT - 8-Bit I2C I/O Expander | Texas Instruments
PCA9557DT

PCA9557DT - 8-Bit I2C I/O Expander | Texas Instruments

The Texas Instruments PCA9557DT is an 8-bit I2C and SMBus low-power I/O expander with reset and configuration registers, a 2.3 V to 5.5 V operating supply range, and a maximum bus clock frequency of 400 kHz. It is packaged as a 16-pin SOIC in the DT ordering configuration. The device expands one serial I2C interface into eight configurable parallel I/O lines, reducing microcontroller pin count and simplifying control of external digital functions. An I/O expander is an interface IC that translates serial commands from an I2C or SMBus controller into parallel digital inputs or outputs. The PCA9557 belongs to the broader embedded-interface hierarchy: I/O expander -> bus interface device -> interface IC -> semiconductor. It is useful when a system needs additional control or status lines without increasing the pin count of the main microcontroller, embedded processor, or programmable logic device. Key features include eight I/O ports, reset and configuration registers, support for both input and output operation, and low standby current consumption of 1 uA maximum according to the manufacturer data. The verified distributor listing identifies a 400 kHz I2C/SMBus interface and a 16-SOIC package. The PCA9557DT is intended for designs requiring a compact, serial-to-parallel expansion function, although exact pin names, electrical limits, and register behavior should be confirmed in the manufacturer datasheet before layout or firmware implementation. The device is used as an I2C target and communicates with a host controller through addressable registers. A host can configure port direction and then read or write port state, subject to the register definitions and electrical limits in the datasheet. Because I2C bus capacitance, pull-up resistance, address configuration, and peripheral power sequencing affect reliability, the device should be placed with short traces away from noisy switching stages. Typical applications include industrial control modules, sensor and actuator interfaces, programmable digital I/O, instrumentation, embedded control boards, and systems that need eight additional lines without expanding the host controller. The device can also complement a microcontroller such as an STM32H750VBT6TR when its direct GPIO budget is reserved for higher-speed or interrupt-sensitive functions. When selecting a replacement, verify the SOIC-16 footprint, pin mapping, I2C address behavior, reset requirements, output-drive limits, supply range, and register compatibility. PCA9557D is a relevant same-family ordering option, but package suffix and availability must be checked against the manufacturer’s ordering information. This page consolidates manufacturer and distributor sources, identifies the verified operating envelope, and provides practical design guidance for I2C bus design, decoupling, pull-ups, and lifecycle planning. It is intended to support component selection before the complete manufacturer datasheet is used for final electrical and production qualification.

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PCA9557PW - 8-Bit I2C I/O Expander | NXP | 16-TSSOP
PCA9557PW

PCA9557PW - 8-Bit I2C I/O Expander | NXP | 16-TSSOP

The NXP Semiconductors PCA9557PW is an 8-bit I2C/SMBus parallel input/output expander operating from 2.3 V to 5.5 V, with a 400 kHz bus rate and a 16-pin TSSOP package. It combines an 8-bit input port register, an 8-bit output port register, and an I2C/SMBus interface, allowing a microcontroller to control or monitor eight additional digital lines. The device also provides low current consumption and a high-impedance open-drain output on IO0. An I/O expander is an interface IC that extends the number of general-purpose inputs and outputs available to a host processor. The PCA9557 belongs to the parallel I/O expander class, connects to the I2C/SMBus hierarchy, and reduces the number of host-controller pins needed for buttons, indicators, relays, logic controls, and other digital peripherals. Its operating voltage range supports both 3.3 V and 5 V system contexts where the host and external signals use compatible logic levels. The verified product information identifies an 8-bit I/O expander, a 400 kHz I2C/SMBus interface, a 2.3 V to 5.5 V VCC range, and a 16-TSSOP package. The controller can configure the port direction and access the input and output registers through the serial bus. IO0 is specifically described as a high-impedance open-drain output, while the remaining port behavior and electrical limits should be confirmed in the manufacturer datasheet before final design release. Typical applications include low-pin-count embedded control, keypad and switch input consolidation, LED or indicator control, relay-interface logic, sensor-gate control, and general industrial or consumer equipment requiring eight remote digital lines. The I2C interface makes the PCA9557 especially useful when the host has limited spare pins but can provide an I2C bus. Firmware must define the device address, register behavior, port direction, pull-up requirements, and any open-drain load arrangement. For PCB implementation, place the device close to the connector or controlled signal group, route SDA and SCL as a short bus pair, and provide pull-up resistors only after checking the bus voltage, capacitance, speed, and number of devices. Do not assume that a mechanically similar 16-TSSOP part is pin-compatible: compare address, register map, pin functions, electrical limits, and I/O behavior against the manufacturer datasheet. This page consolidates the verified NXP product identity, package and bus information, practical application context, and the need for datasheet-level validation. It distinguishes confirmed facts from parameters that require a specific datasheet revision or device variant before being used in a production design.

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PCA9557PWR - 8-Bit I2C I/O Expander | NXP | 16-TSSOP (Tape & Reel)
PCA9557PWR

PCA9557PWR - 8-Bit I2C I/O Expander | NXP | 16-TSSOP (Tape & Reel)

The NXP Semiconductors PCA9557PWR is an 8-bit I2C/SMBus parallel input/output expander operating from 2.3 V to 5.5 V, with a 400 kHz bus rate and a 16-pin TSSOP package. It combines an 8-bit input port register, an 8-bit output port register, and an I2C/SMBus interface, allowing a microcontroller to control or monitor eight additional digital lines. The device also provides low current consumption and a high-impedance open-drain output on IO0. An I/O expander is an interface IC that extends the number of general-purpose inputs and outputs available to a host processor. The PCA9557 belongs to the parallel I/O expander class, connects to the I2C/SMBus hierarchy, and reduces the number of host-controller pins needed for buttons, indicators, relays, logic controls, and other digital peripherals. Its operating voltage range supports both 3.3 V and 5 V system contexts where the host and external signals use compatible logic levels. The verified product information identifies an 8-bit I/O expander, a 400 kHz I2C/SMBus interface, a 2.3 V to 5.5 V VCC range, and a 16-TSSOP package. The controller can configure the port direction and access the input and output registers through the serial bus. IO0 is specifically described as a high-impedance open-drain output, while the remaining port behavior and electrical limits should be confirmed in the manufacturer datasheet before final design release. Typical applications include low-pin-count embedded control, keypad and switch input consolidation, LED or indicator control, relay-interface logic, sensor-gate control, and general industrial or consumer equipment requiring eight remote digital lines. The I2C interface makes the PCA9557 especially useful when the host has limited spare pins but can provide an I2C bus. Firmware must define the device address, register behavior, port direction, pull-up requirements, and any open-drain load arrangement. For PCB implementation, place the device close to the connector or controlled signal group, route SDA and SCL as a short bus pair, and provide pull-up resistors only after checking the bus voltage, capacitance, speed, and number of devices. Do not assume that a mechanically similar 16-TSSOP part is pin-compatible: compare address, register map, pin functions, electrical limits, and I/O behavior against the manufacturer datasheet. This page consolidates the verified NXP product identity, package and bus information, practical application context, and the need for datasheet-level validation. It distinguishes confirmed facts from parameters that require a specific datasheet revision or device variant before being used in a production design.

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PCA9570GMH - 4-Bit I2C GPO Expander | NXP | XQFN-8
PCA9570GMH

PCA9570GMH - 4-Bit I2C GPO Expander | NXP | XQFN-8

NXP PCA9570GMH is a 4-bit general-purpose output expander that adds push-pull digital outputs to a host processor through an I2C-bus interface. It supports bus speeds up to 1 MHz while maintaining backward compatibility with Fast-mode at 400 kHz and Standard-mode at 100 kHz. The device is supplied in an 8-pin XQFN package measuring 1.6 mm by 1.6 mm and includes an exposed thermal pad according to the distributor listing. An I2C output expander is a semiconductor interface device that converts a serial two-wire bus into additional parallel control outputs. In the product hierarchy, the PCA9570GMH belongs to the I/O expander class, within interface ICs and logic ICs. Unlike a general-purpose input/output expander, the PCA9570 is a streamlined GPO device whose four outputs are configured as push-pull drivers. This makes it suitable for controlling loads that require a driven logic level rather than a high-impedance input. Key features include four general-purpose parallel outputs, 1 MHz I2C-bus operation, and compatibility with both 100 kHz and 400 kHz bus standards. The low-voltage CMOS construction targets processor-based and handheld battery-powered equipment. The small XQFN-8 footprint helps reduce board area when a controller has too few output pins for relays, indicators, logic enables, or other digital loads. The PCA9570GMH is a streamlined output-only expander, so its register and pin arrangement should be compared carefully with mixed input/output or bidirectional expanders before substitution. Its four push-pull outputs provide defined high and low states, making the device appropriate for simple control signals in consumer electronics, mobile accessories, battery-powered instruments, and compact embedded systems. In a typical design, the host connects SDA and SCL to the PCA9570GMH, writes the desired output pattern to the device register, and reads back the output states. The bus lines require pull-up resistors in accordance with the I2C specification. Because the package exposes a pad, the PCB layout should maximize copper area under the exposed pad to improve heat spreading. For power-sensitive designs, the quiescent current and output-driver loading should be checked against the system battery budget. Because every host controller needs a reliable I2C pull-up arrangement, verify the bus capacitance, pull-up resistance, and level-shifting requirements before layout release. Use the pin-connection and register details in the manufacturer datasheet when assigning PCB tracks.

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PCA9571GUX - 8-Bit 1MHz I2C Output Expander | NXP
PCA9571GUX

PCA9571GUX - 8-Bit 1MHz I2C Output Expander | NXP

NXP Semiconductors PCA9571GUX is an 8-bit general-purpose parallel output expander for low-voltage processor and handheld applications, with I2C communication up to 1 MHz and a 12-pin XQFN package measuring 2 mm by 1.7 mm. The device operates in Standard-mode at 100 kHz, Fast-mode at 400 kHz, and 1 MHz modes on a lightly loaded bus with less than 100 pF capacitance. An I2C output expander is an interface IC that adds parallel digital outputs to a serial bus. The hierarchy runs from I2C output expander to GPIO expander, interface expander, and semiconductor. It is useful when a processor has too few general-purpose output pins to control multiple discrete loads while the system architecture requires a shared serial control bus. The PCA9571GUX provides eight general-purpose parallel outputs and supports 1 MHz I2C operation while retaining backward compatibility with 100 kHz Standard-mode and 400 kHz Fast-mode buses. Backward compatibility allows the same device to operate alongside slower peripherals on a shared bus, although total bus capacitance, pull-up selection, and signal-integrity margin remain system-level constraints. The streamlined output-only architecture distinguishes this device from bidirectional I/O expanders. It does not provide input pins for state readback, so its primary function is command and control rather than monitoring external logic levels. The 2 mm by 1.7 mm XQFN package supports compact designs where board area is important, although the fine-pitch footprint requires careful PCB assembly and inspection. Typical applications include portable-device control, low-voltage processor systems, battery-powered equipment, and systems that need multiple parallel outputs driven over I2C. Product family members can be useful in portable and mobile equipment, industrial controllers, embedded systems, and peripheral-control designs where eight outputs reduce the number of direct host-controller connections. Designers should confirm the address configuration, output behavior, voltage limits, and pin mapping in the manufacturer datasheet before finalizing a PCB. The 1 MHz operating rate is intended for a lightly loaded bus below 100 pF; pull-up resistance, cable length, peripheral capacitance, and signal rise time must be evaluated together when the bus includes long traces or additional devices. This page organizes the PCA9571GUX function, interface characteristics, package constraints, application guidance, comparison points, and replacement criteria so that engineers can assess the device alongside other I2C output-expansion options before committing a board layout.

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PCA9600D,118 - 1 MHz I2C-bus Buffer/ReDriver | NXP | 8-SO
PCA9600D,118

PCA9600D,118 - 1 MHz I2C-bus Buffer/ReDriver | NXP | 8-SO

The NXP PCA9600D,118 is a dual bidirectional bus buffer/ReDriver designed to isolate I²C-bus capacitance in point-to-point and multipoint applications up to 4000 pF. Housed in an 8-pin SO (SOIC-8) package, it operates at speeds up to at least 1 MHz and provides a non-latching, bidirectional logic interface between a standard I²C-bus and higher-capacitance or different-voltage bus segments. The high-drive side is compatible with the Fast-mode Plus (Fm+) specification, making the PCA9600 a higher-speed upgrade to the legacy P82B96. What is an I²C bus buffer? An I²C-bus buffer/ReDriver is a dedicated interface IC that sits between two bus segments to overcome the 400 pF capacitive limit of standard I²C. By isolating capacitance, a buffer allows engineers to extend bus length, add more nodes, use lower-cost cabling, or bridge between logic-voltage domains. Buffers/ReDrivers belong to the interface IC hierarchy: interface IC > bus buffer > I²C extender > signal conditioning, and are widely used in industrial backplanes, sensor arrays, and LED lighting chains where long cable runs would otherwise exceed the bus's RC budget. Key features of the PCA9600 include an operating supply voltage range from 2.5 V to 15 V on the low-voltage (standard I²C) side, with logic-level translation capability through the dual-rail architecture. The part is specified for -40 °C to +85 °C operation and offers high-impedance logic pins that prevent bus latching during plug-in or brown-out events. The device is bus-isolating rather than bus-repeating, so it cannot sink the I²C pull-up current from both sides simultaneously—designers must provide pull-ups on each side. Architecturally, the PCA9600 uses an internal pass-FET-style transmission gate with direction-sense amplifiers that detect which side is driving and steer current accordingly without requiring an external direction-control pin. The result is a drop-in, transparent bus extender that does not occupy an I²C address and does not appear as a node. Compared to discrete MOSFET plus pull-up solutions, the PCA9600 guarantees matched thresholds, controlled rise/fall times, and known hot-swap behavior across temperature. Common applications include industrial control backplanes, large-display LED driver chains, remote sensor arrays, and any system where the I²C master sits on one PCB and the slaves are several meters away on a cable or harness. The PCA9600D,118 ships on 13-inch tape and reel and is fully RoHS compliant, targeting high-reliability commercial and industrial designs. When designing with this part, pay close attention to the pull-up placement: each bus segment requires its own pull-up resistor sized for that segment's capacitance and the target rise time. Designers commonly pair the PCA9600 with 4.7 kΩ pull-ups on the master side and 1 kΩ to 2.2 kΩ pull-ups on the high-drive side to handle the larger bus capacitance.

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PCA9601D,118 - 1MHz Fm+ I2C Bus Buffer SO-8 | NXP
PCA9601D118

PCA9601D,118 - 1MHz Fm+ I2C Bus Buffer SO-8 | NXP

The NXP PCA9601D,118 is a dual bidirectional I2C-bus buffer and repeater supporting operation to at least 1 MHz (Fast-mode Plus), with a wide 2.5 V to 15 V supply range, up to 4000 pF bus capacitance drive capability, and an 8-pin SO (SOIC-8) surface-mount package. An I2C-bus buffer is a specialized interface IC inserted between a controller-side I2C bus and one or more remote bus segments. Because the standard I2C bus is limited by total capacitance (typically 400 pF) and by the driving strength of the master device, long cables, backplanes, and daughter-card architectures quickly exceed these limits. A buffer isolates the capacitance of each bus segment, regenerates the signal edges, and allows each side to use a different supply voltage, making it a key building block within the interface IC and bus repeater/redriver family. Key features of the PCA9601 include bidirectional, non-latching signal transfer in both directions, compatibility with Fast-mode Plus (Fm+) drive requirements on the high-drive B-side, and voltage-domain separation so a 3.3 V controller bus can drive a 5 V, 12 V, or 15 V remote bus. According to NXP, the part isolates I2C-bus capacitance and permits point-to-point or multipoint buses of up to 4000 pF. Technically, the device implements an open-drain bidirectional buffer using NXP's proprietary level-shifting buffer architecture derived from the P82B96 family. It is a higher-speed version of the P82B96 and a higher-drive version of the PCA9600, meaning more Fm+ targets can hang on remote bus segments without timing violations. The 50 ns propagation delay class and 1 MHz capability keep rise/fall budgets intact at Fm+ speeds. Typical applications include long I2C runs in industrial backplanes, LED display panels, battery management systems, and remote daughter cards carrying many I2C targets where capacitance and drive strength would otherwise limit the bus. Design consideration: place the buffer close to the controller-side connector and size pull-up resistors separately for each bus segment, because the two sides have different drive strengths and voltage levels. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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PCA9601DPZ - 1MHz Dual I2C-Bus Buffer | NXP Semiconductors
PCA9601DPZ

PCA9601DPZ - 1MHz Dual I2C-Bus Buffer | NXP Semiconductors

The NXP Semiconductors PCA9601DPZ is a dual bidirectional I2C-bus buffer and repeater that isolates bus capacitance and drives loads up to 4000 pF, operating at speeds up to 1 MHz (Fast-mode Plus) in an 8-pin TSSOP surface-mount package. An I2C-bus buffer is a type of interface IC that sits between a standard I2C master/target segment and a long or heavily loaded bus segment. In the interface IC hierarchy (bus buffer -> signal repeater -> interface IC), its role is to regenerate signal edges and isolate capacitance, because the I2C specification limits total bus capacitance and rising-edge time. By splitting one bus into short segments, a buffer allows long cables, backplanes, and daughter-card interconnects that would otherwise violate I2C timing. Key features of the PCA9601 include 4000 pF bus drive capability, non-latching bidirectional logic that preserves the wired-AND I2C arbitration and clock-stretching behavior, and a high-drive side compatible with Fast-mode Plus (Fm+) specifications. It supports level translation between mixed-voltage bus segments (3.3V, 5V, and higher-voltage buffered sides), enabling communication between 3.3V and 5V systems while maintaining signal integrity and timing. The PCA9601 is architecturally a higher-speed version of the well-established P82B96 and a higher-drive version of the PCA9600. Its buffered, non-latching topology means the buffer never locks up during arbitration or repeated starts, a common failure mode of simpler repeater designs. The high drive strength allows many more Fast-mode Plus targets on remote daughter cards than an unbuffered bus could support. Typical applications include point-to-point and multipoint extension of I2C buses across cables and backplanes, isolating capacitance of remote daughter cards, mixed-voltage (3.3V/5V) system interfacing, and industrial or telecom equipment where many Fm+ targets must share a long bus. Devices such as the PCA8574, PCA9539, and PCA9538 I/O expanders are typical loads at the far end of a buffered segment. Design considerations: the PCA9601 specifies an operating temperature range of 0 C to 85 C, so it is intended for commercial and industrial indoor use rather than automotive-grade environments. Verify bus segment capacitance on both sides and follow the datasheet for pull-up sizing on the buffered side to meet Fm+ rise-time requirements. This page synthesizes distributor pricing context, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet, with data verified as of 2026-10-20.

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PCA9614DP,118 - 2-Ch Fm+ Differential I2C Bus Buffer | NXP
PCA9614DP,118

PCA9614DP,118 - 2-Ch Fm+ Differential I2C Bus Buffer | NXP

The NXP PCA9614DP,118 is a 2-channel multipoint Fast-mode Plus (Fm+) differential I2C-bus buffer with 400 kHz buffered operation, dual-supply differential signaling, and a 10-pin TSSOP (DP) surface-mount package. It extends a normal single-ended SMBus/I2C-bus across electrically noisy environments using a differential I2C (dI2C) physical layer that is fully transparent to the SMBus/I2C-bus protocol layer. An I2C-bus buffer and repeater is an interface IC that regenerates and drives bus signals, increasing fan-out, breaking capacitance limits, and lengthening bus reach. Within the interface IC hierarchy, buffer ICs sit between an I2C master/peripheral and the physical wire, and differential buffers such as this one add a robust physical layer without changing the protocol, so standard controllers require no firmware changes. Key features include two independent buffer channels supporting multipoint dI2C links over long cables, an EN pin that places the device in an idle state to stop traffic propagation, and an internal pull-up on EN that holds the device enabled by default. The differential transmission rejects common-mode noise, making the link tolerant of ground potential differences between boards. Technically, the PCA9614 converts the single-ended SDA/SCL levels into a differential pair per channel at the buffer output side, and converts back to single-ended at the receiving end when paired with another differential buffer. Because the dI2C layer is protocol-transparent, arbitration, clock stretching, and Fm+ 400 kHz (1 MHz capable) timing behave exactly as on a standard bus, while cable capacitance and noise immunity requirements are decoupled from the bus segment. Typical applications include industrial automation bus extension, rack and backplane inter-board communication in servers, battery management systems in electrically noisy traction environments, and long-run I2C links between enclosures or display modules. A key design consideration is power sequencing of the dual supplies (VDD(A) on the single-ended side and VDD(B)/VL on the differential side); both must remain within the datasheet recommended operating conditions and EN should be held low during startup to prevent glitching. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, with freshness data as of 2026-10-20.

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