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ISL33001IUZ - I2C Bus Buffer, Hot-Swap 2-Ch | Renesas
The Renesas Electronics ISL33001IUZ is a 2-channel I2C bus buffer with rise-time accelerators and hot-swap capability, extending I2C bus capacitance beyond the 400 pF limit specified by the I2C specification, supplied in an 8-pin MSOP (IUZ) package rated for the industrial -40C to +85C temperature range. An I2C bus buffer (also called a bus repeater or signal buffer) is an interface IC that sits between an I2C controller segment and a heavily loaded peripheral segment. The I2C specification limits total bus capacitance to 400 pF, which restricts the number of devices, trace length, and pull-up resistance a system can support. A bus buffer regenerates the SDA and SCL edges, segmenting the bus so each side only sees its own local capacitance, allowing much larger backplanes, card cages, and cable runs. Key features of the ISL33001 include two independent buffered channels (SDA and SCL), rise-time accelerator circuitry that drives rising edges actively to reduce power dissipated in passive pull-up resistors and enable faster data rates, and integrated hot-swap circuitry that prevents SDA/SCL corruption when a board is inserted into or removed from a live backplane. The device supports standard and fast-mode I2C operation with level-tolerant I/O structure. Architecturally, the buffer uses a dual-direction translator between the controller-side and card-side pins: a low level on either side propagates to the other, while levels are re-driven with controlled rise times. This bidirectional, transparent behavior requires no mode control in typical single-controller systems. The hot-swap input stage holds the local bus pins low or high-impedance during power ramp until VCC stabilizes, avoiding spurious start or stop conditions during card insertion. Typical applications include server and telecom backplanes, I2C fan controllers, optical-module management (SFP/QSFP style management buses), battery-management and hot-pluggable card rails, and long cable runs between chassis in industrial systems. Design consideration: rise-time accelerators pull up only during edges; ensure adequate static pull-up resistance on the far side of the buffer for DC low-level sinks, and keep the EN/enable pin controlled during power sequencing to avoid bus glitches. This page synthesizes distributor pricing, drop-in family alternatives (ISL33002/ISL33003), and practical design notes not found in the manufacturer datasheet.
PCA9544ARGYR - 4-Ch I2C/SMBus Multiplexer | TI
The Texas Instruments PCA9544ARGYR is a 4-channel I2C and SMBus multiplexer with interrupt logic, operating from a 2.3V to 5.5V supply and housed in a 20-pin VQFN (RGY) package measuring 3.5 x 4.5 mm. It provides 1-of-4 bidirectional translating switches and is rated from -40C to +85C. An I2C multiplexer is an interface IC that lets a single master bus control multiple downstream I2C buses, resolving address conflicts between identical slave devices and isolating capacitive loading on long or heavily populated bus segments. Within the signal-chain hierarchy, the PCA9544A sits in the I2C switch family of interface ICs, bridging bus management and voltage-level translation in system control architectures. Key features include four active-low interrupt inputs with a single active-low open-drain interrupt output, three hardware address pins (A0, A1, A2) allowing up to eight PCA9544A devices on one I2C bus, and voltage translation so buses on either side can operate at different logic levels. Channel selection is performed entirely via the I2C bus through an internal control register, and the device includes a power-on reset that deselects all channels at startup. Architecturally, the PCA9544A passes gate signals bidirectionally without direction control, so any downstream device can also act as a master. The pass-gate translation structure means the device does not latch up when one side is powered while the other side is not, an important behavior in multi-rail systems. Typical applications include server and storage backplane sensor aggregation, battery-management and power-supply I2C fan-out, and any design where two devices share the same I2C address or where bus capacitance must be partitioned. Design consideration: because the pass-gate adds series resistance, verify total bus capacitance and pull-up sizing on long segments to keep rise times within the I2C specification. This page synthesizes distributor pricing, drop-in alternatives, pinout data, and practical design notes not found in the manufacturer datasheet.
PCA9545ADGVRG4 - 4-Ch I2C/SMBus Mux, 20-TVSOP | Texas Instruments
The Texas Instruments PCA9545ADGVRG4 is a quad bidirectional translating I2C and SMBus multiplexer/switch with interrupt logic and reset functions, housed in a 20-pin TVSOP (DGV) package with 0.4 mm pitch and 4.4 mm body width. It operates from a 2.5 V nominal supply and passes voltages up to 2.5 V with all I/O pins rated 5.5 V tolerant, enabling 1.8 V to 5 V bus-domain isolation in mixed-voltage systems. An I2C multiplexer is a form of bus switch IC within the broader interface IC family. It sits between a master controller and multiple I2C segments, allowing one SDA/SCL pair to be time-multiplexed onto up to four downstream channels. This solves address conflicts between identical slave devices, reduces bus capacitance, and isolates fault domains such as a shorted downstream device. Key features include four selectable bidirectional channels controlled by a 2-wire register write, hardware reset (/RESET) that recovers a hung downstream bus without a full system power cycle, and four open-drain interrupt inputs (/INT0-/INT3) that are logically OR-ed onto a single master interrupt line. Passive pull-up compatible operation means no external level translation is required for pass-gate switching. The pass-gate (transmission-gate) architecture makes the switch bidirectional and voltage-translating: the downstream voltage level is determined by VCC and the pass-gate limiting. Propagation delay through the switch is minimal because data is not buffered or re-timed, preserving I2C multi-master arbitration and clock stretching behavior across all channels. Typical applications include server and telecom chassis management (multiple FRU EEPROMs and sensors on isolated segments), automotive body modules, and any system where I2C address space is exhausted or a hung slave must be quarantined. Design tip: always connect /RESET to a supervisor or host GPIO - it is the fastest recovery path when a slave holds SDA low. Keep total downstream bus capacitance within I2C limits per selected channel. This page synthesizes distributor pricing, drop-in alternatives, pinout, and practical design notes not consolidated in the manufacturer datasheet.
PCA9546AD,112 - 4-Ch I2C Switch with Reset | NXP
The NXP PCA9546AD,112 is a quad bidirectional translating I2C-bus switch with an active-LOW reset input, operating from a 2.3 V to 5.5 V supply, with a maximum on-state switch resistance of 30 ohm, housed in a 16-pin SOIC (0.154 in / 3.90 mm width) package supplied in tube packaging. An I2C multiplexer switch is an interface IC that lets a single I2C or SMBus master share one upstream SCL/SDA pair among several downstream bus segments. Within the interface IC hierarchy (bus switch -> I2C multiplexer -> I2C/SMBus interface IC), these devices resolve address conflicts, isolate capacitive loading, and allow voltage-level translation between mixed-voltage buses such as 1.8 V, 2.5 V, 3.3 V and 5 V rails. Key features include 1-of-4 bidirectional translating switches, SMBus-standard-compatible I2C logic, three hardware address pins (A0-A2) that allow up to eight PCA9546A devices on one bus, channel selection in any combination via the programmable control register, and power-up with all channels deselected. The low Ron pass switches preserve signal integrity at standard and fast I2C speeds. The architecture fans the upstream SCL/SDA pair out to four downstream SCx/SDx pairs using transmission-gate switches. The active-LOW RESET input lets the system recover from a hung bus segment by restoring the power-up default (all channels deselected) without a full power cycle, an important fault-recovery feature in electrically noisy environments. Typical applications include server and telecom shelf management (SMBus fan and sensor muxing), LCD/LED display panel I2C fan-out, isolating multiple EEPROM or sensor clusters with clashing addresses, and level shifting between 3.3 V and 5 V I2C domains. Design consideration: budget the roughly 30 ohm switch resistance plus bus capacitance in your rise-time calculations; heavily loaded downstream segments may need reduced pull-up values or bus buffers. This page synthesizes distributor pricing context, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
PCA9617ATPZ - Fm+ I2C Level Translating Repeater | NXP
The NXP Semiconductors PCA9617ATPZ is a level translating Fast-mode Plus (Fm+) I2C-bus repeater that provides bidirectional level shifting between a low-voltage side (0.8 V to 5.5 V) and a higher-voltage side (2.2 V to 5.5 V), housed in an 8-pin HWSON (2x3 mm) package with a 1 MHz data rate and 76 ns propagation delay. An I2C-bus repeater (also called a buffer or bus extender) is an interface IC that sits between a controller and peripheral segments of an I2C or SMBus serial bus. Its role in the system hierarchy is: I2C repeater -> I2C buffer -> serial interface IC -> interface IC -> integrated circuit. It divides capacitively loaded bus segments, extends total bus length, and translates between devices operating at different supply voltages while retaining all operating modes of the I2C-bus system. Key features of the PCA9617A include support for Fast-mode Plus operation up to 1 MHz, which is backward compatible with Standard-mode (100 kHz) and Fast-mode (400 kHz) devices; a wide low-side supply range of 0.8 V to 5.5 V enabling translation from 1.0 V, 1.2 V, 1.8 V, 2.5 V and 3.3 V logic rails up to 2.2 V to 5.5 V rails; and an enable (EN) pin that isolates both sides when the bus is idle or during system power-up. The CMOS architecture provides bidirectional buffering for both SDA and SCL without direction-control pins. Technically, the device uses open-drain MOSFET switches with rise-time accelerators on each side, so both bus segments are individually pulled up and capacitance is not summed across the repeater. Propagation delay is 76 ns, leaving ample timing margin at 1 MHz Fm+ rates. This makes the part suitable for bus segments with heavy capacitive loading that would otherwise violate I2C rise-time specifications. Typical applications include level shifting between low-voltage microcontrollers and 3.3 V or 5 V sensor or EEPROM buses, extending I2C bus length in industrial control backplanes, and isolating heavily loaded SMBA/SMBus segments in server and telecom hardware. Design consideration: because the repeater locks up under certain clock-stretching patterns, verify that your slave devices do not hold SCL low for longer than the repeater's support interval; consult the manufacturer datasheet application section before deploying with clock-stretching peripherals. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
SN74AVC4T245QWRGYRQ1 - 4-Bit Dual-Supply Level Shifter AEC-Q100 | TI
The Texas Instruments SN74AVC4T245QWRGYRQ1 is an automotive-grade, 4-bit dual-supply bus transceiver with configurable voltage-level translation and 3-state outputs, packaged in a compact 16-pin VQFN (RGY, 4x3.5 mm) footprint. It enables bidirectional level shifting between buses operating at different supply voltages and is AEC-Q100 qualified for automotive use. A bus transceiver is a digital interface IC that combines transmit and receive paths in one device, allowing bidirectional data flow between two buses. The SN74AVC4T245-Q1 belongs to the voltage-level translator family, a subset of interface ICs within the broader integrated circuits category. Level translation is essential when connecting components with different I/O voltages, such as a 1.8 V microcontroller interfacing with a 3.3 V peripheral. Key features include dual-supply operation with VCCA and VCCB each accepting 1.2 V to 3.6 V, tri-state outputs for bus isolation, and Ioff partial-power-down protection that disables outputs and prevents damaging backflow current when either supply is removed. A typical propagation delay of 2.1 ns and data rates up to 380 Mbps make the device suitable for SPI, I2C, UART, and parallel GPIO interfaces. The CMOS architecture supports use as two independent 2-bit transceivers or one 4-bit transceiver. Direction control (1DIR, 2DIR) and output-enable (1OE, 2OE) pins are referenced to VCCA, simplifying control-logic design in mixed-voltage systems. The device operates asynchronously, requiring no clock signal, and is fully specified over the -40C to +125C automotive temperature range. Typical applications include automotive body control modules, ADAS ECUs, infotainment systems, and industrial automation. In ECUs, it bridges 1.8 V or 2.5 V MCUs to 3.3 V sensors, CAN transceiver interfaces, SPI flash, and general-purpose GPIO level shifting. Site-available companions include the SN65HVD230QDRQ1 CAN transceiver and SN74LVC1T45QDCKRQ1 single-bit translator. Design tip: decouple VCCA and VCCB with 0.1 uF capacitors placed close to the pins, and ensure DIR/OE signals (VCCA domain) are stable before data transmission to avoid bus contention.
TXB0104QRUTRQ1 - 4-Bit Auto-Direction Level Translator | TI
The Texas Instruments TXB0104QRUTRQ1 is an automotive-qualified 4-bit bidirectional voltage-level translator with automatic direction sensing, delivered in a compact 12-pin UQFN (RUT) package measuring 1.7 mm x 2.0 mm. It translates between a 1.2 V to 3.6 V A-port supply and a 1.65 V to 5.5 V B-port supply (VCCA <= VCCB), supporting data rates up to 100 Mbps. A voltage-level translator is a logic device that interfaces digital circuits operating at different supply voltages on the same PCB, such as a 1.8 V microcontroller talking to a 3.3 V or 5 V peripheral. translators sit within the broader logic IC hierarchy as members of the voltage-translation and signal-conditioning family used in mixed-voltage embedded systems. Key features include AEC-Q100 Grade 1 qualification (-40C to +125C ambient), +/-15kV IEC ESD protection on the I/O pins, and automatic direction sensing that eliminates direction-control pins or firmware overhead. The TXB family push-pull architecture uses internal one-shot edge accelerators, giving rise and fall symmetry suited to push-pull CMOS outputs. The 12-UQFN package enables very dense layouts in space-constrained automotive modules. Typical applications include automotive body electronics and lighting, infotainment and cluster SPI/I2C-adjacent push-pull signaling, sensor interface level shifting, and general-purpose MCU-to-peripheral level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V domains. The wide 1.2 V low-side support makes it suitable for next-generation low-voltage processors. Design note: this device is intended for push-pull CMOS signals; for open-drain buses such as I2C, choose the TXS family instead. Do not add external pull-up or pull-down resistors on TXB I/O lines, as they can defeat the automatic direction sensing.