PCA9641PWJ

Signal Buffers, Repeaters, Splitters Overview

The PCA9641PWJ is a 2-to-1 bidirectional I2C master arbiter manufactured by NXP Semiconductors. It operates within an operating power supply voltage range of 2.3 V to 3.6 V and supports clock frequencies up to 1 MHz. The device features active LOW interrupt outputs, an active LOW reset input, and software reset capabilities. It includes four address pins allowing for up to 112 different addresses. The component provides arbitration when two masters attempt simultaneous access, bus time-out after 100 ms on an inactive downstream bus, and readable device ID information. All I/O pins are 3.6 V tolerant.

Signal Buffers, Repeaters, Splitters Feature Summary

• Arbitration function selects a winning master during simultaneous access attempts
• Voltage level translation between 1.8 V, 2.3 V, 2.5 V, 3.3 V, and 3.6 V buses
• Bus initialization and recovery function for slave devices without hardware reset

Signal Buffers, Repeaters, Splitters Applications

• High reliability systems with dual masters
• Gatekeeper multiplexer on long single bus
• Allows masters without arbitration logic to share resources

Signal Buffers, Repeaters, Splitters Procurement Notes

Verify the specific package type TSSOP16 and ordering suffix PWJ against the manufacturer's current product data sheet. Confirm that the ambient temperature range matches the required application environment of -40 °C to +85 °C. Ensure compatibility with the system's I2C/SMBus standards before finalizing procurement.

Signal Buffers, Repeaters, Splitters Selection Notes

Select this component for applications requiring high-reliability dual master I2C-bus architectures. Ensure the design accounts for external pull-up resistors as internal ones are not incorporated. Consider the voltage translation requirements if mixing bus voltages such as 1.8 V or 2.5 V with 3.3 V systems.

Signal Buffers, Repeaters, Splitters Part Context

The PCA9641 series includes variants like PCA9641BS in HVQFN16 and PCA9641PW in TSSOP16 packages. The PCA9641PWJ specifically denotes the TSSOP16 plastic thin shrink small outline package version. This family is designed for scenarios where correct system operation is critical even when multiple controllers issue commands concurrently.

Signal Buffers, Repeaters, Splitters Replacement Considerations

PCA9541A is a related 2-to-1 I2C bus master selector from the same manufacturer.