PCA9544APWR

Specialized Overview

The PCA9544APWR is a quad bidirectional translating switch manufactured by Texas Instruments, designed for I2C and SMBus systems. It features four active-low interrupt inputs and an active-low interrupt output to facilitate bus monitoring. The device includes three address pins, allowing up to eight devices to coexist on the same I2C bus. It operates within a supply voltage range of 1.65 V to 5.5 V and supports data rates compatible with Standard Mode and Fast Mode I2C protocols. The component is housed in a 20-TSSOP package and functions reliably across an operating temperature range from -40°C to +85°C.

Specialized Feature Summary

• Provides one-of-four bidirectional translating switches controlled via the I2C bus
• Includes four active-low interrupt inputs and an active-low interrupt output
• Supports multiple device addressing with three dedicated address pins

Specialized Applications

• I2C bus extension in mixed-voltage environments
• SMBus system architecture requiring signal translation
• Multi-master I2C configurations with isolated channels

Specialized Procurement Notes

Verify the specific suffix 'PWR' corresponds to the TSSOP-20 package and reel packaging configuration when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributor datasheets prior to integration. Ensure the part number matches the exact functional specification for bidirectional switching rather than similar variants like the PCA9545A which offers different channel control logic.

Specialized Selection Notes

Select this component when designing systems requiring independent control of four downstream I2C/SMBus channels from a single upstream pair. It is suitable for applications needing interrupt-driven bus management and voltage level translation between 1.65 V and 5.5 V domains. Compare against the PCA9545A if simultaneous multi-channel activation is required, as the PCA9544A restricts selection to one channel at a time based on its control register.

Specialized Part Context

This part belongs to the Texas Instruments PCA95xx family of interface ICs, specifically categorized under bidirectional translating switches. It complements other bus expansion and repeater solutions like the PCA9515A by providing logical channel selection rather than simple signal buffering. The device addresses the need for complex I2C network topologies where multiple slave devices share limited bus lines.

Specialized Replacement Considerations

The PCA9544APW is the lead-free equivalent without the reel suffix. For designs requiring simultaneous multi-channel access, the PCA9545A series serves as a functional alternative with identical pinouts but different control logic.