PCA9543CPW,118

Specialized Overview

The PCA9543CPW,118 is a bidirectional translating switch controlled by the I2C-bus, featuring two downstream channels. It operates within a supply voltage range of 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. The device includes active LOW interrupt inputs for each channel and an ANDed interrupt output. An active LOW reset input allows recovery from stuck bus conditions. All I/O pins are 5 V tolerant. The component is housed in a TSSOP14 package (SOT402-1) and functions across an ambient temperature range of -40 °C to +85 °C.

Specialized Feature Summary

• Provides two independent bidirectional switches that fan out upstream SCL/SDA lines to separate downstream pairs.
• Supports voltage level translation between 1.8 V, 2.5 V, 3.3 V, and 5 V buses using the VDD pin to limit passed high voltage.
• Includes dedicated interrupt logic with two active LOW inputs and one combined active LOW output.
• Features an active LOW reset input to clear the I2C-bus state machine and deselect all channels.

Specialized Applications

• Expanding I2C/SMBus networks by connecting multiple slave devices with identical addresses.
• Interfacing low-voltage components (e.g., 1.8 V or 2.5 V) with 5 V peripherals without external protection.
• Managing hot insertion events on I2C buses while preventing glitches during power-up.

Specialized Procurement Notes

Verify the specific ordering suffix '118' corresponds to the required tape-and-reel packaging configuration. Confirm the 'CPW' designation matches the TSSOP14 package variant rather than the SO14 option. Ensure the 'C' suffix indicates the correct fixed slave address portion for system compatibility. Cross-reference the manufacturer's latest documentation for any updates to the RoHS compliance status or material declarations.

Specialized Selection Notes

Select this variant when the specific fixed slave address associated with the 'C' designation is required to resolve conflicts in larger systems. Choose the TSSOP14 package if space constraints favor a thin shrink small outline form factor over the standard SO14. Ensure the design accommodates the maximum on-state resistance of approximately 51 Ω at higher supply voltages. Verify that the system can tolerate the standby current specifications under the intended operating temperature range.

Specialized Part Context

This component belongs to the PCA9543A/B/C family of 2-channel I2C-bus switches. The PCA9543A, PCA9543B, and PCA9543C variants are functionally identical but differ in their fixed hardware-selectable slave address bits. This differentiation allows up to 12 devices to coexist on a single I2C bus by combining the three address versions with two hardware-selectable address pins.

Specialized Replacement Considerations

PCA9543APW,118: Identical functionality with different fixed slave address. PCA9543BPW,118: Identical functionality with different fixed slave address. PCA9543AD,112: Same electrical characteristics but utilizes the SO14 package instead of TSSOP14.