TCAL6408DTUR

Overview

The TCAL6408DTUR is an 8-bit translating I2C-bus and SMBus I/O expander manufactured by Texas Instruments. It operates with a supply voltage range of 1.08V to 3.6V on both the VCCI (I2C bus) and VCCP (P-ports) sides, supporting bidirectional voltage-level translation between 1.2V, 1.8V, 2.5V, and 3.3V domains. The device supports I2C clock frequencies up to 1MHz (Fast-mode Plus). Key electrical parameters include a typical standby current of 1µA at 1.8V, latched outputs capable of sinking up to 25mA per port, and ESD protection exceeding ±4000V (HBM) and ±1000V (CDM). It features Agile I/O configuration registers for programmable drive strength, pull-up/down resistors, and interrupt masking.

Feature Summary

• Bidirectional voltage-level translation capability between varying logic levels
• Agile I/O configuration including programmable drive strength and internal resistors
• Hardware address pin allowing two devices on the same bus
• Active-low reset input and open-drain active-low interrupt output

Applications

• Servers
• Routers and telecom switching equipment
• Personal computers and electronics
• Industrial automation systems
• Gaming consoles

Procurement Notes

Verify the specific package marking and date code against the manufacturer's latest orderable information. Confirm that the DTU (X2QFN) package variant matches the design-in requirements for thermal performance and PCB footprint dimensions. Ensure compatibility with the system's I2C controller voltage levels before finalizing procurement.

Selection Notes

Select this component when GPIO expansion is required alongside voltage translation between different power domains. The Agile I/O features are suitable for designs needing optimized power consumption or specific EMI characteristics. Verify that the 25mA sink current capability meets the load requirements for connected peripherals such as LEDs or switches.

Part Context

The TCAL6408 belongs to Texas Instruments' family of translating I/O expanders designed for I2C and SMBus protocols. It addresses the need for interface flexibility in systems where processors operate at lower voltages than peripheral devices. The device integrates multiple configuration registers to enhance I/O performance regarding speed and power efficiency.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.