TC74AC640F(EL,F)

Overview

The TC74AC640F(EL,F) is an octal bus transceiver from the Toshiba AC logic series, featuring 3-state inverting outputs. It operates within a supply voltage range of 2.0 V to 5.5 V and supports a maximum operating temperature of 85 °C. The device provides a minimum output current of 24 mA at 4.5 V and achieves typical propagation delays of 3.9 ns at 5.0 V. It utilizes SOP20 packaging with silicon gate C2MOS technology.

Feature Summary

• Octal bus transceiver architecture designed for two-way asynchronous communication between data busses.
• Inverting type configuration with balanced propagation delays (tPLH ≈ tPHL).
• Inputs equipped with protection circuits against static discharge or transient excess voltage.
• Pin and function compatible with equivalent Bipolar Schottky TTL devices.

Applications

• Two-way asynchronous communication between data busses.
• High-speed operation applications requiring CMOS low power dissipation.
• Systems requiring isolation of busses via the enable input.

Procurement Notes

Verify that the specific ordering suffix matches the required package variant, as the datasheet covers multiple packages including SOP20. Confirm compliance with environmental directives such as RoHS through official manufacturer channels. Ensure all unused inputs and floating bus pins are properly terminated with pull-up or pull-down resistors to prevent undefined states.

Selection Notes

Select this component when an inverting octal bus transceiver is required for bidirectional data transfer. The device is suitable for designs needing high noise immunity and wide operating voltage ranges. Consider the 3-state output capability for effective bus isolation. Verify that the application does not involve unintended uses prohibited by the manufacturer's restrictions.

Part Context

This part belongs to the TC74AC series of advanced high-speed CMOS digital integrated circuits. It shares functional similarities with the non-inverting TC74AC245F but provides inverting logic. The technology combines silicon gate and double-layer metal wiring C2MOS processes to achieve performance comparable to Bipolar Schottky TTL while maintaining low power consumption.

Replacement Considerations

The TC74AC245F is a pin-compatible alternative offering non-inverting functionality instead of inverting. Designers must account for the logical inversion difference when substituting components. Other family members may offer different package options or speed grades.