TC74AC640FTEL

Overview

The TC74AC640FTEL is an octal bus transceiver from the Toshiba AC logic series, featuring three-state inverting outputs. It utilizes silicon gate and double-layer metal wiring C2MOS technology to achieve high-speed operation comparable to Bipolar Schottky TTL while maintaining low power dissipation. The device supports a wide operating voltage range of 2.0 V to 5.5 V. Typical propagation delay is 3.9 ns at 5.0 V supply. Maximum quiescent supply current is 8.0 µA at 25 °C. Minimum output current capability is 24 mA at 4.5 V. Noise immunity is specified at 28% of VCC minimum.

Feature Summary

• Octal bus transceiver with three-state inverting outputs for two-way asynchronous communication between data busses.
• Direction of data transmission is controlled by the DIR input level, while the G input isolates the busses when disabled.
• All inputs include protection circuits against static discharge or transient excess voltage.
• Balanced propagation delays (tPLH ≈ tPHL) ensure signal integrity across the eight channels.

Applications

• Two-way asynchronous communication between data busses
• Memory and memory mapping applications
• Clock drivers and buffer circuits

Procurement Notes

Verify the specific ordering suffix matches the required package type, as the base part number may correspond to different physical packages. Confirm RoHS compliance status directly with the manufacturer or authorized distributor before finalizing procurement. Ensure the design accounts for the absolute maximum ratings to prevent damage during operation.

Selection Notes

Select this component for designs requiring high-speed bidirectional data transfer with inverting logic functionality. It is suitable for systems needing balanced propagation delays and strong drive capabilities. Verify that the system voltage falls within the 2.0 V to 5.5 V range. Consider the pinout compatibility with legacy 74F series designs if migrating existing architectures.

Part Context

This device belongs to the TC74AC series of advanced high-speed CMOS logic integrated circuits manufactured by Toshiba Semiconductor and Storage. The AC series is designed to offer performance levels similar to Bipolar Schottky TTL but with the lower power consumption characteristic of CMOS technology. The TC74AC640F specifically provides octal bus transceiver functionality with three-state outputs.

Replacement Considerations

The datasheet notes pin and function compatibility with the 74F245/640 series. When replacing components, verify that the substitute device maintains the same inverting logic polarity and three-state output characteristics. Ensure the replacement supports the required operating voltage range and propagation delay specifications for the application.