74HCT245D

Overview

The Toshiba Semiconductor and Storage 74HCT245D is a high-speed CMOS octal bus transceiver fabricated with silicon gate C2MOS technology. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range from -40 °C to +125 °C. The device features balanced propagation delays, achieving a typical delay of 11 ns at 5.5 V. It provides three-state outputs and maintains low power dissipation with a maximum quiescent current of 4.0 µA at 25 °C.

Feature Summary

• High-speed operation comparable to equivalent LSTTL while maintaining CMOS low power dissipation characteristics.
• Inputs are compatible with TTL, NMOS, and CMOS output voltage levels for wide interfacing ability.
• All inputs include protection circuits against static discharge or transient excess voltage.

Applications

• Two-way asynchronous communication between data busses
• Bus driver applications requiring direction control via DIR input
• System isolation using the enable input (G) to disable the device

Procurement Notes

Verify the specific manufacturer part number against official Toshiba documentation to ensure compatibility with the SOIC-20 package and HCT logic family specifications. Confirm that the component meets the required operating temperature range and electrical characteristics for the intended application environment before procurement.

Selection Notes

Select this component when bidirectional data transfer is required between buses with different logic families. The HCT series ensures TTL compatibility, making it suitable for systems mixing older digital standards with modern CMOS designs. Ensure the design accounts for the absolute maximum ratings regarding supply voltage and output current to prevent device damage.

Part Context

This component belongs to the 74HCT logic family, which bridges the performance gap between standard HC logic and LSTTL. Manufactured by Toshiba Semiconductor and Storage, it utilizes advanced silicon gate C2MOS technology to deliver high switching speeds without the excessive power consumption typically associated with bipolar technologies.

Replacement Considerations

Consult official Toshiba documentation for confirmed substitute part numbers. Generic equivalents may differ in electrical parameters such as propagation delay or output drive strength. Verify pinout compatibility and logic level requirements before substituting.