MC74HCT245ADWR2G

Overview

The MC74HCT245ADWR2G is an octal bus transceiver manufactured by onsemi, utilizing high-performance silicon-gate CMOS technology. It provides bidirectional asynchronous communication between data buses with three-state outputs. The device operates within a DC supply voltage range of 4.5 V to 5.5 V and features LSTTL-compatible inputs, allowing direct interfacing with TTL, NMOS, and CMOS systems. Packaged in a 20-pin SOIC-Wide format, it includes an active-low output enable pin for high-impedance control and a direction control pin to manage data flow orientation.

Feature Summary

• Octal bidirectional data transfer capability for two-way asynchronous communication
• LSTTL compatible input levels enabling seamless interface with various logic families
• Three-state outputs with active-low enable for effective bus isolation
• High noise immunity and robust latch-up performance exceeding specified current limits

Applications

• Interfacing TTL or NMOS outputs to High Speed CMOS inputs
• Level conversion between different logic voltage domains
• Bidirectional data bus buffering in computing and industrial systems

Procurement Notes

Verify the complete part number including the suffix '2G' to ensure compliance with RoHS standards and lead-free manufacturing requirements. Confirm the SOIC-20 package type matches your PCB footprint design. Check the specific revision status of the datasheet for any updates regarding operating conditions or electrical characteristics before finalizing component selection.

Selection Notes

Select this component when interfacing between 5V CMOS systems and legacy TTL/NMOS devices requiring level compatibility. Ensure the operating voltage remains strictly within the 4.5 V to 5.5 V range to maintain signal integrity. Consider the propagation delay specifications if high-speed data transmission is critical for the application timing requirements.

Part Context

This device belongs to the MC74HCT series of logic integrated circuits from onsemi. It shares pinout compatibility with LS245 equivalents while offering improved performance through CMOS technology. The series is designed for general-purpose digital applications requiring reliable data transfer across mixed-logic environments.

Replacement Considerations

MC74HCT245ADW

FAQ

What is the function of the DIR pin?

The DIR pin determines the direction of data flow, controlling whether data transfers from port A to port B or from port B to port A.

How does the OE pin operate?

The Output Enable (OE) pin is active-low; when asserted low, the outputs are enabled, and when high, the I/O ports enter a high-impedance state.