CD74HC245M

Overview

The CD74HC245M is a high-speed CMOS octal bus transceiver manufactured by Harris Corporation. It features three-state outputs and non-inverting logic, allowing bidirectional data transfer between two 8-bit buses. The device operates within a supply voltage range of 2.0V to 6.0V and supports an operating temperature range from -55°C to 125°C. It utilizes a 20-pin Small Outline (SO) plastic package with 20 terminals.

Feature Summary

• Provides bidirectional data transmission between two 8-bit buses via dedicated direction control input
• Features three-state outputs that effectively isolate the bus when disabled by the output enable input
• Compatible with low-power Schottky TTL (LSTTL) logic levels for seamless system integration

Applications

• High-performance memory mapping applications requiring wide data paths
• Clock drivers and buffered oscillators in digital systems
• Bus-oriented architectures in telecommunications equipment

Procurement Notes

Verify component authenticity as original Harris Corporation manufacturing records may be archived. Confirm RoHS compliance status, as older production runs often lack modern environmental certifications. Ensure the specific suffix 'M' corresponds to the required SOIC-20 package variant for your PCB layout constraints.

Selection Notes

Select this component for designs requiring robust bidirectional data flow with high noise immunity. The HC series offers superior speed compared to standard 74HC devices while maintaining low power consumption. Verify that the 2.0V to 6.0V operating range aligns with your system's power supply rails before finalizing the schematic.

Part Context

This part belongs to the widely adopted 74HC logic family, known for compatibility with LSTTL inputs. As a Harris Corporation product, it represents legacy semiconductor manufacturing now often absorbed into other entities like Texas Instruments. The CD74HC245M serves as a foundational interface component for parallel data communication in industrial and commercial electronics.

Replacement Considerations

Equivalent parts include the Texas Instruments SN74HC245N or SN74HC245D. Other manufacturers such as Toshiba offer the 74HC245D. Verify pinout compatibility and electrical specifications against current datasheets before substitution.