ET74HC245V

Overview

The ET74HC245V is an octal bus transceiver manufactured by ETEK MICROELECTRONICS, utilizing high-speed CMOS technology. It features non-inverting three-state outputs compatible with LSTTL logic levels. The device operates within a supply voltage range of 2.0V to 6.0V and provides bidirectional data transfer controlled by Direction (DIR) and Output Enable (OE) inputs. Key electrical parameters include a drive current of ±7.8mA and a transmission delay of 7ns at 5V. It supports operating temperatures from -40°C to +125°C and includes ESD protection exceeding 2000V per the Human Body Model.

Feature Summary

• Bidirectional octal bus interface with direction control
• Non-inverting three-state outputs for bus isolation
• LSTTL pin-compatible CMOS construction
• High electrostatic discharge protection capability

Applications

• Bidirectional data bus communication systems
• I/O port expansion in microcontroller circuits
• Signal buffering for display drivers
• Telecommunications equipment interfaces

Procurement Notes

Verify the specific manufacturer datasheet for the ET74HC245V to confirm package type and temperature grade. Ensure compatibility with existing system voltage levels between 2.0V and 6.0V. Check for required pull-up resistors if interfacing with open-collector buses. Confirm ESD handling procedures during assembly to maintain device integrity.

Selection Notes

Select this component when an eight-channel bidirectional buffer is required for low-power CMOS applications. It serves as a direct replacement for standard 74HC245 equivalents in designs needing LSTTL compatibility. Consider the wide operating voltage range for flexibility in varying power supply environments. Verify thermal requirements against the specified -40°C to +125°C range.

Part Context

This part belongs to the 74HC series of high-speed CMOS logic devices. It functions similarly to the 74HC640 but provides true (non-inverting) outputs instead of inverted ones. The device is designed to replace older TTL technologies while offering lower power consumption and higher noise immunity typical of modern CMOS processes.

Replacement Considerations

Direct substitutes include the SN74HC245, TC74HC245, and MC74HC245. Verify that alternative manufacturers offer the same 20-pin package configuration and identical pinout assignments to ensure board-level interchangeability without schematic modifications.