M74HCT244B1R

Overview

The M74HCT244B1R is an octal bus buffer with three-state outputs manufactured by STMicroelectronics. It operates within a supply voltage range of 4.5V to 5.5V and features non-inverted logic. The device utilizes silicon gate C2MOS technology for high-speed performance, characterized by a typical propagation delay of 15ns at VCC = 4.5V. It provides symmetrical output impedance with minimum drive currents of 6mA for both high and low states. The component is housed in a 20-DIP package with a standard pitch of 0.300 inches (7.62mm) and supports through-hole mounting.

Feature Summary

• Octal configuration providing eight independent buffered channels
• Three-state output capability allowing effective isolation when disabled
• Non-inverted signal transmission from input to output
• TTL-compatible input thresholds ensuring compatibility with standard logic families

Applications

• Memory address drivers
• Clock drivers
• Bus-oriented architectures
• Transceiver circuits

Procurement Notes

Verify the specific suffix 'B1R' against the manufacturer's current documentation to confirm pinout and electrical specifications match your design requirements. Confirm RoHS compliance status as per the latest datasheet revision. Ensure the 20-DIP package dimensions align with your PCB footprint constraints before finalizing procurement.

Selection Notes

Select this component when an octal buffer with three-state control is required for 5V logic systems. It serves as a direct functional replacement for standard 74244 devices. Consider the 15ns propagation delay and 6mA drive strength for timing and load analysis. Verify that the operating temperature range meets the environmental conditions of the target application.

Part Context

This part belongs to the 74HCT series of advanced high-speed CMOS logic devices. The HCT series is designed to be compatible with TTL inputs while offering CMOS noise immunity and power efficiency. The M74HCT244 variant specifically provides octal buffering capabilities, distinguishing it from hex inverters or quad gates within the same family.

Replacement Considerations

Direct substitutes include the SN74HCT244N from Texas Instruments and the CD74HCT244E from Texas Instruments. These alternatives maintain pin and function compatibility with the original component.