M74HC244B1R

Overview

The M74HC244B1R is an octal bus buffer with three-state outputs fabricated using advanced high-speed CMOS silicon gate C2MOS technology. It operates within a wide supply voltage range of 2V to 6V and features balanced propagation delays where tPLH is approximately equal to tPHL. The device includes two independent groups of four buffers controlled by separate G enable inputs, providing symmetrical output impedance with minimum drive currents of 6mA for both high and low states.

Feature Summary

• Octal bus buffer architecture with non-inverted three-state outputs
• Dual control inputs governing four buffers each
• High noise immunity with input thresholds at 28% of VCC
• Integrated protection circuits against static discharge and transient excess voltage

Applications

• Memory address drivers
• Clock drivers
• Bus-oriented communications
• Input/output buffering

Procurement Notes

Verify component status as the datasheet identifies this part as obsolete. Confirm package type matches the DIP-20 designation associated with the B1R suffix. Ensure compatibility with existing PCB footprints before procurement planning.

Selection Notes

Select this component for designs requiring octal buffering with three-state capability. Verify that the operating temperature range of -55°C to +125°C meets environmental requirements. Check that the 2V to 6V supply voltage aligns with system power rails.

Part Context

This component belongs to the 74HC series of logic integrated circuits manufactured by STMicroelectronics. It utilizes C2MOS technology to achieve high speed and low power dissipation. The device is functionally compatible with standard 74 Series 244 logic families.

Replacement Considerations

Direct substitutes include M74HC244M1R (SOP) and M74HC244TTR (TSSOP). Cross-manufacturer equivalents such as SN74HC244 or CD74HC244 may be considered if pin-compatible.