74VHCT273ATTR

Overview

The 74VHCT273ATTR is an octal D-type flip-flop manufactured by STMicroelectronics, belonging to the VHCT logic series. It features positive-edge triggering and a master reset input that forces outputs low independently of clock or data states. The device operates within a supply voltage range of 4.5 V to 5.5 V, with a quiescent current of 4 µA. It supports output drive currents of 8 mA for both high and low states. The component is designed for through-hole mounting in a 20-DIP package.

Feature Summary

• Octal D-type flip-flop architecture with eight independent storage elements
• Positive-edge triggered operation synchronized with clock transitions
• Master reset function overrides clock and data inputs to force outputs low
• TTL-compatible input levels ensuring interface compatibility with standard logic families

Applications

• Parallel-to-serial data conversion circuits
• Shift register configurations for data storage and transfer
• State machine implementation in digital control systems
• Memory buffer applications requiring synchronous data latching

Procurement Notes

Verify component authenticity through authorized distributors due to potential counterfeit risks. Confirm package marking matches the 20-DIP specification. Check manufacturing date codes against project lifecycle requirements as availability may vary. Ensure supply chain compliance with RoHS directives. Validate electrical parameters against specific application load conditions before integration.

Selection Notes

Select this component when TTL-compatible inputs are required alongside CMOS performance characteristics. The VHCT series bridges HC and HCT logic families, offering faster switching speeds than standard HCT devices. Consider the 20-DIP package for prototyping or applications requiring manual insertion. Evaluate thermal dissipation needs given the 8 mA output drive capability across all eight channels simultaneously.

Part Context

This part belongs to the 74VHCT family, which combines CMOS speed with TTL input compatibility. Unlike the older 74HC273, the VHCT variant provides improved noise immunity and higher operating frequencies. The 'ATTR' suffix typically denotes specific packaging or tape-and-reel variations, though this specific model is documented in DIP format. It serves as a direct functional replacement for other octal D-flip-flops in legacy designs requiring precise timing control.

Replacement Considerations

CD74HCT273E from Texas Instruments offers similar functionality with comparable pinout and electrical characteristics. SN74HCT273N provides a direct drop-in alternative for through-hole implementations. Verify voltage tolerance and propagation delay specifications match original design constraints when substituting.