CD74HCT164MT

Shift Registers Overview

The CD74HCT164MT is an 8-bit serial-in, parallel-out shift register manufactured by Texas Instruments under the National Semiconductor brand. It operates on a single 5 V supply with a voltage range of 4.5 V to 5.5 V. The device utilizes HCT logic technology and features edge-triggered data shifting on the rising clock pulse. It includes two gated serial data inputs (DSA and DSB) that perform a logical AND operation before entering the register. An asynchronous master reset input allows for immediate clearing of all outputs regardless of the clock state.

Shift Registers Feature Summary

• Gated serial data inputs allow data entry through either DSA or DSB terminals
• Asynchronous master reset function forces all outputs to a low state immediately
• Edge-triggered shifting mechanism synchronizes data movement with clock pulses
• CMOS construction ensures compatibility with LSTTL logic families

Shift Registers Applications

• Serial-to-parallel data conversion in digital communication systems
• Parallel output expansion for microcontroller I/O ports
• Status indication circuits requiring sequential data display
• Digital signal processing interfaces needing temporary storage buffers

Shift Registers Procurement Notes

Verify the manufacturer designation as Texas Instruments, which acquired National Semiconductor's logic product lines. Confirm the package type corresponds to the SOIC-14 variant indicated by the MT suffix. Ensure the operating temperature range matches the specific grade required for your application environment. Cross-reference the datasheet revision to confirm pinout consistency with legacy designs.

Shift Registers Selection Notes

Select this component when interfacing serial data streams with parallel loads in 5 V CMOS environments. The HCT series ensures direct compatibility with TTL-level signals without additional level shifting. Consider the asynchronous reset feature for system initialization requirements. Evaluate the propagation delay specifications against your maximum clock frequency constraints to ensure reliable data transfer timing.

Shift Registers Part Context

This part belongs to the 74HCT164 family of high-speed CMOS shift registers. It serves as a standard solution for converting serial bit streams into parallel byte formats. The device is widely used in embedded systems where space-constrained packaging is necessary. Its pinout remains compatible with earlier LSTTL versions, facilitating design upgrades.

Shift Registers Replacement Considerations

Direct substitutes include MM74HCT164MX from onsemi and SN74HCT164N variants. Verify electrical characteristics such as supply current and switching speeds match original requirements. Check package dimensions to ensure mechanical fit within existing PCB layouts.