MC74HC165AFELG

Shift Registers Overview

The MC74HC165AFELG is an 8-bit serial or parallel-input/serial-output shift register manufactured by onsemi. It utilizes high-performance silicon-gate CMOS technology and operates within a DC supply voltage range of 2.0 to 6.0 V. The device features asynchronous parallel loading capability when the Serial Shift/Parallel Load input is low, and serial shifting on the rising edge of either Clock or Clock Inhibit inputs when that control signal is high. It provides complementary outputs (QH and QH) from the final stage.

Shift Registers Feature Summary

• Supports both asynchronous parallel data loading and synchronous serial shifting operations via dedicated control inputs.
• Features dual clock inputs (Clock and Clock Inhibit) that function identically, allowing for flexible timing control or clock inhibition.
• Outputs are directly compatible with standard CMOS, NMOS, and TTL logic families without additional interface components.

Shift Registers Applications

• Converting parallel data streams into serial format for transmission
• Expanding digital input capacity in microcontroller systems
• Interfacing between different logic families such as TTL and CMOS

Shift Registers Procurement Notes

Verify the specific suffix 'FELG' against official ordering information, as the primary datasheet lists 'DG', 'DR2G', and 'ADTR2G'. Confirm package type matches SOIC-16 requirements. Ensure compliance with RoHS and Pb-Free standards if required by the application environment. Check for automotive qualification suffixes if operating in harsh conditions.

Shift Registers Selection Notes

Select this component when an 8-bit shift register with parallel load capability is needed. It is suitable for applications requiring direct interfacing with CMOS, NMOS, or TTL outputs. Consider the 2.0 V to 6.0 V operating range for power supply compatibility. Verify that the SOIC-16 package fits the PCB layout constraints.

Shift Registers Part Context

This part belongs to the MC74HC165A family of 8-bit shift registers. It is pin-compatible with the LS165 variant but offers improved performance through silicon-gate CMOS technology. The family includes HC and HCT versions, with the HC version supporting a wider voltage range compared to the HCT version which is optimized for 5 V operation.

Shift Registers Replacement Considerations

MC74HC165ADG

Shift Registers FAQ

How does the Serial Shift/Parallel Load input control data entry?

When the Serial Shift/Parallel Load input is low, data at the parallel inputs (A-H) is loaded asynchronously. When it is high, data at the Serial Data Input (SA) is shifted into the register on the rising edge of the Clock.

Can the Clock and Clock Inhibit pins be used interchangeably?

Yes, both pins function identically as active-high clocks. One can be designated as a clock inhibit, but it should go high only while the other clock input is high to avoid double clocking.