MC74HC165AMN2TWG

Shift Registers Overview

The MC74HC165AMN2TWG is an 8-bit parallel-in serial-out shift register manufactured by onsemi. It operates within a supply voltage range of 2.0 V to 6.0 V and supports an operating temperature range from -55°C to +125°C. The device features asynchronous parallel loading and serial shifting capabilities controlled by a Serial Shift/Parallel Load input. It includes two clock inputs (Clock and Clock Inhibit) for flexible timing control. Propagation delay from clock to output reaches 225 ns at 2.0 V. The component is housed in a QFN-16 package.

Shift Registers Feature Summary

• Supports asynchronous parallel data loading and serial shifting operations
• Features dual clock inputs allowing independent clocking or clock inhibition functions
• Provides complementary non-inverted and inverted outputs from the final stage
• Compatible with standard CMOS outputs and LSTTL outputs when pullup resistors are used

Shift Registers Applications

• Expanding digital input ports in microcontroller systems
• Interfacing keypad arrays or switch matrices to logic circuits
• Data acquisition systems requiring parallel-to-serial conversion
• Industrial control panels utilizing multiple discrete inputs

Shift Registers Procurement Notes

Verify the specific ordering suffix 'MN2TWG' against official onsemi documentation to confirm the QFN-16 package type and tape-and-reel shipping configuration. Ensure the '-Q' suffix requirement is not necessary, as this part number lacks it, indicating standard commercial qualification rather than automotive AEC-Q100 compliance. Confirm RoHS and halogen-free status matches project specifications.

Shift Registers Selection Notes

Select this component when an 8-bit parallel-to-serial interface is required with wide voltage flexibility between 2.0 V and 6.0 V. The QFN-16 package offers a compact footprint suitable for space-constrained designs. Consider the propagation delay characteristics at the target operating voltage to ensure timing requirements are met. Verify that the high noise immunity of CMOS technology aligns with the environmental conditions of the application.

Shift Registers Part Context

This device belongs to the MC74HC165A family of high-performance silicon-gate CMOS logic components. It shares pinout compatibility with older LS165 devices, facilitating legacy upgrades. The HC series provides low input current and high noise immunity compared to standard TTL logic. The QFN-16 package variant is designed for surface-mount assembly, offering thermal and mechanical advantages over through-hole alternatives.

Shift Registers Replacement Considerations

MC74HC165ADTR2G-Q

Shift Registers FAQ

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

When the Serial Shift/Parallel Load input is low, data from the parallel inputs (A-H) is loaded asynchronously into the internal stages. When the input is high, data is shifted serially from the SA input on the rising edge of the clock.

What is the function of the Clock Inhibit input?

The Clock Inhibit input allows one of the two clock pins to act as an inhibit signal. If designated as such, driving it high prevents clocking even if the primary Clock input is active, provided the inhibit goes high only while the clock is high to avoid double clocking.