CD74HC125EE4

Overview

The CD74HC125EE4 is a high-speed CMOS logic device containing four independent buffers with three-state outputs. It operates within a supply voltage range of 2 V to 6 V and supports an operating temperature range from -55°C to +125°C. The component provides balanced output drive capabilities, supporting fanout up to 10 LSTTL loads while significantly reducing power consumption compared to LSTTL logic ICs. It utilizes standard CMOS inputs and features active-low output enable control.

Feature Summary

• Contains four independent buffers performing the Boolean function Y = A in positive logic
• Features three-state outputs that can be placed into a high-impedance state via active-low enable signals
• Provides balanced CMOS outputs capable of sinking and sourcing similar currents
• Supports wide operating voltage and temperature ranges for industrial applications

Applications

• Enabling digital signals on data buses
• Controlling bus connections by disabling outputs when circuitry is powered off
• Driving loads requiring fast edge rates into light capacitive loads

Procurement Notes

Verify the specific package type and lead finish against the orderable addendum. Confirm RoHS compliance status and moisture sensitivity level ratings prior to procurement. Ensure the selected variant matches the required thermal resistance and pin configuration for the intended PCB layout.

Selection Notes

Select this component for designs requiring quad buffering with tri-state capability. Consider the input transition time limits to prevent excessive current consumption. Evaluate the maximum load capacitance requirements to ensure signal integrity without exceeding switching characteristics. Verify that unused inputs are terminated to prevent undefined operational states.

Part Context

This part belongs to the CDx4HC125 family of quadruple buffers with three-state outputs. It is manufactured by Texas Instruments as a high-speed CMOS logic device. The EE4 suffix indicates a specific packaging and environmental compliance variation within the PDIP-14 product line.

Replacement Considerations

CD74HC125E

FAQ

How should unused inputs be handled?

Unused inputs must not be left floating. They should be terminated to either VCC or ground to prevent undefined operational states.

What is the recommended bypass capacitor value?

A 0.1-μF capacitor is recommended for each VCC terminal, placed physically close to the device to prevent power disturbance.