MC74HC126AFELG

Overview

The MC74HC126AFELG is a quad bus buffer featuring three-state noninverting outputs, fabricated using high-performance silicon-gate CMOS technology. It operates within a supply voltage range of 2.0 V to 6.0 V and provides an output drive capability equivalent to 15 LSTTL loads. The device includes four separate active-high output enables, allowing precise control over data flow in bus-oriented systems. Designed for compatibility with standard CMOS and TTL outputs, it ensures balanced propagation delays and low power dissipation while maintaining high noise immunity.

Feature Summary

• Features four independent noninverting buffers with active-high three-state output enables
• Provides direct interface capability to CMOS, NMOS, and TTL logic families
• Delivers high-speed operation with balanced propagation delays across the operating voltage range
• Includes power-down protection on inputs to prevent excessive current draw during standby

Applications

• Three-state memory address drivers
• Clock signal distribution drivers
• Bus-oriented system data routing

Procurement Notes

Verify that the specific suffix 'FELG' corresponds to the requested package type and tape-and-reel configuration as defined in the official ordering information. Confirm RoHS compliance status and check for any site-specific manufacturing requirements associated with the part number before finalizing procurement orders.

Selection Notes

Select this component when designing circuits requiring active-high enable control for bus isolation. Ensure the application voltage remains within the 2.0 V to 6.0 V range for HC series operation. Verify input compatibility with the driving source, noting that pull-up resistors may be required for LSTTL output interfacing.

Part Context

This device belongs to the MC74HC126A family of quad bus buffers. It shares pinout compatibility with LS126 equivalents but utilizes advanced CMOS technology for lower power consumption. The family supports both SOIC-14 and TSSOP-14 packages, offering flexibility for surface-mount assembly designs requiring compact footprints.

Replacement Considerations

MC74HC126ADR2G

FAQ

What is the logic function of the output enable pin?

The output enable (OE) pins are active-high. When OE is high, the buffer passes the input signal to the output. When OE is low, the outputs enter a high-impedance state.

How does the MC74HC126 differ from the MC74HC125?

The primary difference is the polarity of the output enable controls. The MC74HC126 uses active-high enables, whereas the MC74HC125 uses active-low enables. Both share identical pinouts and logical functions otherwise.