74ABT126CSC

Buffers, Drivers, Receivers, Transceivers Overview

The Fairchild Semiconductor 74ABT126CSC is a quad buffer and line driver featuring three-state outputs, designed for high-speed digital applications. It operates within a supply voltage range of 4.5V to 5.5V and utilizes BiCMOS technology to achieve fast switching speeds with low power dissipation. The device includes dedicated output enable inputs (nOE) that control the state of the four independent channels. When nOE is LOW, the outputs enter a high-impedance OFF-state, effectively isolating the bus. This component supports partial power-down modes through integrated I_OFF circuitry, which prevents damaging backflow currents when the device is powered down while other system components remain active.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Quad bus interface with three-state buffers allowing live insertion and extraction
• Integrated I_OFF circuitry enables safe partial power-down mode operation
• Direct interface compatibility with TTL logic levels
• High drive capability providing +64mA sink and -32mA source current

Buffers, Drivers, Receivers, Transceivers Applications

• Memory address drivers in computer systems
• Clock distribution networks
• Bus-oriented transmitter and receiver circuits
• Partial power-down applications requiring isolation

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'CSC' against official Fairchild or onsemi documentation, as this designation typically indicates a specific tape-and-reel packaging configuration rather than a functional variant. Confirm the manufacturer status, as Fairchild's semiconductor division was acquired by onsemi; ensure the datasheet corresponds to the correct entity. Cross-reference the pinout and electrical characteristics with the official 74ABT126 datasheet to guarantee compatibility with your design requirements before finalizing procurement.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when a quad buffer with three-state outputs is required for high-speed data transmission. It is suitable for designs needing direct TTL interfacing and robust drive strength. Consider the 74ABT series for superior speed compared to standard 74LS or 74HC families. Ensure the application benefits from the partial power-down feature to protect downstream components during system power cycles. Verify package availability in SC-14 or similar formats if surface mount assembly is planned.

Buffers, Drivers, Receivers, Transceivers Part Context

The 74ABT126 belongs to the ABT logic family, which combines the high speed of Schottky TTL with the low power consumption of CMOS technology. Manufactured originally by Fairchild Semiconductor and now under onsemi, this series is widely used in high-performance computing and telecommunications. The 74ABT126 specifically addresses the need for buffered signals on bidirectional buses, offering controlled driving capabilities and high impedance states to prevent signal contention.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Public confirmed substitute part numbers include 74ABT126D and 74ABT126PW from NXP Semiconductors. These alternatives share identical logical functions and pinouts. Verify that the replacement package type matches your PCB footprint and that the supplier's quality standards align with your manufacturing requirements.