Overview: DATA SHEET .onsemi. Quad Bus Buffer with 3-State Control Inputs
MC74VHC125, MC74VHCT125A
The MC74VHC125 and MC74VHCT125A are high speed CMOS bus buffers fabricated with silicon gate CMOS technology. These achieve high speed operation similar to equivalent Bipolar Schottky TTL while maintaining CMOS low power dissipation.
These devices require the 3−state control input (OE) to be set High to place the output into the high impedance state.
The MC74VHC125 inputs are patible with standard CMOS levels while the MC74VHCT125A inputs are patible with TTL levels. This device can be used as a level converter for interfacing 3.3 V to 5.0 V, because it has full 5.0 V CMOS level output swings.
The MC74VHC125 and MC74VHCT125A internal circuits are posed of three stages, including a buffer output which provides high noise immunity and stable output. The input structures tolerate voltages up to 5.5 V, allowing the interface of 5 V systems to 3 V systems.
The MC74VHCT125A output structures provide protection when VCC = 0 V. These output structures help prevent device destruction caused by supply voltage − input/output voltage mismatch, battery backup, hot insertion, etc.
