MC74VHCT125A

The MC74VHCT125A is a high speed CMOS quad bus buffer fabricated with silicon gate CMOS technology. It achieves high speed operation similar to equivalent Bipolar Schottky TTL while maintaining CMOS low power dissipation.

The MC74VHCT125A requires the 3state control input (OE) to be set High to place the output into the high impedance state. The VHCT inputs are compatible with TTL levels. This device can be used as a level converter for interfacing 3.3V to 5.0V, because it has full 5V CMOS level output swings.

The VHCT125A input structures provide protection when voltages between 0V and 5.5V are applied, regardless of the supply voltage. The output structures of MC74VHCT125A also provide protection when VCC = 0V. These input and output structures of MC74VHCT125A help prevent device destruction caused by supply voltage input/output voltage mismatch, battery backup, hot insertion, etc.

The internal circuit is composed of three stages of MC74VHCT125A, including a buffer output which provides high noise immunity and stable output. The inputs tolerate voltages up to 7V, allowing the interface of 5V systems to 3V systems.