MC74AC194/74ACT194 is a high-speed 4-bit bidirectional universal shift register. As a high-speed multifunctional, sequential building block, it is useful in a wide variety of applications. It may be used in serial-serial, shift left, shift right, serial-parallel, parallel-serial, and parallel-parallel data register transfers. The ′AC/ACT194 is similar in operation to the ′AS195 universal shift register, with added features of shift left without external connections and hold (do nothing) modes of operation.
This document is a technical datasheet for the Motorola MG74AC/74ACT194 series of high-speed 4-bit bidirectional universal shift registers. These devices function as sequential building blocks capable of serial-serial, shift left/right, serial-parallel, parallel-serial, and parallel-parallel data transfers. Key features include a typical shift frequency of 150 MHz, asynchronous master reset, and hold (do nothing) modes.
| Typical Shift Frequency | 150 MHz |
|---|---|
| Supply Voltage (ACT) | 4.5 to 5.5 V |
| Operating Temperature Range | -40 to +85 °C |
The device supports reset, hold, shift left, shift right, and parallel load operations.
A LOW signal on Master Reset overrides all other inputs and forces the outputs LOW.