74ACT11194
4-BIT BIDIRECTIONAL UNIVERSAL SHIFT REGISTER

SCAS094 - NOVEMBER 1989 - REVISED APRIL 1993

Copyright © 1992, Texas Instruments Incorporated

features

• Inputs Are TTL-Voltage Compatible
• Parallel-to-Serial, Serial-to-Parallel Conversions
• Left or Right Shifts
• Parallel Synchronous Loading
• Direct Overriding Clear
• Temporary Data Latching Capability
• Center-Pin V_CC and GND Configurations Minimize High-Speed Switching Noise
• EPIC^TM (Enhanced-Performance Implanted CMOS) 1-m Process
• 500-mA Typical Latch-Up Immunity at 125°C
• Package Options Include Plastic Small-Outline Packages and Standard Plastic 300-mil DIPs

  EPIC is a trademark of Texas Instruments Incorporated.

description

This bidirectional shift register features parallel outputs, right-shift and left-shift serial inputs, operating-mode-control inputs, and a direct overriding clear line. The register has four distinct modes of operation, namely:

• Parallel (broadside) load
• Shift right (in the direction Q_A toward Q_D)
• Shift left (in the direction Q_D toward Q_A)
• Inhibit clocking (do nothing).

Synchronous parallel loading is accomplished by applying the 4 bits of data and taking both mode control inputs, S0 and S1, high. The data are loaded into the associated flip-flops and appear at the outputs after the positive transition of the clock input. During loading, serial data flow is inhibited.

Shift right is accomplished synchronously with the rising edge of the clock pulse when S0 is high and S1 is low. Serial data for this mode is entered at the shift-right data input. When S0 is low and S1 is high, data shifts left synchronously and new data is entered at the shift-left serial inputs. Clocking of the flip-flop is inhibited when both mode control inputs are low.

The 74ACT11194 is characterized for operation from - 40°C to 85°C.