74LS194AP-E

Overview

The 74LS194AP-E is a 4-bit bidirectional universal shift register manufactured by Renesas Electronics Corporation. It belongs to the standard 74LS logic family, operating at a supply voltage of 4.75V to 5.25V. The device features parallel input and output capabilities alongside serial shifting in both directions. It includes synchronous parallel loading, mode control inputs for direction selection, and a direct asynchronous clear line. The component is housed in a 16-pin DIP package.

Feature Summary

• Supports bidirectional data shifting with selectable left or right modes via control inputs
• Enables synchronous parallel data loading into all four bits simultaneously
• Includes an asynchronous clear function to reset outputs independently of the clock signal

Applications

• Data storage and temporary holding in digital systems
• Serial-to-parallel and parallel-to-serial data conversion circuits
• Implementation of arithmetic logic units requiring shift operations

Procurement Notes

Verify the manufacturer marking on the component body to confirm it originates from Renesas Electronics Corporation rather than other legacy producers such as Texas Instruments or Motorola. Ensure the part number suffix matches the specific package variant required for your PCB layout. Cross-reference the datasheet revision date to ensure compatibility with current design standards.

Selection Notes

Select this component when a bidirectional shift register with parallel load capability is required within a standard TTL logic environment. It is suitable for designs needing moderate speed performance with low power consumption typical of the LS series. Consider pinout compatibility if replacing older equivalents from different manufacturers.

Part Context

This component is part of the widely adopted 74LS194 family of shift registers. It serves as a fundamental building block for sequential logic circuits. The LS designation indicates Low-power Schottky technology, offering a balance between speed and power efficiency compared to standard TTL variants.

Replacement Considerations

Direct substitutes include SN74LS194AD from Texas Instruments and MC74LS194P from ON Semiconductor. Verify that any replacement maintains the same 16-pin DIP footprint and logical functionality.