74LS194 4-bit Bi-directional Shift Register

The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. 74LS194 the bidirectional shift register is designed to incorporate virtually all of the features a system designer may want in a shift register; they feature parallel inputs, parallel outputs, right-shift, and left-shift serial inputs, operating-mode-control inputs, and a direct overriding clear line

74LS194 Features

• Parallel Inputs and Outputs
• Four Operating Modes, Synchronous, Right Shift, Left Shift and Pause
• High Speed up to 25MHz
• Positive Edge Triggered Clocking
• Standard TTL Switching Voltages

74LS194 Specifications

Supply Voltage	4.75 – 5.25Vdc
Maximum Clock Frequency	40Mhz
Power Dissipation	2mW/gate @100kHz
Minimum Output Current	8mA
Propagation Delay	10nS
Fan Out (TTL Loads)	20

74LS194 Pinout Diagram

74LS194 Pin Description

Pin No	Pin Name	Description
1	CLR’	Clear Pin
2	SR SER	Shift Right Serial Input
3	A	Parallel Input
4	B	Parallel Input
5	C	Parallel Input
6	D	Parallel Input
7	SL SER	Shift Left Serial Input
8	GND	Ground
9	S0	Serial Pin
10	S1	Serial Pin
11	CLK	Clock Pin
12	QD	Output Pin
13	QC	Output Pin
14	QB	Output Pin
15	QA	Output Pin
16	VCC	Positive Supply

Applications

• The shift registers are used for temporary data storage.
• The shift registers are also used for data transfer and data manipulation.
• The serial-in serial-out and parallel-in parallel-out shift registers are used to produce time delay to digital circuits.

74LS194 Alternative Equivalent

Download 74LS194 4-bit Bi-directional Shift Register Datasheet from the link given below.