74LS164 8-bit Serial 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. 74LS164 8-bit shift registers feature gated serial inputs and an asynchronous clear. The gated serial inputs (A and B) permit complete control over incoming data as a low at either input inhibits entry of the new data and resets the first flip-flop to the low level at the next clock pulse.

74LS164 Features

• Single 8-bit Shift Register with Gated Serial Inputs and Asynchronous Clear
• Fully Buffered Clock
• Clock Frequency up to 36MHz
• Operating Temperature up to 70°C
• Standard TTL Switching Voltages

74LS164 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

74LS164 Pinout Diagram

74LS164 Pin Description

Pin No	Pin Name	Description
1	A	Serial Input Pin
2	B	Serial Input Pin
3	Q0	Serial Output
4	Q1	Serial Output
5	Q2	Serial Output
6	Q3	Serial Output
7	GND	Ground
8	CP	Clear Pin
9	MR’	Master Reset (Active Low)
10	Q4	Serial Output
11	Q5	Serial Output
12	Q6	Serial Output
13	Q7	Serial Output
14	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.

74LS164 Alternative Equivalent

74LS165, 74LS166

Download the 74LS164 8-bit Serial Shift Register Datasheet from the link given below.