74LS195 4-bit Parallel-Access 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. The 74LS195A is a high-speed 4-Bit Shift Register offering typical shift frequencies of 39 MHz. It is useful for a wide variety of registering and counting applications

74LS195 Features

• Synchronous Serial or Parallel Data Transfers
• Asynchronous Master Reset
• High Speed up to 39MHz
• Input Clamping Diodes
• Standard TTL Switching Voltages

74LS195 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

74LS195 Pinout Diagram

74LS195 Pin Description

Pin No	Pin Name	Description
1	MR	Master Reset (Active LOW) Input
2	J	First Stage J (Active HIGH) Input
3	K	First Stage K (Active LOW) Input
4	P0	Parallel Data Input
5	P1	Parallel Data Input
6	P2	Parallel Data Input
7	P3	Parallel Data Input
8	GND	Ground
9	PE’	Parallel Enable (Active LOW) Input
10	CP	Clock (Active HIGH Going Edge) Input
11	Q3′	Complementary Last Stage Output
12	Q3	Parallel Output
13	Q2	Parallel Output
14	Q1	Parallel Output
15	Q0	Parallel Output
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.

74LS195 Alternative Equivalent

Download the 74LS195 4-bit Parallel-Access Shift Register Datasheet from the link given below.