74LS168-Synch Decade Up/Down Counter

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 74LS168 is a fully synchronous 4-stage up/down counter featuring a preset capability for programmable operation, carry lookahead for easy cascading, and a U/D input to control the direction of counting.

74LS168 Features

• Low Power Dissipation 100 mW Typical
• High-Speed Count Frequency 30 MHz Typical
• Fully Synchronous Operation
• Full Carry Lookahead for Easy Cascading
• Single Up/Down Control Input
• Positive Edge-Trigger Operation

74LS168 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

74LS168 Pinout Diagram

74LS168 Pin Description

Pin No	Pin Name	Description
1	U/D	Up-Down Count Control Input
2	CP	Clock Pulse (Active positive-going edge) Input
3	P0	Parallel Data Input Of Counter 0
4	P1	Parallel Data Input Of Counter 1
5	P2	Parallel Data Input Of Counter 2
6	P3	Parallel Data Input Of Counter 3
7	CEP	Count Enable Parallel (Active LOW) Input
8	GND	Ground
9	PE’	Parallel Enable (Active LOW) Input
10	CET’	Count Enable Trickle (Active LOW) Input
11	Q3	Counter Output Q3
12	Q2	Counter Output Q2
13	Q1	Counter Output Q1
14	Q0	Counter Output Q0
15	TC’	Terminal Count (Active LOW) Output
16	VCC	Positive Supply

Applications

• Clock generation
• Clock division
• Integrated oscillator
• Low power CMOS
• TTL compatible inputs
• In frequency counting circuits

74LS168 Alternative Equivalent

74LS169

Download 74LS168-Synch Decade Up/Down Counter Datasheet from the link given below.