74F579 Octal 8-Bit Bidirectional Binary Counter IC with 3-State Outputs

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The 74F579 IC is a part of the high-speed 74F family. 74F579 IC is a fully synchronous 8-stage Up/Down Counter with multiplexed 3-State I/O ports for bus-oriented applications. It features a preset capability for programmable operation, carries a look-ahead for easy cascading, and a U/D’ input to control the direction of counting. All state changes, whether in counting or parallel loading, are initiated by the rising edge of the clock. The 74F579 IC offers a wide range of features including thermal overload & ESD protection, which makes it suitable to be deployed in high speed, low-noise environment.

What is a Binary Counter?

A Binary Counter is a digital counter that counts 10 digits. It resets for every new clock input. As it can go through 10 unique combinations of output, therefore it is also called a “Decade counter”. A binary counter can count 0000, 0001, 0010, 1000, 1001, 1010, 1011, 1110, 1111, 0000, and 0001 and so on.

74F579 Pinout

Pin No.	Pin Name	Description
1	CP	Clock Pulse Inut
2	(I/O)0	Data (I/O) Pin 0
3	(I/O)1	Data (I/O) Pin 1
4	(I/O)2	Data (I/O) Pin 2
5	(I/O)3	Data (I/O) Pin 3
6	GND	Ground Pin
7	(I/O)4	Data (I/O) Pin 4
8	(I/O)5	Data (I/O) Pin 5
9	(I/O)6	Data (I/O) Pin 6
10	(I/O)7	Data (I/O) Pin 7
11	OE’	Active Low Output Enable Input
12	CS’	Active Low Chip Select input
13	PE’	Active Low Parallel Enable Input
14	U/D’	Up/Down count control input
15	TC’	Active Low Terminal Count Output
16	Vcc	Chip Supply Voltage
17	CET’	Active Low Count Enable Trickle input
18	CEP’	Active Low Count Enable Parallel input
19	SR’	Active Low Synchronous Reset input
20	MR’	Active Low Master Reset input