74F538 1-of-8 Decoder/Demultiplexer IC with 3-State Outputs

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1 What is a Decoder/Demultiplexer Circuit?

The 74F538 IC is a part of the high speed 74F IC family. The 74F538 IC is a 1-of-8 decoder/demultiplexer that accepts three address (A0 – A2) input signals and decodes them to select one of eight mutually exclusive outputs. A Polarity control (P) input determines whether the outputs are active Low or active High. The 74F538 has 3-State outputs, and a High signal on the Output Enables (OEn) inputs will force all outputs to the high impedance state. Two active High (E2, E3) and two active Low (E0, E1) inputs are available for easy expansion to 1-of-32 decoding with four packages, or for data demultiplexing to 1-of-8 or 1-of-16 destinations. 74F538 IC has a wide range of working voltage, a wide range of working conditions, and directly interfaces with CMOS, NMOS, and TTL.

What is a Decoder/Demultiplexer Circuit?

A decoder/demultiplexer is a combinational logic circuit & an integral part of todays consumer scale electronics. It is designed to switch one common input line to one of several separate output lines. So, A demultiplexer converts a serial data signal at the input to a parallel data at its output lines.

74F538 Key Features & Specifications

Technology Family: F
Rating: Catalog
Output Polarity Control
Data Demultiplexing Capability
Multiple Enables for Expansion
Storage Temperature: −65°C to +150°C
Ambient Temperature under Bias: −55°C to +125°C
Junction Temperature under Bias: −55°C to +150°C
VCC Pin Potential to Ground Pin: −0.5V to +7.0V
Input Voltage: −0.5V to +7.0V
Input Current: −30 mA to +5.0 mA
Voltage Applied to Output in HIGH State (with VCC = 0V)
Standard Output Voltage: −0.5V to VCC
3-State Output Voltage: −0.5V to +5.5V
ESD Protection > 4000 Volts

74F538 Pinout

Pin No.	Pin Name	Description
1	O2	3-State Output Pin O2
2	O1	3-State Output Pin O1
3	O0	3-State Output Pin O0
4	OE1′	Active Low Output Enable Input OE1′
5	OE2′	Active Low Output Enable Input OE2′
6	A0	Address Input Pin A0
7	A1	Address Input Pin A1
8	O5	3-State Output Pin O5
9	O6	3-State Output Pin O6
10	GND	Ground Pin
11	O7	3-State Output Pin O7
12	P	Polarity Control Input Pin
13	E4	Enable Input Pin E4
14	E3	Enable Input Pin E3
15	E2′	Active Low Enable Input E2′
16	E1′	Active Low Enable Input E1′
17	A2	Address Input Pin A2
18	O4	3-State Output Pin O4
19	O3	3-State Output Pin O3
20	Vcc	Chip Supply Voltage

Applications

The 74F538 Decoder has a wide array of applications. Some of them are mentioned down below:

Usually used in electronic circuits to convert instructions into CPU control signals.
Also used for data transfer in logical circuits & testing equipment.