Dual 2-to-4 line Decoder/Demultiplexer IC - 74HC139
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Dual 2-to-4 line Decoder/Demultiplexer IC - 74HC139 The 74HC Series 74HC139 comprises two separate two-line-to-four-line decoders in a single package. The active-low enable input can be used as a data line in demultiplexing applications. All of these decoders/demultiplexers feature fully buffered inputs, presenting only one normalized load to its driving circuit. All inputs are clamped with high-performance Schottky diodes to suppress line-ringing and simplify system design. These Schottky-clamped circuits are designed to be used in high-performance memory-decoding or data-routing applications, requiring very short propagation delay times. In high-performance memory systems, these decoders can be used to minimize the effects of system decoding. When used with high-speed memories, the delay times of these decoders are usually less than the typical access time of the memory. This means that the effective system delay introduced by the decoder is negligible. Pinout: Pinout Of 74HC139 IC Symbol Pin Description 1E, 2E 1, 15 enable input (active LOW) 1A0, 1A1 2, 3 address input 1Y0, 1Y1, 1Y2, 1Y3 4, 5, 6, 7 output (active LOW) GND 8 ground (0 V) 2Y0, 2Y1, 2Y2, 2Y3 12, 11, 10, 9 output (active LOW) 2A0, 2A1 14, 13 address input VCC 16 positive supply voltage Also check 4 Bit D-Latch 74LS75 IC . It's a small, 16-pin integrated circuit (IC) chip that stores 4 bits of digital data. It's commonly used in digital circuits for data storage, timing control, and logic functions.
- Dual 2-to-4 line decoder/demultiplexer in a single IC
- Active-low enable and output signals
- Schottky-clamped inputs for reduced ringing and fast switching
- Fully buffered inputs – low loading on driving circuits
- 16-pin DIP package for breadboard and PCB use
- Compatible with TTL and CMOS logic levels
- Ideal for memory decoding, data routing, and logic control
- Two independent decoders in one IC
- Low power consumption
- High noise immunity
- Fast switching speed
- Suitable for breadboard prototyping
- Widely used in educational and industrial applications
| Supply Voltage (VCC) | 7 V |
|---|---|
| Input Voltage (VI) | 7 V |
| Operating free-air temperature range | 0°C to +70°C |
| Storage temperature range | –65°C to +150°C |
What is the function of the 74HC139 IC?
The 74HC139 is a dual 2-to-4 line decoder/demultiplexer that converts 2-bit binary inputs into one of four active-low outputs, useful for memory decoding and data routing.
Is the 74HC139 compatible with Arduino and Raspberry Pi?
Yes, the 74HC139 is CMOS/TTL compatible and works seamlessly with 5V and 3.3V logic levels used in Arduino and Raspberry Pi projects.
What is the pin configuration of the 74HC139?
The 74HC139 has 16 pins: two enable inputs (1E, 2E), four address inputs (1A0, 1A1, 2A0, 2A1), eight active-low outputs (1Y0–1Y3, 2Y0–2Y3), VCC (16), and GND (8).
Can the 74HC139 be used in high-speed memory systems?
Yes, its low propagation delay makes it ideal for high-speed memory decoding, where the delay is typically less than the memory access time.
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