SN74AHC138DR

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SN74AHC138DR

IC DECODER/DEMUX 1X3:8 16SOIC

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Spécifications

Package Tape & Reel (TR),Cut Tape (CT)
Series 74AHC
ProductStatus Active
Type Decoder/Demultiplexer
Circuit 1 x 3:8
IndependentCircuits 1
Current-OutputHighLow 8mA, 8mA
VoltageSupplySource Single Supply
Voltage-Supply 2V ~ 5.5V
OperatingTemperature -40°C ~ 85°C
MountingType Surface Mount
Package/Case 16-SOIC (0.154, 3.90mm Width)

Vue d'ensemble

Description

The SN74AHC138DR is a high-speed, 3-to-8 line decoder/demultiplexer from Texas Instruments, designed for low-voltage logic applications. It features three binary inputs (A0, A1, A2) that decode into eight active low outputs (Y0 to Y7). The device is capable of handling a wide supply voltage range from 2V to 5.5V, making it suitable for various digital circuits.
It includes enable inputs (G1, G2A, G2B) that control the operation of the decoder, allowing for flexible usage in larger systems. The SN74AHC138DR is characterized by low power consumption and high speed, with a typical propagation delay of around 5 ns at 5V, making it ideal for high-frequency applications.
The chip is available in a standard SOIC-16 package, facilitating integration into compact designs. Overall, the SN74AHC138DR is widely used in data routing, memory address decoding, and as a signal demultiplexer in complex digital systems.

Features

The SN74AHC138DR is a high-speed CMOS 3-to-8 line decoder/demultiplexer featuring:
1. Three Input Lines: Accepts three binary inputs (A0, A1, A2) to decode into eight unique outputs.
2. Active Low Outputs: Eight outputs (Y0 to Y7) that are active low, meaning the selected output is pulled low while all others remain high.
3. Enable Inputs: Two enable (G1, G2A, G2B) inputs allow control over the activation of the decoder, enabling or disabling the output when needed.
4. High-Speed Operation: Supports fast switching times in the range of 2 ns at 5V, facilitating high-speed applications.
5. Wide Voltage Range: Operates with a supply voltage range from 2V to 6V, suitable for various digital circuits.
6. Low Power Consumption: Offers low static power consumption, making it ideal for battery-operated devices.
7. Standard Logic Levels: Compatible with standard TTL inputs and outputs for easy integration into existing systems.
This versatile IC is widely used in memory address decoding, data routing, and control signal generation.

Package

The SN74AHC138DR is packaged in a SOIC-14 (Small Outline Integrated Circuit) format. This surface-mount package is designed for efficient space utilization and offers improved performance in terms of electrical characteristics compared to through-hole packages.

Pinout

The SN74AHC138DR is a 3-to-8 line decoder/demultiplexer with a total of 16 pins. Its primary function is to decode a 3-bit binary input into one of eight active low outputs.
Pin Count and Functions:
- Inputs:
- A0, A1, A2 (Pins 2, 1, 3): These are the binary input pins.

- Enable Inputs:
- G1 (Pin 4): Active high enable.
- G2A (Pin 5), G2B (Pin 6): Active low enables (both must be low to enable decoding).
- Outputs:
- Y0 to Y7 (Pins 15, 14, 13, 12, 11, 10, 9, 8): Eight active low output lines that indicate which input combination is selected.
- Power and Ground:
- VCC (Pin 16): Power supply pin.
- GND (Pin 8): Ground pin.
This device allows for efficient decoding of binary information and can be used in various digital applications.

Manufacturer

The SN74AHC138DR is manufactured by Texas Instruments (TI), a multinational semiconductor company based in the United States. Texas Instruments specializes in designing and manufacturing a broad range of analog and digital semiconductor devices, including microcontrollers, processors, and various types of integrated circuits. The company is known for its innovation in the field of electronics and has a significant presence in markets such as automotive, industrial, communications, and consumer electronics. TI also focuses on providing solutions for embedded systems, signal processing, and power management, making it a key player in the global semiconductor industry.

Application

The SN74AHC138DR is a 3-to-8 line decoder/demultiplexer used in various applications, including memory address decoding, data routing in communication systems, and selection of devices in digital circuits. It can facilitate complex logic functions, enable multiple data pathways, and enhance circuit efficiency in microcontroller systems, programmable logic devices, and digital signal processing. Additionally, it is effectively employed in fan-out applications and to drive multiple outputs with minimal input lines.

Equivalent

Equivalent products to the SN74AHC138DR include the 74HC138, 74AHCT138, 74HCT138, and 74AC138. These chips are all 3-to-8 line decoders/demultiplexers with similar functionality, but may differ in voltage levels, speed, and power consumption. Always check specific datasheets for detailed compatibility.

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