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SN74HCT138DR

Name: SN74HCT138DR
Rating: 4.7 (12 reviews)

IC DECODER/DEMUX 1X3:8 16SOIC

製造商
製造商。部分 #SN74HCT138DR
包 16-SOIC (0.154, 3.90mm Width)
資料表 SN74HCT138DR DataSheet
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規格

Package	Tape & Reel (TR),Cut Tape (CT)
Series	74HCT
ProductStatus	Active
Type	Decoder/Demultiplexer
Circuit	1 x 3:8
IndependentCircuits	1
Current-OutputHighLow	4mA, 4mA
VoltageSupplySource	Single Supply
Voltage-Supply	4.5V ~ 5.5V
OperatingTemperature	-40°C ~ 85°C
MountingType	Surface Mount
Package/Case	16-SOIC (0.154, 3.90mm Width)

概述

Description

The SN74HCT138DR is a high-speed CMOS 3-to-8 line decoder/demultiplexer. It converts a 3-bit binary input (A0, A1, A2) into one of eight active low outputs (Y0 to Y7). Designed to operate with TTL input levels, it features a fast propagation delay, typically around 15 ns, making it suitable for high-speed applications.
The device has three enable inputs (G1, G2A, G2B) that allow for easy control over its operation. When enabled, the selected output corresponds to the binary value of the inputs, while all other outputs remain inactive. The SN74HCT138DR is available in a small TSSOP package, making it ideal for compact designs.
It operates within a wide voltage range (4.5V to 5.5V) and is often used in applications like memory decoding, data routing, and signal demultiplexing in digital circuits. Its compatibility with both TTL and CMOS makes it versatile for various electronic designs.

Features

The SN74HCT138DR is a high-speed CMOS 3-to-8 line decoder/demultiplexer with the following features:
1. 3-to-8 Line Decoding: It converts 3 binary inputs into 8 mutually exclusive outputs.
2. Active Low Outputs: Outputs are active low, meaning that the selected output is pulled low while others are high.
3. High-Speed Operation: Offers fast switching speeds, typically around 7 ns at 5V.
4. Wide Supply Voltage Range: Operates typically from 4.5V to 5.5V.
5. Low Power Consumption: Consumes low static and dynamic power.
6. Three Enable Inputs: Provides additional control with three enable signals (G1, G2A, G2B) for flexible operation.
7. TTL Compatibility: Designed to be compatible with TTL logic levels, making it suitable for interfacing with TTL devices.
8. Package Type: Available in a 16-pin TSSOP (DR) package for compact applications.
These features make the SN74HCT138DR suitable for various digital applications such as memory address decoding and data routing.

Package

The SN74HCT138DR is packaged in a surface-mount SOIC (Small Outline Integrated Circuit) with 16 pins. The "DR" suffix indicates it's a tape and reel package, suitable for automated assembly.

Pinout

The SN74HCT138DR is a 3-to-8 line decoder/demultiplexer. It has a total of 16 pins. The pin functions are as follows:
1. A0 (Pin 1): Input 0
2. A1 (Pin 2): Input 1
3. A2 (Pin 3): Input 2
4. G1 (Pin 4): Enable input (active HIGH)
5. G2A (Pin 5): Enable input (active LOW)
6. G2B (Pin 6): Enable input (active LOW)
7. Y0 (Pin 7): Output 0
8. Y1 (Pin 8): Output 1
9. Y2 (Pin 9): Output 2
10. Y3 (Pin 10): Output 3
11. Y4 (Pin 11): Output 4
12. Y5 (Pin 12): Output 5
13. Y6 (Pin 13): Output 6
14. Y7 (Pin 14): Output 7
15. VCC (Pin 15): Power supply
16. GND (Pin 16): Ground
The device selects one of the eight outputs based on the 3 input lines, provided the enable conditions are met.

Manufacturer

The SN74HCT138DR is manufactured by Texas Instruments (TI), a leading American technology company. Founded in 1930, Texas Instruments specializes in designing and producing semiconductors and various integrated circuits. The company is renowned for its innovation in analog and digital signal processing, as well as its role in developing technology for a wide range of applications, including automotive, industrial, personal electronics, telecommunications, and consumer products. TI is also well-known for its educational initiatives and contributions to the engineering community. The SN74HCT138DR itself is a 3-to-8 line decoder/demultiplexer, commonly used in digital applications for data routing and logic functions.

Application

The SN74HCT138DR is a 3-to-8 line decoder/demultiplexer used in various applications such as memory address decoding, data routing, and circuit simplification. It's commonly employed in digital circuit design, microprocessor interfacing, and as a binary to decimal decoder in electronic systems. Its high-speed operation and low power consumption make it suitable for consumer electronics, automotive systems, and communication devices.

Equivalent

Equivalent products to the SN74HCT138DR include the 74HC138, 74LS138, and 74HCT138. These are all 3-to-8 line decoders/demultiplexers. Ensure compatibility with your specific application regarding voltage levels and power supply requirements.