Overview
The SN74HC138NS is a 3-line to 8-line decoder/demultiplexer integrated circuit produced by Texas Instruments. This device is specifically designed for high-performance memory-decoding and data-routing applications that require very short propagation delay times. It is part of the 74HC series, known for its high-speed and low power consumption characteristics.
The SN74HC138NS can be used in a variety of applications where fast decoding and demultiplexing are essential, making it a versatile component in modern electronic systems.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | Small Outline (SO) 16-pin | 10.20 mm x 5.30 mm |
| Number of Inputs | 3 binary inputs (A, B, C) | - |
| Number of Outputs | 8 active-low outputs | - |
| Operating Voltage Range | 2 V to 6 V | - |
| Propagation Delay | Typical tpd = 15 ns | - |
| Output Drive | ±4-mA at 5 V | - |
| Input Current | Maximum 1-µA | - |
| Power Consumption | Maximum ICC = 80 µA | - |
| Enable Inputs | One active high and two active low enable pins | - |
| Junction Temperature | -40°C to 85°C | - |
Key Features
- Targeted specifically for high-speed memory decoders and data-transmission systems.
- Wide operating voltage range from 2 V to 6 V.
- Outputs can drive up to 10 LSTTL loads.
- Low power consumption with a maximum ICC of 80 µA.
- Typical propagation delay of 15 ns.
- ±4-mA output drive at 5 V.
- Low input current of 1-µA maximum.
- Active low outputs (selected output is low).
- Incorporates three enable inputs to simplify cascading or data reception.
Applications
- LED displays.
- Servers.
- White goods.
- Power infrastructure.
- Building automation.
- Factory automation.
Q & A
- What is the primary function of the SN74HC138NS?
The SN74HC138NS is a 3-line to 8-line decoder/demultiplexer, designed for high-performance memory-decoding and data-routing applications.
- What is the operating voltage range of the SN74HC138NS?
The operating voltage range is from 2 V to 6 V.
- How many outputs does the SN74HC138NS have?
The device has 8 active-low outputs.
- What is the typical propagation delay of the SN74HC138NS?
The typical propagation delay is 15 ns.
- Can the SN74HC138NS drive multiple LSTTL loads?
Yes, the outputs can drive up to 10 LSTTL loads.
- What is the maximum power consumption of the SN74HC138NS?
The maximum power consumption (ICC) is 80 µA.
- How many enable inputs does the SN74HC138NS have?
The device has one active high and two active low enable inputs.
- What are the typical applications of the SN74HC138NS?
Typical applications include LED displays, servers, white goods, power infrastructure, building automation, and factory automation.
- What is the junction temperature range for the SN74HC138NS?
The junction temperature range is from -40°C to 85°C.
- What package types are available for the SN74HC138NS?
The device is available in a 16-pin Small Outline (SO) package.
