Overview
The SN74HC138NSR, produced by Texas Instruments, is a 3-Line to 8-Line Decoder/Demultiplexer. 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 HC (High-Speed CMOS) logic family, known for its wide operating voltage range and low power consumption.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | 5 | 6 | V |
| VIH High-Level Input Voltage (VCC = 6 V) | 4.2 | V | ||
| VIL Low-Level Input Voltage (VCC = 6 V) | 1.8 | V | ||
| IO Continuous Output Current | ±25 | mA | ||
| TJ Junction Temperature | 150 | °C | ||
| TA Operating Free-Air Temperature | -40 | 125 | °C | |
| tpd Propagation Delay Time (VCC = 6 V) | 15 | 31 | 46 | ns |
| ICC Power Consumption (Max) | 80 | µA |
Key Features
- Wide operating voltage range: 2 V to 6 V
- Low power consumption: 80-µA maximum ICC
- Typical propagation delay time: 15 ns at VCC = 6 V
- Outputs can drive up to 10 LSTTL loads
- ±4-mA output drive at 5 V
- Low input current: 1-µA maximum
- Active low outputs: Selected output is low
- 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 SN74HC138NSR? The SN74HC138NSR 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 SN74HC138NSR? The operating voltage range is from 2 V to 6 V.
- What is the typical propagation delay time of the SN74HC138NSR at 6 V? The typical propagation delay time is 15 ns.
- How many LSTTL loads can the outputs of the SN74HC138NSR drive? The outputs can drive up to 10 LSTTL loads.
- What is the maximum power consumption of the SN74HC138NSR? The maximum power consumption is 80 µA.
- What type of outputs does the SN74HC138NSR have? The SN74HC138NSR has active low outputs.
- How many enable inputs does the SN74HC138NSR have? The device has three enable inputs.
- What are some common applications of the SN74HC138NSR? Common applications include LED displays, servers, white goods, power infrastructure, building automation, and factory automation.
- Is the SN74HC138NSR qualified for automotive applications? Yes, the SN74HC138-Q1 version is qualified for automotive applications and has ESD protection exceeding 2000 V per MIL-STD-883, Method 3015.
- What is the junction temperature range for the SN74HC138NSR? The junction temperature range is up to 150 °C.
