Overview
The SN74AHC138DRG4 is a 3-line to 8-line decoder/demultiplexer produced by Texas Instruments. This device is designed for high-performance memory-decoding and data-routing applications, particularly where very short propagation-delay times are crucial. It operates within a voltage range of 2V to 5.5V, making it versatile for various system designs. The SN74AHC138DRG4 is part of the AHC (Advanced High-Speed CMOS) logic family, known for its high speed and low power consumption.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | 5.5 | V | |
| VIH High-Level Input Voltage (VCC = 5.5V) | 3.85 | V | ||
| VIL Low-Level Input Voltage (VCC = 5.5V) | 1.65 | V | ||
| IOH High-Level Output Current (VCC = 5V) | -8 | mA | ||
| IOL Low-Level Output Current (VCC = 5V) | 8 | mA | ||
| Ta Operating Free-Air Temperature | -40 | 85 | °C | |
| tPLH Propagation Delay Time (VCC = 5V, CL = 15pF) | 5.7 | 8.1 | 9.5 | ns |
| tPHL Propagation Delay Time (VCC = 5V, CL = 15pF) | 5.7 | 8.1 | 9.5 | ns |
Key Features
- Operating range: 2V to 5.5V VCC
- Designed specifically for high-speed memory decoders and data-transmission systems
- Incorporate three enable inputs to simplify cascading and/or data reception
- Latch-up performance exceeds 250mA per JESD 17
- ESD protection exceeds JESD 22: 2000V Human-Body Model and 1000V Charged-Device Model
- High-speed propagation delay times, typically less than 10 ns
- Low power consumption
Applications
The SN74AHC138DRG4 is suitable for various high-performance applications, including:
- Memory decoding in high-speed memory systems
- Data routing and demultiplexing in digital systems
- Cascaded decoding schemes for larger memory addresses
- High-speed data transmission systems requiring minimal delay times
Q & A
- What is the operating voltage range of the SN74AHC138DRG4?
The operating voltage range is from 2V to 5.5V.
- What is the typical propagation delay time for the SN74AHC138DRG4?
The typical propagation delay time is around 8.1 ns for VCC = 5V and CL = 15pF.
- Does the SN74AHC138DRG4 have ESD protection?
- What are the enable inputs used for in the SN74AHC138DRG4?
The three enable inputs simplify cascading and/or data reception.
- What is the maximum continuous output current for the SN74AHC138DRG4?
The maximum continuous output current is ±25 mA.
- What are the typical applications of the SN74AHC138DRG4?
It is used in high-speed memory decoding, data routing, and demultiplexing in digital systems.
- What is the operating temperature range for the SN74AHC138DRG4?
The operating temperature range is from -40°C to 85°C.
- How many output lines does the SN74AHC138DRG4 have?
The device has 8 output lines.
- What is the package type for the SN74AHC138DRG4?
The package type is VQFN (RGY) with 16 pins.
- Does the SN74AHC138DRG4 have latch-up protection?
