Overview
The SN74AHC138DBR is a 3-line to 8-line decoder/demultiplexer produced by Texas Instruments. This component is designed for high-performance memory-decoding and data-routing applications, particularly in systems that require very short propagation-delay times. It is part of the AHC (Advanced High-Speed CMOS) family, known for its high speed and low power consumption.
The device features three enable inputs to simplify cascading and data reception, making it highly versatile in various digital circuit designs. It operates over a voltage range of 2V to 5.5V, making it compatible with a wide range of system designs.
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 | ||
| 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 |
| TA Operating Free-Air Temperature | -40 | 85 | °C | |
| Package Type | SSOP (DB) | |||
| Package Size | 6.2 mm x 7.8 mm |
Key Features
- Operating voltage range: 2V to 5.5V
- Designed for high-speed memory decoders and data-transmission systems
- Three enable inputs to simplify cascading and data reception
- Latch-up performance exceeds 250mA per JESD 17
- ESD protection exceeds JESD 22: 2000V Human-Body Model and 1000V Charged-Device Model
- Low propagation delay times, typically 5.7ns to 9.5ns at VCC = 5V
- Available in various package types including SSOP, SOIC, TSSOP, and VQFN
Applications
The SN74AHC138DBR is suitable for a variety of high-performance digital applications, including:
- Memory decoding in high-speed memory systems
- Data routing and demultiplexing in digital circuits
- 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 SN74AHC138DBR?
The operating voltage range is 2V to 5.5V.
- What are the key applications of the SN74AHC138DBR?
It is used in high-speed memory decoding, data routing, and demultiplexing in digital circuits.
- What is the typical propagation delay time of the SN74AHC138DBR at VCC = 5V?
The typical propagation delay time is between 5.7ns and 9.5ns.
- What type of ESD protection does the SN74AHC138DBR offer?
It offers ESD protection exceeding 2000V Human-Body Model and 1000V Charged-Device Model.
- What are the package options available for the SN74AHC138DBR?
It is available in SSOP, SOIC, TSSOP, and VQFN packages.
- What is the operating temperature range of the SN74AHC138DBR?
The operating temperature range is -40°C to 85°C.
- How many enable inputs does the SN74AHC138DBR have?
It has three enable inputs.
- What is the maximum continuous output current of the SN74AHC138DBR?
The maximum continuous output current is ±25 mA.
- What is the latch-up performance of the SN74AHC138DBR?
The latch-up performance exceeds 250mA per JESD 17.
- Can the SN74AHC138DBR be used in cascaded decoding schemes?
Yes, it can be used in cascaded decoding schemes due to its three enable inputs.
