Overview
The SN74AHC138D 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 short propagation-delay times. It is part of the 74AHC series, known for its advanced high-speed CMOS (AHC) technology, which offers low power consumption and high speed.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | 5.5 | V | |
| VI Input Voltage | 0 | 5.5 | V | |
| VO Output Voltage | 0 | VCC + 0.5 | V | |
| Operating Temperature | -40 | 85 | °C | |
| tPLH Propagation Delay (A, B, C to Y) | 5.7 | 8.1 | 9.5 | ns (CL = 15 pF) |
| tPHL Propagation Delay (A, B, C to Y) | 5.7 | 8.1 | 9.5 | ns (CL = 15 pF) |
| IOH High-Level Output Current | -50 | mA (VCC = 2 V) | ||
| IOL Low-Level Output Current | 50 | mA (VCC = 2 V) | ||
| Package Type | 16-SOIC |
Key Features
- Operating range: 2V to 5.5V VCC, making it versatile for various power supply conditions.
- Designed specifically for high-speed memory decoders and data-transmission systems, minimizing system decoding delays.
- Incorporates 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.
- Low power consumption and high speed due to advanced high-speed CMOS (AHC) technology.
Applications
The SN74AHC138D is suitable for a variety of high-performance applications, including:
- Memory-decoding systems where fast access times are critical.
- Data-routing systems that require minimal propagation delays.
- High-speed digital circuits in computing and telecommunications equipment.
- Embedded systems and microcontrollers requiring efficient data handling.
Q & A
- What is the primary function of the SN74AHC138D?
The SN74AHC138D 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 SN74AHC138D?
The operating voltage range is from 2V to 5.5V.
- What types of packages are available for the SN74AHC138D?
The component is available in several packages, including 16-SOIC, PDIP, TSSOP, SSOP, and TVSOP among others.
- What are the propagation delay times for the SN74AHC138D?
The propagation delay times range from 5.7 ns to 9.5 ns for CL = 15 pF.
- Does the SN74AHC138D have ESD protection?
Yes, it has ESD protection exceeding JESD 22 standards: 2000V Human-Body Model and 1000V Charged-Device Model.
- What is the maximum output current of the SN74AHC138D?
The maximum continuous output current is ±25 mA.
- What is the operating temperature range of the SN74AHC138D?
The operating temperature range is from -40°C to 85°C.
- How many enable inputs does the SN74AHC138D have?
The component has three enable inputs.
- Is the SN74AHC138D RoHS compliant?
Yes, the SN74AHC138D is RoHS compliant.
- What is the typical power dissipation capacitance of the SN74AHC138D?
The typical power dissipation capacitance is 13 pF at no load and f = 1 MHz.
