Overview
The SN74AHCT138PWRG4 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 where short propagation-delay times are crucial. It is part of the AHCT series, which is known for its high-speed and low-power consumption characteristics.
The device incorporates three enable inputs to simplify cascading and data reception, making it versatile for various system designs. It also features TTL-voltage compatible inputs and robust ESD protection, exceeding JESD 22 standards.
Key Specifications
| Parameter | Description | Unit | Min | Max | |
|---|---|---|---|---|---|
| VCC | Supply Voltage | V | 4.5 | 5 | 5.5 |
| TA | Operating Temperature Range | °C | -40 | 85 | |
| tPLH | Propagation Delay Time (A, B, C to Any Y) | ns | 7.6 | 10.4 | 12 |
| tPHL | Propagation Delay Time (A, B, C to Any Y) | ns | 7.6 | 10.4 | 12 |
| IOH | High-Level Output Current | mA | -50 | ||
| IOL | Low-Level Output Current | mA | 50 | ||
| RθJA | Junction-to-Ambient Thermal Resistance (TSSOP) | °C/W | 64 | ||
| ESD Protection | Human-Body Model | V | ±2000 |
Key Features
- Inputs are TTL-voltage compatible, ensuring compatibility with a wide range of logic systems.
- Designed specifically for high-speed memory decoders and data-transmission systems, optimizing performance in these applications.
- Incorporates three enable inputs (G1, G2A, G2B) to simplify cascading and data reception.
- Robust ESD protection exceeding JESD 22 standards: ±2000V human-body model and ±1000V charged-device model.
- Latch-up performance exceeds 250mA per JESD 17.
- Available in various packages including TSSOP, SOIC, SSOP, PDIP, and VQFN, offering flexibility in design and layout.
Applications
- High-performance memory decoding systems where fast decoding and minimal propagation delay are essential.
- Data-routing applications requiring high-speed and reliable signal transmission.
- Cascaded decoder systems where multiple decoders need to be connected in series.
- General-purpose logic circuits that require 3-line to 8-line decoding functionality.
Q & A
- What is the primary function of the SN74AHCT138PWRG4?
The primary function is to act as a 3-line to 8-line decoder/demultiplexer, converting 3-bit binary input into one of eight possible output lines.
- What are the key features of the SN74AHCT138PWRG4?
Key features include TTL-voltage compatible inputs, three enable inputs, robust ESD protection, and high-speed operation.
- What are the typical propagation delay times for this device?
The propagation delay times are typically around 7.6 to 10.4 ns for A, B, C to any Y output.
- What is the operating temperature range for the SN74AHCT138PWRG4?
The operating temperature range is from -40°C to 85°C.
- What types of packages are available for the SN74AHCT138PWRG4?
The device is available in TSSOP, SOIC, SSOP, PDIP, and VQFN packages.
- How does the SN74AHCT138PWRG4 protect against ESD?
The device has robust ESD protection exceeding JESD 22 standards: ±2000V human-body model and ±1000V charged-device model.
- What is the significance of the three enable inputs (G1, G2A, G2B)?
The three enable inputs simplify cascading and data reception, allowing for more complex decoder configurations.
- What are some common applications for the SN74AHCT138PWRG4?
Common applications include high-performance memory decoding systems, data-routing applications, and general-purpose logic circuits.
- How does the SN74AHCT138PWRG4 handle latch-up performance?
The device's latch-up performance exceeds 250mA per JESD 17.
- What is the junction-to-ambient thermal resistance for the TSSOP package?
The junction-to-ambient thermal resistance for the TSSOP package is approximately 64°C/W.
