Overview
The Texas Instruments SN74HCT138DRG4 is a high-performance 3-line to 8-line decoder/demultiplexer designed for applications requiring very short propagation delay times. This device is particularly suited for high-performance memory-decoding or data-routing applications. When used with high-speed memories and fast enable circuits, the delay times of these decoders and the enable time of the memory are typically less than the memory's access time, making the system delay introduced by the decoders negligible.
Key Specifications
| Parameter | Value |
|---|---|
| Circuit Type | 3-line to 8-line Decoder/Demultiplexer |
| Package Type | 16-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C to 85°C |
| Supply Voltage | 4.5V to 5.5V |
| High-Level Input Voltage | 2 V (VCC = 4.5 V to 5.5 V) |
| Low-Level Input Voltage | 0.8 V (VCC = 4.5 V to 5.5 V) |
| Input Transition Rise/Fall Time | 500 ns |
| Output Drive | ±4 mA at 5 V |
Key Features
- Designed for high-performance memory-decoding or data-routing applications requiring very short propagation delay times.
- Three enable inputs (two active-low and one active-high) to simplify cascading or data reception.
- Outputs can drive up to 10 LSTTL loads.
- Low power consumption, with a maximum ICC of 80 µA.
- Typical propagation delay time of 15 ns.
- Active low outputs (selected output is low).
Applications
- Communication systems
- Telephone networks
- Computer memory systems
- Transmission systems in satellite computer systems
- Time division multiplexing systems
- Frequency multiplexing systems
- A/D and D/A converters
- Implementing boolean functions with multiple variables
- Data collection systems
Q & A
- What is the primary function of the SN74HCT138DRG4?
The SN74HCT138DRG4 is a 3-line to 8-line decoder/demultiplexer designed for high-performance memory-decoding or data-routing applications.
- What is the operating voltage range of the SN74HCT138DRG4?
The operating voltage range is 4.5V to 5.5V.
- What is the package type of the SN74HCT138DRG4?
The package type is 16-SOIC (0.154", 3.90mm Width).
- What are the typical propagation delay times for this device?
The typical propagation delay time is 15 ns.
- How many enable inputs does the SN74HCT138DRG4 have?
The device has three enable inputs: two active-low and one active-high.
- What is the maximum output drive current at 5V?
The maximum output drive current at 5V is ±4 mA.
- What are some common applications of the SN74HCT138DRG4?
Common applications include communication systems, telephone networks, computer memory systems, and data collection systems.
- What is the operating temperature range of the SN74HCT138DRG4?
The operating temperature range is -40°C to 85°C.
- Can the SN74HCT138DRG4 be used in high-speed memory systems?
- Is the SN74HCT138DRG4 RoHS compliant?
