Overview
The Texas Instruments SN74HCT138DRE4 is a high-performance 3-to-8 decoder/demultiplexer designed for applications requiring very short propagation delay times. This device is particularly suited for high-speed memory-decoding or data-routing systems. When used with fast enable circuits in high-speed memory systems, the SN74HCT138DRE4 minimizes the effects of system decoding, ensuring that the effective system delay introduced by the decoder is negligible.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Part Number | SN74HCT138DRE4 | |
| Type | Decoder/Demultiplexer | |
| Circuit | 1 x 3:8 | |
| Independent Circuits | 1 | |
| Current - Output High, Low | 4mA, 4mA | |
| Voltage Supply Source | Single Supply | |
| Voltage - Supply | 4.5 V ~ 5.5 V | V |
| Operating Temperature | -40°C ~ 85°C | °C |
| Mounting Type | Surface Mount | |
| Package / Case | 16-SOIC (0.154", 3.90mm Width) | |
| Input Transition Rise/Fall Time | 500 ns | ns |
Key Features
- Designed for high-performance memory-decoding or data-routing applications requiring very short propagation delay times.
- Supplied in the 16-SOIC package with a surface mount type.
- Operates with a single supply voltage of 4.5 V to 5.5 V.
- Three binary inputs (A, B, C) select one of eight output lines, with two active-low and one active-high enable inputs.
- Enable inputs can be used to simplify cascading or data reception, and one enable input can be used as a data input for demultiplexing applications.
- Low power consumption with a maximum ICC of 80 µA and low input current of 1 µA maximum.
- Outputs can drive up to 10 LSTTL loads, with ±4-mA output drive at 5 V.
Applications
- Implementing boolean functions with multiple variables
- Data collection systems
- Audio, video, and image transmission
- Recording transmission
- Combinational circuits and logic gates for other digital devices
- Signal routing and data communication
- LED displays, servers, white goods, power infrastructure, building automation, and factory automation.
Q & A
- What is the primary function of the SN74HCT138DRE4?
The SN74HCT138DRE4 is a 3-to-8 decoder/demultiplexer designed for high-performance memory-decoding or data-routing applications.
- What is the operating voltage range of the SN74HCT138DRE4?
The operating voltage range is 4.5 V to 5.5 V.
- What is the package type of the SN74HCT138DRE4?
The device is supplied in a 16-SOIC package with a surface mount type.
- How many enable inputs does the SN74HCT138DRE4 have?
The device has three enable inputs: two active-low and one active-high.
- What is the maximum output current of the SN74HCT138DRE4?
The device can drive up to ±4-mA output at 5 V.
- What are some common applications of the SN74HCT138DRE4?
Common applications include data collection systems, audio, video, and image transmission, and combinational circuits.
- Can the SN74HCT138DRE4 be used in high-speed memory systems?
Yes, it is designed to minimize the effects of system decoding in high-speed memory systems.
- What is the operating temperature range of the SN74HCT138DRE4?
The operating temperature range is -40°C to 85°C.
- How many output lines can the SN74HCT138DRE4 select?
The device can select one of eight output lines based on the conditions at the binary-select inputs and the three enable inputs.
- Can the enable inputs be used for demultiplexing applications?
Yes, an enable input can be used as a data input for demultiplexing applications.
