Overview
The SN74HC138DR, produced by Texas Instruments, is a 3-line to 8-line decoder/demultiplexer designed for high-performance memory-decoding and data-routing applications. This device is optimized for use in systems requiring very short propagation delay times, making it ideal for high-speed memory systems and data transmission. The SN74HC138DR can minimize the effects of system decoding and is particularly useful when used with high-speed memories and fast enable circuits, ensuring that the system delay introduced by the decoder is negligible.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2 | 5 | 6 | V |
| Propagation Delay (tpd) at VCC = 2 V | 225 | - | - | ns |
| Propagation Delay (tpd) at VCC = 4.5 V | 45 | - | - | ns |
| Propagation Delay (tpd) at VCC = 6 V | 38 | - | - | ns |
| Output Drive at 5 V | - | ±4 | - | mA |
| Input Current | - | 1 | - | µA |
| Operating Temperature | -40 | - | 85 | °C |
| Package Type | - | SOIC (16 pins) | - | - |
| Body Size | - | 9.90 mm x 3.90 mm | - | - |
Key Features
- Targeted specifically for high-speed memory decoders and data-transmission systems.
- Wide operating voltage range of 2 V to 6 V.
- Outputs can drive up to 10 LSTTL loads.
- Low power consumption, with a maximum ICC of 80 µA.
- Typical propagation delay of 15 ns.
- ±4-mA output drive at 5 V.
- Low input current of 1 µA maximum.
- Active low outputs (selected output is low).
- Incorporate three enable inputs to simplify cascading or data reception.
Applications
- LED displays.
- Servers.
- White goods.
- Power infrastructure.
- Building automation.
- Factory automation.
Q & A
- What is the primary function of the SN74HC138DR?
The SN74HC138DR 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 SN74HC138DR?
The operating voltage range is from 2 V to 6 V. - How many LSTTL loads can the outputs of the SN74HC138DR drive?
The outputs can drive up to 10 LSTTL loads. - What is the typical propagation delay of the SN74HC138DR?
The typical propagation delay is 15 ns. - What is the maximum power consumption of the SN74HC138DR?
The maximum power consumption is 80 µA. - What type of outputs does the SN74HC138DR have?
The SN74HC138DR has active low outputs. - How many enable inputs does the SN74HC138DR have?
The device has three enable inputs. - What is the operating temperature range of the SN74HC138DR?
The operating temperature range is from -40°C to 85°C. - What package types are available for the SN74HC138DR?
The device is available in several package types, including SOIC, SSOP, PDIP, and TSSOP. - What are some common applications of the SN74HC138DR?
Common applications include LED displays, servers, white goods, power infrastructure, building automation, and factory automation.
