Overview
The SN74LVC138A, produced by Texas Instruments, is a high-performance 3-line to 8-line decoder/demultiplexer designed for applications requiring very short propagation delay times. These devices are particularly suited for high-performance memory-decoding or data-routing applications, where they minimize the effects of system decoding and ensure that the effective system delay introduced by the decoders is negligible when used with high-speed memories and fast enable circuits.
Key Specifications
| Specification | Value |
|---|---|
| Package | TSSOP (PW) - 16 pins |
| Operating Temperature Range | -40°C to 85°C |
| Supply Voltage Range | 1.65 V to 3.6 V |
| Input Voltage Range | Up to 5.5 V |
| Propagation Delay Time (max) at 3.3 V | 5.8 ns |
| Output Ground Bounce (typical) at VCC= 3.3 V, TA= 25°C | < 0.8 V |
| Output Undershoot (typical) at VCC= 3.3 V, TA= 25°C | > 2 V |
| Latch-Up Performance | Exceeds 250 mA per JESD 17 |
Key Features
- Operate from 1.65 V to 3.6 V
- Inputs accept voltages up to 5.5 V
- Maximum propagation delay time of 5.8 ns at 3.3 V
- Typical output ground bounce less than 0.8 V and output undershoot greater than 2 V at VCC= 3.3 V, TA= 25°C
- Latch-up performance exceeds 250 mA per JESD 17
Applications
The SN74LVC138A is ideal for high-performance memory-decoding or data-routing applications. It is particularly useful in systems where very short propagation delay times are critical, such as in high-speed memory systems. These decoders can be employed with fast enable circuits to ensure that the overall system delay remains minimal.
Q & A
- What is the primary function of the SN74LVC138A?
The SN74LVC138A is a 3-line to 8-line decoder/demultiplexer designed for high-performance memory-decoding or data-routing applications. - What is the operating temperature range of the SN74LVC138A?
The operating temperature range is -40°C to 85°C. - What is the supply voltage range for the SN74LVC138A?
The supply voltage range is from 1.65 V to 3.6 V. - How much input voltage can the SN74LVC138A handle?
The inputs can accept voltages up to 5.5 V. - What is the maximum propagation delay time at 3.3 V for the SN74LVC138A?
The maximum propagation delay time at 3.3 V is 5.8 ns. - What is the typical output ground bounce and undershoot at VCC= 3.3 V, TA= 25°C?
The typical output ground bounce is less than 0.8 V, and the typical output undershoot is greater than 2 V. - What is the latch-up performance of the SN74LVC138A according to JESD 17?
The latch-up performance exceeds 250 mA per JESD 17. - In what types of applications is the SN74LVC138A typically used?
The SN74LVC138A is typically used in high-performance memory-decoding or data-routing applications. - How does the SN74LVC138A minimize system delay in high-speed memory systems?
The SN74LVC138A minimizes system delay by ensuring that the delay times of the decoders and the enable time of the memory are usually less than the typical access time of the memory. - What package type and pin count does the SN74LVC138A come in?
The SN74LVC138A comes in a TSSOP (PW) package with 16 pins.
