Overview
The SN74LVC138A, specifically the SN74LVC138APWE4, is a high-performance 3-line to 8-line decoder/demultiplexer designed by Texas Instruments. This device is optimized for memory-decoding or data-routing applications that require very short propagation delay times. It is particularly useful in high-performance memory systems where it minimizes the effects of system decoding, ensuring that the effective system delay introduced by the decoder is negligible when used with fast enable circuits and high-speed memories.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | TSSOP (PW) | - |
| Pins | 16 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage Range | 2 to 3.6 | V |
| Input Voltage Range | 0 to 5.5 | V |
| Maximum Propagation Delay (tpd) at 3.3 V | 5.8 ns | ns |
| Typical Output Ground Bounce (VOLP) at VCC = 3.3 V, TA = 25°C | < 0.8 V | V |
| Typical Output VOH Undershoot (VOHV) at VCC = 3.3 V, TA = 25°C | > 2 V | V |
| Latch-Up Performance | > 250 mA per JESD 17 | mA |
| ESD Protection | > 2000 V per MIL-STD-883, Method 3015 | V |
Key Features
- Operates from 2 V to 3.6 V, making it versatile for various voltage systems.
- Inputs accept voltages up to 5.5 V, allowing compatibility with 3.3-V and 5-V devices.
- Maximum propagation delay of 5.8 ns at 3.3 V, ensuring high-speed operation.
- Typical output ground bounce (VOLP) less than 0.8 V and output VOH undershoot greater than 2 V at VCC = 3.3 V and TA = 25°C.
- Latch-up performance exceeds 250 mA per JESD 17.
- ESD protection exceeds 2000 V per MIL-STD-883, Method 3015.
- Two active-low enable inputs and one active-high enable input reduce the need for external gates or inverters.
- Supports defense, aerospace, and medical applications with controlled baseline, one assembly/test site, and one fabrication site.
Applications
The SN74LVC138A is designed for high-performance memory-decoding or data-routing applications. It is particularly useful in:
- High-speed memory systems where it minimizes the effects of system decoding.
- Data-routing applications requiring very short propagation delay times.
- Mixed 3.3-V/5-V system environments as a translator.
- Defense, aerospace, and medical applications due to its robust specifications and controlled baseline.
Q & A
- What is the operating voltage range of the SN74LVC138A?
The SN74LVC138A operates from 2 V to 3.6 V.
- What is the maximum propagation delay of the SN74LVC138A at 3.3 V?
The maximum propagation delay is 5.8 ns at 3.3 V.
- Can the inputs of the SN74LVC138A accept voltages higher than the supply voltage?
- What is the typical output ground bounce (VOLP) at VCC = 3.3 V and TA = 25°C?
- Does the SN74LVC138A have ESD protection?
- What are the enable input configurations of the SN74LVC138A?
- Can the SN74LVC138A be used in mixed voltage systems?
- What are the typical applications of the SN74LVC138A?
- What is the operating temperature range of the SN74LVC138APWE4?
- Does the SN74LVC138A support latch-up protection?
