Overview
The 74AHC138D,118 is a 3-to-8 line decoder/demultiplexer produced by Nexperia. This high-speed Si-gate CMOS device is designed to be pin compatible with Low power Schottky TTL (LSTTL) and complies with JEDEC standard No. 7A. It is widely used in digital circuits for decoding and demultiplexing applications.
Key Specifications
| Type number | VCC (V) | Logic switching levels | Output drive capability (mA) | tpd (ns) | Power dissipation considerations | Tamb (°C) | Rth(j-a) (K/W) | Ψth(j-top) (K/W) | Rth(j-c) (K/W) | Package name |
|---|---|---|---|---|---|---|---|---|---|---|
| 74AHC138D | 2.0 - 5.5 | CMOS | ± 8 | 4.4 | Low | -40 ~ 125 | 93 | 9.7 | 52 | SO16 |
Key Features
- High-Speed Operation: The 74AHC138D,118 operates at high speeds, making it suitable for high-frequency applications.
- Multiple Enable Inputs: It features three enable inputs (two active LOW and one active HIGH), allowing for easy parallel expansion and demultiplexing capabilities.
- Schmitt-Trigger Action: All inputs have Schmitt-trigger action, which helps in noise immunity.
- ESD Protection: The device offers ESD protection with HBM exceeding 2000 V and CDM exceeding 1000 V.
- Wide Operating Temperature Range: It operates from -40 °C to +125 °C, making it versatile for various environmental conditions.
- Low Power Consumption: The device has low power dissipation, which is beneficial for power-sensitive applications.
Applications
- Memory Chip Select Decoding: Ideal for decoding memory chip select lines due to its multiple enable inputs and high-speed operation.
- Demultiplexing: Can be used as an eight output demultiplexer by utilizing one of the active LOW enable inputs as the data input.
- Parallel Expansion: Allows easy parallel expansion to a 1-of-32 decoder with just four devices and one inverter.
- General Digital Circuits: Suitable for various digital circuit applications requiring decoding and demultiplexing functions.
Q & A
- What is the primary function of the 74AHC138D,118?
The primary function of the 74AHC138D,118 is to act as a 3-to-8 line decoder/demultiplexer.
- How many enable inputs does the 74AHC138D,118 have?
The device has three enable inputs: two active LOW (E1 and E2) and one active HIGH (E3).
- What is the operating voltage range of the 74AHC138D,118?
The operating voltage range is from 2.0 V to 5.5 V.
- What type of logic switching levels does the 74AHC138D,118 operate with?
The device operates with CMOS logic switching levels.
- What is the maximum propagation delay of the 74AHC138D,118?
The maximum propagation delay is approximately 4.4 ns.
- Does the 74AHC138D,118 have ESD protection?
Yes, it offers ESD protection with HBM exceeding 2000 V and CDM exceeding 1000 V.
- What is the package type of the 74AHC138D,118?
The device comes in a SO16 (SOT109-1) package.
- Can the 74AHC138D,118 be used for demultiplexing?
Yes, it can be used as an eight output demultiplexer by using one of the active LOW enable inputs as the data input.
- What is the temperature range for the 74AHC138D,118?
The device operates from -40 °C to +125 °C.
- Is the 74AHC138D,118 RoHS compliant?
Yes, the device is RoHS compliant.
