Overview
The 74AHC138D,112 is a 3-to-8 line decoder/demultiplexer integrated circuit produced by NXP Semiconductors. This device is part of the 74AHC series, known for its advanced high-speed CMOS technology. It is designed to accept a three-bit binary weighted address on its input pins and produce one active low output, with the remaining seven outputs being high. The device features multiple enable inputs, allowing for flexible control and expansion capabilities.
Key Specifications
| Parameter | Description | Value | Unit |
|---|---|---|---|
| Supply Voltage Range | VCC | 2.0 V to 5.5 V | V |
| Input Voltage Range | VI | -0.5 V to 7.0 V | V |
| Output Current | IO | ± 25 mA | mA |
| High-level Input Voltage | VIH | 2.0 V (min), 3.85 V (max) at VCC = 5 V | V |
| Low-level Input Voltage | VIL | 0.5 V (max) at VCC = 2.0 V | V |
| Propagation Delay Time | tPD | 6 ns (typ) at VCC = 5 V | ns |
| Power Dissipation Capacitance | Cpd | 18 pF (typ) at f = 1 MHz | pF |
| Package Type | SO-16, TSSOP-16, SOIC-16 |
Key Features
- Wide Supply Voltage Range: Operates from 2.0 V to 5.5 V, making it versatile for various applications.
- Low Power Consumption: CMOS technology ensures low power consumption.
- Schmitt Trigger Action: All inputs have Schmitt trigger action, which helps in noise immunity.
- Multiple Enable Inputs: Two active LOW enable inputs (E1 and E2) and one active HIGH enable input (E3) allow for flexible control and expansion.
- Parallel Expansion Capability: Can be expanded to create 4-to-16 line and 5-to-32 line decoders with minimal additional components.
- High Output Drive Capability: Sinks or sources up to 8 mA at VCC = 4.5 V.
Applications
- Digital Systems: Ideal for use in digital systems requiring decoding and demultiplexing functions.
- Memory Decoding: Used in memory decoding circuits to select specific memory locations.
- Data Transmission: Employed in data transmission systems to demultiplex data streams.
- Control Systems: Utilized in control systems for decoding control signals and activating specific outputs.
Q & A
- What is the primary function of the 74AHC138D,112 IC?
The primary function is to act as a 3-to-8 line decoder/demultiplexer.
- What is the supply voltage range for this IC?
The supply voltage range is from 2.0 V to 5.5 V.
- How many enable inputs does the 74AHC138D,112 have?
It has two active LOW enable inputs (E1 and E2) and one active HIGH enable input (E3).
- What is the typical propagation delay time for this IC?
The typical propagation delay time is 6 ns at VCC = 5 V.
- Can the 74AHC138D,112 be expanded to create higher-order decoders?
Yes, it can be expanded to create 4-to-16 line and 5-to-32 line decoders with minimal additional components.
- What type of package is the 74AHC138D,112 available in?
It is available in SO-16, TSSOP-16, and SOIC-16 packages.
- What is the maximum output current this IC can handle?
The maximum output current is ± 25 mA.
- Does the 74AHC138D,112 have Schmitt trigger inputs?
Yes, all inputs have Schmitt trigger action for improved noise immunity.
- What are some common applications of the 74AHC138D,112?
Common applications include digital systems, memory decoding, data transmission, and control systems.
- What is the power dissipation capacitance of the 74AHC138D,112?
The power dissipation capacitance is typically 18 pF at f = 1 MHz.
