Overview
The MC74HC138ADR2G is a high-performance silicon-gate CMOS 1-of-8 decoder/demultiplexer produced by onsemi. This device is part of the 74HC series and is known for its compatibility with a wide range of logic families. It decodes a three-bit address to one of eight active-low outputs, making it highly versatile in digital circuit design. The MC74HC138ADR2G is identical in pinout to the LS138 and features three chip select inputs to facilitate demultiplexing, cascading, and chip-selecting functions.
Key Specifications
| Attribute | Value |
|---|---|
| Logic Circuit | Decoder/Demultiplexer |
| Family | A/HC/T/U |
| Number of Functions / Channels | 2 |
| Supply Voltage (Nominal) | 2V to 6V |
| Number of Inputs | 3 |
| Package Style | SOIC-16 |
| Mounting Method | Surface Mount |
| Pin Count | 16 |
| Dimensions | 10 x 4 x 1.5mm |
| Maximum Operating Temperature | +125 °C |
| Minimum Operating Temperature | -55 °C |
| Output Drive Capability | 10 LSTTL Loads |
| Low Input Current | 1.0 µA |
Key Features
- Output Drive Capability: 10 LSTTL Loads
- Outputs Directly Interface to CMOS, NMOS, and TTL
- Operating Voltage Range: 2.0 to 6.0 V
- Low Input Current: 1.0 µA
- High Noise Immunity Characteristic of CMOS Devices
- In Compliance with the Requirements Defined by JEDEC Standard No. 7A
- Chip Complexity: 122 FETs or 30.5 Equivalent Gates
- Pb−Free Packages are Available
Applications
The MC74HC138ADR2G is widely used in various digital circuit applications, including:
- Demultiplexing and decoding in digital systems
- Cascading and chip-selecting functions
- Level conversion for interfacing TTL or NMOS outputs to High Speed CMOS inputs
- General-purpose logic circuits requiring high-speed CMOS logic
Q & A
- What is the primary function of the MC74HC138ADR2G?
The MC74HC138ADR2G is a 1-of-8 decoder/demultiplexer, decoding a three-bit address to one of eight active-low outputs.
- What is the operating voltage range of the MC74HC138ADR2G?
The operating voltage range is 2.0 to 6.0 V.
- How many chip select inputs does the MC74HC138ADR2G have?
The device has three chip select inputs, two active-low and one active-high.
- What is the package style of the MC74HC138ADR2G?
The package style is SOIC-16.
- Is the MC74HC138ADR2G compatible with other logic families?
Yes, it is compatible with CMOS, NMOS, and TTL logic families.
- What is the maximum operating temperature of the MC74HC138ADR2G?
The maximum operating temperature is +125 °C.
- What is the low input current characteristic of the MC74HC138ADR2G?
The low input current is 1.0 µA.
- Is the MC74HC138ADR2G Pb-free?
Yes, Pb-free packages are available.
- How many FETs or equivalent gates does the MC74HC138ADR2G contain?
The chip complexity is 122 FETs or 30.5 equivalent gates.
- What are some common applications of the MC74HC138ADR2G?
Common applications include demultiplexing, decoding, cascading, and level conversion in digital systems.
