Overview
The MC74HC138ADT is a high-performance CMOS 3-to-8 line decoder/demultiplexer manufactured by onsemi. This device is part of the Logic IC Chips category and is widely used in various digital systems. It decodes a three-bit binary weighted address to produce one active low output out of eight possible outputs. The device features multiple enable inputs (E1, E2, and E3) that allow for flexible configuration and cascading to create higher-order decoders. The MC74HC138ADT is designed for high-speed operation, low power consumption, and high noise immunity, making it suitable for a wide range of applications including address decoding, demultiplexing, and peripheral device control.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| VCC Supply Voltage | 2.0 | 6.0 | V |
| VIN Input Voltage | 0 | VCC | V |
| VO Output Voltage (Active Mode) | 0 | VCC | V |
| TA Operating Free-Air Temperature | -40 | 125 | °C |
| tr, tf Input Rise or Fall Time (VCC = 2.0V) | - | 1000 | ns |
| tr, tf Input Rise or Fall Time (VCC = 4.5V) | - | 500 | ns |
| tr, tf Input Rise or Fall Time (VCC = 6.0V) | - | 400 | ns |
| ICC Maximum Quiescent Supply Current | - | 40 | μA |
| Output Drive Capability | - | 10 LSTTL Loads | - |
Key Features
- Wide Supply Voltage Range from 2.0V to 6.0V
- CMOS low power consumption
- Schmitt Trigger Action at All Inputs
- Inputs Accept up to 6.0V
- ESD Protection: Exceeds 200-V Machine Model, 2000-V Human Body Model, and 1000-V Charged Device Model
- Latch-Up Exceeds 100mA per JESD 78D, Class II
- Totally Lead-Free & Fully RoHS Compliant
- Halogen and Antimony Free. “Green” Device
- High Noise Immunity and Low Power Dissipation
- Open-Drain Outputs for Flexible Interface Options
- Compact Surface Mount Package (TSSOP-16) for Space-Constrained Designs
- Directly Compatible with Widely Used 74HC Series Logic Devices
Applications
- Memory Chip Select Decoding
- Demultiplexing
- Single Line Peripheral Control
- Data Routing and Selection in Digital Systems
- Peripheral Device Control and Selection
- General-Purpose Logic Switching and Multiplexing
- Integration with Microcontrollers, Processors, and Other Digital Systems
Q & A
- What is the primary function of the MC74HC138ADT?
The MC74HC138ADT is a 3-to-8 line decoder/demultiplexer, which decodes a three-bit binary weighted address to produce one active low output out of eight possible outputs.
- What is the operating voltage range of the MC74HC138ADT?
The operating voltage range is from 2.0V to 6.0V.
- What type of inputs does the MC74HC138ADT have?
The device features Schmitt Trigger inputs and can accept voltages up to 6.0V.
- What is the package type of the MC74HC138ADT?
The device is available in a TSSOP-16 package.
- Is the MC74HC138ADT RoHS compliant?
- What are the key applications of the MC74HC138ADT?
The device is used in memory chip select decoding, demultiplexing, single line peripheral control, data routing, and peripheral device control.
- Does the MC74HC138ADT have ESD protection?
- What is the maximum quiescent supply current of the MC74HC138ADT?
The maximum quiescent supply current is 40 μA.
- Is the MC74HC138ADT compatible with other logic families?
- What is the operating temperature range of the MC74HC138ADT?
