Overview
The MC74HC138ADTR2 is a high-performance silicon-gate CMOS 1-of-8 decoder/demultiplexer produced by onsemi. This device is part of the MC74HC138A series and is packaged in a TSSOP-16 format. It decodes a three-bit binary weighted address to one of eight active-low outputs. The device features three chip select inputs, two active-low (E1 and E2) and one active-high (E3), which facilitate demultiplexing, cascading, and chip-selecting functions.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| VCC (Supply Voltage) | 2.0 | 6.0 | V |
| VIN, VOUT (DC Input, Output Voltage) | 0 | VCC | V |
| TA (Operating Free-Air Temperature) | -55 | 125 | °C |
| tr, tf (Input Rise or Fall Time) | 0 | 1000 (VCC=2.0V), 500 (VCC=4.5V), 400 (VCC=6.0V) | ns |
| VIH (Minimum High-Level Input Voltage) | 1.5 (VCC=2.0V), 2.1 (VCC=4.5V), 3.15 (VCC=6.0V) | V | |
| VIL (Maximum Low-Level Input Voltage) | 0.5 (VCC=2.0V), 0.9 (VCC=4.5V), 1.35 (VCC=6.0V) | V | |
| ICC (Maximum Quiescent Supply Current) | 40 (VCC=6.0V) | μA | |
| tPLH, tPHL (Maximum Propagation Delay) | 135 (VCC=2.0V), 90 (VCC=4.5V), 27 (VCC=6.0V) | ns |
Key Features
- Output Drive Capability: 10 LSTTL Loads
- Outputs Directly Interface to CMOS, NMOS, and TTL
- Wide Supply Voltage Range from 2.0V to 6.0V
- Low Input Current: 1.0 μA
- High Noise Immunity Characteristic of CMOS Devices
- Schmitt Trigger Action at All Inputs
- ESD Protection Tested per JESD 22 (Exceeds 200-V Machine Model, 2000-V Human Body Model, 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)
Applications
- Memory Chip Select Decoding
- Demultiplexing
- Single Line Peripheral Control
- Cascading and Chip-Selecting Functions
Q & A
- What is the MC74HC138ADTR2 used for?
The MC74HC138ADTR2 is used as a 1-of-8 decoder/demultiplexer, decoding a three-bit binary weighted address to one of eight active-low outputs.
- What is the supply voltage range for the MC74HC138ADTR2?
The supply voltage range is from 2.0V to 6.0V.
- How many chip select inputs does the MC74HC138ADTR2 have?
The device has three chip select inputs: two active-low (E1 and E2) and one active-high (E3).
- What is the maximum propagation delay for the MC74HC138ADTR2?
The maximum propagation delay varies by supply voltage, ranging from 135ns at VCC=2.0V to 27ns at VCC=6.0V.
- Is the MC74HC138ADTR2 ESD protected?
- What type of packaging does the MC74HC138ADTR2 come in?
The device is packaged in a TSSOP-16 format.
- Can the MC74HC138ADTR2 be used with TTL outputs?
- What is the maximum input current for the MC74HC138ADTR2?
The maximum input current is 1.0 μA.
- Is the MC74HC138ADTR2 RoHS compliant?
- What are some common applications of the MC74HC138ADTR2?
