Overview
The MC74ACT138DR2G is a high-speed 1-of-8 decoder/demultiplexer produced by onsemi. This device is designed for high-speed applications, particularly in bipolar memory chip select address decoding. It features three binary weighted input lines (A0, A1, A2) and provides eight mutually exclusive active-LOW output lines (O0-O7). The device is available in a SOIC-16 package and is Pb-free, making it suitable for a wide range of electronic systems.
Key Specifications
| Parameter | Value | Unit | Conditions |
|---|---|---|---|
| VCC (DC Supply Voltage) | 4.5 to 5.5 | V | |
| VI (DC Input Voltage) | 0 to VCC | V | |
| VO (DC Output Voltage) | 0 to VCC | V | |
| TA (Operating Ambient Temperature Range) | -40 to 85 | °C | |
| IOH (Output Current - High) | -24 | mA | |
| IOL (Output Current - Low) | 24 | mA | |
| tPLH (Propagation Delay An to On) | 7.0 to 10.5 | ns | VCC = 5.0 V, CL = 50 pF |
| tPHL (Propagation Delay An to On) | 6.5 to 10.5 | ns | VCC = 5.0 V, CL = 50 pF |
| ICC (Maximum Quiescent Supply Current) | 80 | μA | VIN = VCC or GND |
Key Features
- High-speed 1-of-8 decoder/demultiplexer
- Three binary weighted input lines (A0, A1, A2) and eight mutually exclusive active-LOW output lines (O0-O7)
- Multiple input enables for easy parallel expansion (two active-LOW and one active-HIGH enable inputs)
- Outputs source/sink 24 mA
- TTL compatible inputs for the MC74ACT138 version
- Pb-free package
- Capable of demultiplexing by using one of the active LOW Enable inputs as the data input and the other Enable inputs as strobes
Applications
- High-speed bipolar memory chip select address decoding
- Demultiplexing applications
- Parallel expansion to higher decoder configurations (e.g., 1-of-24 or 1-of-32 decoders)
- General digital logic circuits requiring high-speed decoding and demultiplexing
Q & A
- What is the primary function of the MC74ACT138DR2G?
The MC74ACT138DR2G is a high-speed 1-of-8 decoder/demultiplexer, designed to decode three binary weighted input lines into eight mutually exclusive active-LOW output lines.
- What are the key enable inputs of the MC74ACT138DR2G?
The device has three enable inputs: two active-LOW (E1, E2) and one active-HIGH (E3).
- How can the MC74ACT138DR2G be expanded for higher decoder configurations?
The device can be expanded to a 1-of-24 decoder using three MC74ACT138DR2G devices or to a 1-of-32 decoder using four devices and one inverter.
- What is the output current capability of the MC74ACT138DR2G?
The outputs can source/sink up to 24 mA.
- Is the MC74ACT138DR2G Pb-free?
- What are the typical propagation delays for the MC74ACT138DR2G?
The propagation delays range from 6.5 to 10.5 ns for the address inputs to output transitions at VCC = 5.0 V and CL = 50 pF.
- What is the operating temperature range for the MC74ACT138DR2G?
The device operates within an ambient temperature range of -40°C to 85°C.
- Can the MC74ACT138DR2G be used as a demultiplexer?
- What is the maximum quiescent supply current for the MC74ACT138DR2G?
The maximum quiescent supply current is 80 μA when VIN = VCC or GND.
- What package types are available for the MC74ACT138DR2G?
The device is available in a SOIC-16 package.
