Overview
The MC74ACT157DG is a high-speed quad 2-input multiplexer produced by onsemi. This device is part of the 74ACT series, known for its TTL-compatible inputs and high-speed operation. The MC74ACT157DG allows for the selection of four bits of data from two sources using a common Select and Enable input. It is particularly useful in applications requiring data routing and function generation.
Key Specifications
| Parameter | Value | Unit | Conditions |
|---|---|---|---|
| VCC (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 | VCC = 4.5 V, VOH = 2.1 V |
| IOL (Output Current - Low) | -24 | mA | VCC = 4.5 V, VOL = 0.1 V |
| tPLH (Propagation Delay S to Zn) | 2.0 to 9.0 | ns | VCC = 5.0 V, CL = 50 pF |
| tPHL (Propagation Delay S to Zn) | 2.0 to 9.5 | ns | VCC = 5.0 V, CL = 50 pF |
| CIN (Input Capacitance) | 4.5 | pF | VCC = 5.0 V |
| CPD (Power Dissipation Capacitance) | 50 | pF | VCC = 5.0 V |
Key Features
- High-speed quad 2-input multiplexer
- TTL-compatible inputs (for MC74ACT157)
- Outputs source/sink 24 mA
- Pb-free devices
- Can be used as a function generator to implement gating functions
- Active-LOW Enable input (E) forces all outputs LOW when HIGH
- Common Select input (S) determines the data source
Applications
- Data routing and selection in digital circuits
- Function generation for implementing various logical functions
- Gating functions in complex digital systems
- Moving data from two groups of registers to four common output buses
- General-purpose multiplexing in digital systems
Q & A
- What is the primary function of the MC74ACT157DG?
The primary function is to act as a high-speed quad 2-input multiplexer, selecting four bits of data from two sources based on the Select and Enable inputs.
- What is the voltage range for the VCC supply voltage?
The VCC supply voltage range is from 4.5 to 5.5 volts.
- What is the maximum output current for the MC74ACT157DG?
The maximum output current is 24 mA for both high and low output levels.
- How does the Enable input (E) affect the outputs?
The Enable input (E) is active-LOW, meaning that when E is HIGH, all outputs are forced LOW regardless of other inputs.
- What is the typical propagation delay for the Select input to output?
The typical propagation delay for the Select input to output is between 2.0 to 9.5 ns at VCC = 5.0 V and CL = 50 pF.
- Can the MC74ACT157DG be used as a function generator?
Yes, it can be used as a function generator to implement various logical functions of two variables.
- What is the operating temperature range for the MC74ACT157DG?
The operating temperature range is from -40°C to 85°C.
- Is the MC74ACT157DG Pb-free?
Yes, the MC74ACT157DG is a Pb-free device.
- What are the common package types available for the MC74ACT157DG?
The device is available in SOIC-16 and TSSOP-16 packages.
- What is the input capacitance of the MC74ACT157DG?
The input capacitance is typically 4.5 pF at VCC = 5.0 V.
