Overview
The MC74ACT257DG is a quad 2-input multiplexer with 3-state outputs, produced by Motorola and now part of ON Semiconductor. This integrated circuit allows for the selection of four bits of data from two different sources using a common data select input. The outputs can be switched to a high impedance state, enabling direct interface with bus-oriented systems. This device is particularly useful in digital systems where data from multiple sources needs to be multiplexed and controlled.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| DC Supply Voltage (VCC) | 4.5 to 5.5 | V |
| DC Input Voltage (VI) | −0.5 to VCC + 0.5 | V |
| DC Output Voltage (VO) | −0.5 to VCC + 0.5 | V |
| DC Output Sink/Source Current (IO) | ±50 | mA |
| Operating Ambient Temperature Range (TA) | −40 to +85 | °C |
| Input Rise and Fall Time (tr, tf) | 8.0 to 10 ns/V (at VCC = 5.5 V) | ns/V |
| Propagation Delay (tPLH, tPHL) | 5.0 to 7.5 ns (at VCC = 5.0 V, CL = 50 pF) | ns |
| Output Enable Time (tPZH, tPZL) | 6.0 to 9.0 ns (at VCC = 5.0 V, CL = 50 pF) | ns |
| Package Type | 16-SOIC |
Key Features
- Quad 2-input multiplexer with 3-state outputs
- Noninverting outputs
- Outputs can be switched to high impedance state using the Output Enable (OE) input
- Multiplexer expansion possible by tying outputs together
- TTL compatible inputs for the MC74ACT257
- Pb-free devices
- Outputs source/sink up to 24 mA
Applications
- Bus-oriented systems where multiple data sources need to be multiplexed
- Digital communication systems requiring data selection and control
- Embedded systems and microcontrollers needing to manage multiple data inputs
- Industrial control systems and automation where data from various sensors or sources need to be processed
Q & A
- What is the primary function of the MC74ACT257DG?
The primary function is to act as a quad 2-input multiplexer with 3-state outputs, allowing the selection of four bits of data from two different sources.
- What is the voltage supply range for the MC74ACT257DG?
The voltage supply range is from 4.5V to 5.5V.
- What is the maximum output current for the MC74ACT257DG?
The maximum output current is ±50 mA.
- How can the outputs be switched to a high impedance state?
The outputs can be switched to a high impedance state by placing a logic HIGH on the common Output Enable (OE) input.
- What is the operating temperature range for the MC74ACT257DG?
The operating ambient temperature range is from −40°C to +85°C.
- Is the MC74ACT257DG Pb-free?
Yes, the MC74ACT257DG is a Pb-free device.
- What is the package type for the MC74ACT257DG?
The package type is 16-SOIC.
- Can the outputs of the MC74ACT257DG be tied together for multiplexer expansion?
Yes, the outputs can be tied together for multiplexer expansion.
- Are the inputs of the MC74ACT257DG TTL compatible?
Yes, the inputs of the MC74ACT257DG are TTL compatible.
- What is the typical propagation delay for the MC74ACT257DG?
The typical propagation delay is around 5.0 to 7.5 ns at VCC = 5.0 V and CL = 50 pF.
