Overview
The SN74ACT245DWE4 is an octal bus transceiver with 3-state outputs, designed by Texas Instruments for asynchronous two-way communication between data buses. This device is part of the SN74ACT245 series and is packaged in a 20-pin SOIC (DW) package. It is optimized for use in various applications where reliable and efficient data transfer between buses is crucial.
The SN74ACT245DWE4 operates within a VCC range of 4.5V to 5.5V and is compatible with TTL voltage levels. The device features a direction-control input (DIR) and an output-enable input (OE), which allow for flexible control over data transmission and bus isolation.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| VCC Supply Voltage | 4.5 | 5.5 | V |
| VIH High-Level Input Voltage | 2 | 2 | V |
| VIL Low-Level Input Voltage | 0.8 | 0.8 | V |
| IOH High-Level Output Current | -24 | -24 | mA |
| IOL Low-Level Output Current | 24 | 24 | mA |
| TA Operating Free-Air Temperature | -40 | 85 | °C |
| tPLH Propagation Delay Time (A or B to B or A) | 1 | 9 | ns |
| tPHL Propagation Delay Time (A or B to B or A) | 1 | 10 | ns |
Key Features
- Operates within a VCC range of 4.5V to 5.5V, making it compatible with 5V systems.
- Inputs accept voltages up to 5.5V, ensuring compatibility with a wide range of input signals.
- Maximum propagation delay time of 8ns at 5V, ensuring fast data transfer.
- TTL-voltage compatible inputs for seamless integration with TTL logic circuits.
- 3-state outputs that can be disabled via the output-enable (OE) input, allowing for bus isolation.
- Direction-control input (DIR) for flexible control over data transmission direction.
- Low drive and slow edge rates to minimize output ringing and overshoot.
Applications
- Professional Audio Systems: For reliable data transfer in audio equipment.
- Video and Signage: Used in video processing and display systems.
- Appliances: Integrated into various consumer and industrial appliances for data communication.
- Factory Automation and Control: Utilized in industrial control systems for efficient data exchange.
Q & A
- What is the operating voltage range of the SN74ACT245DWE4?
The SN74ACT245DWE4 operates within a VCC range of 4.5V to 5.5V.
- What is the maximum propagation delay time of the SN74ACT245DWE4 at 5V?
The maximum propagation delay time is 8ns at 5V.
- How do the 3-state outputs work in the SN74ACT245DWE4?
The 3-state outputs can be disabled via the output-enable (OE) input, allowing for bus isolation.
- What is the purpose of the direction-control input (DIR) in the SN74ACT245DWE4?
The DIR input controls the direction of data transmission between the A and B buses.
- What are the typical applications of the SN74ACT245DWE4?
It is used in professional audio systems, video and signage, appliances, and factory automation and control.
- How does the SN74ACT245DWE4 minimize output ringing?
The device features low drive and slow edge rates to minimize output ringing and overshoot.
- What is the temperature range for the SN74ACT245DWE4?
The operating free-air temperature range is -40°C to 85°C.
- What is the package type of the SN74ACT245DWE4?
The device is packaged in a 20-pin SOIC (DW) package.
- Are the inputs of the SN74ACT245DWE4 TTL-voltage compatible?
Yes, the inputs are TTL-voltage compatible.
- How should the output-enable (OE) input be managed during power-up or power-down?
The OE input should be tied to VCC through a pullup resistor to ensure the high-impedance state.
