Overview
The SN74ACT245PWR is an octal bus transceiver with 3-state outputs, designed and manufactured by Texas Instruments. This component is part of the SNx4ACT245 family and is optimized for asynchronous two-way communication between data buses. It operates within a VCC range of 4.5V to 5.5V, making it suitable for a variety of applications where reliable data transfer is crucial.
The device features a control-function implementation that minimizes external timing requirements, allowing for efficient data transfer between the A and B buses based on the logic level at the direction-control (DIR) input. The output-enable (OE) pin allows for the isolation of the buses when set high, ensuring that the buses are effectively isolated during power-up or power-down phases.
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 |
| RθJA Junction-to-Ambient Thermal Resistance (TSSOP) | 126.6 | °C/W |
Key Features
- VCC operation range of 4.5V to 5.5V, making it compatible with a wide range of systems.
- Inputs accept voltages up to 5.5V and are TTL-voltage compatible.
- Maximum propagation delay time (tpd) of 8ns at 5V, ensuring fast data transfer.
- Low drive and slow edge rates to minimize output ringing, overshoot, and undershoot.
- Output-enable (OE) and direction-control (DIR) inputs for flexible data direction and bus isolation.
- Available in various packages including TSSOP (PW), SOIC (DW), SSOP (DB), and others, offering flexibility in design and implementation.
Applications
- Professional Audio Systems: For reliable data transfer in audio equipment.
- Video and Signage: Used in video processing and display systems where data integrity is critical.
- Appliances: Integrated into various consumer and industrial appliances for robust data communication.
- Factory Automation and Control: Utilized in industrial automation systems for reliable data transfer between control units and peripherals.
- Digital Signal Processing: To enable or disable digital signals, hold signals during controller resets, and debounce switches.
Q & A
- What is the operating voltage range of the SN74ACT245PWR?
The SN74ACT245PWR operates within a VCC range of 4.5V to 5.5V.
- What is the maximum propagation delay time of the SN74ACT245PWR at 5V?
The maximum propagation delay time (tpd) at 5V is 8ns.
- How do the OE and DIR inputs function in the SN74ACT245PWR?
The OE (output-enable) input isolates the buses when set high, and the DIR (direction-control) input determines the direction of data transfer between the A and B buses.
- What are the thermal characteristics of the TSSOP package for the SN74ACT245PWR?
The junction-to-ambient thermal resistance (RθJA) for the TSSOP package is 126.6°C/W.
- Is the SN74ACT245PWR compatible with TTL voltage levels?
- What are some common applications of the SN74ACT245PWR?
The SN74ACT245PWR is used in professional audio systems, video and signage, appliances, and factory automation and control systems.
- How does the SN74ACT245PWR minimize output ringing?
The device has low drive and slow edge rates to minimize output ringing, overshoot, and undershoot.
- What packages are available for the SN74ACT245PWR?
The SN74ACT245PWR is available in various packages including TSSOP (PW), SOIC (DW), SSOP (DB), and others.
- What is the operating temperature range for the SN74ACT245PWR?
The operating free-air temperature range is -40°C to 85°C.
- How should the OE pin be handled during power-up or power-down phases?
The OE pin should be tied to VCC through a pullup resistor to ensure the high-impedance state during power-up or power-down phases.
