Overview
The SN74AC245PWR is an octal bus transceiver produced by Texas Instruments, designed for asynchronous two-way communication between data buses. This device is part of the 74AC series, known for its high-speed and low-power CMOS logic. It operates over a wide VCC range from 2 V to 6 V, making it versatile for various applications. The SN74AC245PWR features 3-state outputs, which can be enabled or disabled using the output-enable (OE) input, and the direction-control (DIR) input determines the direction of data transmission between the A and B buses.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | - | 6 | V |
| Input Voltage | -0.5 | - | VCC + 0.5 | V |
| Output Voltage | -0.5 | - | VCC + 0.5 | V |
| High-Level Output Current (IOH) | -12 | -24 | -24 | mA (at VCC = 3 V, 4.5 V, 5.5 V respectively) |
| Low-Level Output Current (IOL) | 12 | 24 | 24 | mA (at VCC = 3 V, 4.5 V, 5.5 V respectively) |
| Propagation Delay Time (tPLH/tPHL) | 1.5 | 3.5 | 6.5 | ns (at VCC = 5 V) |
| Operating Temperature Range | -40 | - | 85 | °C |
| Storage Temperature Range | -65 | - | 150 | °C |
Key Features
- Wide operating VCC range from 2 V to 6 V
- Inputs accept voltages up to 6 V
- 3-state outputs for bus isolation
- Direction-control (DIR) input for data transmission direction
- Output-enable (OE) input for enabling/disabling the device
- Low drive and slow edge rates to minimize output ringing
- Available in various packages including TSSOP, SOIC, PDIP, and more
Applications
- Professional Audio Systems
- Video and Signage Systems
- Appliances and Consumer Electronics
- Factory Automation and Control Systems
- General-purpose bus interface applications where output ringing is a concern
Q & A
- What is the operating VCC range of the SN74AC245PWR?
The operating VCC range is from 2 V to 6 V.
- What is the maximum propagation delay time of the SN74AC245PWR at VCC = 5 V?
The maximum propagation delay time (tPLH/tPHL) is 6.5 ns at VCC = 5 V.
- How do you control the direction of data transmission in the SN74AC245PWR?
The direction of data transmission is controlled by the direction-control (DIR) input.
- What is the purpose of the output-enable (OE) input in the SN74AC245PWR?
The output-enable (OE) input is used to enable or disable the device, effectively isolating the buses when disabled.
- What are the typical applications of the SN74AC245PWR?
Typical applications include professional audio, video and signage, appliances, and factory automation and control systems.
- What are the available packages for the SN74AC245PWR?
The device is available in various packages such as TSSOP, SOIC, PDIP, and more.
- How do you handle unused inputs on the SN74AC245PWR?
Unused inputs must be held at VCC or GND to ensure proper device operation.
- What is the maximum continuous output current per output?
The maximum continuous output current per output is 50 mA.
- What is the storage temperature range for the SN74AC245PWR?
The storage temperature range is from -65°C to 150°C.
- How does the SN74AC245PWR minimize output ringing?
The device minimizes output ringing through its low drive and slow edge rates.
