Overview
The SN74AC245DWR is an octal bus transceiver produced by Texas Instruments, designed for asynchronous two-way communication between data buses. This device is part of the SNx4AC245 family and is optimized for use in various applications where reliable and efficient data transmission is crucial. The SN74AC245DWR operates with a wide VCC range from 2 V to 6 V, making it versatile for different system requirements. It features a control-function implementation that minimizes external timing requirements, and it includes output-enable (OE) and direction-control (DIR) inputs to manage data flow and bus isolation effectively.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | -0.5 | - | 7 | V |
| Input Voltage (VI) | -0.5 | - | VCC + 0.5 | V |
| Output Voltage (VO) | -0.5 | - | VCC + 0.5 | V |
| Operating Free-Air Temperature (TA) | -55 | - | 125 | °C |
| High-Level Output Current (IOH) at VCC = 5.5 V | -24 | - | - | mA |
| Low-Level Output Current (IOL) at VCC = 5.5 V | 24 | - | - | mA |
| Propagation Delay Time (tPLH) at VCC = 5 V | 1.5 | 3.5 | 6.5 | ns |
| Junction-to-Ambient Thermal Resistance (RθJA) | - | - | 98.6 | °C/W |
Key Features
- Wide operating VCC range from 2 V to 6 V
- Inputs accept voltages up to 6 V
- Maximum propagation delay time of 7 ns at 5 V
- Output-enable (OE) and direction-control (DIR) inputs for flexible data transmission and bus isolation
- Low drive and slow edge rates to minimize output ringing and overshoot
- CMOS technology with balanced output drive
- Available in various package options including SOIC, SSOP, VSSOP, TSSOP, and VQFN
Applications
- Pro Audio systems
- Video and Signage systems
- Appliances
- Factory Automation and Control systems
- Bus interface applications where output ringing is a concern
Q & A
- What is the primary function of the SN74AC245DWR?
The SN74AC245DWR is designed for asynchronous two-way communication between data buses, allowing data transmission from the A bus to the B bus or vice versa based on the direction-control input.
- What is the operating voltage range of the SN74AC245DWR?
The device operates with a VCC range from 2 V to 6 V.
- How do the OE and DIR inputs function in the SN74AC245DWR?
The output-enable (OE) input can disable the device to isolate the buses, and the direction-control (DIR) input determines the direction of data transmission between the A and B buses.
- What are the key thermal characteristics of the SN74AC245DWR?
The junction-to-ambient thermal resistance (RθJA) for the SOIC package is approximately 98.6 °C/W.
- What are the typical propagation delay times for the SN74AC245DWR?
The propagation delay time (tPLH) at VCC = 5 V is typically 3.5 ns, with a maximum of 6.5 ns.
- What are the recommended operating conditions for input and output currents?
Load currents should not exceed 25 mA per output, and total current for the part should not exceed 75 mA. Outputs should not be pulled above VCC.
- How does the SN74AC245DWR minimize output ringing?
The device uses low drive and slow edge rates to minimize output ringing and overshoot.
- What are some common applications for the SN74AC245DWR?
Common applications include Pro Audio, Video and Signage, Appliances, and Factory Automation and Control systems.
- What package options are available for the SN74AC245DWR?
The device is available in various packages such as SOIC, SSOP, VSSOP, TSSOP, and VQFN.
- How should unused inputs be handled to ensure proper device operation?
All unused inputs must be held at VCC or GND to ensure proper device operation.
