Overview
The SN74AC245PW, produced by Texas Instruments, is an octal bus transceiver with 3-state outputs designed for asynchronous two-way communication between data buses. This device is part of the SNx4AC245 family and is particularly useful in applications where data needs to be transmitted between two buses efficiently. The SN74AC245PW operates over a wide VCC range from 2 V to 6 V, making it versatile for various system designs.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | 6 | V | |
| Input Voltage (VI) | -0.5 | VCC + 0.5 | V | |
| Output Voltage (VO) | -0.5 | VCC + 0.5 | V | |
| Operating Free-Air Temperature (TA) | -40 | 85 | °C | |
| Propagation Delay Time (tPLH, tPHL) at VCC = 5 V | 1.5 | 3.5 | 6.5 | ns |
| Output Enable Time (tPZH, tPZL) at VCC = 5 V | 1.5 | 5 | 8.5 | ns |
| High-Level Output Current (IOH) at VCC = 5 V | -24 | mA | ||
| Low-Level Output Current (IOL) at VCC = 5 V | 24 | mA | ||
| Package Type | TSSOP (20 pins) |
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 to select data transmission direction
- Output enable (OE) input to disable the device and isolate the buses
- Low drive and slow edge rates to minimize output ringing
- CMOS technology for balanced output drive
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 SN74AC245PW?
The primary function is to facilitate asynchronous two-way communication between data buses.
- What is the operating VCC range of the SN74AC245PW?
The operating VCC range is from 2 V to 6 V.
- How does the direction control (DIR) input work?
The DIR input determines the direction of data transmission between the A and B buses.
- What is the purpose of the output enable (OE) input?
The OE input can be used to disable the device and isolate the buses.
- What are the typical applications of the SN74AC245PW?
Typical applications include Pro Audio, Video and Signage, Appliances, and Factory Automation and Control systems.
- How does the device minimize output ringing?
The device uses low drive and slow edge rates to minimize output ringing.
- What is the maximum propagation delay time at VCC = 5 V?
The maximum propagation delay time (tPLH, tPHL) at VCC = 5 V is 6.5 ns.
- What is the package type of the SN74AC245PW?
The package type is TSSOP with 20 pins.
- What are the recommended operating conditions for input and output currents?
Load currents should not exceed 25 mA per output and 75 mA total for the part. Outputs should not be pulled above VCC.
- How should unused inputs be handled to ensure proper device operation?
Unused inputs must be held at VCC or GND to ensure proper device operation.
