Overview
The SN74AC245NSRG4 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 low-drive CMOS applications where output ringing is a concern. It features a wide operating voltage range from 2 V to 6 V and is suitable for various applications requiring reliable and efficient data transmission between two buses.
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 | - | -24 | mA |
| Low-Level Output Current (IOL) at VCC = 5 V | 24 | - | 24 | mA |
| Package Type | NS (SO, 20 pins) | - | - | - |
Key Features
- Wide operating VCC range from 2 V to 6 V
- Inputs accept voltages up to 6 V
- Low-drive CMOS technology to minimize output ringing
- Slow edge rates to reduce overshoot and undershoot
- Direction-control (DIR) input to select data transmission direction
- Output-enable (OE) input to isolate the buses
- Balanced output drive
- Available in various package types including NS (SO, 20 pins)
Applications
- Pro Audio
- Video and Signage
- Appliances
- Factory Automation and Control
- Other bus interface type applications where output ringing is a concern
Q & A
- What is the primary function of the SN74AC245NSRG4? The primary function is to facilitate asynchronous two-way communication between data buses.
- What is the operating voltage range of the SN74AC245NSRG4? The operating voltage 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, effectively isolating the buses.
- What are the typical applications for this device? Typical applications include Pro Audio, Video and Signage, Appliances, and Factory Automation and Control.
- What package types are available for the SN74AC245? The device is available in several package types, including NS (SO, 20 pins).
- How does the device minimize output ringing? The device uses low-drive CMOS technology and has slow edge rates to minimize output ringing.
- What are the propagation delay times for the SN74AC245 at VCC = 5 V? The propagation delay times (tPLH, tPHL) are typically 3.5 ns with a maximum of 6.5 ns.
- What are the high-level and low-level output currents at VCC = 5 V? The high-level output current (IOH) is -24 mA, and the low-level output current (IOL) is 24 mA.
- What is the recommended operating free-air temperature range? The recommended operating free-air temperature range is from -40°C to 85°C.
