Overview
The SN74ALS245A-1DWR is an octal bus transceiver with 3-state outputs, manufactured by Texas Instruments. This device is designed for asynchronous two-way communication between data buses, minimizing external timing requirements. It allows data transmission from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device, effectively isolating the buses.
Key Specifications
| Parameter | Unit | MIN | NOM | MAX |
|---|---|---|---|---|
| Supply Voltage (VCC) | V | 4.5 | 5 | 5.5 |
| High-Level Input Voltage (VIH) | V | 2 | 2 | |
| Low-Level Input Voltage (VIL) | V | 0.7 | 0.8 | 0.8 |
| High-Level Output Current (IOH) | mA | -12 | -15 | |
| Low-Level Output Current (IOL) | mA | 12 | 24 | 48† |
| Operating Free-Air Temperature (TA) | °C | -55 | 0 | 70 |
| Propagation Delay Time (tPLH, tPHL) | ns | 1 | 10 |
† Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V.
Key Features
- Octal bus transceiver with 3-state outputs
- Asynchronous two-way communication between data buses
- Direction-control (DIR) input to select data transmission direction
- Output-enable (OE) input to disable the device and isolate buses
- High drive capability: up to 48 mA low-level output current for the -1 version
- Operating temperature range: -55°C to 70°C
Applications
- Data bus communication in digital systems
- Microprocessor and memory interfaces
- Peripheral controllers and I/O ports
- Industrial control systems
- Telecommunication equipment
Q & A
- What is the primary function of the SN74ALS245A-1DWR?
The primary function is to facilitate asynchronous two-way communication between data buses. - 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 is the maximum low-level output current for the -1 version?
The maximum low-level output current for the -1 version is 48 mA. - What is the operating temperature range of the SN74ALS245A-1DWR?
The operating temperature range is -55°C to 70°C. - What are the typical applications of the SN74ALS245A-1DWR?
Typical applications include data bus communication in digital systems, microprocessor and memory interfaces, peripheral controllers, industrial control systems, and telecommunication equipment. - What is the recommended supply voltage range for the SN74ALS245A-1DWR?
The recommended supply voltage range is 4.5 V to 5.5 V. - How many pins does the SN74ALS245A-1DWR have?
The device has 20 pins. - What package types are available for the SN74ALS245A-1DWR?
Available package types include SOIC, SOP, and SSOP. - Is the SN74ALS245A-1DWR RoHS compliant?
Yes, the SN74ALS245A-1DWR is RoHS compliant.
