Overview
The SN74ALS245ANSRG4 is an octal bus transceiver with 3-state outputs, designed and manufactured by Texas Instruments. This device is optimized 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, controlled by the direction-control (DIR) input. The output-enable (OE) input can 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 | 0.8 | - | 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 | 0 | - | 70 |
| Propagation Delay Time (tPLH, tPHL) | ns | 1 | - | 19 |
Key Features
- Octal bus transceiver with 3-state outputs for bidirectional data transmission.
- Direction-control (DIR) input to select data transmission direction (A to B or B to A).
- Output-enable (OE) input to disable the device and isolate the buses.
- Low power consumption and high-speed operation.
- Operating temperature range from 0°C to 70°C.
- Available in various package types, including SOIC, SOP, and SSOP.
Applications
- Electronic Point of Sale systems.
- Factory Automation and Control systems.
- Test and Measurement equipment.
- General-purpose data bus communication in digital systems.
Q & A
- What is the primary function of the SN74ALS245ANSRG4?
The primary function is to facilitate asynchronous two-way communication between data buses.
- How is the direction of data transmission controlled?
The direction is controlled by the logic level at the direction-control (DIR) input.
- What is the purpose of the output-enable (OE) input?
The OE input can disable the device, effectively isolating the buses.
- What are the operating voltage and temperature ranges?
The operating voltage range is 4.5V to 5.5V, and the operating temperature range is 0°C to 70°C.
- What are the typical propagation delay times?
The typical propagation delay times (tPLH, tPHL) range from 1 ns to 19 ns.
- What are the high-level and low-level output currents?
The high-level output current (IOH) is -12 mA to -15 mA, and the low-level output current (IOL) is 12 mA to 48 mA.
- What package types are available for this component?
Available package types include SOIC, SOP, and SSOP.
- What are some common applications of this component?
Common applications include Electronic Point of Sale systems, Factory Automation, Test and Measurement equipment, and general-purpose data bus communication.
- 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.
- What is the significance of the -1 version of the SN74ALS245A?
The -1 version has an increased recommended maximum IOL of 48 mA, but only if VCC is between 4.75 V and 5.25 V.
