Overview
The SN74ALS245ADWR is an octal bus transceiver with 3-state outputs, designed for asynchronous two-way communication between data buses. This device is part of the ALS (Advanced Low-Power Schottky) logic family, which offers low power consumption and high speed. The SN74ALS245ADWR is used to transmit data from one bus to another, with the direction of data transmission controlled by the DIR input. The OE (output enable) input allows the outputs to be disabled, effectively isolating the buses.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC | Supply Voltage | 4.5 | - | 5.5 | V |
| VIH | High-Level Input Voltage | 2 | - | - | V |
| VIL | Low-Level Input Voltage | - | - | 0.8 | V |
| VOH | High-Level Output Voltage | 2.4 | 3.4 | - | V |
| VOL | Low-Level Output Voltage | - | - | 0.5 | V |
| tPLH | Propagation Delay Time (Low to High) | - | 8 | - | ns |
| tPHL | Propagation Delay Time (High to Low) | - | 8 | - | ns |
| IOH | Source Current | -15 | - | - | mA |
| IOL | Sink Current | - | - | 24 | mA |
Key Features
- 3-State Outputs: The outputs can drive bus lines directly and can be put into high impedance mode through the OE pin.
- PNP Inputs: Reduces DC loading on bus lines.
- Hysteresis on Bus Inputs: Improves noise margins.
- Low Power Consumption: Part of the ALS logic family, which is known for low power consumption.
- High Speed: Typical propagation delay times of 8 ns.
- Direction Control: Data transmission direction controlled by the DIR input.
- Output Enable: Outputs can be disabled via the OE input, isolating the buses.
Applications
- Building Automation: Used in control and communication systems within buildings.
- Electronic Point of Sale: Employed in POS systems for data transmission.
- Factory Automation and Control: Utilized in industrial control systems.
- Test and Measurement: Used in various test and measurement equipment.
Q & A
- What is the primary function of the SN74ALS245ADWR?
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 DIR input; a low level sends data from B to A, and a high level sends data from A to B.
- What is the purpose of the OE input?
The OE input allows the outputs to be disabled, effectively isolating the buses when set high.
- What are the typical propagation delay times for this device?
The typical propagation delay times are 8 ns.
- What type of inputs does the SN74ALS245ADWR have?
The device has PNP inputs which reduce DC loading on bus lines.
- What is the significance of hysteresis on bus inputs?
Hysteresis improves noise margins, enhancing the reliability of the device in noisy environments.
- What is the recommended operating voltage range for the SN74ALS245ADWR?
The recommended operating voltage range is between 4.5 V and 5.5 V.
- What are some common applications of the SN74ALS245ADWR?
Common applications include building automation, electronic point of sale, factory automation, and test and measurement.
- How does the ALS logic family benefit the SN74ALS245ADWR?
The ALS logic family provides low power consumption and high speed, making the device efficient and reliable.
- What is the package type for the SN74ALS245ADWR?
The device is available in various packages, including SOIC, SSOP, and PDIP among others.
