Overview
The SN74HC245NSR is an octal bus transceiver produced by Texas Instruments, designed for asynchronous two-way communication between data buses. This device is part of the 74HC series, known for its high-performance and low-power consumption characteristics. 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 | Value | Unit |
|---|---|---|
| Operating Voltage Range | 2 to 6 | V |
| Operating Temperature Range | -40 to 85 | °C |
| Package Type | SOIC-20 | |
| Package Size | 12.80 mm × 7.50 mm | |
| Continuous Output Current | ±35 mA | |
| Output Drive at 5 V | ±6 mA | |
| Input Current | 1 µA Max | |
| Propagation Delay (typical) | 12 ns |
Key Features
- Wide operating voltage range of 2 V to 6 V, making it versatile for various applications.
- High-current 3-state outputs that can drive bus lines directly or up to 15 LSTTL loads.
- Low power consumption with a maximum ICC of 80 µA.
- Typical propagation delay of 12 ns, ensuring fast data transmission.
- Low input current of 1 µA maximum, reducing power consumption.
- Output-enable (OE) input for disabling the device and isolating the buses.
- Low drive and slow edge rates to minimize output ringing, overshoot, and undershoot.
Applications
The SN74HC245NSR is suitable for a variety of bus interface applications where reliable and efficient data transmission is crucial. It is particularly useful in systems where output ringing is a concern, such as in:
- Microcontroller and system board interfaces.
- LED and relay control circuits.
- General-purpose logic and data transmission systems.
- Applications requiring low power consumption and high reliability.
Q & A
- What is the operating voltage range of the SN74HC245NSR?
The operating voltage range is from 2 V to 6 V.
- What is the typical propagation delay of the SN74HC245NSR?
The typical propagation delay is 12 ns.
- How can the buses be isolated using the SN74HC245NSR?
The buses can be isolated by using the output-enable (OE) input to disable the device.
- What is the maximum continuous output current of the SN74HC245NSR?
The maximum continuous output current is ±35 mA.
- What is the package type of the SN74HC245NSR?
The package type is SOIC-20.
- What is the operating temperature range of the SN74HC245NSR?
The operating temperature range is from -40°C to 85°C.
- How many LSTTL loads can the SN74HC245NSR drive?
The SN74HC245NSR can drive up to 15 LSTTL loads.
- What is the maximum input current of the SN74HC245NSR?
The maximum input current is 1 µA.
- Is the SN74HC245NSR suitable for low-power applications?
- How does the SN74HC245NSR minimize output ringing?
The device minimizes output ringing through its low drive and slow edge rates.
