Overview
The SN74HC245N is an octal bus transceiver produced by Texas Instruments, designed for asynchronous two-way communication between data buses. This device 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. The SN74HC245N minimizes external timing requirements, making it suitable for a variety of digital communication applications.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage (VCC) | 2 | 5 | 6 | V |
| High-Level Input Voltage (VIH) | 1.5 (VCC=2V) | 3.15 (VCC=4.5V) | 4.2 (VCC=6V) | V |
| Low-Level Input Voltage (VIL) | 0.5 (VCC=2V) | 1.35 (VCC=4.5V) | 1.8 (VCC=6V) | V |
| Operating Free-Air Temperature (TA) | -40 | 85 | °C | |
| Continuous Output Current (IO) | ±35 | mA | ||
| Input Transition Rise/Fall Time | 1000 (VCC=2V) | 500 (VCC=4.5V) | 400 (VCC=6V) | ns |
| Propagation Delay Time (tpd) | 12 (VCC=6V) | 18 (VCC=6V) | 27 (VCC=6V) | ns |
| Output Enable Time (ten OE) | 20 (VCC=6V) | 39 (VCC=6V) | 58 (VCC=6V) | ns |
| Output Disable Time (tdis OE) | 21 (VCC=6V) | 34 (VCC=6V) | 51 (VCC=6V) | ns |
Key Features
- Wide Operating Voltage Range of 2 V to 6 V
- High-Current 3-State Outputs Drive Bus Lines Directly or Up to 15 LSTTL Loads
- Low Power Consumption, 80-µA Max ICC
- Typical Propagation Delay Time (tpd) of 12 ns at VCC = 6 V
- ±6-mA Output Drive at 5 V
- Low Input Current of 1 µA Max
Applications
The SN74HC245N is suitable for various digital communication applications, including:
- Asynchronous two-way communication between data buses
- Data transmission in microprocessor systems
- Peripheral interface circuits
- Bidirectional data transfer in digital systems
Q & A
- What is the operating voltage range of the SN74HC245N?
The operating voltage range is from 2 V to 6 V.
- How many bits does the SN74HC245N support for data transmission?
The SN74HC245N supports 8-bit data transmission.
- What is the purpose of the DIR input in the SN74HC245N?
The DIR input determines the direction of data transmission between the A and B buses.
- How can the buses be isolated using the SN74HC245N?
The buses can be isolated by setting the OE input to a high voltage level.
- What is the typical propagation delay time of the SN74HC245N at VCC = 6 V?
The typical propagation delay time is 12 ns at VCC = 6 V.
- What is the maximum continuous output current of the SN74HC245N?
The maximum continuous output current is ±35 mA.
- What are the available package types for the SN74HC245N?
The available package types include PDIP, SOIC, SSOP, TSSOP, and others.
- Is the SN74HC245N RoHS compliant?
Yes, the SN74HC245N is RoHS compliant.
- What is the operating free-air temperature range for the SN74HC245N?
The operating free-air temperature range is from -40°C to 85°C.
- 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).
