Overview
The SN74HC245N3, produced by Texas Instruments, is an octal bus transceiver with 3-state outputs. This component is designed for asynchronous two-way communication between data buses, allowing data transmission from the A bus to the B bus or vice versa based on the logic level at the direction-control (DIR) input. The device features an output-enable (OE) input that can isolate the buses when necessary. It operates over a wide voltage range and is suitable for various digital logic applications due to its high-current 3-state outputs and low power consumption.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | 5 | 6 | V |
| VIH High-Level Input Voltage (VCC = 2 V) | 1.5 | 1.5 | V | |
| VIH High-Level Input Voltage (VCC = 4.5 V) | 3.15 | 3.15 | V | |
| VIH High-Level Input Voltage (VCC = 6 V) | 4.2 | 4.2 | V | |
| VIL Low-Level Input Voltage (VCC = 2 V) | 0.5 | 0.5 | V | |
| VIL Low-Level Input Voltage (VCC = 4.5 V) | 1.35 | 1.35 | V | |
| VIL Low-Level Input Voltage (VCC = 6 V) | 1.8 | 1.8 | V | |
| TA Operating Free-Air Temperature | -40 | 85 | °C | |
| tpd Propagation Delay (A or B to B or A) at VCC = 2 V | 40 | 105 | 160 | ns |
| tpd Propagation Delay (A or B to B or A) at VCC = 4.5 V | 15 | 21 | 32 | ns |
| tpd Propagation Delay (A or B to B or A) at VCC = 6 V | 12 | 18 | 27 | ns |
Key Features
- Wide Operating Voltage Range: The SN74HC245N3 operates over a voltage range of 2 V to 6 V, making it versatile for various applications.
- High-Current 3-State Outputs: The device can drive bus lines directly or up to 15 LSTTL loads, ensuring robust signal transmission.
- Low Power Consumption: With a maximum ICC of 80 µA, this component is energy-efficient and suitable for low-power designs.
- Fast Switching Times: The propagation delay is as low as 12 ns at VCC = 6 V, ensuring fast data transmission.
- Low Input Current: The input current is typically 1 µA, minimizing the load on the driving circuit.
- Output Drive Capability: The device can drive up to ±6 mA at 5 V, providing strong output signals.
Applications
- Data Bus Communication: Ideal for asynchronous two-way communication between data buses in digital systems.
- Digital Logic Circuits: Suitable for use in various digital logic circuits requiring high-current 3-state outputs and low power consumption.
- Embedded Systems: Can be used in embedded systems where data needs to be transmitted between different buses efficiently.
- Industrial Control Systems: Applicable in industrial control systems that require reliable and fast data transmission.
Q & A
- What is the operating voltage range of the SN74HC245N3?
The SN74HC245N3 operates over a voltage range of 2 V to 6 V.
- What is the maximum propagation delay of the SN74HC245N3 at VCC = 6 V?
The maximum propagation delay at VCC = 6 V is 27 ns.
- How many LSTTL loads can the SN74HC245N3 drive?
The device can drive up to 15 LSTTL loads.
- What is the typical input current of the SN74HC245N3?
The typical input current is 1 µA.
- How does the output-enable (OE) input function?
The output-enable (OE) input can be used to disable the device, effectively isolating the buses.
- What is the maximum operating free-air temperature for the SN74HC245N3?
The maximum operating free-air temperature is 85°C.
- What are the package options available for the SN74HC245N3?
The device is available in various packages including PDIP, SOIC, SOP, SSOP, and TSSOP.
- Is the SN74HC245N3 compliant with any military standards?
Yes, on products compliant to MIL-PRF-38535, all parameters are tested unless otherwise noted.
- What is the purpose of the direction-control (DIR) input?
The direction-control (DIR) input determines the direction of data transmission between the A and B buses.
- 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.
