Overview
The SN74HC245DBR is an octal bus transceiver with 3-state outputs, manufactured by Texas Instruments. This device is designed for asynchronous two-way communication between data buses, allowing 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 SN74HC245DBR operates over a wide voltage range from 2 V to 6 V, making it versatile for various applications.
Key Specifications
| Parameter | Min | Nom | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 2 | 5 | 6 | V |
| VIH High-Level Input Voltage | 1.5 (VCC=2V), 3.15 (VCC=4.5V), 4.2 (VCC=6V) | V | ||
| VIL Low-Level Input Voltage | 0.5 (VCC=2V), 1.35 (VCC=4.5V), 1.8 (VCC=6V) | V | ||
| Operating Free-Air Temperature | -40 | 85 | °C | |
| Continuous Output Current | ±35 | mA | ||
| Package Type | 20-SSOP (0.209", 5.30mm Width) |
Key Features
- Wide operating voltage range from 2 V to 6 V.
- High-current 3-state outputs capable of driving bus lines directly or up to 15 LSTTL loads.
- Output-enable (OE) input to disable the device and isolate the buses.
- Direction-control (DIR) input to control data transmission between A and B buses.
- Push-pull output type with current capabilities of 7.8 mA for both high and low states.
- Surface mount package with 20 pins.
Applications
The SN74HC245DBR is suitable for various applications requiring asynchronous two-way communication between data buses. These include:
- Data transmission and reception in microprocessor systems.
- Bus interfacing and isolation in digital systems.
- Peripheral device communication in embedded systems.
- General-purpose logic and data transfer applications.
Q & A
- What is the primary function of the SN74HC245DBR?
The SN74HC245DBR is an octal bus transceiver designed for asynchronous two-way communication between data buses.
- What is the operating voltage range of the SN74HC245DBR?
The device operates over a voltage range from 2 V to 6 V.
- How does the direction-control (DIR) input work?
The DIR input controls the direction of data transmission between the A and B buses.
- What is the purpose of the output-enable (OE) input?
The OE input can be used to disable the device, effectively isolating the buses.
- What type of output does the SN74HC245DBR have?
The device has push-pull outputs.
- What is the maximum continuous output current of the SN74HC245DBR?
The maximum continuous output current is ±35 mA.
- What is the operating temperature range of the SN74HC245DBR?
The device operates over a temperature range from -40°C to 85°C.
- What package type is the SN74HC245DBR available in?
The device is available in a 20-SSOP package.
- Can the SN74HC245DBR drive LSTTL loads?
Yes, it can drive up to 15 LSTTL loads.
- How many bits per element does the SN74HC245DBR have?
The device has 8 bits per element.
