Overview
The SN74ABT245BDWRG4 is an octal bus transceiver produced by Texas Instruments. This device is designed for asynchronous 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 output-enable (OE) input can be used to disable the device, effectively isolating the buses. The SN74ABT245BDWRG4 is fully specified for hot-insertion applications and features power-up 3-state and Ioff circuitry to prevent damaging current backflow and driver conflict during power transitions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | SOIC - DW | |
| Pins | 20 | |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage Range | 4.5 to 5.5 | V |
| High-Level Input Voltage | 2 | V |
| Low-Level Input Voltage | 0.8 | V |
| High-Level Output Current | -32 | mA |
| Low-Level Output Current | 64 | mA |
| Input Transition Rise or Fall Rate | 5 | ns/V |
| Power-Up Ramp Rate | 200 | μs/V |
Key Features
- Typical VOLP (Output Ground Bounce) < 1 V at VCC = 5 V, TA = 25°C
- Ioff and Power-Up 3-State Support for Hot Insertion
- High-Drive Outputs (32-mA IOH, 64-mA IOL)
- Latch-Up Performance Exceeds 500 mA Per JEDEC Standard JESD 17
- ESD Protection Exceeds JESD 22: 2000-V Human-Body Model (A114-A), 200-V Machine Model (A115-A)
Applications
The SN74ABT245BDWRG4 is suitable for various applications requiring asynchronous communication between data buses, such as:
- Data transmission and isolation in computer systems
- Hot-swappable modules and backplanes
- Embedded systems requiring bus communication
- Industrial control systems
Q & A
- What is the primary function of the SN74ABT245BDWRG4?
The primary function is to transmit data between two data buses (A and B) based on the direction-control input.
- What is the purpose of the output-enable (OE) input?
The OE input is used to disable the device, effectively isolating the buses.
- What are the operating temperature ranges for this device?
The operating temperature range is from -40°C to 85°C.
- What is the supply voltage range for the SN74ABT245BDWRG4?
The supply voltage range is from 4.5 V to 5.5 V.
- Does the device support hot-insertion applications?
Yes, it is fully specified for hot-insertion applications using Ioff and power-up 3-state circuitry.
- What kind of ESD protection does the device offer?
The device offers ESD protection exceeding JESD 22 standards: 2000-V Human-Body Model (A114-A) and 200-V Machine Model (A115-A).
- What are the high-level and low-level output currents for this device?
The high-level output current is -32 mA, and the low-level output current is 64 mA.
- How should the OE input be managed during power-up or power-down to ensure a high-impedance state?
The OE input should be tied to VCC through a pull-up resistor to ensure the high-impedance state during power-up or power-down.
- What is the input transition rise or fall rate for this device?
The input transition rise or fall rate is 5 ns/V.
- What is the power-up ramp rate for the SN74ABT245BDWRG4?
The power-up ramp rate is 200 μs/V.
