Overview
The SN74ABT245BPWG4, produced by Texas Instruments, is an octal bus transceiver designed for asynchronous communication between data buses. This device enables the transmission of data 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 allows for the device to be disabled, effectively isolating the buses. This component is fully specified for hot-insertion applications, utilizing Ioff and power-up 3-state circuitry to prevent damaging current backflow and driver conflict during power-up and power-down phases.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | TSSOP (PW) | - |
| Pins | 20 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage Range | -0.5 to 7 | V |
| High-Level Input Voltage | 2 | V |
| Low-Level Input Voltage | 0.8 | V |
| High-Level Output Current | -24 to -32 | mA |
| Low-Level Output Current | 48 to 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) and 200-V Machine Model (A115-A).
Applications
The SN74ABT245BPWG4 is suitable for various applications requiring asynchronous communication between data buses, such as:
- Data bus isolation and switching in computer systems.
- Hot-swappable modules and backplanes.
- High-speed data transmission systems.
- Embedded systems requiring robust bus communication.
Q & A
- What is the primary function of the SN74ABT245BPWG4?
The primary function is to transmit data between two data buses (A and B) based on the direction-control input.
- What is the operating temperature range of the SN74ABT245BPWG4?
The operating temperature range is -40°C to 85°C.
- What is the package type of the SN74ABT245BPWG4?
The package type is TSSOP (PW) with 20 pins.
- How does the output-enable (OE) input function?
The OE input can be used to disable the device, effectively isolating the buses.
- What is the significance of Ioff and power-up 3-state circuitry?
These features prevent damaging current backflow and driver conflict during power-up and power-down phases.
- What level of ESD protection does the SN74ABT245BPWG4 offer?
It exceeds JESD 22 standards with 2000-V Human-Body Model and 200-V Machine Model protection.
- What are the typical output ground bounce characteristics?
The typical VOLP is less than 1 V at VCC = 5 V, TA = 25°C.
- What are the high-level and low-level output current capabilities?
The high-level output current is -24 to -32 mA, and the low-level output current is 48 to 64 mA.
- How should the OE input be managed during power-up and power-down?
The OE input should be tied to VCC through a pullup resistor to ensure a high-impedance state.
- What are some common applications for the SN74ABT245BPWG4?
Common applications include data bus isolation, hot-swappable modules, high-speed data transmission systems, and embedded systems.
