Overview
The SN74AVC20T245DGGRG4, produced by Texas Instruments, is a 20-bit dual-supply bus transceiver designed for asynchronous communication between data buses. This device allows data transmission from the A bus to the B bus or vice versa, controlled by the direction-control (DIR) input. It features output-enable (OE) inputs to isolate the buses when necessary. The SN74AVC20T245 is optimized for partial-power-down applications and includes VCC isolation to prevent current backflow when powered down.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Bits | 20 | |
| Package Type | TSSOP - DGG | |
| Operating Temperature Range | -40°C to 85°C | |
| Continuous Output Current | ±50 mA | |
| Continuous Current through VCCA, VCCB, and GND | ±100 mA | |
| Package Thermal Impedance (θJA) | 64°C/W (DGG package) | |
| Storage Temperature Range | -65°C to 150°C | |
| Switching Characteristics (Typical) | tPLH: 3.8 ns, tPHL: 3.8 ns | ns |
Key Features
- Dual-supply operation allows for voltage translation between 1.2 V and 3.3 V
- Control inputs (DIR and OE) are supplied by VCCA
- VCC isolation feature ensures high-impedance state during power-up or power-down
- Ioff circuitry for partial-power-down applications
- High-impedance state during power-up or power-down
Applications
The SN74AVC20T245 is suitable for various applications requiring asynchronous communication between data buses, such as in mixed-voltage systems, data transfer between different voltage domains, and in systems where power management is critical. It is particularly useful in embedded systems, industrial control systems, and other electronic devices that require reliable and efficient data transmission.
Q & A
- What is the primary function of the SN74AVC20T245? The primary function is to act as a 20-bit dual-supply bus transceiver for asynchronous communication between data buses.
- What are the operating voltage ranges for this device? The device operates with VCCA and VCCB ranging from 1.2 V to 3.3 V.
- How is the direction of data transmission controlled? The direction of data transmission is controlled by the direction-control (DIR) input.
- What is the purpose of the output-enable (OE) input? The OE input is used to disable the outputs, isolating the buses when necessary.
- Is the SN74AVC20T245 suitable for partial-power-down applications? Yes, it includes Ioff circuitry for partial-power-down applications.
- What is the maximum continuous output current? The maximum continuous output current is ±50 mA.
- What is the storage temperature range for this device? The storage temperature range is -65°C to 150°C.
- What are the typical switching characteristics? Typical switching characteristics include tPLH and tPHL of 3.8 ns each.
- What is the package thermal impedance for the DGG package? The package thermal impedance for the DGG package is 64°C/W.
- Is the SN74AVC20T245 available in different package types? Yes, it is available in TSSOP - DGG, TVSOP - DGV, and VFBGA - GQL/ZQL packages.
