Overview
The SN74AVC20T245ZQLR is a 20-bit dual-supply bus transceiver produced by Texas Instruments. This component is designed for asynchronous communication between data buses and is optimized for low-voltage bidirectional translation. It operates with two separate configurable power-supply rails, allowing each port to function over a wide voltage range from 1.2 V to 3.6 V. The device is particularly useful in mixed-voltage systems, enabling seamless data transfer between different voltage nodes.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| Supply Voltage (VCCA/VCCB) | 1.2 | 3.6 | V |
| Operating Temperature | -40 | 85 | °C |
| High-Level Input Voltage (VIH) | 1.6 (for 1.95 V to 2.7 V) | 2 (for 2.7 V to 3.6 V) | V |
| Low-Level Input Voltage (VIL) | 0.7 (for 1.95 V to 2.7 V) | 0.8 (for 2.7 V to 3.6 V) | V |
| Output Voltage Range | 0 | VCCO | V |
| High-Level Output Current (IOH) | -12 (for 3 V to 3.6 V) | -12 | mA |
| Low-Level Output Current (IOL) | 12 (for 3 V to 3.6 V) | 12 | mA |
| Input Transition Rise or Fall Rate | 5 | 5 | ns/V |
| Package Thermal Impedance (θJA) | 42 | 42 | °C/W |
Key Features
- Fully configurable dual-rail design allowing each port to operate over the full 1.2-V to 3.6-V power-supply range.
- Overvoltage-tolerant inputs/outputs for mixed-voltage-mode data communications.
- VCC isolation feature ensuring both ports are in the high-impedance state if either VCC input is at GND.
- Ioff supports partial-power-down mode operation to prevent damaging current backflow.
- I/Os are 4.6-V tolerant.
- High data rates: up to 380 Mbps for 1.8-V to 3.3-V translation.
- Latch-up performance exceeds 100 mA per JESD 78, Class II.
- ESD protection exceeds JESD 22: 8000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
Applications
- Mixed-voltage systems requiring bidirectional data translation.
- Asynchronous communication between data buses in various voltage domains.
- Partial-power-down applications where power management is critical.
- Systems requiring high data transfer rates and low power consumption.
- Industrial and automotive applications where robust ESD protection is necessary.
Q & A
- What is the voltage range for the supply voltages VCCA and VCCB?
The supply voltages VCCA and VCCB can range from 1.2 V to 3.6 V.
- What is the maximum data rate supported by the SN74AVC20T245?
The maximum data rate is up to 380 Mbps for 1.8-V to 3.3-V translation.
- How does the VCC isolation feature work?
If either VCC input is at GND, both ports are in the high-impedance state.
- What is the purpose of the Ioff feature?
The Ioff feature supports partial-power-down mode operation to prevent damaging current backflow.
- What is the ESD protection level of the SN74AVC20T245?
The device exceeds JESD 22 standards with 8000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model protection.
- What are the typical operating temperatures for the SN74AVC20T245?
The operating temperature range is from -40°C to 85°C.
- How do the control inputs (DIR and OE) function?
The control inputs are supplied by VCCA and control the direction of data transmission and output enable/disable.
- What is the significance of the overvoltage-tolerant inputs/outputs?
The overvoltage-tolerant inputs/outputs allow for mixed-voltage-mode data communications, enabling the device to operate with different voltage levels.
- What are the package options available for the SN74AVC20T245?
The device is available in TSSOP, TVSOP, and VFBGA packages.
- What is the storage temperature range for the SN74AVC20T245?
The storage temperature range is from -65°C to 150°C.
