Overview
The SN74AVC2T45DCUTE4, produced by Texas Instruments, is a 2-bit, dual-supply bus transceiver designed for asynchronous communication between two data buses. This device is part of the AVC family and is known for its universal low-voltage bidirectional translation and level-shifting capabilities. It supports a wide range of supply voltages from 1.2V to 3.6V, making it versatile for various applications. The device features a configurable dual-rail design, allowing each port to operate independently over different voltage ranges.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VCCA Supply Voltage | 1.2 to 3.6 | V |
| VCCB Supply Voltage | 1.2 to 3.6 | V |
| Input Voltage Range | -0.5 to 6.5 | V |
| Output Voltage Range | -0.5 to VCCA + 0.5 (A port), -0.5 to VCCB + 0.5 (B port) | V |
| Continuous Output Current | -50 to 50 | mA |
| Junction Temperature | -65 to 150 | °C |
| Maximum Data Rates | 420 Mbps (3.3-V to 5-V translation), 210 Mbps (translate to 3.3 V), 140 Mbps (translate to 2.5 V), 75 Mbps (translate to 1.8 V) | Mbps |
| Package Types | DCT (SSOP, 8), DCU (VSSOP, 8), DDF (SOT-23, 8), YZP (DSBGA, 8) | |
| Junction-to-Ambient Thermal Resistance (RθJA) | 183.1 (DCT), 246.9 (DCU), 203.2 (DDF), 105.8 (YZP) | °C/W |
Key Features
- Fully configurable dual-rail design allowing each port to operate over the full 1.2V to 3.6V power-supply range.
- Universal low-voltage bidirectional translation and level-shifting between any of the 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V voltage nodes.
- VCC isolation feature: if either VCC input is at GND, both ports are in the high-impedance state.
- DIR input circuit referenced to VCCA.
- Low power consumption with a maximum ICC of 4 μA.
- Supports partial-power-down mode operation using Ioff circuitry.
- High output drive capability: ±24 mA at 3.3 V.
- ESD protection exceeds JESD 22 standards: 4000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model.
Applications
- Personal electronic devices.
- Industrial automation and control systems.
- Enterprise and data center equipment.
- Telecommunications infrastructure.
- Any system requiring asynchronous communication between two data buses with different voltage levels.
Q & A
- What is the primary function of the SN74AVC2T45?
The SN74AVC2T45 is a 2-bit, dual-supply bus transceiver designed for asynchronous communication between two data buses, allowing for bidirectional translation and level-shifting between different voltage levels.
- What are the supported supply voltage ranges for VCCA and VCCB?
VCCA and VCCB can operate over the range of 1.2V to 3.6V.
- What is the maximum data rate supported by the SN74AVC2T45?
The device supports maximum data rates of 420 Mbps (3.3-V to 5-V translation), 210 Mbps (translate to 3.3 V), 140 Mbps (translate to 2.5 V), and 75 Mbps (translate to 1.8 V).
- What is the purpose of the DIR input circuit?
The DIR input circuit, referenced to VCCA, controls the direction of data transmission between the A and B ports.
- Does the SN74AVC2T45 support partial-power-down mode operation?
Yes, the device supports partial-power-down mode operation using Ioff circuitry, which disables the outputs to prevent damaging current backflow when powered down.
- What are the available package types for the SN74AVC2T45?
The device is available in DCT (SSOP, 8), DCU (VSSOP, 8), DDF (SOT-23, 8), and YZP (DSBGA, 8) packages.
- What is the junction-to-ambient thermal resistance for the different packages?
The junction-to-ambient thermal resistance (RθJA) varies by package: 183.1°C/W for DCT, 246.9°C/W for DCU, 203.2°C/W for DDF, and 105.8°C/W for YZP.
- Does the SN74AVC2T45 have built-in ESD protection?
Yes, the device has ESD protection that exceeds JESD 22 standards: 4000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- What is the significance of the VCC isolation feature?
The VCC isolation feature ensures that if either VCC input is at GND, both ports are in the high-impedance state, preventing unintended data transmission.
- How does the device handle input and output voltage levels?
The device's input circuitry on both A and B ports must have a logic HIGH or LOW level applied to prevent excess current leakage. The output voltage range is determined by the supply voltage of the device it is driving.
