Overview
The SN74AVCH2T45DCUR is a dual-bit, dual-supply bus transceiver manufactured by Texas Instruments. This device is designed for asynchronous communication between two data buses and supports universal low-voltage bidirectional translation and level-shifting. The A ports track VCCA and accept supply voltages from 1.2V to 3.6V, while the B ports track VCCB and also accept supply voltages from 1.2V to 3.6V. This allows for level-shifting between various voltage nodes such as 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V. The device features active bus-hold circuitry, VCC isolation, and partial power-down mode operation, making it suitable for a wide range of applications requiring voltage translation and data transmission between different voltage domains.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | VSSOP (DCU) | |
| Pins | 8 | |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage (VCCA and VCCB) | 1.2 to 3.6 | V |
| High-Level Input Voltage (Data Inputs) | 0.65 * VCCI to VCCI | V |
| Low-Level Input Voltage (Data Inputs) | 0.35 * VCCI to 0.8 | V |
| Maximum Data Rates | 500 Mbps (1.8V to 3.3V), 320 Mbps (< 1.8V to 3.3V), 280 Mbps (Level-Shifting to 1.5V), 240 Mbps (Level-Shifting to 1.2V) | Mbps |
| Junction-to-Ambient Thermal Resistance (RθJA) | 246.9 | °C/W |
Key Features
- Available in the Texas Instruments NanoFree™ Package
- VCC Isolation: Ensures outputs are in high-impedance state if either VCC input is at GND
- 2-Rail Design: Supports separate configurable power-supply rails for A and B ports
- I/Os are 4.6V Tolerant
- Partial Power-Down-Mode Operation: Prevents damaging current backflow when powered down
- Active Bus-Hold Circuitry: Holds unused or un-driven inputs at a valid logic state
- Maximum Data Rates: Up to 500 Mbps depending on voltage levels
- ESD Protection: Exceeds JESD 22 standards
- Latch-Up Performance: Exceeds 100mA per JESD 78, Class II
Applications
The SN74AVCH2T45DCUR is suitable for various applications requiring voltage translation and level-shifting between different voltage domains. These include:
- Asynchronous communication between two data buses
- Universal low-voltage bidirectional translation
- Level-shifting between 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V voltage nodes
- Partial power-down mode applications
- Systems requiring active bus-hold circuitry to maintain valid logic states on unused inputs
Q & A
- What is the primary function of the SN74AVCH2T45DCUR?
The primary function is to act as a dual-bit, dual-supply bus transceiver for asynchronous communication between two data buses, supporting universal low-voltage bidirectional translation and level-shifting.
- What are the acceptable supply voltage ranges for VCCA and VCCB?
The supply voltage ranges for both VCCA and VCCB are from 1.2V to 3.6V.
- What is the maximum data rate supported by the SN74AVCH2T45DCUR?
The maximum data rate is up to 500 Mbps, depending on the voltage levels used.
- What is the purpose of the active bus-hold circuitry?
The active bus-hold circuitry holds unused or un-driven inputs at a valid logic state.
- Does the SN74AVCH2T45DCUR support partial power-down mode operation?
- What is the significance of VCC isolation in the SN74AVCH2T45DCUR?
VCC isolation ensures that if either VCC input is at GND, both outputs are in the high-impedance state.
- What are the thermal resistance values for the VSSOP (DCU) package?
The junction-to-ambient thermal resistance (RθJA) is 246.9 °C/W.
- Is the SN74AVCH2T45DCUR ESD protected?
- What is the latch-up performance of the SN74AVCH2T45DCUR?
- In what package types is the SN74AVCH2T45 available?
