Overview
The SN74AVC2T45DCUTG4, produced by Texas Instruments, is a 2-bit, dual-supply bus transceiver designed for asynchronous communication between two data buses. This device supports universal low-voltage bidirectional translation and level-shifting between various voltage nodes, including 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V. The transceiver features two separate configurable power-supply rails, VCCA and VCCB, which allow it to operate with different voltage levels on each port. The direction-control (DIR) input determines the direction of data transmission between the A and B ports, enabling flexible data transfer in various system configurations.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCCA, VCCB) | 1.2V to 3.6V | V |
| Input Voltage (A and B ports) | -0.5 to 4.6V | V |
| Output Voltage (A and B ports) | -0.5 to VCCA + 0.5V (A port), -0.5 to VCCB + 0.5V (B port) | V |
| Continuous Output Current | ±50 mA | mA |
| Propagation Delay (Low to High, High to Low) | 2.2 ns to 3.4 ns (depending on VCCA and VCCB) | ns |
| Operating Temperature Range | -40°C to 85°C | °C |
| Package Types | DCT (SSOP, 8 pins), DCU (VSSOP, 8 pins), YZP (DSBGA, 8 pins), DDF (SOT-23, 8 pins) |
Key Features
- Dual-bit, dual-supply bus transceiver for asynchronous communication between two data buses.
- Supports universal low-voltage bidirectional translation and level-shifting between 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V voltage nodes.
- Configurable power-supply rails (VCCA and VCCB) for flexible voltage operation.
- Direction-control (DIR) input to determine data transmission direction.
- 3-state outputs to reduce power consumption and prevent bus contention.
- VCC isolation feature: if either VCC input is at GND, both ports are in the high-impedance state.
- Low propagation delay and high-speed data transfer.
Applications
- Asynchronous communication between different voltage domains in mixed-voltage systems.
- Data translation and level-shifting in various digital systems.
- Use in embedded systems, microcontrollers, and other digital logic circuits requiring voltage translation.
- Applications in telecommunications, industrial control systems, and consumer electronics.
Q & A
- What is the primary function of the SN74AVC2T45DCUTG4?
The primary function is to act as a 2-bit, dual-supply bus transceiver for asynchronous communication between two data buses, supporting universal low-voltage bidirectional translation and level-shifting.
- What voltage ranges does the SN74AVC2T45DCUTG4 support?
The device supports supply voltages from 1.2V to 3.6V for both VCCA and VCCB.
- How does the direction-control (DIR) input work?
The DIR input determines the direction of data transmission between the A and B ports, activating either the B-port outputs or the A-port outputs.
- What are the package options available for the SN74AVC2T45DCUTG4?
The device is available in DCT (SSOP, 8 pins), DCU (VSSOP, 8 pins), YZP (DSBGA, 8 pins), and DDF (SOT-23, 8 pins) packages.
- What is the operating temperature range of the SN74AVC2T45DCUTG4?
The operating temperature range is from -40°C to 85°C.
- What is the significance of the VCC isolation feature?
If either VCC input is at GND, both ports are in the high-impedance state, which helps in reducing power consumption and preventing bus contention.
- What are some typical applications of the SN74AVC2T45DCUTG4?
It is used in asynchronous communication between different voltage domains, data translation, and level-shifting in various digital systems, including embedded systems, microcontrollers, and other digital logic circuits.
- How does the device handle unused data inputs?
All unused data inputs must be held at VCCI or GND to prevent excess leakage current on the internal CMOS structure.
- What are the propagation delay characteristics of the SN74AVC2T45DCUTG4?
The propagation delay ranges from 2.2 ns to 3.4 ns depending on the supply voltages VCCA and VCCB.
- Is the SN74AVC2T45DCUTG4 suitable for high-speed data transfer?
Yes, it is designed for high-speed data transfer with low propagation delays.
