Overview
The SN74LVC2T45DCTT is a 2-bit dual-supply noninverting bus transceiver produced by Texas Instruments. This device is designed for asynchronous communication between two data buses, allowing for universal low-voltage bidirectional translation between various voltage nodes such as 1.8V, 2.5V, 3.3V, and 5V. The transceiver features a fully configurable dual-rail design, enabling each port to operate over the full 1.65-V to 5.5-V power-supply range. This makes it highly versatile for use in a wide range of applications requiring voltage level translation.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SSOP (DCT) - 8 pins |
| Operating Temperature Range | -40°C to 85°C |
| Supply Voltage (VCCA and VCCB) | 1.65V to 5.5V |
| Output Current | ±24 mA at 3.3 V |
| Data Rate | Up to 420 Mbps (3.3V to 5V translation) |
| Propagation Delay | 3.9 ns |
| ESD Protection | 4000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model |
| Latch-up Performance | Exceeds 100 mA per JESD 78, Class II |
| Power Consumption | Maximum ICC of 4 µA |
Key Features
- Fully configurable dual-rail design allowing each port to operate over the full 1.65-V to 5.5-V power-supply range.
- 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.
- Available in the Texas Instruments NanoFree™ package.
- Supports high-speed translation with data rates up to 420 Mbps.
- Ioff supports Partial-Power-Down mode operation, preventing damaging current backflow.
- Balanced high-drive CMOS push-pull outputs.
- ESD protection exceeds JESD 22 standards.
Applications
The SN74LVC2T45DCTT is suitable for a variety of applications that require voltage level translation between different voltage domains. These include:
- Asynchronous communication between two data buses.
- Voltage level translation in mixed-voltage systems.
- High-speed data transmission applications.
- Partial-power-down mode operations in power-sensitive designs.
- Systems requiring ESD protection and latch-up performance.
Q & A
- What is the primary function of the SN74LVC2T45DCTT?
The primary function is to act as a 2-bit dual-supply noninverting bus transceiver, enabling bidirectional voltage level translation between different voltage domains.
- What is the operating temperature range of the SN74LVC2T45DCTT?
The operating temperature range is -40°C to 85°C.
- What are the supported supply voltage ranges for VCCA and VCCB?
Both VCCA and VCCB can operate over the full 1.65-V to 5.5-V power-supply range.
- What is the maximum data rate supported by the SN74LVC2T45DCTT?
The device supports data rates up to 420 Mbps for translation from 3.3V to 5V.
- How does the VCC isolation feature work?
If either VCC input is at GND, both ports of the device are in the high-impedance state.
- What is the purpose of the Ioff circuitry in the SN74LVC2T45DCTT?
The Ioff circuitry disables the outputs to prevent damaging current backflow when the device is in Partial-Power-Down mode.
- What type of ESD protection does the SN74LVC2T45DCTT offer?
The device offers ESD protection exceeding JESD 22 standards, including 4000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- What is the maximum output current of the SN74LVC2T45DCTT?
The maximum output current is ±24 mA at 3.3 V.
- How does the DIR input circuit affect the operation of the SN74LVC2T45DCTT?
The DIR input circuit, referenced to VCCA, controls the direction of data transmission between the A and B ports.
- What is the significance of the balanced high-drive CMOS push-pull outputs in the SN74LVC2T45DCTT?
The balanced outputs allow the device to sink and source similar currents, ensuring reliable and efficient data transmission.
- Is the SN74LVC2T45DCTT RoHS compliant?
