Overview
The SN74LVC1T45DBVR is a single-bit, dual-supply, noninverting bus transceiver produced by Texas Instruments. This device is designed for asynchronous communication between two data buses and supports universal low-voltage bidirectional translation between various voltage nodes (1.8V, 2.5V, 3.3V, and 5V). The transceiver uses two separate configurable power-supply rails, with the A port tracking VCCA and the B port tracking VCCB, both of which can operate over the full 1.65V to 5.5V power-supply range. The direction-control (DIR) input determines the direction of data transmission between the A and B ports.
Key Specifications
| Parameter | Description |
|---|---|
| Package Type | SOT-23 (DBV), SOT (DRL), SC70 (DCK), USON (DPK), DSBGA (YZP) |
| Number of Pins | 6 |
| Supply Voltage Range (VCCA and VCCB) | 1.65V to 5.5V |
| Operating Temperature Range | -40°C to 85°C |
| Data Transfer Rate | Up to 420 Mbps (3.3V to 5V translation) |
| ESD Protection | 2000V Human-Body Model, 200V Machine Model, 1000V Charged-Device Model |
| Output Drive | ±24mA at 3.3V |
| Power Consumption | Maximum ICC of 4µA |
| Ioff Support | Partial-power-down mode operation |
Key Features
- Fully configurable dual-rail design allowing each port to operate over the full 1.65V to 5.5V 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 4µA.
- High output drive capability of ±24mA at 3.3V.
- Ioff supports partial-power-down mode operation.
- ESD protection exceeds JESD 22 standards (2000V Human-Body Model, 200V Machine Model, 1000V Charged-Device Model).
- Available in Texas Instruments NanoFree™ package technology.
Applications
The SN74LVC1T45DBVR is suitable for level-translation applications, enabling the interfacing of devices or systems operating at different interface voltages. It can be used in various scenarios such as:
- Unidirectional logic level-shifting applications.
- Bidirectional communication between data buses operating at different voltage levels (e.g., 1.8V, 2.5V, 3.3V, and 5V).
- Partial-power-down applications where the device needs to be powered down without causing current backflow.
Q & A
- What is the primary function of the SN74LVC1T45DBVR?
The SN74LVC1T45DBVR is a single-bit, dual-supply, noninverting bus transceiver designed for asynchronous communication between two data buses.
- What is the voltage range for VCCA and VCCB?
VCCA and VCCB can operate over the full 1.65V to 5.5V power-supply range.
- What is the maximum data transfer rate of the SN74LVC1T45DBVR?
The maximum data transfer rate is up to 420 Mbps when translating signals from 3.3V to 5V.
- What type of ESD protection does the SN74LVC1T45DBVR offer?
The device offers ESD protection exceeding JESD 22 standards: 2000V Human-Body Model, 200V Machine Model, and 1000V Charged-Device Model.
- What is the VCC isolation feature?
If either VCC input is at GND, both ports of the device are in the high-impedance state.
- What is the purpose of the DIR input?
The DIR input determines the direction of data transmission between the A and B ports.
- What is the power consumption of the SN74LVC1T45DBVR?
The device has a maximum ICC of 4µA.
- Does the SN74LVC1T45DBVR support partial-power-down mode?
Yes, the device supports partial-power-down mode operation using Ioff circuitry.
- What package options are available for the SN74LVC1T45DBVR?
The device is available in SOT-23 (DBV), SOT (DRL), SC70 (DCK), USON (DPK), and DSBGA (YZP) packages.
- What is the operating temperature range of the SN74LVC1T45DBVR?
The operating temperature range is -40°C to 85°C.
