Overview
The SN74LVC1T45DBVRE4, produced by Texas Instruments, is a single-bit, dual-supply, noninverting voltage level transceiver. This device is designed for asynchronous communication between two data buses and supports a wide range of voltage levels. The A port and the direction control pin (DIR) are supported by VCCA, while the B port is supported by VCCB. Both VCCA and VCCB can be supplied at any voltage between 1.65V and 5.5V, making the device versatile for translating between various voltage nodes such as 1.8V, 2.5V, 3.3V, and 5V.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Free-Air Temperature | -40 | 85 | °C | |
| VCCA and VCCB Voltage Range | 1.65 | 5.5 | V | |
| Input Voltage Range (A and B ports) | 1.65 | 5.5 | V | |
| Output High Voltage (VOH) at IOH = -100μA | VCC - 0.1 | V | ||
| Output Low Voltage (VOL) at IOL = 100μA | 0.1 | V | ||
| High-Level Output Current (IOH) at 3.3V | -24 | mA | ||
| Low-Level Output Current (IOL) at 3.3V | 24 | mA | ||
| Maximum Data Rate (3.3V to 5V translation) | 420 | Mbps | ||
| Package Types | SOT-23 (DBV), SC70 (DCK), USON (DPK), SOT (DRL), DSBGA (YZP) |
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, 4µA maximum ICC.
- ±24mA output drive at 3.3V.
- Ioff supports partial-power-down mode operation.
- ESD protection exceeds JESD 22: 2000V Human-Body Model, 200V Machine Model, 1000V Charged-Device Model.
- Available in the Texas Instruments NanoFree™ package.
Applications
The SN74LVC1T45DBVRE4 is suitable for various applications, including:
- Level-translation applications for interfacing devices or systems operating at different interface voltages.
- Unidirectional logic level-shifting applications, allowing data transmission between different voltage domains.
- Asynchronous communication between two data buses, enabling flexible and reliable data transfer.
Q & A
- What is the operating voltage range for VCCA and VCCB in the SN74LVC1T45DBVRE4?
The operating voltage range for both VCCA and VCCB is from 1.65V to 5.5V.
- What is the maximum data rate for the SN74LVC1T45DBVRE4 when translating signals from 3.3V to 5V?
The maximum data rate is up to 420 Mbps when translating signals from 3.3V to 5V.
- What types of packages are available for the SN74LVC1T45DBVRE4?
The device is available in SOT-23 (DBV), SC70 (DCK), USON (DPK), SOT (DRL), and DSBGA (YZP) packages.
- What is the purpose of the DIR input in the SN74LVC1T45DBVRE4?
The DIR input determines the direction of data transmission between the A and B ports. A high on the DIR allows data transmission from A to B, and a low on the DIR allows data transmission from B to A).
- Does the SN74LVC1T45DBVRE4 have ESD protection?
Yes, the device has ESD protection that exceeds JESD 22 standards: 2000V Human-Body Model, 200V Machine Model, and 1000V Charged-Device Model).
- What is the power consumption of the SN74LVC1T45DBVRE4?
The device has a low power consumption with a maximum ICC of 4µA).
- Can the SN74LVC1T45DBVRE4 operate in partial-power-down mode?
Yes, the device supports partial-power-down mode operation through the Ioff feature).
- What is the output drive capability of the SN74LVC1T45DBVRE4 at 3.3V?
The device can drive up to ±24mA at 3.3V).
- What are the thermal metrics for the SN74LVC1T45DBVRE4?
The thermal metrics include junction-to-ambient thermal resistance (RθJA), junction-to-case thermal resistance (RθJC), and junction-to-board thermal resistance (RθJB), which vary depending on the package type).
- How does the VCC isolation feature work in the SN74LVC1T45DBVRE4?
If either VCC input is at GND, both ports of the device are in the high-impedance state).
