Overview
The SN74LVC1T45DCKRG4, produced by Texas Instruments, is a single-bit, dual-supply, noninverting voltage level transceiver. This device is designed to facilitate asynchronous communication between two data buses operating at different voltage levels. The transceiver supports voltage levels ranging from 1.65V to 5.5V on both ports, making it versatile for various applications including logic level-shifting between different voltage nodes such as 1.8V, 2.5V, 3.3V, and 5V.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 1.65V to 5.5V | V |
| Output Voltage Range | 1.65V to 5.5V | V |
| ESD Protection | 2000V (Human-Body Model), 200V (Machine Model), 1000V (Charged-Device Model) | V |
| Package Types | SOT-23 (DBV), SC70 (DCK), USON (DPK), DSBGA (YZP) | - |
| Package Size (DCK) | 2mm × 2.1mm | mm |
| Junction-to-Ambient Thermal Resistance (DCK) | 210.9 °C/W | °C/W |
Key Features
- Fully configurable dual-rail design allowing each port to operate over the full 1.65V to 5.5V power-supply range.
- Supports asynchronous communication between two data buses.
- Direction control pin (DIR) determines the direction of data transmission (A to B or B to A).
- 3-State outputs.
- ESD protection exceeds JESD 22 standards (2000V Human-Body Model, 200V Machine Model, 1000V Charged-Device Model).
- Ioff circuitry disables the outputs to prevent damaging current backflow when the device is powered down.
- VCC isolation feature ensures both ports are in the high-impedance state if either VCC input is at GND.
- NanoFree™ package technology for compact and efficient packaging.
Applications
- Logic level-shifting between different voltage nodes (e.g., 1.8V, 2.5V, 3.3V, and 5V).
- Asynchronous communication between two data buses.
- Unidirectional logic level-shifting applications.
- Systems requiring voltage translation and isolation.
Q & A
- What is the input voltage range of the SN74LVC1T45?
The input voltage range is from 1.65V to 5.5V.
- What types of packages are available for the SN74LVC1T45?
The device is available in SOT-23 (DBV), SC70 (DCK), USON (DPK), and DSBGA (YZP) packages.
- How does the direction control pin (DIR) function?
The DIR pin determines the direction of data transmission; a high on DIR allows data transmission from A to B, and a low on DIR allows data transmission from B to A.
- What is the ESD protection level of the SN74LVC1T45?
The device has ESD protection exceeding JESD 22 standards: 2000V Human-Body Model, 200V Machine Model, and 1000V Charged-Device Model.
- What is the purpose of the Ioff circuitry in the SN74LVC1T45?
The Ioff circuitry disables the outputs to prevent damaging current backflow when the device is powered down.
- How does the VCC isolation feature work?
If either VCC input is at GND, the VCC isolation feature ensures both ports are in the high-impedance state.
- What is the significance of NanoFree™ package technology?
NanoFree™ package technology is a compact and efficient packaging method that uses the die as the package.
- What are some common applications of the SN74LVC1T45?
Common applications include logic level-shifting, asynchronous communication between two data buses, and systems requiring voltage translation and isolation.
- What is the junction-to-ambient thermal resistance for the SC70 package?
The junction-to-ambient thermal resistance for the SC70 package is 210.9 °C/W.
- Can the SN74LVC1T45 operate in partial-power-down applications?
Yes, the device is fully specified for partial-power-down applications using Ioff circuitry.
