Overview
The SN74LVC1T45DCKT, produced by Texas Instruments, is a single-bit, dual-supply, noninverting bus transceiver. 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 SN74LVC1T45 features two separate configurable power-supply rails, VCCA and VCCB, each accepting supply voltages from 1.65V to 5.5V. The direction-control (DIR) input determines the direction of data transmission between the A and B ports.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Voltage - VCCA | 1.65V to 5.5V | V |
| Voltage - VCCB | 1.65V to 5.5V | V |
| Input Signal | Logic HIGH or LOW | - |
| Output Signal | Tri-State, Non-Inverted | - |
| Data Rate | Up to 420 Mbps | Mbps |
| Operating Temperature | -40°C to 85°C | °C |
| Package Type | 6-TSSOP, SC-88, SOT-363 | - |
| Number of Pins | 6 | - |
| ESD Protection | 2000V Human-Body Model, 200V Machine Model, 1000V Charged-Device Model | V |
Key Features
- Fully configurable dual-rail design allowing each port to operate over the full 1.65V to 5.5V power-supply range.
- Supports universal low-voltage bidirectional translation between 1.8V, 2.5V, 3.3V, and 5V voltage nodes.
- The DIR input is powered by VCCA and determines the direction of data transmission.
- Ioff circuitry disables the outputs, preventing 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.
- Available in various packages including DRL (SOT), DBV (SOT-23), DCK (SC70), DPK (USON), and YZP (DSBGA).
- ESD protection exceeds JESD 22 standards (2000V Human-Body Model, 200V Machine Model, 1000V Charged-Device Model).
Applications
The SN74LVC1T45 is suitable for level-translation applications, enabling the interfacing of devices or systems operating at different interface voltages. It is particularly useful in scenarios where data needs to be transmitted between buses operating at different voltage levels, such as in mixed-voltage systems.
Example applications include:
- Unidirectional logic level-shifting applications.
- Bidirectional communication between different voltage domains in a system.
- Integration in mixed-voltage systems where compatibility between different voltage levels is required.
Q & A
- What is the primary function of the SN74LVC1T45?
The SN74LVC1T45 is a single-bit, dual-supply, noninverting bus transceiver designed for asynchronous communication between two data buses.
- What are the acceptable voltage ranges for VCCA and VCCB?
Both VCCA and VCCB can accept supply voltages from 1.65V to 5.5V.
- How does the DIR input control data transmission?
The DIR input determines the direction of data transmission; a high level on DIR allows data transmission from A to B, and a low level allows data transmission from B to A.
- What is the maximum data rate supported by the SN74LVC1T45?
The device can support data rates up to 420 Mbps, especially when translating signals from 3.3V to 5V.
- What are the available package types for the SN74LVC1T45?
The device is available in DRL (SOT), DBV (SOT-23), DCK (SC70), DPK (USON), and YZP (DSBGA) packages.
- What is the operating temperature range of the SN74LVC1T45?
The operating temperature range is from -40°C to 85°C.
- What kind of ESD protection does the SN74LVC1T45 offer?
The device offers ESD protection exceeding JESD 22 standards: 2000V Human-Body Model, 200V Machine Model, and 1000V Charged-Device Model.
- How does the Ioff circuitry function in the SN74LVC1T45?
The Ioff circuitry disables the outputs to prevent damaging current backflow when the device is powered down.
- What is the purpose of the VCC isolation feature?
The VCC isolation feature ensures that both ports are in the high-impedance state if either VCC input is at GND.
- In what types of systems is the SN74LVC1T45 typically used?
The device is typically used in mixed-voltage systems where level translation between different voltage domains is necessary.
