Overview
The SN74LVC2T45YZPR, produced by Texas Instruments, is a dual-bit, dual-supply noninverting voltage level translation device. This component is designed to facilitate asynchronous communication between two data buses operating at different voltage levels. It supports a wide range of power-supply voltages from 1.65V to 5.5V for both the A and B ports, making it versatile for translating between various voltage nodes such as 1.8V, 2.5V, 3.3V, and 5V.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| VCCA Supply voltage | -0.5 | 6.5 | V |
| VCCB Supply voltage | -0.5 | 6.5 | V |
| VI Input voltage | -0.5 | 6.5 | V |
| VO Voltage range applied to any output in the high-impedance or power-off state | -0.5 | 6.5 | V |
| IO Continuous output current | -50 | 50 | mA |
| TJ Junction temperature | 150 | °C | |
| Tstg Storage temperature | -65 | 150 | °C |
| VIL Low-level input voltage (DIR referenced to VCCA) | VCCA × 0.35 | VCCA × 0.3 | V |
| VIH High-level input voltage (DIR referenced to VCCA) | VCCA × 0.65 | VCCA × 0.7 | V |
Key Features
- Fully Configurable Dual-Rail Design: Allows each port to operate over the full 1.65V to 5.5V power-supply range, enabling universal low-voltage bidirectional translation between various voltage nodes (1.8V, 2.5V, 3.3V, and 5V).
- High-Speed Translation: Supports high data rate applications, with translated signal data rates up to 420Mbps when translating from 3.3V to 5V.
- Ioff Supports Partial-Power-Down Mode Operation: Prevents backflow current by disabling I/O output circuits when the device is in Partial-Power-Down mode, ensuring inputs and outputs enter a high-impedance state when powered down.
- Balanced High-Drive CMOS Push-Pull Outputs: Allows the device to sink and source similar currents, enhancing output performance.
- VCC Isolation Feature: If either VCC input is at GND, both ports are in the high-impedance state, preventing damaging current backflow).
Applications
The SN74LVC2T45YZPR is suitable for various applications requiring voltage level translation between different voltage domains. These include:
- Telecommunications
- Enterprise systems
- Industrial automation
- Consumer electronics
- Any system requiring asynchronous communication between data buses operating at different voltage levels.
Q & A
- What is the voltage range supported by the SN74LVC2T45YZPR for both A and B ports?
The device supports a voltage range from 1.65V to 5.5V for both the A and B ports).
- How does the direction-control (DIR) input work?
The DIR input controls the direction of data transmission. A high on DIR allows data transmission from A to B, while a low on DIR allows data transmission from B to A).
- What is the maximum data rate supported by the SN74LVC2T45YZPR?
The device can support translated signal data rates up to 420Mbps when translating from 3.3V to 5V).
- How does the Ioff feature work in the SN74LVC2T45YZPR?
The Ioff feature prevents backflow current by disabling I/O output circuits when the device is in Partial-Power-Down mode, ensuring inputs and outputs enter a high-impedance state when powered down).
- What is the significance of the VCC isolation feature?
If either VCC input is at GND, both ports are in the high-impedance state, preventing damaging current backflow).
- What are the typical thermal metrics for the SN74LVC2T45YZPR?
The junction-to-ambient thermal resistance (RθJA) varies by package, e.g., 246.4°C/W for DCU, 195.3°C/W for DCT, and 105.8°C/W for YZP).
- What are the recommended operating conditions for the SN74LVC2T45YZPR?
The device operates over a temperature range of -40°C to +85°C, with supply voltages ranging from 1.65V to 5.5V for both VCCA and VCCB).
- What is the significance of balanced high-drive CMOS push-pull outputs?
This feature allows the device to sink and source similar currents, enhancing output performance).
- What are the typical propagation delays for the SN74LVC2T45YZPR?
Propagation delays vary based on the load capacitance and supply voltage, with detailed specifications provided in the datasheet).
- What are the package options available for the SN74LVC2T45YZPR?
The device is available in DCT (SM8, 8-pin), DCU (VSSOP, 8-pin), and YZP (DSBGA, 8-pin) packages).
