Overview
The SN74LVC2T45DCUR is a 2-bit dual-supply bus transceiver produced by Texas Instruments. This device is designed for asynchronous communication between two data buses, enabling universal low-voltage bidirectional translation between various voltage nodes such as 1.8V, 2.5V, 3.3V, and 5V. The transceiver features two separate configurable power-supply rails, with the A port tracking VCCA and the B port tracking VCCB, each accepting supply voltages from 1.65V to 5.5V.
The device is particularly useful in systems where voltage-level shifting is necessary, and it supports partial-power-down mode operation through its Ioff circuitry. The SN74LVC2T45DCUR is available in a VSSOP (DCU) package with 8 pins and operates over a temperature range of -40°C to 85°C.
Key Specifications
| Parameter | Value |
|---|---|
| Package | VSSOP (DCU) |
| Pins | 8 |
| Operating Temperature Range (°C) | -40 to 85 |
| Supply Voltage Range (V) | 1.65 to 5.5 |
| Maximum ICC (µA) | 4 |
| Output Drive at 3.3 V (mA) | ±24 |
| Data Rates (Mbps) | 420 (3.3-V to 5-V), 210 (to 3.3 V), 140 (to 2.5 V), 75 (to 1.8 V) |
| Latch-Up Performance (mA) | Exceeds 100 mA per JESD 78, Class II |
| ESD Protection (V) | 4000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model |
Key Features
- Fully configurable dual-rail design allowing each port to operate over the full 1.65-V to 5.5-V 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 4 µA.
- Available in the Texas Instruments NanoFree™ package.
- ±24-mA output drive at 3.3 V.
- Ioff supports Partial-Power-Down mode operation.
- High data rates: 420 Mbps (3.3-V to 5-V translation), 210 Mbps (translate to 3.3 V), 140 Mbps (translate to 2.5 V), and 75 Mbps (translate to 1.8 V).
- Latch-up performance exceeds 100 mA per JESD 78, Class II.
- ESD protection exceeds JESD 22 standards.
Applications
The SN74LVC2T45DCUR is suitable for a variety of applications requiring voltage-level shifting and bidirectional data transmission. These include:
- Asynchronous communication between two data buses in mixed-voltage systems.
- Universal low-voltage translation between different voltage nodes (1.8V, 2.5V, 3.3V, and 5V).
- Partial-power-down mode applications where Ioff circuitry is necessary to prevent current backflow.
- Systems requiring high data rates and low power consumption.
- Industrial and consumer electronics where robust ESD protection is essential.
Q & A
- What is the primary function of the SN74LVC2T45DCUR?
The SN74LVC2T45DCUR is a 2-bit dual-supply bus transceiver designed for asynchronous communication between two data buses, enabling bidirectional voltage-level shifting.
- What is the operating temperature range of the SN74LVC2T45DCUR?
The device operates over a temperature range of -40°C to 85°C.
- What are the supported supply voltage ranges for the A and B ports?
Both the A and B ports can operate over a supply voltage range of 1.65V to 5.5V.
- What is the maximum ICC of the SN74LVC2T45DCUR?
The maximum ICC is 4 µA.
- What are the data rates supported by the SN74LVC2T45DCUR?
The device supports data rates of 420 Mbps (3.3-V to 5-V), 210 Mbps (to 3.3 V), 140 Mbps (to 2.5 V), and 75 Mbps (to 1.8 V).
- Does the SN74LVC2T45DCUR support partial-power-down mode?
Yes, the device supports partial-power-down mode operation using Ioff circuitry.
- What is the output drive capability of the SN74LVC2T45DCUR at 3.3 V?
The output drive capability is ±24 mA at 3.3 V.
- What kind of ESD protection does the SN74LVC2T45DCUR offer?
The device offers ESD protection exceeding JESD 22 standards, including 4000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- In what package is the SN74LVC2T45DCUR available?
The device is available in a VSSOP (DCU) package with 8 pins.
- What is the VCC isolation feature of the SN74LVC2T45DCUR?
If either VCC input is at GND, both ports are in the high-impedance state.
