Overview
The SN74LVC2T45DCUTE4, produced by Texas Instruments, is a dual-bit dual-supply bus transceiver designed for asynchronous communication between two data buses. This device features configurable voltage-level shifting and 3-state outputs, making it versatile for various voltage translation applications. It operates over a wide power-supply range from 1.65 V to 5.5 V for both VCCA and VCCB, allowing universal low-voltage bidirectional translation between different voltage nodes such as 1.8 V, 2.5 V, 3.3 V, and 5 V.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCCA and VCCB) | 1.65 to 5.5 | V |
| Low Level Output Current | 32 | mA |
| Output Type | 3-State | |
| Maximum ICC (Power Consumption) | 4 | µA |
| Output Drive at 3.3 V | ±24 | mA |
| Data Rates | 420 Mbps (3.3 V to 5 V), 210 Mbps (to 3.3 V), 140 Mbps (to 2.5 V), 75 Mbps (to 1.8 V) | Mbps |
| ESD Protection | 4000 V (Human-Body Model), 200 V (Machine Model), 1000 V (Charged-Device Model) | V |
| Latch-Up Performance | Exceeds 100 mA per JESD 78, Class II | mA |
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 for various voltage translations.
- Robust ESD protection and latch-up performance.
Applications
The SN74LVC2T45DCUTE4 is ideal for applications requiring asynchronous communication and voltage translation between different voltage domains. This includes:
- Low-voltage bidirectional translation in mixed-voltage systems.
- Interface between different voltage nodes in embedded systems, such as microcontrollers and peripherals.
- Power management and partial-power-down applications.
- High-speed data transmission in communication systems.
Q & A
- What is the operating voltage range for the SN74LVC2T45DCUTE4?
The device operates over a voltage range from 1.65 V to 5.5 V for both VCCA and VCCB.
- What is the maximum output drive current at 3.3 V?
The maximum output drive current at 3.3 V is ±24 mA.
- What are the data rates supported by the SN74LVC2T45DCUTE4?
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 SN74LVC2T45DCUTE4 support partial-power-down mode?
- What is the ESD protection level of the SN74LVC2T45DCUTE4?
The device has ESD protection exceeding 4000 V (Human-Body Model), 200 V (Machine Model), and 1000 V (Charged-Device Model).
- What package options are available for the SN74LVC2T45DCUTE4?
The device is available in the Texas Instruments NanoFree™ package.
- How does the VCC isolation feature work?
If either VCC input is at GND, both ports are in the high-impedance state.
- What is the significance of the DIR input circuit being referenced to VCCA?
The DIR input circuit being referenced to VCCA ensures proper direction control based on the voltage level of VCCA.
- What are the typical propagation delays for the SN74LVC2T45DCUTE4?
The propagation delays vary based on load capacitance and supply voltage, but detailed values can be found in the datasheet.
- How does the device handle bus contention during direction changes?
The system designer should take precautions to avoid bus contention between systems when changing directions, as the device does not have an output-enable (OE) pin.
