Overview
The SN74LXC1T45DBVR, produced by Texas Instruments, is a single-bit, dual-supply, noninverting voltage level 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 A port and the direction control pin (DIR) are referenced to VCCA, while the B port is referenced to VCCB. Both VCCA and VCCB can be supplied at any voltage between 1.65V and 5.5V, making the device highly versatile for different voltage environments.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCCA, VCCB) | 1.65 to 5.5 | V |
| Input Voltage (VI) | -0.5 to 6.5 | V |
| Output Voltage (VO) | -0.5 to VCCA + 0.5 (A port), -0.5 to VCCB + 0.5 (B port) | V |
| Input Clamp Current (IIK) | -50 | mA |
| Output Clamp Current (IOK) | -50 | mA |
| Continuous Output Current (IO) | ±50 | mA |
| Continuous Current through VCC or GND | ±100 | mA |
| Junction Temperature (TJ) | 150 | °C |
| Storage Temperature (Tstg) | -65 to 150 | °C |
| Operating Free-Air Temperature | -40 to 125 | °C |
| Maximum Data Rates | 420 Mbps (3.3V to 5V), 210 Mbps (translate to 3.3V), 140 Mbps (translate to 2.5V), 75 Mbps (translate to 1.8V) | Mbps |
| Package Type | SOT-23 (6 pins) | |
| Body Size (Nominal) | 2.90 mm × 1.60 mm | mm |
Key Features
- Fully configurable dual-rail design allowing each port to operate over the full 1.65V to 5.5V power-supply range.
- ESD protection exceeds JESD 22: 2000V Human-Body Model, 200V Machine Model, and 1000V Charged-Device Model.
- 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, 4µA maximum ICC.[
- ±24mA output drive at 3.3V.[
- Ioff supports partial-power-down mode operation.[
- Latch-up performance exceeds 100mA per JESD 78, Class II.[
- Available in the Texas Instruments NanoFree™ package.[
Applications
- General purpose I/O level shifting between different voltage nodes (1.8V, 2.5V, 3.3V, and 5V).
- Eliminate slow or noisy input signals.
- Driving indicator LEDs or buzzers.
- Debouncing a mechanical switch.[
- Automotive applications (qualified for AEC-Q100).[
Q & A
- What is the voltage range for the supply voltages VCCA and VCCB?
The supply voltages VCCA and VCCB can range from 1.65V to 5.5V.
- How does the direction control pin (DIR) function?
A high on the DIR allows data transmission from A to B, and a low on the DIR allows data transmission from B to A.
- What are the maximum data rates supported by the SN74LXC1T45?
The device supports maximum data rates of 420 Mbps (3.3V to 5V), 210 Mbps (translate to 3.3V), 140 Mbps (translate to 2.5V), and 75 Mbps (translate to 1.8V).[
- What is the ESD protection level of the SN74LXC1T45?
The ESD protection exceeds JESD 22: 2000V Human-Body Model, 200V Machine Model, and 1000V Charged-Device Model.[
- What is the operating free-air temperature range for the SN74LXC1T45?
The operating free-air temperature range is -40°C to 125°C.[
- What package types are available for the SN74LXC1T45?
The device is available in several package types including SOT-23, SC70, SOT, USON, and DSBGA.[
- What is the purpose of the VCC isolation feature?
If either VCC input is at GND, both ports are in the high-impedance state.[
- How much output drive can the SN74LXC1T45 provide at 3.3V?
The device can provide ±24mA output drive at 3.3V.[
- Is the SN74LXC1T45 suitable for automotive applications?
Yes, it is qualified for automotive applications and meets AEC-Q100 standards.[
- What is the maximum junction temperature for the SN74LXC1T45?
The maximum junction temperature is 150°C.[
