Overview
The SN74LVC1T45DBVT, produced by Texas Instruments, is a single-bit, dual-supply, noninverting bus transceiver. This device is designed for asynchronous communication between two data buses, allowing for universal low-voltage bidirectional translation between various voltage nodes such as 1.8V, 2.5V, 3.3V, and 5V. The SN74LVC1T45 features two separate configurable power-supply rails, with the A port tracking VCCA and the B port tracking VCCB, both of which can operate within a range of 1.65V to 5.5V.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| Supply Voltage (VCCA, VCCB) | 1.65 | 5.5 | V |
| High-Level Input Voltage (VIH) | VCCI × 0.65 (1.65-1.95V) | VCCI × 0.7 (2.3-2.7V, 3-3.6V, 4.5-5.5V) | V |
| Low-Level Input Voltage (VIL) | VCCI × 0.35 (1.65-1.95V) | VCCI × 0.3 (2.3-2.7V, 3-3.6V, 4.5-5.5V) | V |
| High-Level Output Current (IOH) | -4 (1.65-1.95V) | -32 (4.5-5.5V) | mA |
| Low-Level Output Current (IOL) | 20 (1.65-1.95V) | 32 (4.5-5.5V) | mA |
| Data Rate | 75 Mbps (1.8V) | 420 Mbps (3.3V to 5V) | Mbps |
| Package Type | DBVT (SOT-23, 6) | ||
| Package Size | 2.9mm × 2.8mm |
Key Features
- Fully configurable dual-rail design allowing each port to operate over the full 1.65V to 5.5V power-supply range.
- Supports high-speed translation with data rates up to 420 Mbps when translating signals from 3.3V to 5V.
- Ioff supports partial power-down mode operation, disabling outputs to prevent current backflow.
- Glitch-free power supply sequencing, allowing either supply rail to be powered on or off in any order without producing glitches.
- ESD protection exceeds JESD 22 standards: 2000V Human-Body Model, 200V Machine Model, and 1000V Charged-Device Model.
- Low power consumption with a maximum ICC of 4 μA.
- ±24 mA output drive at 3.3 V.
- Balanced high-drive CMOS push-pull outputs.
Applications
- Level-translation applications for interfacing devices or systems operating at different interface voltages.
- Unidirectional and bidirectional logic level-shifting applications.
- Personal electronic devices.
- Industrial applications.
- Enterprise and telecom systems.
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.
- What are the maximum data rates supported by the SN74LVC1T45? The device supports data rates up to 420 Mbps when translating signals from 3.3V to 5V, and lower rates for other voltage translations.
- How does the DIR input control data transmission? The DIR input controls the direction of data transmission; a high level allows data transmission from A to B, and a low level allows data transmission from B to A.
- What is the significance of Ioff in the SN74LVC1T45? Ioff supports partial power-down mode operation by disabling the outputs and preventing current backflow when the device is powered down.
- 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.
- What is the package type and size for the SN74LVC1T45DBVT? The package type is DBVT (SOT-23, 6) with a size of 2.9mm × 2.8mm.
- Can the SN74LVC1T45 be used in safety-critical applications? Users are responsible for determining the suitability of the component for their purposes and validating the design implementation to confirm system functionality.
- How does the device handle power supply sequencing? The device is designed for glitch-free power supply sequencing, allowing either supply rail to be powered on or off in any order without producing glitches.
- What are the thermal metrics for the SN74LVC1T45? The device has specified thermal metrics including junction-to-ambient thermal resistance, junction-to-case thermal resistance, and junction-to-board thermal resistance, which vary depending on the package type.
- What are some common layout guidelines for using the SN74LVC1T45? Recommended guidelines include using bypass capacitors on power supplies, keeping trace lengths short, and placing pads for loading capacitors or pull-up resistors as needed.
