Overview
The SN74LVC1T45DBVTG4, produced by Texas Instruments, is a single-bit noninverting bus transceiver designed for asynchronous communication between two data buses. This device features two separate configurable power-supply rails, allowing each port to operate over a wide voltage range from 1.65V to 5.5V. This flexibility enables universal low-voltage bidirectional translation between various voltage nodes such as 1.8V, 2.5V, 3.3V, and 5V. The SN74LVC1T45 is particularly useful in systems requiring voltage-level shifting and 3-state outputs, making it a versatile component for a variety of electronic applications.
Key Specifications
| Specification | Value |
|---|---|
| Package Type | SOT-23 (DBV) |
| Operating Temperature Range | -40°C to +85°C |
| Power Supply Voltage Range (VCCA and VCCB) | 1.65V to 5.5V |
| Propagation Delay Time | 17.7 ns |
| Output Drive | ±24mA at 3.3V |
| Maximum Data Rates | 420Mbps (3.3V to 5V), 210Mbps (to 3.3V), 140Mbps (to 2.5V), 75Mbps (to 1.8V) |
| ESD Protection | 2000V Human-Body Model, 200V Machine Model, 1000V Charged-Device Model |
| Low Power Consumption | 4µA maximum ICC |
| Latch-up Performance | Exceeds 100mA per JESD 78, Class II |
Key Features
- Fully configurable dual-rail design allowing each port to operate over the full 1.65V to 5.5V 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, 4µA maximum ICC.
- ±24mA output drive at 3.3V.
- Ioff supports partial-power-down mode operation.
- ESD protection exceeds JESD 22 standards: 2000V Human-Body Model, 200V Machine Model, 1000V Charged-Device Model.
- Available in the Texas Instruments NanoFree™ package.
Applications
The SN74LVC1T45DBVTG4 is suitable for various applications requiring voltage-level shifting and bidirectional data transmission. These include:
- Asynchronous communication between two data buses in mixed-voltage systems.
- Voltage translation in systems with different voltage domains (e.g., 1.8V, 2.5V, 3.3V, 5V).
- Embedded systems, industrial control systems, and consumer electronics where power efficiency and ESD protection are crucial.
Q & A
- What is the primary function of the SN74LVC1T45DBVTG4?
The primary function is to act as a single-bit noninverting bus transceiver for asynchronous communication between two data buses with configurable voltage-level shifting.
- What is the voltage range for the power supply rails (VCCA and VCCB)?
The voltage range is from 1.65V to 5.5V for both VCCA and VCCB.
- What are the maximum data rates supported by the SN74LVC1T45DBVTG4?
The device supports maximum data rates of 420Mbps (3.3V to 5V), 210Mbps (to 3.3V), 140Mbps (to 2.5V), and 75Mbps (to 1.8V).
- What type of ESD protection does the SN74LVC1T45DBVTG4 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 propagation delay time of the SN74LVC1T45DBVTG4?
The propagation delay time is 17.7 ns.
- How does the DIR input circuit work?
The DIR input circuit is referenced to VCCA and controls the direction of data transmission between the A and B ports.
- What is the output drive capability of the SN74LVC1T45DBVTG4 at 3.3V?
The output drive capability is ±24mA at 3.3V.
- Does the SN74LVC1T45DBVTG4 support partial-power-down mode operation?
Yes, it supports partial-power-down mode operation through the Ioff feature.
- What is the operating temperature range of the SN74LVC1T45DBVTG4?
The operating temperature range is -40°C to +85°C.
- In what package is the SN74LVC1T45DBVTG4 available?
The device is available in the SOT-23 (DBV) package.
