Overview
The SN74LVC1T45DCKTE4, 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, VCCA and VCCB, each accepting supply voltages from 1.65V to 5.5V. This flexibility makes it suitable for a wide range of applications requiring voltage level translation.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| VCCA and VCCB | Supply Voltage Range | 1.65V to 5.5V |
| ESD Protection | Human-Body Model | 2000V (A114-A) |
| ESD Protection | Machine Model | 200V (A115-A) |
| ESD Protection | Charged-Device Model | 1000V (C101) |
| Package Types | SOT-23, SC70, SOT, USON, DSBGA | Varying sizes (e.g., 2mm × 2.1mm for SC70) |
| Thermal Resistance (RθJA) | Junction-to-ambient thermal resistance | 210.9°C/W for SC70 package |
| Input Voltage Levels | High-level input voltage (VIH) | VCCA × 0.65 to VCCA × 0.7 depending on VCCA |
| Input Voltage Levels | Low-level input voltage (VIL) | VCCA × 0.35 to VCCA × 0.3 depending on VCCA |
Key Features
- Fully configurable dual-rail design allowing each port to operate over the full 1.65V to 5.5V power-supply range.
- Supports asynchronous communication between two data buses with direction control via the DIR input.
- ESD protection exceeding JESD 22 standards: 2000V Human-Body Model, 200V Machine Model, and 1000V Charged-Device Model.
- Available in various packages including SOT-23, SC70, SOT, USON, and DSBGA.
- Partial-power-down mode with Ioff circuitry to prevent backflow current when powered down.
- VCC isolation feature ensuring both ports are in high-impedance state if either VCC input is at GND.
- NanoFree™ package technology using the die as the package.
Applications
The SN74LVC1T45 is suitable for various applications requiring voltage level translation, such as:
- Telecom systems
- Enterprise systems
- Embedded systems needing asynchronous communication between different voltage domains.
- Industrial automation where different voltage levels are used.
- Consumer electronics requiring flexible voltage translation.
Q & A
- What is the primary function of the SN74LVC1T45?
The SN74LVC1T45 is a single-bit, dual-supply, noninverting bus transceiver designed for asynchronous communication between two data buses.
- What is the voltage range for VCCA and VCCB?
VCCA and VCCB can accept supply voltages from 1.65V to 5.5V.
- What types 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.
- How does the direction control (DIR) input work?
The DIR input determines the direction of data transmission between the A and B ports. A high level on DIR allows data transmission from A to B, while a low level allows data transmission from B to A.
- What is the purpose of the Ioff circuitry?
The Ioff circuitry disables the outputs when the device is powered down, preventing damaging current backflow.
- What is the VCC isolation feature?
The VCC isolation feature ensures that both ports are in a high-impedance state if either VCC input is at GND.
- What are the available package types for the SN74LVC1T45?
The device is available in SOT-23, SC70, SOT, USON, and DSBGA packages.
- What is the significance of NanoFree™ package technology?
NanoFree™ package technology uses the die as the package, which is a major breakthrough in IC packaging concepts.
- What are some typical applications for the SN74LVC1T45?
Typical applications include telecom systems, enterprise systems, embedded systems, industrial automation, and consumer electronics.
- How does the thermal resistance vary across different packages?
The thermal resistance (RθJA) varies across different packages, for example, 210.9°C/W for the SC70 package.
