Overview
The SN74AVC4T245DRE4 is a 4-bit, dual-supply noninverting bidirectional voltage level translation device produced by Texas Instruments. This device is designed for asynchronous communication between two data buses and supports universal low-voltage bidirectional translation between various voltage nodes (1.2V, 1.5V, 1.8V, 2.5V, and 3.3V). The SN74AVC4T245 operates with two separate configurable power-supply rails, VCCA and VCCB, each accepting any supply voltage from 1.2V to 3.6V. The device is optimized for high-speed data translation and features partial-power-down mode operation using Ioff circuitry to prevent backflow current.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | SOIC (D) | - |
| Pins | 16 | - |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage Range (VCCA/VCCB) | 1.2 to 3.6 | V |
| Input Voltage Range | -0.5 to 4.6 | V |
| Data Rate (1.8V to 3.3V translation) | 380 Mbps | - |
| ESD Protection (Human-Body Model) | 8000 V | - |
| ESD Protection (Machine Model) | 150 V | - |
| ESD Protection (Charged-Device Model) | 1000 V | - |
Key Features
- Fully configurable dual-rail design allowing each port to operate over the full 1.2V to 3.6V power-supply range.
- Control inputs VIH/VIL levels are referenced to VCCA voltage.
- I/Os are 4.6V tolerant.
- Ioff supports partial power-down mode operation to prevent backflow current.
- High-speed data translation with rates up to 380 Mbps (1.8V to 3.3V translation).
- Latch-up performance exceeds 100mA per JESD 78, Class II.
- ESD protection exceeds JESD 22 standards.
- VCC isolation feature ensures both ports are in high-impedance state if either VCC input is at GND.
Applications
The SN74AVC4T245 is suitable for various applications requiring voltage level translation between different voltage domains. These include:
- Low-voltage bidirectional translation in mixed-voltage systems.
- Asynchronous communication between two data buses.
- High-speed data translation in embedded systems, consumer electronics, and industrial control systems.
- Partial-power-down applications where power conservation is critical.
Q & A
- What is the primary function of the SN74AVC4T245?
The SN74AVC4T245 is a 4-bit, dual-supply noninverting bidirectional voltage level translation device designed for asynchronous communication between two data buses.
- What is the voltage range for VCCA and VCCB?
VCCA and VCCB can accept any supply voltage from 1.2V to 3.6V.
- What are the maximum data rates supported by the SN74AVC4T245?
The device supports data rates up to 380 Mbps for translation from 1.8V to 3.3V.
- How does the Ioff feature work in the SN74AVC4T245?
The Ioff circuitry disables the outputs to prevent damaging current backflow through the device when it is in partial-power-down mode.
- What is the purpose of the VCC isolation feature?
The VCC isolation feature ensures that both ports are in the high-impedance state if either VCC input is at GND.
- How do you ensure the high-impedance state during power up or power down?
Tie OE to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
- What are the ESD protection levels for the SN74AVC4T245?
The device exceeds JESD 22 standards with 8000V Human-Body Model, 150V Machine Model, and 1000V Charged-Device Model ESD protection.
- What is the operating temperature range of the SN74AVC4T245?
The operating temperature range is -40°C to 85°C.
- What are the typical applications of the SN74AVC4T245?
Typical applications include low-voltage bidirectional translation, asynchronous communication between data buses, high-speed data translation, and partial-power-down applications.
- What are the available package types for the SN74AVC4T245?
The device is available in SOIC, TVSOP, TSSOP, VQFN, and UQFN packages.
