Overview
The SN74AVC4T245DT, produced by Texas Instruments, is a 4-bit noninverting bus transceiver designed for universal low-voltage bidirectional translation. This device uses two separate configurable power-supply rails, allowing each port to operate over the full 1.2V to 3.6V power-supply range. It is optimized for asynchronous communication between two data buses and supports partial-power-down applications using Ioff circuitry. The SN74AVC4T245DT is ideal for applications requiring voltage translation between different voltage nodes such as 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | SOIC, TVSOP, TSSOP, VQFN, UQFN | |
| Pins | 16 | |
| Operating Temperature Range | -40 to 85 | °C |
| VCCA/VCCB Voltage Range | 1.2V to 3.6V | |
| Maximum Data Rates | 380 Mbps (1.8V to 3.3V), 200 Mbps (< 1.8V to 3.3V), 150 Mbps (translate to 1.5V), 100 Mbps (translate to 1.2V) | Mbps |
| ESD Protection | 8000V Human-Body Model, 150V Machine Model, 1000V Charged-Device Model | |
| Latch-up Performance | Exceeds 100mA per JESD 78, Class II |
Key Features
- Control inputs VIH/VIL levels are referenced to VCCA voltage.
- Fully configurable dual-rail design allows each port to operate over the full 1.2V to 3.6V power-supply range.
- I/Os are 4.6V tolerant.
- Ioff supports partial power-down-mode operation.
- VCC isolation feature ensures both ports are in high-impedance state if either VCC input is at GND.
- ESD protection exceeds JESD 22 standards.
Applications
The SN74AVC4T245DT is suitable for various applications requiring voltage translation between different voltage nodes. These include:
- Telecommunication systems
- Consumer electronics
- Industrial control systems
- Automotive systems
- Any system requiring asynchronous communication between two data buses with different voltage levels.
Q & A
- What is the primary function of the SN74AVC4T245DT?
The primary function is to perform universal low-voltage bidirectional translation between two data buses with different voltage levels.
- What is the voltage range for VCCA and VCCB?
The voltage range for both VCCA and VCCB is from 1.2V to 3.6V.
- What are the maximum data rates supported by the SN74AVC4T245DT?
The device supports maximum data rates of 380 Mbps (1.8V to 3.3V), 200 Mbps (< 1.8V to 3.3V), 150 Mbps (translate to 1.5V), and 100 Mbps (translate to 1.2V).
- Does the SN74AVC4T245DT support partial power-down mode?
Yes, it supports partial power-down mode using Ioff circuitry.
- What is the ESD protection level of the SN74AVC4T245DT?
The device has ESD protection exceeding 8000V Human-Body Model, 150V Machine Model, and 1000V Charged-Device Model.
- How does the VCC isolation feature work?
If either VCC input is at GND, both ports are in the high-impedance state.
- What packages are available for the SN74AVC4T245DT?
The device is available in SOIC, TVSOP, TSSOP, VQFN, and UQFN packages.
- What is the operating temperature range of the SN74AVC4T245DT?
The operating temperature range is from -40°C to 85°C.
- Are the I/Os of the SN74AVC4T245DT voltage tolerant?
Yes, the I/Os are 4.6V tolerant.
- 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.
