Overview
The SN74AVC16T245ZQLR, produced by Texas Instruments, is a 16-bit dual-supply noninverting bidirectional voltage level translation bus transceiver. This device is designed to operate with two separate configurable power-supply rails, allowing for universal low-voltage bidirectional translation between various voltage nodes such as 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V. The A port tracks VCCA, and the B port tracks VCCB, both of which can accept supply voltages from 1.2V to 3.6V. The device features direction-control (DIR) and output-enable (OE) inputs, enabling flexible data transfer and output control.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCCA/VCCB) | 1.2 | - | 3.6 | V |
| Input Voltage (I/O ports) | -0.5 | - | 4.6 | V |
| Output Voltage (High or Low State) | -0.5 | - | VCCA + 0.5 / VCCB + 0.5 | V |
| Continuous Output Current | - | - | ±50 | mA |
| Operating Free-Air Temperature | -40 | - | 85 | °C |
| Propagation Delay (tPLH/tPHL) | 2.8 | - | 5.6 | ns |
| Input Transition Rise/Fall Rate | - | - | 5 | ns/V |
Key Features
- 16-bit dual-supply noninverting bidirectional voltage level translation.
- Operates with VCCA/VCCB from 1.2V to 3.6V.
- Supports universal low-voltage bidirectional translation between different voltage nodes.
- Direction-control (DIR) and output-enable (OE) inputs for flexible data transfer and output control.
- ESD protection exceeds JESD 22 standards (8000V Human-Body Model, 200V Machine Model, 1000V Charged-Device Model).
- Latch-Up performance exceeds 100mA per JESD 78, Class II.
- Partial-power-down applications supported using Ioff circuitry.
- VCC isolation feature ensures high-impedance state during power up or power down.
Applications
The SN74AVC16T245ZQLR is suitable for a variety of applications, including:
- Personal Electronics: For voltage translation in portable devices and consumer electronics.
- Industrial: In industrial control systems and automation where different voltage levels are used.
- Enterprise: In data centers and server systems requiring reliable voltage translation.
- Telecom: For use in telecommunications equipment where multiple voltage levels are present.
Q & A
- What is the primary function of the SN74AVC16T245ZQLR?
The primary function is to provide 16-bit dual-supply noninverting bidirectional voltage level translation between different voltage nodes.
- What are the acceptable supply voltage ranges for VCCA and VCCB?
VCCA and VCCB can accept supply voltages from 1.2V to 3.6V.
- What is the purpose of the DIR and OE inputs?
The DIR input controls the direction of data transfer, and the OE input can disable the outputs to isolate the buses.
- What are the ESD protection and latch-up performance specifications?
ESD protection exceeds JESD 22 standards, and latch-up performance exceeds 100mA per JESD 78, Class II.
- What is the operating temperature range of the device?
The operating free-air temperature range is from -40°C to 85°C.
- How does the device handle partial-power-down applications?
The device supports partial-power-down applications using Ioff circuitry, which disables the outputs to prevent damaging current backflow.
- What types of applications is the SN74AVC16T245ZQLR suitable for?
It is suitable for personal electronics, industrial, enterprise, and telecom applications.
- What are the typical propagation delays for the device?
Propagation delays (tPLH/tPHL) range from 2.8ns to 5.6ns depending on the supply voltages.
- How does the VCC isolation feature work?
The VCC isolation feature ensures that if either VCC input is at GND, both ports are in the high-impedance state.
- What is the recommended way to ensure high-impedance state during power up or power down?
OE should be tied to VCC through a pullup resistor to ensure the high-impedance state.
