Overview
The SN74AVCH16T245 is a 16-bit dual-supply noninverting bus transceiver designed for bidirectional voltage level translation. This device is part of Texas Instruments' family of voltage translators and is capable of operating over a wide range of supply voltages.
The device features two separate configurable power-supply rails, VCCA and VCCB, which can accept supply voltages from 1.65 V to 5.5 V. This flexibility allows for universal low-voltage translation between various voltage nodes such as 1.8 V, 2.5 V, 3.3 V, and 5 V.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| VCCA Supply voltage | -0.5 | 6.5 | V |
| VCCB Supply voltage | -0.5 | 6.5 | V |
| Input voltage (VI) | -0.5 | VCCA + 0.5 / VCCB + 0.5 | V |
| Output voltage (VO) | -0.5 | VCCA + 0.5 / VCCB + 0.5 | V |
| Operating free-air temperature (TA) | -40 | 85 | °C |
| Input clamp current (IIK) | -50 | mA | |
| Output clamp current (IOK) | -50 | mA | |
| Continuous output current (IO) | ±50 | mA |
Key Features
- Configurable Level-Shifting/Voltage Translation: Allows bidirectional translation between any of the 1.8-V, 2.5-V, 3.3-V, and 5-V voltage nodes.
- Dual-Rail Design: Each port can operate over the full 1.65 V to 5.5 V power-supply range.
- Tri-State Outputs: Outputs can be placed in a high-impedance state.
- Overvoltage-Tolerant Inputs and Outputs: Inputs and outputs can tolerate voltages beyond the supply rails.
- Bus Hold on Data Inputs: Eliminates the need for external pullup and pulldown resistors.
- Ioff Supports Partial-Power-Down Mode Operation: Reduces power consumption when not in use.
- Latch-Up Performance: Exceeds 100 mA per JESD 78, Class II.
Applications
The SN74AVCH16T245 is designed for asynchronous communication between two data buses operating at different voltage levels. It is particularly useful in mixed-voltage-mode data communications, such as in systems that integrate components with different supply voltages.
Common applications include:
- Mixed-voltage system design
- Data translation between different voltage domains
- Interface between low-voltage and high-voltage systems
- Power management and voltage translation in embedded systems
Q & A
- What is the voltage range for VCCA and VCCB in the SN74AVCH16T245?
VCCA and VCCB can accept supply voltages from 1.65 V to 5.5 V.
- How does the direction-control input (DIR) work?
A high on DIR allows data transmission from A to B, while a low on DIR allows data transmission from B to A when OE is set to low.
- What happens when the output-enable (OE) input is set to high?
When OE is set to high, both A and B ports are in the high-impedance state.
- Does the SN74AVCH16T245 support overvoltage-tolerant inputs and outputs?
- What is the purpose of the bus hold feature on data inputs?
The bus hold feature eliminates the need for external pullup and pulldown resistors.
- How does the Ioff feature support partial-power-down mode operation?
The Ioff feature reduces power consumption when the device is not in use.
- What is the latch-up performance of the SN74AVCH16T245?
The device exceeds 100 mA per JESD 78, Class II.
- What are common applications for the SN74AVCH16T245?
Common applications include mixed-voltage system design, data translation between different voltage domains, interface between low-voltage and high-voltage systems, and power management in embedded systems.
- What is the operating temperature range for the SN74AVCH16T245?
The operating temperature range is from -40°C to 85°C.
- How do I ensure proper device operation during power-up or power-down?
To ensure the high-impedance state during power-up or power-down, OE should be tied to VCC through a pullup resistor.
