Overview
The SN74AVCH4T245RGYR from Texas Instruments is a 4-bit, dual-supply, noninverting bidirectional voltage level translation device. This component is designed for asynchronous communication between two data buses, 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 device features two separate configurable power-supply rails, with the A port tracking VCCA and the B port tracking VCCB, both of which can operate over a range of 1.2V to 3.6V.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCCA/VCCB Supply Voltage | 1.2 | 3.6 | V | ||
| Operating Temperature | -40 | 85 | °C | ||
| Input Voltage (VI) | VCCI or GND | V | |||
| Output Current (IO) | Low-level output current | 8 | 12 | mA | |
| Input Transition Rise/Fall Rate | 5 | ns/V | |||
| Junction-to-Ambient Thermal Resistance (RθJA) | SOIC Package | 85.5 | °C/W | ||
| Junction-to-Case (Top) Thermal Resistance (RθJC) | SOIC Package | 46.9 | °C/W |
Key Features
- Fully configurable dual-rail design allowing each port to operate over the full 1.2V to 3.6V power-supply range.
- Supports high-speed translation with data rates up to 380Mbps for 1.8V to 3.3V translation.
- Ioff supports partial-power-down mode operation, preventing backflow current by disabling I/O output circuits.
- Active bus-hold circuitry holds unused or undriven inputs at a valid logic state.
- VCC isolation feature ensures both ports are in a high-impedance state if either VCCA or VCCB is at GND.
- ESD protection exceeds JESD 22 standards: 8000V Human-Body Model, 150V Machine Model, and 1000V Charged-Device Model.
Applications
The SN74AVCH4T245RGYR is suitable for various applications including personal electronics, industrial systems, enterprise equipment, and telecommunications. It is particularly useful in scenarios requiring voltage level translation between different voltage domains, such as in mixed-voltage systems and power management circuits.
Q & A
- What is the voltage range for VCCA and VCCB in the SN74AVCH4T245RGYR? The voltage range for both VCCA and VCCB is from 1.2V to 3.6V.
- What are the maximum data rates supported by the SN74AVCH4T245RGYR? The device supports data rates up to 380Mbps for 1.8V to 3.3V translation, and lower rates for other voltage translations.
- How does the Ioff feature work in the SN74AVCH4T245RGYR? The Ioff feature disables the outputs to prevent damaging current backflow through the device when it is powered down.
- What is the purpose of the bus-hold circuitry in the SN74AVCH4T245RGYR? The bus-hold circuitry holds unused or undriven inputs at a valid logic state.
- How does the VCC isolation feature work? If either VCCA or VCCB is at GND, both ports are placed in a high-impedance state.
- What kind of ESD protection does the SN74AVCH4T245RGYR offer? The device offers ESD protection exceeding JESD 22 standards: 8000V Human-Body Model, 150V Machine Model, and 1000V Charged-Device Model.
- What are the typical applications of the SN74AVCH4T245RGYR? It is used in personal electronics, industrial systems, enterprise equipment, and telecommunications.
- How do the direction-control (DIR) and output-enable (OE) inputs function? The DIR input controls the direction of data transmission, and the OE input enables or disables the outputs, placing them in a high-impedance state when set to high.
- What is the operating temperature range for the SN74AVCH4T245RGYR? The operating temperature range is from -40°C to 85°C.
- What are the available package options for the SN74AVCH4T245RGYR? The device is available in SOIC, TVSOP, TSSOP, UQFN, and VQFN packages.
