Overview
The SN74AVCH4T245, produced by Texas Instruments, is a 4-bit dual-supply bus transceiver designed for asynchronous communication between two data buses. This device supports configurable voltage translation and features 3-state outputs. It is optimized to operate with supply voltages ranging from 1.2 V to 3.6 V, making it versatile for various low-voltage applications. The SN74AVCH4T245 is particularly useful in scenarios where data needs to be translated between different voltage levels, such as in personal electronics, industrial, enterprise, and telecom systems.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCCA (Supply Voltage A Port) | 1.2 | 3.6 | V | |
| VCCB (Supply Voltage B Port) | 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 | |
| High-Level Output Current (IOH) | -3 | -6 | -12 | mA |
| Low-Level Output Current (IOL) | 3 | 6 | 12 | mA |
| Operating Free-Air Temperature (TA) | -40 | 85 | °C | |
| Switching Speed (tPLH, tPHL) | 2.6 | 3.4 | 5.3 | ns |
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 (DIR and OE) referenced to VCCA.
- I/Os are 4.6V tolerant.
- Bus hold on data inputs eliminates the need for external pull-up/pull-down resistors.
- Supports partial power-down-mode operation with Ioff circuitry.
- High-speed data transmission rates (e.g., 380 Mbps for 1.8 V to 3.3 V translation).
- ESD protection exceeds JESD 22 standards (8000 V Human Body Model, 200 V Machine Model, 1000 V Charged-Device Model).
- Latch-up performance exceeds 100 mA per JESD 78, Class II.
Applications
- Personal Electronics: Suitable for devices requiring voltage translation between different voltage domains.
- Industrial: Used in industrial control systems and automation where multiple voltage levels are present.
- Enterprise: Applied in server and networking equipment for reliable data communication.
- Telecom: Utilized in telecommunications equipment for efficient data transmission.
Q & A
- What is the SN74AVCH4T245 used for? The SN74AVCH4T245 is a 4-bit dual-supply bus transceiver used for asynchronous communication between two data buses with configurable voltage translation.
- What is the voltage range for VCCA and VCCB? Both VCCA and VCCB can operate within the range of 1.2 V to 3.6 V.
- What are the key features of the SN74AVCH4T245? Key features include fully configurable dual-rail design, 4.6V tolerant I/Os, bus hold on data inputs, and high-speed data transmission rates.
- What are the typical applications of the SN74AVCH4T245? Typical applications include personal electronics, industrial systems, enterprise equipment, and telecom devices.
- How does the SN74AVCH4T245 handle ESD protection? The device exceeds JESD 22 standards for ESD protection, including 8000 V Human Body Model, 200 V Machine Model, and 1000 V Charged-Device Model.
- What is the maximum data rate supported by the SN74AVCH4T245? The maximum data rate varies by voltage translation but can reach up to 380 Mbps for 1.8 V to 3.3 V translation.
- Does the SN74AVCH4T245 support partial power-down mode? Yes, it supports partial power-down mode with Ioff circuitry to prevent damaging current backflow.
- What are the thermal characteristics of the SN74AVCH4T245? The device has specified thermal metrics including junction-to-ambient thermal resistance and junction-to-case thermal resistance, depending on the package type.
- What packages are available for the SN74AVCH4T245? Available packages include UQFN, VQFN, TVSOP, TSSOP, and SOIC.
- How do the control inputs (DIR and OE) operate? The control inputs (DIR and OE) are referenced to VCCA and control the direction of data transmission and the output state.
