Overview
The SN74AVC4T245PWRE4, produced by Texas Instruments, is a 4-bit dual-supply bus transceiver designed for bidirectional voltage-level translation. This device is optimized for asynchronous communication between two data buses, allowing it to operate with supply voltages ranging from 1.2V to 3.6V on both ports. It features a fully configurable dual-rail design, enabling universal low-voltage translation between various voltage nodes such as 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V. The device is particularly useful in systems where different voltage levels need to be translated efficiently and reliably.
Key Specifications
| Parameter | Description |
|---|---|
| Package | TSSOP (PW), SOIC, TVSOP, VQFN, UQFN |
| Pins | 16 |
| Operating Temperature Range (°C) | -40 to 85 |
| Supply Voltage Range (V) | 1.2V to 3.6V (both VCCA and VCCB) |
| Data Rates | 380Mbps (1.8V to 3.3V translation), 200Mbps (< 1.8V to 3.3V translation), 200Mbps (translate to 2.5V or 1.8V), 150Mbps (translate to 1.5V), 100Mbps (translate to 1.2V) |
| ESD Protection | 8000V Human-Body Model, 150V Machine Model, 1000V Charged-Device Model |
| Latch-up Performance | Exceeds 100mA per JESD 78, Class II |
| I/O Tolerance | 4.6V tolerant |
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.
- High-speed data rates with various voltage translations.
- ESD protection exceeds JESD 22 standards.
- Latch-up performance exceeds 100mA per JESD 78, Class II.
- VCC isolation feature ensures both ports are in high-impedance state if either VCC input is at GND.
Applications
The SN74AVC4T245PWRE4 is suitable for a wide range of applications where bidirectional voltage-level translation is necessary. These include:
- Mobile and consumer electronics requiring voltage translation between different voltage domains.
- Industrial control systems where different voltage levels are used for various components.
- Automotive systems that need reliable and efficient voltage translation.
- Embedded systems and IoT devices that require low-voltage operation and efficient data transfer.
Q & A
- What is the primary function of the SN74AVC4T245PWRE4?
The primary function is to perform bidirectional voltage-level translation between two data buses with different supply voltages.
- What is the range of supply voltages supported by the SN74AVC4T245PWRE4?
The device supports supply voltages ranging from 1.2V to 3.6V on both VCCA and VCCB.
- What are the maximum data rates supported by the SN74AVC4T245PWRE4?
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 device handle ESD protection?
The device exceeds JESD 22 standards with 8000V Human-Body Model, 150V Machine Model, and 1000V Charged-Device Model protection.
- What is the purpose of the Ioff feature in the SN74AVC4T245PWRE4?
The Ioff feature supports partial power-down-mode operation by disabling the outputs to prevent damaging current backflow when the device is powered down.
- How do the direction-control (DIR) and output-enable (OE) inputs function?
The DIR input determines the direction of data transmission, while the OE input can place both output ports into the high-impedance state when set to high.
- What is the significance of VCC isolation in the SN74AVC4T245PWRE4?
If either VCC input is at GND, both ports are placed in the high-impedance state to prevent unwanted current flow.
- What are the package options available for the SN74AVC4T245PWRE4?
The device is available in TSSOP, SOIC, TVSOP, VQFN, and UQFN packages.
- What is the operating temperature range of the SN74AVC4T245PWRE4?
The device operates within a temperature range of -40°C to 85°C.
- How does the device ensure high-impedance state during power up or power down?
The device can be put in the high-impedance state by tying OE to VCC through a pullup resistor.
