Overview
The PCA9306DCURG4, produced by Texas Instruments, is a dual bidirectional I2C and SMBus voltage-level translator. This device is designed to facilitate bidirectional voltage translations between two different voltage levels, ranging from 1.2 V to 5.5 V, without the need for a direction pin. It features an enable (EN) input that allows the translator switch to be turned on or off, enabling or disabling the connection between the two I2C/SMBus ports. This functionality is particularly useful in mixed-mode I2C applications where different voltage levels are involved.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Voltage Supply Range (VREF1) | Operating voltage range for VREF1 | 1.2 V to 3.3 V |
| Voltage Supply Range (VREF2) | Operating voltage range for VREF2 | 1.8 V to 5.5 V |
| Propagation Delay | Maximum propagation delay | Less than 1.5 ns |
| ESD Protection | Human-body model and charged-device model ESD protection | 2000 V (HBM), 1000 V (CDM) |
| Operating Frequency | Supported I2C/SMBus operating frequencies | Up to 400 kHz |
| Package Options | Available package types | SSOP (8), VSSOP (8), X2SON (8), DSBGA (8) |
| Package Size (DCURG4) | Size of the DSBGA package | 1.98 mm x 0.98 mm |
Key Features
- Bidirectional voltage translation between 1.2 V and 5 V without a direction pin.
- I2C and SMBus compatibility.
- Enable (EN) input to control the translator switch.
- Lockup-free operation when EN is low.
- Flow-through pinout for ease of PCB trace routing.
- High ESD protection (2000 V HBM, 1000 V CDM).
- Low ON-state resistance (RON) for minimal propagation delay.
- Support for isolating buses operating at different frequencies (e.g., 400 kHz and 100 kHz).
Applications
- I2C, SMBus, PMBus, MDIO, UART, low-speed SDIO, GPIO, and other two-signal interfaces.
- Servers and telecom switching equipment.
- Personal computers.
- Industrial automation.
- Remote board insertion to backplane applications to prevent data corruption and unintended pulses.
Q & A
- What is the PCA9306DCURG4 used for?
The PCA9306DCURG4 is a dual bidirectional I2C and SMBus voltage-level translator used for bidirectional voltage translations between different voltage levels.
- What are the operating voltage ranges for VREF1 and VREF2?
VREF1 operates from 1.2 V to 3.3 V, and VREF2 operates from 1.8 V to 5.5 V.
- What is the maximum propagation delay of the PCA9306?
The maximum propagation delay is less than 1.5 ns.
- What types of ESD protection does the PCA9306 offer?
The PCA9306 offers 2000 V Human-body model (HBM) and 1000 V Charged-device model (CDM) ESD protection.
- What are the supported I2C/SMBus operating frequencies?
The device supports operating frequencies up to 400 kHz.
- What package options are available for the PCA9306?
The PCA9306 is available in SSOP (8), VSSOP (8), X2SON (8), and DSBGA (8) packages.
- How does the enable (EN) input function?
The EN input controls the translator switch, allowing it to be turned on or off to enable or disable the connection between the two I2C/SMBus ports.
- Can the PCA9306 isolate buses operating at different frequencies?
Yes, the PCA9306 can isolate a 400-kHz bus from a 100-kHz bus by controlling the EN pin.
- What is the purpose of the flow-through pinout?
The flow-through pinout is designed for ease of printed-circuit-board trace routing.
- How does the PCA9306 support remote board insertion to backplane applications?
The PCA9306 can be disabled while making the connection to prevent data corruption and unintended pulses on the SCL line.
