Overview
The PCA9306DCTTE4, 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 domains without the need for a direction pin. It operates with an enable (EN) input and supports voltage supply ranges from 1.2 V to 3.3 V for VREF1 and from 1.8 V to 5.5 V for VREF2. The PCA9306 is particularly useful in mixed-mode I2C applications, allowing seamless communication between devices operating at different voltage levels.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| Input/Output Voltage (SCL1, SDA1, SCL2, SDA2) | 0 | 5.5 | V |
| Reference Voltage (VREF1) | 1.2 | 3.3 | V |
| Reference Voltage (VREF2) | 1.8 | 5.5 | V |
| Enable Input Voltage (EN) | 0 | 5.5 | V |
| Operating Ambient Temperature (TA) | -40 | 85 | °C |
| Pass Switch Current (IPASS) | 64 | mA | |
| Junction-to-Ambient Thermal Resistance (RθJA) | 189.6 | °C/W |
Key Features
- 2-bit bidirectional translator for SDA and SCL lines in mixed-mode I2C applications.
- I2C and SMBus compatible.
- Lockup-free operation for isolation when EN is low.
- Flow-through pinout for ease of printed-circuit-board trace routing.
- Latch-up performance exceeds 100 mA per JESD 78, class II.
- ESD protection exceeds JESD 22 – 2000-V Human-body model and 1000-V Charged-device model.
- Low ON-state resistance (RON) for minimal propagation delay.
- Ability to isolate a 400-kHz bus from a 100-kHz bus using the EN pin.
Applications
- Servers.
- Routers (telecom switching equipment).
- Personal Computers.
- Industrial Automation.
- I2C, SMBus, PMBus, MDIO, UART, low-speed SDIO, GPIO, and other two-signal interfaces.
Q & A
- What is the PCA9306DCTTE4 used for? The PCA9306DCTTE4 is a dual bidirectional I2C and SMBus voltage-level translator used to facilitate communication between devices operating at different voltage levels.
- What are the supported voltage ranges for VREF1 and VREF2? VREF1 supports 1.2 V to 3.3 V, and VREF2 supports 1.8 V to 5.5 V.
- What is the maximum operating frequency of the PCA9306? The device supports operating frequencies up to 400 kHz.
- How does the EN pin function? The EN pin controls the translator switch; when high, it connects the SCL1 and SDA1 I/O to the SCL2 and SDA2 I/O, and when low, it isolates the ports.
- What kind of ESD protection does the PCA9306 offer? The PCA9306 offers ESD protection exceeding JESD 22 – 2000-V Human-body model and 1000-V Charged-device model.
- What are the typical applications of the PCA9306? Typical applications include servers, routers, personal computers, and industrial automation.
- What is the thermal resistance of the PCA9306? The junction-to-ambient thermal resistance (RθJA) is approximately 189.6 °C/W.
- Does the PCA9306 support different bus frequencies? Yes, it can support two buses operating at different frequencies (e.g., 400 kHz and 100 kHz) by using the EN pin to isolate the slower bus during fast-mode communication.
- What is the package type of the PCA9306DCTTE4? The PCA9306DCTTE4 is available in an 8-pin SSOP package.
- Is the PCA9306 latch-up free? Yes, the PCA9306 device has latch-up performance that exceeds 100 mA per JESD 78, class II.
