Overview
The PCA9306DCTR, produced by Texas Instruments, is a dual bidirectional I2C and SMBus voltage-level translator. This device is designed to facilitate voltage-level translation between different voltage domains without the need for a direction pin. It operates with reference voltages VREF1 ranging from 1.2 V to 3.3 V and VREF2 ranging from 1.8 V to 5.5 V, allowing for seamless communication between devices operating at different voltage levels. The PCA9306DCTR is particularly useful in mixed-mode I2C applications and supports both standard-mode and fast-mode I2C devices.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | MSOP8 | - |
| Pins | 8 | - |
| Operating Temperature Range | -40 to 85 | °C |
| VREF1 (Reference Voltage 1) | 1.2 to 3.3 | V |
| VREF2 (Reference Voltage 2) | 1.8 to 5.5 | V |
| Enable Input Voltage (EN) | 0 to 5.5 | V |
| Propagation Delay | < 1.5 ns | - |
| ON-state Resistance (R_ON) | 3.5 Ω | - |
| ESD Protection | 2000-V Human-body model, 1000-V Charged-device model | - |
Key Features
- 2-bit bidirectional translator for SDA and SCL lines in mixed-mode I2C applications.
- I2C and SMBus compatible.
- Less than 1.5-ns maximum propagation delay to accommodate standard-mode and fast-mode I2C devices and multiple controllers.
- Bidirectional voltage translation without the use of a direction pin.
- Low 3.5-Ω ON-state resistance between input and output ports.
- Open-drain I2C I/O ports (SCL1, SDA1, SCL2, and SDA2).
- 5-V tolerant I2C I/O ports to support mixed-mode signal operation.
- High-impedance SCL1, SDA1, SCL2, and SDA2 pins for EN = low.
- Lockup-free operation for isolation when EN = 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.
Applications
- I2C, SMBus, PMBus, MDIO, UART, low-speed SDIO, GPIO, and other two-signal interfaces.
- Servers and routers (telecom switching equipment).
- Personal Computers.
- Industrial Automation.
- Isolation of buses operating at different frequencies (e.g., 400-kHz and 100-kHz buses).
Q & A
- What is the PCA9306DCTR used for?
The PCA9306DCTR is used as a dual bidirectional I2C and SMBus voltage-level translator, facilitating communication between devices operating at 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 PCA9306DCTR?
The maximum propagation delay is less than 1.5 ns.
- Does the PCA9306DCTR require a direction pin for voltage translation?
No, the PCA9306DCTR does not require a direction pin for voltage translation.
- What is the ON-state resistance of the PCA9306DCTR?
The ON-state resistance is 3.5 Ω.
- What kind of ESD protection does the PCA9306DCTR offer?
The PCA9306DCTR offers ESD protection exceeding JESD 22 – 2000-V Human-body model and 1000-V Charged-device model.
- What are the typical applications of the PCA9306DCTR?
Typical applications include I2C, SMBus, PMBus, MDIO, UART, low-speed SDIO, GPIO, servers, routers, personal computers, and industrial automation.
- How does the PCA9306DCTR handle different bus frequencies?
The PCA9306DCTR can isolate a 400-kHz bus from a 100-kHz bus by controlling the EN pin to disconnect the slower bus during fast-mode communication.
- What is the operating temperature range of the PCA9306DCTR?
The operating temperature range is -40°C to 85°C.
- What is the package type of the PCA9306DCTR?
The package type is MSOP8.
