Overview
The PCA9306DCUR, produced by Texas Instruments, is a dual bidirectional I2C and SMBus voltage-level translator. This device is designed to facilitate voltage translation between two different voltage domains, operating from 1.2-V to 3.3-V (VREF1) and 1.8-V to 5.5-V (VREF2). It features an enable (EN) input that allows for the control of the translator switch, enabling or disabling the connection between the two voltage domains. This functionality is crucial in mixed-mode I2C applications where different voltage levels are involved.
The PCA9306DCUR is particularly useful in scenarios where it is necessary to isolate buses operating at different frequencies, such as a 400-kHz bus from a 100-kHz bus, by controlling the EN pin to disconnect the slower bus during fast-mode communication. The device also offers low ON-state resistance and minimal propagation delay, ensuring efficient data transfer between the connected ports.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| VREF1 Voltage Range | 1.2 - 3.3 | V |
| VREF2 Voltage Range | 1.8 - 5.5 | V |
| Propagation Delay | < 1.5 | ns |
| ON-State Resistance (RON) | Low | Ω |
| ESD Protection | 2000 V (Human-body model), 1000 V (Charged-device model) | V |
| Operating Temperature Range | -40 to 85 | °C |
| Package Types | SSOP (8), VSSOP (8), X2SON (8), DSBGA (8) | |
| Package Size (VSSOP) | 2.3 mm x 3.1 mm | mm |
Key Features
- Bidirectional voltage translation between 1.2 V and 5 V without a direction pin.
- Low ON-state resistance (RON) for minimal propagation delay.
- Enable (EN) input to control the translator switch.
- Lockup-free operation for isolation when EN is low.
- Flow-through pinout for ease of PCB trace routing.
- ESD protection exceeding JESD 22 standards.
- Support for standard-mode and fast-mode I2C and SMBus communication.
- Ability to isolate buses operating at different frequencies.
Applications
- Servers and routers (telecom switching equipment).
- Personal computers.
- Industrial automation.
- I2C, SMBus, PMBus, MDIO, UART, and low-speed SDIO interfaces.
- GPIO and other two-signal interfaces.
- Remote board insertion to backplane with I2C lines.
Q & A
- What is the primary function of the PCA9306DCUR?
The PCA9306DCUR is a dual bidirectional I2C and SMBus voltage-level translator, allowing voltage translation between two different voltage domains.
- What is the voltage range 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.
- How does the enable (EN) input function?
The EN input controls the translator switch; when high, the switch is ON, and when low, the switch is OFF, placing the ports in a high-impedance state.
- What is the maximum propagation delay of the PCA9306DCUR?
The propagation delay is less than 1.5 ns.
- What types of ESD protection does the PCA9306DCUR offer?
The device offers ESD protection exceeding 2000 V (Human-body model) and 1000 V (Charged-device model).
- What are the available package types for the PCA9306DCUR?
The device is available in SSOP (8), VSSOP (8), X2SON (8), and DSBGA (8) packages.
- Can the PCA9306DCUR isolate buses operating at different frequencies?
Yes, it can isolate a 400-kHz bus from a 100-kHz bus by controlling the EN pin.
- What is the operating temperature range of the PCA9306DCUR?
The operating temperature range is -40°C to 85°C.
- Is the PCA9306DCUR compatible with standard-mode and fast-mode I2C and SMBus?
Yes, it is compatible with both standard-mode and fast-mode I2C and SMBus communication.
- What are some common applications of the PCA9306DCUR?
Common applications include servers, routers, personal computers, industrial automation, and various two-signal interfaces.
