Hot-selling and scarce PCA9306DC Dual bidirectional I2C-bus and SMBus voltage-level translator VSSOP8 spot stock

Product Descriptions

The PCA9306 is a dual bidirectional I2C-bus and SMBus voltage-level translator with an enable (EN) input, and is operational from 1.1 V to 3.6 V (Vref(1)) and 2.3 V to 5.5 V (Vbias(ref)(2)).

The PCA9306 allows bidirectional voltage translations between 1.2 V and 5 V without the use of a direction pin. The low ON-state resistance (Ron) of the switch allows connections to be made with minimal propagation delay. When EN is HIGH, the translator switch is on, and the SCL1 and SDA1 I/O are connected to the SCL2 and SDA2 I/O, respectively, allowing bidirectional data flow between ports. When EN is LOW, the translator switch is off, and a high-impedance state exists between ports.

In I2C-bus applications, the bus capacitance limit of 400 pF restricts the number of devices and bus length. Using the PCA9306 enables the system designer to isolate two halves of a bus, thus more I2C-bus devices or longer trace length can be accommodated by using the enable pin. The PCA9306 is not a bus buffer like the PCA9509 or PCA9517 that provides level translation and physically isolates the capacitance to either side of the bus even when both sides are connected.

The PCA9306 can also be used to run two buses, one at 400 kHz operating frequency and the other at 100 kHz operating frequency. If the two buses are operating at different frequencies, the 100 kHz bus must be isolated when the 400 kHz operation of the other bus is required. If the master is running at 400 kHz, the maximum system operating frequency may be less than 400 kHz because of the delays added by the translator.

As with the standard I2C-bus system, pull-up resistors are required to provide the logic HIGH levels on the translator’s bus. The PCA9306 has a standard open-collector configuration of the I2C-bus. The size of these pull-up resistors depends on the system, but each side of the translator must have a pull-up resistor. The device is designed to work with Standard-mode, Fast-mode and Fast mode Plus I2C-bus devices in addition to SMBus devices.

Product Features

■ 2-bit bidirectional translator for SDA and SCL lines in mixed-mode I2C-bus applications

■ Standard-mode, Fast-mode, and Fast-mode Plus I2C-bus and SMBus compatible

■ Less than 1.5 ns maximum propagation delay to accommodate Standard mode and Fast mode I2C-bus devices and multiple masters

■ Allows voltage level translation between:

◆ 1.0 V Vref(1) and 1.8 V, 2.5 V, 3.3 V or 5 V Vbias(ref)(2)

◆ 1.2 V Vref(1) and 2.5 V, 3.3 V or 5 V Vbias(ref)(2)

◆ 1.8 V Vref(1) and 3.3 V or 5 V Vbias(ref)(2)

◆ 2.5 V Vref(1) and 5 V Vbias(ref)(2)

◆ 3.3 V Vref(1) and 5 V Vbias(ref)(2)

■ Provides bidirectional voltage translation with no direction pin

■ Low 3.5 Ω ON-state connection between input and output ports provides less signal distortion

■ Open-drain I2C-bus I/O ports (SCL1, SDA1, SCL2 and SDA2)

■ 5 V tolerant I2C-bus I/O ports to support mixed-mode signal operation

■ High-impedance SCL1, SDA1, SCL2 and SDA2 pins for EN = LOW

■ Lock-up free operation for isolation when EN = LOW

■ Flow through pinout for ease of printed-circuit board trace routing

■ ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101

■ Packages offered: SO8, TSSOP8, VSSOP8, XQFN8

Product Photos

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