UCA9306L-S08-R datasheet(6/9 Pages) UTC

6 / 9 page

UCA9306

Preliminary

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

6 of 9

www.unisonic.com.tw

QW-R140-004.b



APPLICATION INFORMATION

General Applications of I

As with the standard I

2C system ,pull up resistors are required to provide the logic-high levels on the translator

bus .The size of these pull up resistors depends on the system , but each side of the repeater must have a pull up

resistor. The device is designed to work with standard-mode and fast-mode I

2C devices, in addition to SMBus

devices . Standard-mode I

2C devices only specify 3 mA in a generic I2C system where standard-mode devices and

multiple masters are possible. Under certain conditions, high termination currents can be used. When the SDA1 or

SDA2 port is low, the clamp is in the ON state , and a low-resistance connection exists between the SDA1 and SDA2

ports . Assuming the higher voltage is on the SDA2 port when the SDA2 port is high , the voltage on the SDA1 port

is limited to the voltage set by VREF1 . When the SDA1 port is high, the SDA2 port is pulled to the pull up supply

voltage of the drain (VDPU) by the pull up resistors. This functionality allows a seamless translation between higher

and lower voltages selected by the user , without the need for directional control . The SCL1-SCL2 channel also

functions in the same way as the SDA1-SDA2 channel.

UCA9306L-S08-R 数据表(PDF) 6 Page - Unisonic Technologies