UNISONIC TECHNOLOGIES CO., LTD

UCA9617

Preliminary

CMOS IC

www.unisonic.com.tw

1 of 8

Copyright © 2019 Unisonic Technologies Co., Ltd

QW-R140-017.a

LEVEL TRANSLATING FM+

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DESCRIPTION

The UCA9617 enables I

The UCA9617 contains two bidirectional open-drain buffers

specifically designed to support up-translation/down-translation

between the low voltage (as low as 0.8V) and a 2.5V, 3.3V or 5V

I

the UCA9617 enables the system designer to isolate two halves of a

bus for both voltage and capacitance. The SDA and SCL pins are

overvoltage tolerant and are high-impedance when the UCA9617 is

unpowered.

be applied in any sequence at power-up.

port B pull-down driver is turned off and the external pull-up resistor pulls the pin HIGH. When port B falls first and

goes below 0.4V, the port A driver is turned on and port A pulls down to ~ 0V. The port A pull-down is not enabled

unless the port B voltage goes below 0.4V.

If the port B low voltage goes below 0.4V, the port B pull-down driver is enabled and port B will onl y be able to

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FEATURES

* Footprint and functional replacement for UCA9617 at

Fast-mode speeds

* 2 channel, bidirectional buffer isolates capacitance and

allows 540pF on either side of the device at 1 MHz and

up to 4000pF at lower speeds

* Voltage level translation from 0.8V to 5.5V and from 2.2V

to 5.5V

* Port A operating supply voltage range of 0.8V to 5.5V

with normal levels

* Port B operating supply voltage range of 2.2V to 5.5V

with static offset level

* 5V tolerant I

* 0Hz to 1000kHz clock frequency (the maximum system

operating frequency may be less than 1000kHz because

of the delays added by the repeater)

* Open-drain input/outputs

* Latching free operation

* Supports arbitration and clock stretching across the

repeater

* Accommodates Standard-mode, Fast-mode and

Fast-mode Plus I

high power mode), PMBus and multiple masters

* Powered-off high-impedance I