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        Home > Miscellaneous
        UCA9617 Datasheet
         LEVEL TRANSLATING FM+ I2 C-BUS REPEATER

         

        DESCRIPTION

         

        The UCA9617 enables I2C-bus  or SMBus translation down to

        VCC(A) as low as 0.8V without degradation of system performance.

        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

        I2C-bus or SMBus. All inputs and I/Os are overvoltage tolerant to 5.5V

        even when the device is unpowered (VCC(B) and/or VCC(A)=0V). Using

        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.

        The UCA9617 includes a power-up circuit that keeps the output drivers turned off until VCC(B) is above 2.2V and

        until after the internal reference circuits have settled ~ 400μs, and the VCC(A) is above 0.8V. VCC(B) and VCC(A) can

        be applied in any sequence at power-up.

        After power-up and with the enable (EN) HIGH, a LOW level on port A (below 0.3VCC(A)) turns the corresponding

        port B driver (either SDA or SCL) on and drives port B down to about 0.55V. When port A rises above 0.3VCC(A), the

        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

        rise to 0.55V until port A rises above 0.3VCC(A), then port B will continue to rise being pulled up by the external pull-up

        resistor. The VCC(A) is only used to provide the 0.35VCC(A) reference to the port A input comparators and for the

        power good detect circuit. The UCA9617 includes a VCC(A) overvoltage disable that turns the channel off if

        0.4VCC(A)+0.8V>VCC(B). The UCA9617 logic and all I/Os are powered by the VCC(B) pin.

         

         

        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 I2C-bus and enable pins

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

         operating frequency may be less than 1000kHz because

         of the delays added by the repeater)

        * Active HIGH repeater enable input referenced to VCC(B)

        * Open-drain input/outputs

        * Latching free operation

        * Supports arbitration and clock stretching across the

         repeater

        * Accommodates Standard-mode, Fast-mode and

         Fast-mode Plus I2C-bus devices, SMBus (standard and

         high power mode), PMBus and multiple masters

        * Powered-off high-impedance I2C-bus pins 

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