General description
The PCA9617A is a CMOS integrated circuit that provides level shifting between low voltage (0.8 V to 5.5 V) and higher voltage (2.2 V to 5.5 V) Fast-mode Plus (Fm+) I2C-bus or SMBus applications. While retaining all the operating modes and features of the I2C-bus system during the level shifts, it also permits extension of the I2C-bus by providing bidirectional buffering for both the data (SDA) and the clock (SCL) lines, thus enabling two buses of 540 pF at 1 MHz or up to 4000 pF at lower speeds. Using the PCA9617A 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 PCA9617A is unpowered.

Features and benefits
■ 2 channel, bidirectional buffer isolates capacitance and allows 540 pF on either side of
   the device at 1 MHz and up to 4000 pF at lower speeds
■ Voltage level translation from 0.8 V to 5.5 V and from 2.2 V to 5.5 V
■ Footprint and functional replacement for PCA9517A at Fast-mode speeds
■ Port A operating supply voltage range of 0.8 V to 5.5 V with normal levels
■ Port B operating supply voltage range of 2.2 V to 5.5 V with static offset level
■ 5 V tolerant I2C-bus and enable pins
■ 0 Hz to 1000 kHz clock frequency (the maximum system operating frequency may be
   less than 1000 kHz 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
■ ESD protection exceeds 5500 V HBM per JESD22-A114 and 1000 V CDM per
   JESD22-C101
■ Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
■ Packages offered: TSSOP8 and HWSON8