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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