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1 Features

1? Two-Channel Bidirectional Buffer

? I2C Bus and SMBus Compatible

? Operating Supply Voltage Range of 0.9 V to 5.5 V

on A-side

? Operating Supply Voltage Range of 2.7 V to 5.5 V

on B-side

? Voltage-Level Translation From 0.9 V - 5.5 V to

2.7 V - 5.5 V

? Footprint and Functional Replacement for

PCA9515B

? Active-High Repeater-Enable Input

? Open-Drain I2C I/O

? 5.5-V Tolerant I2C and Enable Input Support

Mixed-Mode Signal Operation

? Accommodates Standard Mode and Fast Mode

I2C Devices and Multiple Masters

? High-Impedance I2C Pins When Powered-Off

? Latch-Up Performance Exceeds 100 mA Per

JESD 78, Class II

? ESD Protection Exceeds JESD 22

– 5500 V Human-Body Model (A114-A)

– 200 V Machine Model (A115-A)

– 1000 V Charged-Device Model (C101)

2 Applications

? Servers

? Routers (Telecom Switching Equipment)

? Industrial Equipment

? Products with Many I2C Slaves and/or Long PCB

Traces

3 Description

The TCA9517 is a bidirectional buffer with level

shifting capabilities for I2C and SMBus systems. It

provides bidirectional voltage-level translation (uptranslation/

down-translation) between low voltages

(down to 0.9 V) and higher voltages (2.7 V to 5.5 V)

in mixed-mode applications. This device enables I2C

and SMBus systems to be extended without

degradation of performance, even during level

shifting.

The TCA9517 buffers both the serial data (SDA) and

the serial clock (SCL) signals on the I2C bus, thus

allowing two buses of up to 400-pF bus capacitance

to be connected in an I2C application.

The TCA9517 has two types of drivers: A-side drivers

and B-side drivers. All inputs and I/Os are overvoltage

tolerant to 5.5 V, even when the device is

unpowered (VCCB and/or VCCA = 0 V).