TI TCA9517ADGKR

电压电平0.9 V ~ 5.5 V2.7 V ~ 5.5 V

Overview

The TCA9517is abidirectional buffer with level shifting capabilities for I2C and SMBussystems. It provides bidirectional voltage-level translation (up-translation/down-translation)between low voltages (down to 0.9 V) and higher voltages (2.7 V to 5.5 V) in mixed-modeapplications. This device enables I2C and SMBus systems to be extendedwithout degradation of performance, even during level shifting.

As with the standard I2C system, pullup resistors are requiredto provide the logic-high levels on the buffered bus. The TCA9517ADGKR has standard open-drain configuration of theI2C bus. The size of these pullup resistors depends on the system, buteach side of the repeater must have a pullup resistor. The device is designed to work with Standardmode and Fast mode I2C devices in addition to SMBus devices. Standardmode I2C devices only specify 3 mA in a genericI2C system, where Standard mode devices and multiple masters arepossible. Under certain conditions, higher termination currents can be used.

Features

Two-Channel Bidirectional Buffer

I²C Bus and SMBus Compatible

Operating Supply Voltage Range of 0.9 V to 5.5 V on the A-side

Operating Supply Voltage Range of 2.7 V to 5.5 V on the 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

Applications

Servers

Routers (Telecom Switching Equipment)

Industrial Equipment

Products with Many I²C Slaves and Long PCB Traces