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ADuM1253 - I2C Isolator

General Description

The ADuM1253 offers two open-drain channels, one unidirectional and one bidirectional for applications, such as I2C, that require data to be transmitted in both directions on the same line but have a unidirectional clock.

Key Features

  • conventional buffers that do not regulate logic-low output voltage. The ADuM1253 features independent 1.71V to 5.5V supplies on both side 1 and side 2 of the isolator. The device operates up to 2MHz. The ultra-low standby current of 21µA per side is ideal for battery-operated systems. The ADuM1253 provides a disturbance-free bus connection for hot-plug connections on side 2 by first precharging the bus pins and then monitoring the bus state for either an idle bus or detection of a I2C stop condi.

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Other Datasheets by Analog Devices

Part Number Description
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ADUM1210 Dual-Channel Digital Isolator
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ADUM1230 Isolated Half-Bridge Driver
ADUM1233 Precision Half-Bridge Driver
ADuM1234 Precision Half-Bridge Driver

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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Ultra-Low-Power, I2C Isolator with Unidirectional SCL, Extended VDD, Idle-Bus Hot-Swap, and Low VOL ADuM1253 General Description The ADuM1253 offers two open-drain channels, one unidirectional and one bidirectional for applications, such as I2C, that require data to be transmitted in both directions on the same line but have a unidirectional clock. To prevent latch-up action, side 1 outputs comprise special buffers that regulate the logic-low voltage at 0.64V, and the input logic-low threshold is at least 50mV lower than the output logic-low voltage. Side 2 features conventional buffers that do not regulate logic-low output voltage. The ADuM1253 features independent 1.71V to 5.5V supplies on both side 1 and side 2 of the isolator. The device operates up to 2MHz.