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TI PCA9536
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PCA9536 is a 4-bit bidirectional I/O expander utilizing I2C and designed for 2.3-V to 5.5-V VCC operation. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL), serial data (SDA)].

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Technical Details
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* 4-bit I2C-bus Output Channels
* Polarity Inversion register
* Low standby current
* No glitch on power-up
* Internal power-on reset
* 0 Hz to 400 kHz I2C-bus clock frequency
* ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101

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