PCA8574AN

Remote 8-bit I/O expander for I²C-bus with interrupt; I²C‑bus to parallel port expander\n400 kHz I²C‑bus interface (Fast-mode I²C‑bus)\nOperating supply voltage 2.3 V to 5.5 V with 5.5 V tolerant I/Os held to VDD with 100 μA current source\n8-bit remote I/O pins that default to inputs at power-up\nLatched outputs with 25 mA sink capability for directly driving LEDs\nTotal package sink capability of 200 mA\nActive LOW open-drain interrupt output\nEight programmable slave addresses using three address pins\nLow standby current (4.5 μA typical)\n-40 °C to +85 °C operation\nESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101\nLatch-up testing is done to JEDEC standard JESD78 which exceeds 100 mA\nPackages offered: SO16, TSSOP16, SSOP20\n;

The PCA8574/74A provides general-purpose remote I/O expansion via the two-wirebidirectional I²C‑bus (serial clock (SCL), serial data (SDA)).\nThe devices consist of eight quasi-bidirectional ports, 400 kHz I²C‑bus interface, threehardware address inputs and interrupt output operating between 2.3 V and 5.5 V. Thequasi-bidirectional port can be independently assigned as an input to monitor interruptstatus or keypads, or as an output to activate indicator devices such as LEDs. The systemmaster can read from the input port or write to the output port through a single register.\nThe low current consumption of 4.5 μA (typical, static) is great for mobile applications andthe latched output ports have 25 mA high current sink drive capability for directly drivingLEDs.\nThe PCA8574 and PCA8574A are identical, except for the different fixed portion of theslave address. The three hardware address pins allow eight of each device to be on thesame I²C‑bus, so there can be up to 16 of these I/O expanders PCA8574/74A together onthe same I²C‑bus, supporting up to 128 I/Os (for example, 128 LEDs).\nThe active LOW open-drain interrupt output (INT) can be connected to the interrupt logicof the microcontroller and is activated when any input state differs from its correspondinginput port register state. It is used to indicate to the microcontroller that an input state haschanged and the device needs to be interrogated without the microcontroller continuouslypolling the input register via the I²C‑bus.\nThe internal Power-On Reset (POR) initializes the I/Os as inputs with a weak internalpull-up 100 μA current source.\n

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PCA8574AN

Remote 8-bit I/O expander for I2C-bus with interrupt

ETC

PCA8574APW

Remote8-bitI/OexpanderforI2C-buswithinterrupt

ETC

PCA8574ATS

Remote8-bitI/OexpanderforI2C-buswithinterrupt

ETC

PCA8574D

Remote8-bitI/OexpanderforI2C-buswithinterrupt

ETC

PCA8574N

Remote8-bitI/OexpanderforI2C-buswithinterrupt

ETC

PCA8574PW

Remote8-bitI/OexpanderforI2C-buswithinterrupt

ETC

PCA8574TS

Remote8-bitI/OexpanderforI2C-buswithinterrupt

ETC

PCF8574

REMOTE8-BITI/OEXPANDERFORI2CBUS

PCF8574

Remote8-bitI/OexpanderforI2C-bus

GENERALDESCRIPTION ThePCF8574isasiliconCMOScircuit.ItprovidesgeneralpurposeremoteI/Oexpansionformostmicrocontrollerfamiliesviathetwo-linebidirectionalbus(I2C-bus). Thedeviceconsistsofan8-bitquasi-bidirectionalportandanI2C-businterface.ThePCF8574hasalowcur

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