PCF8574T

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

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

PHI

PCF8574T

Remote 8-bit I/O expander for I2C\\u2011bus with interrupt; I2C-bus to parallel port expander\n100 kHz I2C?bus interface (Standard-mode I2C-bus)\nOperating supply voltage 2.5 V to 6?V with non-overvoltage tolerant I/O held to VDD with 100?μA current source\n8-bit remote I/O pins that default to inputs at power-up\nLatched outputs directly drive LEDs\nTotal package sink capability of 80?mA\nActive LOW open-drain interrupt output\nEight programmable slave addresses using three address pins\nLow standby current (2.5?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: DIP16, SO16, SSOP20\n;

The PCF8574/74A 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, 100?kHz I2C?bus interface, threehardware address inputs and interrupt output operating between 2.5?V and 6?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. Systemmaster can read from the input port or write to the output port through a single register.\nThe low current consumption of 2.5?μA (typical, static) is great for mobile applications andthe latched output ports directly drive LEDs.\nThe PCF8574 and PCF8574A 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 PCF8574/74A 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

恩XP

PCF8574T

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

PHI

PCF8574T

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

ETC

PCF8574TS

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

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

PHI

PCF8574TS

Remote 8-bit I/O expander for I2C\\u2011bus with interrupt; I2C-bus to parallel port expander\n100 kHz I2C?bus interface (Standard-mode I2C-bus)\nOperating supply voltage 2.5 V to 6?V with non-overvoltage tolerant I/O held to VDD with 100?μA current source\n8-bit remote I/O pins that default to inputs at power-up\nLatched outputs directly drive LEDs\nTotal package sink capability of 80?mA\nActive LOW open-drain interrupt output\nEight programmable slave addresses using three address pins\nLow standby current (2.5?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: DIP16, SO16, SSOP20\n;

The PCF8574/74A 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, 100?kHz I2C?bus interface, threehardware address inputs and interrupt output operating between 2.5?V and 6?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. Systemmaster can read from the input port or write to the output port through a single register.\nThe low current consumption of 2.5?μA (typical, static) is great for mobile applications andthe latched output ports directly drive LEDs.\nThe PCF8574 and PCF8574A 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 PCF8574/74A 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

恩XP

PCF8574T/3

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

ETC

PCF8574T-3.518

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

ETC

PCF8574TS

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

PHI

PCF8574TS

I2C Demonstration Board 2005-1 Quick Start Guide

PHI