PCF8574A

具有中断的 8 位 2.5V 至 5.5V I2C/SMBus I/O 扩展器; • Low standby-current consumption of 10 µA max\n• I2C to parallel-port expander\n• Open-drain interrupt output\n• Compatible with most microcontrollers\n• Latched outputs with high-current drive capability for directly driving LEDs\n• Latch-up performance exceeds 100 mA Per JESD 78, Class II;

This 8-bit input/output (I/O) expander for the two-line bidirectional bus (I2C) is designed for 2.5-V to 6-V VCC operation.\n\nThe PCF8574A device provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL), serial data (SDA)].\n\nThe device features an 8-bit quasi-bidirectional I/O port (P0–P7), including latched outputs with high-current drive capability for directly driving LEDs. Each quasi-bidirectional I/O can be used as an input or output without the use of a data-direction control signal. At power on, the I/Os are high. In this mode, only a current source to VCC is active.

PCF8574A

REMOTE 8-BIT I/O EXPANDER FOR I2C BUS

PCF8574A

REMOTE 8-BIT I/O EXPANDER FOR I2C BUS

PCF8574A

REMOTE 8BIT I/O EXPANDER FOR I2C BUS

PCF8574A

Smart, simple solutions for the 12 most common design concerns

ETC

PCF8574AP

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

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

PHI

PCF8574AT

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

PCF8574AT

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

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

PHI

PCF8574ATS

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

PCF8574A_05

REMOTE 8-BIT I/O EXPANDER FOR I2C BUS