PCA8574D,518 NXP

PCA8574 PCA8574A 2 Remote 8-bit I/O expander for I C-bus with interrupt Rev. 3 3 June 2013 Product data sheet 1. General description The PCA8574/74A provides general-purpose remote I/O expansion via the two-wire 2 bidirectional I C-bus (serial clock (SCL), serial data (SDA)). 2 The devices consist of eight quasi-bidirectional ports, 400 kHz I C-bus interface, three hardware address inputs and interrupt output operating between 2.3 V and 5.5 V. The quasi-bidirectional port can be independently assigned as an input to monitor interrupt status or keypads, or as an output to activate indicator devices such as LEDs. The system master can read from the input port or write to the output port through a single register. The low current consumption of 4.5 A (typical, static) is great for mobile applications and the latched output ports have 25 mA high current sink drive capability for directly driving LEDs. The PCA8574 and PCA8574A are identical, except for the different fixed portion of the slave address. The three hardware address pins allow eight of each device to be on the 2 same I C-bus, so there can be up to 16 of these I/O expanders PCA8574/74A together on 2 the same I C-bus, supporting up to 128 I/Os (for example, 128 LEDs). The active LOW open-drain interrupt output (INT) can be connected to the interrupt logic of the microcontroller and is activated when any input state differs from its corresponding input port register state. It is used to indicate to the microcontroller that an input state has changed and the device needs to be interrogated without the microcontroller continuously 2 polling the input register via the I C-bus. The internal Power-On Reset (POR) initializes the I/Os as inputs with a weak internal pull-up 100 A current source. 2. Features and benefits 2 I C-bus to parallel port expander 2 2 400 kHz I C-bus interface (Fast-mode I C-bus) Operating supply voltage 2.3 V to 5.5 V with 5.5 V tolerant I/Os held to V with DD 100 A current source 8-bit remote I/O pins that default to inputs at power-up Latched outputs with 25 mA sink capability for directly driving LEDs Total package sink capability of 200 mA Active LOW open-drain interrupt output Eight programmable slave addresses using three address pins Low standby current (4.5 A typical) 40 C to +85 C operationPCA8574 PCA8574A NXP Semiconductors 2 Remote 8-bit I/O expander for I C-bus with interrupt ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101 Latch-up testing is done to JEDEC standard JESD78 which exceeds 100 mA Packages offered: SO16, TSSOP16, SSOP20 3. Applications LED signs and displays Servers Key pads Industrial control Medical equipment PLCs Cellular telephones Mobile devices Gaming machines Instrumentation and test measurement 4. Ordering information Table 1. Ordering information Type number Topside mark Package Name Description Version 1 PCA8574D PCA8574D SO16 plastic small outline package 16 leads body width 7.5 mm SOT162-1 2 PCA8574AD PCA8574AD PCA8574PW PCA8574 TSSOP16 plastic thin shrink small outline package 16 leads SOT403-1 body width 4.4 mm PCA8574APW PA8574A 3 PCA8574TS PCA8574 SSOP20 plastic shrink small outline package 20 leads SOT266-1 body width 4.4 mm 4 PCA8574ATS PA8574A 1 PCA8574D drop-in replacement for PCF8574T/3. 2 PCA8574AD drop-in replacement for PCF8574AT/3. 3 PCA8574TS drop-in replacement for PCF8574TS/3. 4 PCA8574ATS drop-in replacement for PCF8574ATS/3. PCA8574 PCA8574A All information provided in this document is subject to legal disclaimers. NXP B.V. 2013. All rights reserved. Product data sheet Rev. 3 3 June 2013 2 of 32