PCF8574 PCF8574A 2 Remote 8-bit I/O expander for I C-bus with interrupt Rev. 5 27 May 2013 Product data sheet 1. General description The PCF8574/74A 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, 100 kHz I C-bus interface, three hardware address inputs and interrupt output operating between 2.5 V and 6 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. System master can read from the input port or write to the output port through a single register. The low current consumption of 2.5 A (typical, static) is great for mobile applications and the latched output ports directly drive LEDs. The PCF8574 and PCF8574A 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 PCF8574/74A 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 2 100 kHz I C-bus interface (Standard-mode I C-bus) Operating supply voltage 2.5 V to 6 V with non-overvoltage tolerant I/O held to V DD with 100 A current source 8-bit remote I/O pins that default to inputs at power-up Latched outputs directly drive LEDs Total package sink capability of 80 mA Active LOW open-drain interrupt output Eight programmable slave addresses using three address pins Low standby current (2.5 A typical) 40 C to +85 C operation ESD protection exceeds 2000 V HBM per JESD22-A114 and 1000 V CDM per JESD22-C101PCF8574 PCF8574A NXP Semiconductors 2 Remote 8-bit I/O expander for I C-bus with interrupt Latch-up testing is done to JEDEC standard JESD78 which exceeds 100 mA Packages offered: DIP16, SO16, SSOP20 3. Applications LED signs and displays Servers Key pads Industrial control Medical equipment PLC 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 PCF8574P PCF8574P DIP16 plastic dual in-line package 16 leads (300 mil) SOT38-4 PCF8574AP PCF8574AP PCF8574T/3 PCF8574T SO16 plastic small outline package 16 leads body width 7.5 mm SOT162-1 PCF8574AT/3 PCF8574AT PCF8574TS/3 8574TS SSOP20 plastic shrink small outline package 20 leads SOT266-1 body width 4.4 mm PCF8574ATS/3 8574A 4.1 Ordering options Table 2. Ordering options Type number Orderable Package Packing method Minimum Temperature range part number order quantity PCF8574P PCF8574P,112 DIP16 Standard marking 1000 T = 40 C to +85 C amb * ICs tube - DSC bulk pack PCF8574AP PCF8574AP,112 DIP16 Standard marking 1000 T = 40 C to +85 C amb * ICs tube - DSC bulk pack PCF8574T/3 PCF8574T/3,512 SO16 Standard marking 1920 T = 40 C to +85 C amb * tube dry pack PCF8574T/3,518 SO16 Reel 13 Q1/T1 1000 T = 40 C to +85 C amb *standard mark SMD dry pack PCF8574AT/3 PCF8574AT/3,512 SO16 Standard marking 1920 T = 40 C to +85 C amb * tube dry pack PCF8574AT/3,518 SO16 Reel 13 Q1/T1 1000 T = 40 C to +85 C amb *standard mark SMD dry pack PCF8574 PCF8574A All information provided in this document is subject to legal disclaimers. NXP B.V. 2013. All rights reserved. Product data sheet Rev. 5 27 May 2013 2 of 33
