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PCF8574_PCF8574A

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    1. General description The PCF8574/74A provides general-purpose remote I/O expansion via the two-wire bidirectional I 2 C-bus (serial clock (SCL), serial data (SDA)).The devices consist of eight quasi-bidirectional ports, 100kHz I 2 C-bus interface, three hardware address inputs and interrupt output operating between 2.5V and 6V. 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 same I 2 C-bus, so there can be up to 16 of these I/O expanders PCF8574/74A together on the same I 2 C-bus, supporting up to 128I/Os (for example, 128LEDs).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 polling the input register via the I 2 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  I 2 C-bus to parallel port expander   100kHz I 2 C-bus interface (Standard-mode I 2 C-bus)  Operating supply voltage 2.5V to 6V 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 80mA   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 2000V HBM per JESD22-A114 and 1000V CDM per JESD22-C101 PCF8574; PCF8574A Remote 8-bit I/O expander for I 2 C-bus with interrupt Rev. 5 — 27 May 2013Product data sheet  PCF8574_PCF8574AAll information provided in this document is subject to legal disclaimers.© NXP B.V. 2013. All rights reserved. Product data sheetRev. 5 — 27 May 2013 2 of 33 NXP Semiconductors PCF8574; PCF8574A Remote 8-bit I/O expander for I 2 C-bus with interrupt  Latch-up testing is done to JEDEC standard JESD78 which exceeds 100mA  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   4.1Ordering options   Table 1.Ordering informationType numberTopside markPackageNameDescriptionVersion PCF8574PPCF8574PDIP16plastic dual in-line package; 16 leads (300mil)SOT38-4PCF8574APPCF8574APPCF8574T/3PCF8574TSO16plastic small outline package; 16leads; bodywidth7.5mmSOT162-1PCF8574AT/3PCF8574ATPCF8574TS/38574TSSSOP20plastic shrink small outline package; 20leads; bodywidth4.4mmSOT266-1PCF8574ATS/38574A Table 2.Ordering optionsType numberOrderable partnumber PackagePacking methodMinimum order quantityTemperature range PCF8574PPCF8574P,112DIP16Standard marking *IC’stube - DSC bulk pack1000T amb =   40   C to +85   CPCF8574APPCF8574AP,112DIP16Standard marking *IC’stube - DSC bulk pack1000T amb =   40   C to +85   CPCF8574T/3PCF8574T/3,512SO16Standard marking * tube drypack1920T amb =   40   C to +85   CPCF8574T/3,518SO16Reel 13” Q1/T1 *standard mark SMD drypack1000T amb =   40   C to +85   CPCF8574AT/3PCF8574AT/3,512SO16Standard marking * tube drypack1920T amb =   40   C to +85   CPCF8574AT/3,518SO16Reel 13” Q1/T1 *standard mark SMD drypack1000T amb =   40   C to +85   C  PCF8574_PCF8574AAll information provided in this document is subject to legal disclaimers.© NXP B.V. 2013. All rights reserved. Product data sheetRev. 5 — 27 May 2013 3 of 33 NXP Semiconductors PCF8574; PCF8574A Remote 8-bit I/O expander for I 2 C-bus with interrupt 5. Block diagram   PCF8574TS/3PCF8574TS/3,112SSOP20Standard marking *IC’stube - DSC bulk pack1350T amb =   40   C to +85   CPCF8574TS/3,118SSOP20Reel 13” Q1/T1 *standard mark SMD2500T amb =   40   C to +85   CPCF8574ATS/3PCF8574ATS/3,118SSOP20Reel 13” Q1/T1 *standard mark SMD2500T amb =   40   C to +85   C Table 2.Ordering options  …continued Type numberOrderable partnumber PackagePacking methodMinimum order quantityTemperature rangeFig 1.Block diagramFig 2.Simplified schematic diagram of P0 to P7 002aad624 INTI 2 C-BUSCONTROLLP FILTER PCF8574PCF8574A INTERRUPTLOGIC A0 A1 A2INPUTFILTERSHIFTREGISTERSDASCL8 bitswrite pulseread pulsePOWER-ONRESETV DD V SS I/OPORTP0P1P2P3P4P5P6P7 002aac109  write pulseread pulseDCISFFQpower-on resetdata from Shift RegisterI trt(pu)100 µ A I OH I OL V DD P0 to P7V SS DCISFFQdata to Shift Registerto interrupt logic  PCF8574_PCF8574AAll information provided in this document is subject to legal disclaimers.© NXP B.V. 2013. All rights reserved. Product data sheetRev. 5 — 27 May 2013 4 of 33 NXP Semiconductors PCF8574; PCF8574A Remote 8-bit I/O expander for I 2 C-bus with interrupt 6. Pinning information 6.1Pinning   6.2Pin description   Fig 3.Pin configuration for DIP16Fig 4.Pin configuration for SO16Fig 5.Pin configuration for SSOP20 PCF8574PPCF8574AP A0V DD A1SDAA2SCLP0INTP1P7P2P6P3P5V SS P4 002aad625  12345678109121114131615  A0 V DD  A1 SDA A2 SCLP0 INTP1 P7P2 P6P3 P5V SS  P4 PCF8574T/3PCF8574AT/3 002aad626 12345678109121114131615 PCF8574TS/3PCF8574ATS/3 P7SCLP6n.c.n.c.SDAP5P4 A0 A1P3n.c.n.c. A2P2P0P1 002aad627 1234567891012111413161518172019V DD INTV SS Table 3.Pin descriptionSymbolPinDescriptionDIP16, SO16SSOP20  A016address input 0 A127address input 1 A239address input 2P0410quasi-bidirectional I/O 0P1511quasi-bidirectional I/O 1P2612quasi-bidirectional I/O 2P3714quasi-bidirectional I/O 3V SS 815supply groundP4916quasi-bidirectional I/O 4P51017quasi-bidirectional I/O 5P61119quasi-bidirectional I/O 6P71220quasi-bidirectional I/O 7INT131interrupt output (active LOW)SCL142serial clock lineSDA154serial data lineV DD 165supply voltagen.c.-3, 8, 13, 18not connected
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