PCF8574P
Remote 8-bit I/O expander for I²C‑bus with interrupt
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The PCF8574/74A provides general-purpose remote I/O expansion via the two-wire bidirectional I²C‑bus (serial clock (SCL), serial data (SDA)).
The devices consist of eight quasi-bidirectional ports, 100 kHz I²C‑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 μA (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 I²C‑bus, so there can be up to 16 of these I/O expanders PCF8574/74A together on the same I²C‑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 polling the input register via the I²C‑bus.
The internal Power-On Reset (POR) initializes the I/Os as inputs with a weak internal pull-up 100 μA current source.
Features and benefits
- I²C-bus to parallel port expander
- 100 kHz I²C‑bus interface (Standard-mode I²C-bus)
- Operating supply voltage 2.5 V to 6 V with non-overvoltage tolerant I/O held to VDD with 100 μA 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 μA typical)
- -40 °C to +85 °C operation
- 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: DIP16, SO16, SSOP20
Applications
- LED signs and displays
- Servers
- Key pads
- Industrial control
- Medical equipment
- PLC
- Cellular telephones
- Mobile devices
- Gaming machines
- Instrumentation and test measurement
- Series PCF8574
Remote 8-bit I/O expander for I²C‑bus with interrupt
- Parametric search all I2C general purpose I/O
All information on this product information page is subject to the subsequent disclaimers:
Parametrics of this product
| Type number | Package | Number of bits | Source Current per bit(mA) | I2C-bus(kHz) | Operating voltage(VDC) | Weak Pull-Up Current Source | Max Sink Current per bit(mA) | # of Addresses | Max Sink Current, per package(mA) | Enable | Operating Temperature(Cel) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| PCF8574P | SOT38-4 (DIP16) | 8 | 0 | 100 | 2.5~6.0 | yes | 20 | 8 | 100 | -40~85 | -40~85 |
Similar products
- Series PCF8574
- Parametric search all I<sup>2</sup>C general purpose I/O
- Parametrics series
Package
| Type number | Orderable part number | Ordering code (12NC) | Product status | Package | Packing | Marking |
|---|---|---|---|---|---|---|
| PCF8574P | PCF8574P,112 | 9337 060 60112 | Volume production | SOT38-4 (DIP16) | Bulk Pack | PCF8574P |
Outline drawing
| Package Version | Package Name | Package Description | Reference Codes | Issue Date |
|---|---|---|---|---|
| SOT38-4 | DIP16 | plastic dual in-line package; 16 leads (300 mil) | 2003-02-13 |
Quality, reliability & chemical content
| Type number | Orderable part number | Chemical content | RoHS | Leadfree conversion date | RHF | IFR (FIT) | MTBF (hours) | MSL | MSL LF |
|---|---|---|---|---|---|---|---|---|---|
| PCF8574P | PCF8574P,112 | PCF8574P |  | Always Pb-free |  |
Documentation for this product
| File name | Title | Type | Format | Date |
|---|---|---|---|---|
| PCF8574_PCF8574A | Remote 8-bit I/O expander for I2C-bus with interrupt | Data sheet | 2013-05-27 | |
| AN10441 | Level shifting techniques in I2C-bus design | Application note | 2007-06-20 | |
| AN256 | PCA9500/PCA9501 provides simple card maintenance and control using I²C-bus | Application note | 2009-03-23 | |
| AN469 | I2C/SMBus general purpose I/O expanders | Application note | 2005-01-20 | |
| AN10216 | I2C manual | Application note | 2003-03-27 | |
| AN96007 | P83CE258 for High-End RDS/EON Car Radio System CCR520S V2.5 | Application note | 1996-02-01 | |
| AN10369 | UART/SPI/I2C code examples | Application note | 2005-04-12 | |
| AN96029 | High-end RDS/EON car radio system CCR612 user manual | Application note | 2003-03-14 | |
| 75016543 | Create smarter, more efficient white goods; An industry-leading portfolio of cost-effective, power-saving solutions for major home appliances | Brochure | 2008-06-01 | |
| 75016020 | Low-power GPIO expanders for portable applications; NXP 8/16-bit I2C/SMBus GPIO expanders PCA9534/35/35C for low-power applications | Leaflet | 2007-06-01 | |
| 75016535 | Versatile, easy-to-use GPIO expanders; NXP 4/8/16-bit I2C/SMBus GPIO expanders PCA9536/54/54A/55 | Leaflet | 2008-08-01 | |
| 75016018 | Combination GPIO expanders and EEPROMs for smaller boards; NXP 8-bit I2C/SMBus GPIO expanders with 2-K EEPROM PCA9500/01 | Leaflet | 2007-06-01 | |
| 75017424 | NXP I2C-bus solutions 2013: Smart, simple solutions for the 12 most common design concerns | Leaflet | 2013-05-23 | |
| design_con_2003_tecforum_i2c_bus_overview | DesignCon 2003 TecForum I 2 C Bus Overview | Other type | 2003-01-27 | |
| UM10204 | I2C-bus specification and user manual | User manual | 2007-06-26 | |
| UM10206 | I2C Demonstration Board 2005-1 Quick Start Guide | User manual | 2006-06-13 | |
| UM10267 | PCA9698 demonstration board OM6281 | User manual | 2008-09-26 | |
| UM10204_JA | I2C-bus specification and user manual | User manual | 2013-04-03 |
Support links
- IBIS and HSPICE Model (standardics.nxp.com/support/tools/)
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