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NXP Semiconductors Electronic Components Datasheet

PCF8574 Datasheet

Remote 8-bit I/O expander

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PCF8574; PCF8574A
Remote 8-bit I/O expander for I2C-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
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 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 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 A current source.
2. 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 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-C101


NXP Semiconductors Electronic Components Datasheet

PCF8574 Datasheet

Remote 8-bit I/O expander

No Preview Available !

NXP Semiconductors
PCF8574; PCF8574A
Remote 8-bit I/O expander for I2C-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
PCF8574P
PCF8574AP
PCF8574T/3
PCF8574AT/3
PCF8574TS/3
PCF8574ATS/3
PCF8574P
PCF8574AP
PCF8574T
PCF8574AT
8574TS
8574A
Package
Name
DIP16
Description
plastic dual in-line package; 16 leads (300 mil)
SO16
plastic small outline package; 16 leads; body width 7.5 mm
SSOP20 plastic shrink small outline package; 20 leads;
body width 4.4 mm
Version
SOT38-4
SOT162-1
SOT266-1
4.1 Ordering options
Table 2. Ordering options
Type number Orderable
part number
Package Packing method
PCF8574P
PCF8574P,112
DIP16
PCF8574AP PCF8574AP,112 DIP16
PCF8574T/3 PCF8574T/3,512 SO16
PCF8574T/3,518 SO16
PCF8574AT/3 PCF8574AT/3,512 SO16
PCF8574AT/3,518 SO16
Standard marking
* IC’s tube - DSC bulk pack
Standard marking
* IC’s tube - DSC bulk pack
Standard marking
* tube dry pack
Reel 13” Q1/T1
*standard mark SMD dry pack
Standard marking
* tube dry pack
Reel 13” Q1/T1
*standard mark SMD dry pack
Minimum
order
quantity
1000
Temperature range
Tamb = 40 C to +85 C
1000
Tamb = 40 C to +85 C
1920
Tamb = 40 C to +85 C
1000
Tamb = 40 C to +85 C
1920
Tamb = 40 C to +85 C
1000
Tamb = 40 C to +85 C
PCF8574_PCF8574A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 5 — 27 May 2013
© NXP B.V. 2013. All rights reserved.
2 of 33


Part Number PCF8574
Description Remote 8-bit I/O expander
Maker NXP
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PCF8574 Datasheet PDF





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