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PCA8574APW-PCA8574PW-PCA8574TS
Remote 8-bit I/O expander for I虏C-bus with interrupt
1. General descriptionThe PCA8574/74A provides general-purpose remote I/O expansion via the two-wire
bidirectional I2 C-bus (serial clock (SCL), serial data (SDA)).
The devices consist of eight quasi-bidirectional ports, 400 kHz I2 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
same I2 C-bus, so there can be up to 16 of these I/O expanders PCA8574/74A together on
the same I2 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
polling the input register via the I2 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 benefitsI2 C-bus to parallel port expander 400 kHz I2 C-bus interface (Fast-mode I2 C-bus) Operating supply voltage 2.3 V to 5.5 V with 5.5 V tolerant I/Os held to VDD with
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 operation
PCA8574; PCA8574A
Remote 8-bit I/O expander for I2 C-bus with interrupt
Rev. 3 — 3 June 2013 Product data sheet
NXP Semiconductors PCA8574; PCA8574A
Remote 8-bit I/O expander for I2 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[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.
Table 1. Ordering informationPCA8574D[1] PCA8574D SO16 plastic small outline package; 16 leads; body width 7.5 mm SOT162-1
PCA8574AD[2] PCA8574AD
PCA8574PW PCA8574 TSSOP16 plastic thin shrink small outline package; 16 leads;
body width 4.4 mm
SOT403-1
PCA8574APW PA8574A
PCA8574TS[3] PCA8574 SSOP20 plastic shrink small outline package; 20 leads;
body width 4.4 mm
SOT266-1
PCA8574ATS[4] PA8574A
NXP Semiconductors PCA8574; PCA8574A
Remote 8-bit I/O expander for I2 C-bus with interrupt
4.1 Ordering options
5. Block diagram
Table 2. Ordering optionsPCA8574D PCA8574D,512 SO16 Standard marking * tube dry pack 1920 Tamb= 40 C to +85C
PCA8574D,518 SO16 Reel 13” Q1/T1
*standard mark SMD dry pack
1000 Tamb= 40 C to +85C
PCA8574AD PCA8574AD,512 SO16 Standard marking * tube dry pack 1920 Tamb= 40 C to +85C
PCA8574AD,518 SO16 Reel 13” Q1/T1
*standard mark SMD dry pack
1000 Tamb= 40 C to +85C
PCA8574PW PCA8574PW,112 TSSOP16 Standard marking
* IC’s tube - DSC bulk pack
2400 Tamb= 40 C to +85C
PCA8574PW,118 TSSOP16 Reel 13” Q1/T1
*standard mark SMD
2500 Tamb= 40 C to +85C
PCA8574APW PCA8574APW,112 TSSOP16 Standard marking
* IC’s tube - DSC bulk pack
2400 Tamb= 40 C to +85C
PCA8574APW,118 TSSOP16 Reel 13” Q1/T1
*standard mark SMD
2500 Tamb= 40 C to +85C
PCA8574TS PCA8574TS,112 SSOP20 Standard marking
* IC’s tube - DSC bulk pack
1350 Tamb= 40 C to +85C
PCA8574TS,118 SSOP20 Reel 13” Q1/T1
*standard mark SMD
2500 Tamb= 40 C to +85C
PCA8574ATS PCA8574ATS,112 SSOP20 Standard marking
* IC’s tube - DSC bulk pack
1350 Tamb= 40 C to +85C
PCA8574ATS,118 SSOP20 Reel 13” Q1/T1
*standard mark SMD
2500 Tamb= 40 C to +85C
NXP Semiconductors PCA8574; PCA8574A
Remote 8-bit I/O expander for I2 C-bus with interrupt
6. Pinning information
6.1 Pinning
NXP Semiconductors PCA8574; PCA8574A
Remote 8-bit I/O expander for I2 C-bus with interrupt
6.2 Pin description
7. Functional descriptionRefer to Figure 1 “Block diagram”.
7.1 Device addressFollowing a START condition, the bus master must send the address of the slave it is
accessing and the operation it wants to perform (read or write). The address format of the
PCA8574/74A is shown in Figure 6. Slave address pins A2, A1 and A0 are held HIGH or
LOW to choose one of eight slave addresses. To conserve power, no internal pull-up
resistors are incorporated on pins A2, A1, or A0 so they must be externally held HIGH or
LOW. The address pins (A2, A1, A0) can connect to VDD or VSS directly or through
resistors.
Table 3. Pin description 1 6 address input 0 2 7 address input 1 3 9 address input 2 4 10 quasi-bidirectional I/O0 5 11 quasi-bidirectional I/O1 6 12 quasi-bidirectional I/O2 7 14 quasi-bidirectional I/O3
VSS 8 15 supply ground 9 16 quasi-bidirectional I/O4 10 17 quasi-bidirectional I/O5 11 19 quasi-bidirectional I/O6 12 20 quasi-bidirectional I/O7
INT 13 1 interrupt output (active LOW)
SCL 14 2 serial clock line
SDA 15 4 serial data line
VDD 16 5 supply voltage
n.c. - 3, 8, 13, 18 not connected
