Philips Semiconductors
Product data
8-bit I
2
C and SMBus I/0 port with reset
PCA9557
•
Low standby current
•
Operating power supply voltage range of 2.3 V to 5.5 V
•
5 V tolerant inputs/outputs
•
0 to 400 kHz clock frequency
•
ESD protection exceeds 2000 V HBM per JESD22-A114,
•
Latch-up testing is done to JESDEC Standard JESD78 which
FEATURES
PCA9556
200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
exceeds 100 mA
•
Lower voltage, higher performance migration path for the
•
8 general purpose input/output expander/collector
•
Input/output configuration register
•
Active HIGH polarity inversion register
•
I
2
C and SMBus interface logic
•
Internal power-on reset
•
Noise filter on SCL/SDA inputs
•
Active LOW reset input
•
3 address pins allowing up to 8 devices on the I
2
C/SMBus
•
High impedance open drain on I/O0
•
No glitch on power-up
•
Power-up with all channels configured as inputs
•
Three packages offered: SO16, TSSOP16, HVQFN16
DESCRIPTION
The PCA9557 is a silicon CMOS circuit which provides parallel
input/output expansion for SMBus and I
2
C applications. The
PCA9557 consists of an 8-bit input port register, 8-bit output port
register, and an I
2
C/SMBus interface. It has low current
consumption and a high impedance open drain output pin, I/O0.
The system master can enable the PCA9557’s I/O as either input or
output by writing to the configuration register.
The system master can also invert the PCA9557 inputs by writing to
the active HIGH polarity inversion register.
Finally, the system master can reset the PCA9557 in the event of a
timeout by asserting a LOW in the reset input.
The power-on reset puts the registers in their default state and
initializes the I
2
C/SMBus state machine. The RESET pin causes the
same reset/initialization to occur without depowering the part.
ORDERING INFORMATION
PACKAGES
16-Pin Plastic SO (narrow)
16-Pin Plastic TSSOP
TEMPERATURE RANGE
-40 to +85
°C
-40 to +85
°C
ORDER CODE
PCA9557D
PCA9557PW
DRAWING NUMBER
SOT109-1
SOT403-1
SOT629-1
16-Pin Plastic HVQFN
-40 to +85
°C
PCA9557BS
Standard packing quantities and other packaging data are available at www.philipslogic.com/packaging.
SMBus as specified by the Smart Battery System Implementers Forum is a derivative of the Philips I
2
C patent.
I
2
C is a trademark of Philips Semiconductors Corporation.
2002 Dec 13
2
853-2308 28188