Philips Semiconductors
Product data
Octal SMBus and I
2
C registered interface
PCA9556
The power-on reset puts the registers in their default state and
initializes the SMBus state machine. The RESET pin causes the
same reset/initialization to occur without depowering the part.
The PCA9557 8-bit I
2
C SMBus I/O port with reset is the higher
performance pin-for-pin replacement for the PCA9556.
PIN CONFIGURATION
SCL 1
SDA
2
16 V
DD
15 RESET
14 I/O7
13 I/O6
12 I/O5
11 I/O4
10 I/O3
9
I/O2
FEATURES
•
SMBus compliance with fixed 3.3V voltage levels
•
Operating power supply voltage range of 3.0 V – 5.5 V
•
Active high polarity inverter register
•
Each I/O is configurable as an input or output
•
Active low reset pin
•
Low leakage current on power-down
•
Noise filter on SCL/SDA inputs
•
No glitch on power-up
•
Internal power-on reset
•
8 I/O pins which default to 8 inputs
•
High impedance open drain on I/O0
•
ESD protection exceeds 2000 V HBM per JESD22-A114,
200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
A0 3
A1 4
A2 5
I/O0 6
I/O1 7
V
SS
8
su01045
Figure 1. Pin configuration
PIN DESCRIPTION
PIN
NUMBER
1
2
3
4
5
6
7
8
9–14
15
16
SYMBOL
SCL
SDA
A0
A1
A2
I/O0
I/O1
V
SS
I/O2–I/O7
RESET
V
DD
FUNCTION
Serial clock line
Serial data line
Address input 0
Address input 1
Address input 2
I/O0 (open drain)
I/O1
Supply GROUND
I/O2 to I/O7
External reset (active LOW)
Supply voltage
•
Latch-up testing is done to JESDEC Standard JESD78 which
exceeds 100 mA
DESCRIPTION
The PCA9556 is a silicon CMOS circuit which provides parallel
input/output expansion for SMBus applications. The PCA9556
consists of an 8-bit input port register, 8-bit output port register, and
an SMBus interface. It has low current consumption and a high
impedance open drain output pin, I/O0.
The SMBus system master can reset the PCA9556 in the event of a
timeout by asserting a LOW on the reset input. The SMBus system
master can also invert the PCA9556 inputs by writing to the active
HIGH polarity inversion bits. Finally, the system master can enable
the PCA9556’s I/Os as either inputs or outputs by writing to the
configuration register.
ORDERING INFORMATION
PACKAGES
16-Pin Plastic TSSOP
TEMPERATURE RANGE
–40 to +85
°C
ORDER CODE
PCA9556PW
DRAWING NUMBER
SOT403-1
Standard packing quantities and other packaging data is 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 Mar 28
2
853-2138 27929
PHILIPS [ NXP SEMICONDUCTORS ]
