PCA9556 Philips Semiconductors, PCA9556 Datasheet - Page 2

• Manufacturer Part Number: PCA9556
• Description: Octal SMBus Registered Interface
• Manufacturer: Philips Semiconductors

Philips Semiconductors
FEATURES
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 their active
HIGH polarity inversion bits. Finally, the SMBus system master can
enable the PCA9556’s I/Os as either inputs or outputs by writing to
their I/O configuration bits.
The power-on reset sets the registers to their default values and
initializes the SMBus state machine. The RESET pin causes the
same reset/initialization to occur without depowering the part.
ORDERING INFORMATION
1998 Dec 18
SMBus compliance with fixed 3.3V voltage levels
Operating power supply voltage range of 3.0V – 3.6V
Active high polarity inverter register
Write protect register
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/O
Octal SMBus Registered Interface
16-Pin Plastic TSSOP16 Type I
PACKAGES
TEMPERATURE RANGE
0 C to +70 C
2
PIN CONFIGURATION
PIN DESCRIPTION
NUMBER
OUTSIDE NORTH AMERICA
PIN
10
12
13
14
15
16
11
1
2
3
4
5
6
7
8
9
PCA9556 PW
SYMBOL
SDA
Figure 1. Pin configuration
SCL
I/O0
I/O1
V
RESET
A0
A1
A2
SS
SDA
SCL
I/O0
I/O1
V
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
V
A0
A1
A2
DD
SS
1
2
3
4
5
6
7
8
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
I/O3
I/O4
I/O5
I/O6
I/O7
External reset (active LOW)
Supply voltage
su01045
16
15
14
13
12
11
10
9
DRAWING NUMBER
V
RESET
I/O7
I/O6
I/O5
I/O4
I/O3
I/O2
DD
Product specification
FUNCTION
SOT403-1
PCA9556
853-2138 20549