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PCA9557 Datasheet(PDF) 3 Page - NXP Semiconductors

Part No. PCA9557
Description  8-bit I2C and SMBus I/0 port with reset
Download  16 Pages
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

PCA9557 Datasheet(HTML) 3 Page - NXP Semiconductors

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Philips Semiconductors
Product data
PCA9557
8-bit I2C and SMBus I/0 port with reset
2001 Dec 12
3
BLOCK DIAGRAM
POWER-ON
RESET
INPUT
FILTER
I2C/SMBus
CONTROL
INPUT/
OUTPUT
PORTS
WRITE pulse
READ pulse
A0
A1
A2
SCL
SDA
VDD
VSS
8-BIT
I/O0
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
SW00827
RESET
PCA9557
Figure 2. Block diagram
SYSTEM DIAGRAM
SW00794
I/O0
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7
6
7
9
10
11
12
13
14
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
Input Port
Polarity Inversion
Configuration
Output Port
RESET
SCL
SDA
A2
A1
A0
15
1
2
5
4
3
VCC= 16
GND = 8
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
I2C/SMBus
Interface
logic
or
or
or
1.1 K
1.1 K
1.6 K
1.6 K
1.1 K
1.1 K
1.1 K
Figure 3. System diagram


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