CAT9557 Datasheet, PDF (4/17 Pages) ON Semiconductor – 8-Bit I2C-Bus and SMBus I/O Port

Data from
Shift Register
Data from
Shift Register
Write Configuration
Pulse
Configuration
Register
DQ
FF
CK Q
Write Pulse
Read Pulse
Data from
Shift Register
Write Polarity
Pulse
CAT9557
Q1
DQ
FF
CK
Q2
Output Port
Register
Input Port
Register
DQ
FF
CK
Polarity Inversion
Register
DQ
FF
CK
Output Port
Register Data
V_DD
IO1 to IO7
ESD Protection
Diode
V_SS
Input Port
Register Data
Polarity Inversion
Register Data
On power−up or reset, all registers return to default values.
Figure 4. Simplified Schematic of IO1 to IO7
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameters
Ratings
Units
V_DD with Respect to Ground
Voltage on Any Input Pin with Respect to Ground
−0.5 to +6
V
−0.5 to +5.5
V
DC Output Current on I/O₁ to I/O₇ pins (V_o = 0 to V_DD)
DC Output Current on I/O₀ pin (V_o = 0 to V_DD)
DC Output Current on I/O₀ to I/O₇ pins (VI < 0)
DC Input Current (VI < 0)
±50
mA
+50
mA
−20
mA
−20
mA
DC Input Current on I/O₁ to I/O₇ pins (VI < 0 or VI > V_DD)
±20
mA
DC Input Current on I/O₀ pin (VI < 0)
−20
mA
V_DD Supply Current
85
mA
V_SS Supply Current
100
mA
Package Power Dissipation Capability (T_A = 25°C)
1.0
W
Junction Temperature
+150
°C
Storage Temperature
−65 to +150
°C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
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