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CAT9554AYI-G Datasheet(PDF) 6 Page - ON Semiconductor

Part # CAT9554AYI-G
Description  8-bit I짼C and SMBus I/O Port with Interrupt
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT9554AYI-G Datasheet(HTML) 6 Page - ON Semiconductor

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CAT9554, CAT9554A
Doc. No. MD-9002 Rev. F
6
© 2008 SCILLC. All rights reserved
Characteristics subject to change without notice
PIN DESCRIPTION
SCL: Serial Clock
The serial clock input clocks all data transferred into
or out of the device. The SCL line requires a pull-up
resistor if it is driven by an open drain output.
SDA: Serial Data/Address
The bidirectional serial data/address pin is used to
transfer all data into and out of the device. The SDA
pin is an open drain output and can be wire-ORed
with other open drain or open collector outputs. A pull-
up resistor must be connected from SDA line to VCC.
The value of the pull-up resistor, RP, can be calculated
based on minimum and maximum values from Figure
2 and Figure 3 (see Note).
A0, A1, A2: Device Address Inputs
These inputs are used for extended addressing
capability. The A0, A1, A2 pins should be hardwired to
VCC
or
VSS.
When
hardwired,
up
to
eight
CAT9554/9554As may be addressed on a single bus
system. The levels on these inputs are compared with
corresponding bits, A2, A1, A0, from the slave
address byte.
I/O0 to I/O7: Input / Output Ports
Any of these pins may be configured as input or
output. The simplified schematic of I/O0 to I/O7 is
shown in Figure 4. When an I/O is configured as an
input, the Q1 and Q2 output transistors are off
creating a high impedance input with a weak pull-up
resistor (typical 100k
Ω). If the I/O pin is configured as
an output, the push-pull output stage is enabled. Care
should be taken if an external voltage is applied to an
I/O pin configured as an output due to the low
impedance paths that exist between the pin and either
VCC or VSS.
Figure 2. Minimum RP Value versus
Supply Voltage
Figure 3. Maximum RP Value versus
Bus Capacitance
Note: According to the Fast Mode I²C bus specification, for bus capacitance up to 200pF, the pull up device can
be a resistor. For bus loads between 200pF and 400pF, the pull-up device can be a current source (Imax = 3mA)
or a switched resistor circuit.
IOL = 3mA @ VOLmax
VCC (V)
2
2.5
1.5
1
0.5
0
2
2.4 2.8 3.2 3.6
4
4.4 4.8 5.2 5.6
Fast Mode I²C Bus / tr max - 300ns
8.00
7.00
6.00
5.00
4.00
3.00
2.00
1.00
0.00
50
100
150
200
250
300
350
400
CBUS (pF)


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