参数资料
| 型号： | CAT9555YI-T2 |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER I2C 16B 24TSSOP |
| 标准包装： | 1 |
| 接口： | I²C，串行，SMBus |
| 输入/输出数： | 16 |
| 中断输出： | 是 |
| 频率 - 时钟： | 400kHz |
| 电源电压： | 2.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 24-TSSOP |
| 包装： | 标准包装 |
| 包括： | POR |
| 产品目录页面： | 807 (CN2011-ZH PDF) |
| 其它名称： | CAT9555YI-T2DKR |
CAT9555
http://onsemi.com
6
Pin Description
SCL: Serial Clock
The serial clock input clocks all data transferred into or out
of the device. The SCL line requires a pullup 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 wireORed with other open drain or
open collector outputs. A pullup resistor must be connected
from SDA line to VCC. The value of the pullup resistor, RP,
can be calculated based on minimum and maximum values
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 CAT9555s 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/O0.0 to I/O0.7, I/O1.0 to I/O1.7: 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 6. 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 pullup resistor (typical 100 k
W). If the I/O pin
is configured as an output, the pushpull 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 4. Minimum RP as a Function of
Supply Voltage
Figure 5. Maximum RP Value vs.
Bus Capacitance
VCC (V)
CBUS (pF)
4.8
4.4
4.0
3.6
3.2
2.8
2.4
2.0
0
0.5
1.0
1.5
2.0
2.5
400
350
300
200
150
100
50
0
1
2
3
4
6
7
8
R
Pmin
(K
W
)
R
Pmax
(K
W
)
5.2
5.6
IOL = 3 mA @ VOLmax
250
5
Fast Mode I2C Bus /
tr max 300 ns
NOTE: According to the Fast Mode I2C bus specification, for bus capacitance up to 200 pF, the pull up device can be a resistor. For bus
loads between 200 pF and 400 pF, the pullup device can be a current source (Imax = 3 mA) or a switched resistor circuit.
相关PDF资料 |
PDF描述 |
|---|---|
| 616-220-311 | UNIGUIDE 9" X .205" GREY |
| PCA9671D,118 | IC I/O EXPANDER I2C 16B 24SOIC |
| 616-220-310 | UNIGUIDE 9" X .141" GREY |
| 3448-58 | STRAIN RELIEF 50 POS |
| 3448-56 | STRAIN RELIEF 34 POS |
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