Datasheet

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APPLICATION INFORMATION
PCA9545A
SD1
SDA
SCL
SDA
Channel 0
Channel 1
Channel 2
Channel 3
See Note A
I
2
C/SMBus
Master
SCL
INT
RESET
INT1
SC1
SD2
SC2
SD3
SC3
INT2
INT3
SD0
INT0
SC0
V
CC
= 2.7 V to 5.5 V
V
CC
= 3.3 V
V
CC
= 2.7 V to 5.5 V
V
CC
= 2.7 V to 5.5 V
V
CC
= 2.7 V to 5.5 V
V
CC
= 2.7 V to 5.5 V
See Note A
See Note A
See Note A
19
18
17
3
20
5
6
4
8
9
7
12
13
11
15
16
14
2
1
10
A1
A0
GND
PCA9545A
4-CHANNEL I
2
C AND SMBus SWITCH
WITH INTERRUPT LOGIC AND RESET FUNCTIONS
SCPS147C – OCTOBER 2005 – REVISED OCTOBER 2006
Figure 13 shows an application in which the PCA9545A can be used.
A. If the device generating the interrupt has an open-drain output structure or can be 3-stated, a pullup resistor is
required. If the device generating the interrupt has a totem-pole output structure and cannot be 3-stated, a pullup
resistor is not required. The interrupt inputs should not be left floating.
B. Pin numbers shown are for DGV, DW, PW, and RGY packages.
Figure 13. Typical Application
16
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