Datasheet
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DESCRIPTION/ORDERING INFORMATION (CONTINUED)
D, DGV, DW, OR PW PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
A0
A1
RESET
SD0
SC0
SD1
SC1
GND
V
CC
SDA
SCL
A2
SC3
SD3
SC2
SD2
RGY PACKAGE
(TOP VIEW)
2
15
SDAA1
3
14
SCL
RESET
4
13
A2SD0
5
12
SC3SC0
6
11
SD3SD1
7
10
SC2SC1
1
8
A0
GND
16
9
SD2
V
CC
RGV PACKAGE
(TOP VIEW)
8
SC2
13
SD
A
16
5
A1
SC1
6
15
A0
GND
V
CC
7
14
SD2
1 12
SCL
RESET
2 11
A2SD0
10
SC3
3
SC0
4
9
SD3SD1
PCA9546A
4-CHANNEL I
2
C AND SMBus SWITCH
WITH RESET FUNCTION
SCPS148E – OCTOBER 2005 – REVISED JANUARY 2008
The pass gates of the switches are constructed such that the V
CC
pin can be used to limit the maximum high
voltage, which will be passed by the PCA9546A. This allows the use of different bus voltages on each pair, so
that 1.8-V, 2.5-V, or 3.3-V parts can communicate with 5-V parts without any additional protection. External
pullup resistors pull the bus up to the desired voltage level for each channel. All I/O pins are 5.5-V tolerant.
TERMINAL FUNCTIONS
NO.
NAME DESCRIPTION
D, DGV, DW, PW,
RGV
AND RGY
1 15 A0 Address input 0. Connect directly to V
CC
or ground.
2 16 A1 Address input 1. Connect directly to V
CC
or ground.
3 1 RESET Active low reset input. Connect to V
CC
through a pullup resistor, if not used.
4 2 SD0 Serial data 0. Connect to V
CC
through a pullup resistor.
5 3 SC0 Serial clock 0. Connect to V
CC
through a pullup resistor.
6 4 SD1 Serial data 1. Connect to V
CC
through a pullup resistor.
7 5 SC1 Serial clock 1. Connect to V
CC
through a pullup resistor.
8 6 GND Ground
9 7 SD2 Serial data 2. Connect to V
CC
through a pullup resistor.
10 8 SC2 Serial clock 2. Connect to V
CC
through a pullup resistor.
11 9 SD3 Serial data 3. Connect to V
CC
through a pullup resistor.
12 10 SC3 Serial clock 3. Connect to V
CC
through a pullup resistor.
13 11 A2 Address input 2. Connect directly to V
CC
or ground.
14 12 SCL Serial clock line. Connect to V
CC
through a pullup resistor.
15 13 SDA Serial data line. Connect to V
CC
through a pullup resistor.
16 14 V
CC
Supply power
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