Philips pca9540 DATASHEETS
INTEGRATED CIRCUITS
PCA9540
2
2-channel I
Product specification
Supersedes data of 2000 Jun 19
C multiplexer
2000 Oct 12
Philips Semiconductors Product specification
PCA95402-channel I2C multiplexer
FEA TURES
•1-of-2 bi-directional translating multiplexer
•Channel selection via I
2
C bus
•Operating supply voltage 2.5 to 3.6 V
•Operating temperature range –40°C to +85°C
•Power-up with all multiplexer channels deselected
•Low on resistance
DESCRIPTION
The PCA9540 is a 1-of-2 bi-directional translating multiplexer,
controlled via the I
two SCx/SDx downstream pairs, or channels. Only one SCx/SDx
channel is selected at a time, determined by the contents of the
programmable control register.
The pass gates of the multiplexer are constructed such that the V
pin can be used to limit the maximum high voltage which will be
passed by the PCA9540. This allows the use of different bus
voltages on each SCx/SDx pair, so that 3.3 V parts can
communicate with 5 V parts without any additional protection.
External pull-up resistors can pull the bus up to the desired voltage
level for this channel.
2
C bus. The SCL/SDA upstream pair fans out to
DD
PIN CONFIGURATION
1
2
SDA
3
V
DD
45
SD0
PIN DESCRIPTION
PIN
NUMBER
1 SCL Serial clock line
2 SDA Serial data line
3 V
4 SD0 Serial data 0
5 SC0 Serial clock 0
6 V
7 SD1 Serial data 1
8 SC1 Serial clock 1
SYMBOL FUNCTION
DD
SS
Supply voltage
Supply ground
8SCL
7
6
SW00491
SC1
SD1
V
SC0
SS
ORDERING INFORMATION
PACKAGES TEMPERATURE RANGE ORDER CODE DRAWING NUMBER
8-Pin Plastic SO –40°C to +85°C PCA9540D SOT96-1
8-Pin Plastic TSSOP –40°C to +85°C PCA9540DP SOT505-1
2000 Oct 12 853–2185 24797
2
Philips Semiconductors Product specification
PCA95402-channel I2C multiplexer
BLOCK DIAGRAM
SC0
SC1
SD0
SD1
V
SS
V
SCL
SDA
DD
Power-on
Reset
Input
Filter
2
I
C-Bus
Control
SW00492
2000 Oct 12
3
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