PCA9540 Philips Semiconductors, PCA9540 Datasheet - Page 2

• Manufacturer Part Number: PCA9540
• Description: 2-channel I2C multiplexer
• Manufacturer: Philips Semiconductors

Philips Semiconductors
FEATURES
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.
ORDERING INFORMATION
1999 Dec 15
1-of-2 bi-directional translating multiplexer
Channel selection via I
Operating supply voltage 2.5 to 3.6 V
Operating temperature range 0 C to 70 C
Power-up with all multiplexer channels deselected
Low on resistance
2-channel I
8-Pin Plastic TSSOP
8-Pin Plastic SO
PACKAGES
2
C bus. The SCL/SDA upstream pair fans out to
2
2
C multiplexer
C bus
TEMPERATURE RANGE
0 C to +70 C
0 C to +70 C
DD
2
PIN CONFIGURATION
PIN DESCRIPTION
NUMBER
PIN
1
2
3
4
5
6
7
8
PCA9540PW DH
ORDER CODE
PCA9540D
SYMBOL
SCL
SDA
SD0
SC0
SD1
SC1
V
V
DD
SS
SDA
SD0
V
SCL
DD
1
2
3
4
Serial clock line
Serial data line
Supply voltage
Serial data 0
Serial clock 0
Supply ground
Serial data 1
Serial clock 1
SW00491
DRAWING NUMBER
FUNCTION
8
7
6
5
SC1
SD1
V
SC0
Product specification
SS
SOT505-1
SOT96-1
PCA9540
853–2185 22852