PCA9540 Datasheet, PDF (2/10 Pages) NXP Semiconductors – 2-channel I2C multiplexer

Philips Semiconductors
2-channel I²C multiplexer
Product specification
PCA9540
FEATURES
• 1-of-2 bi-directional translating multiplexer
• Channel selection via I²C bus
• 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
DESCRIPTION
The PCA9540 is a 1-of-2 bi-directional translating multiplexer,
controlled via the I²C bus. The SCL/SDA upstream pair fans out to
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_DD
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
PACKAGES
8-Pin Plastic SO
8-Pin Plastic TSSOP
TEMPERATURE RANGE
0°C to +70°C
0°C to +70°C
PIN CONFIGURATION
SCL 1
SDA 2
V_DD 3
SD0 4
8 SC1
7 SD1
6 VSS
5 SC0
SW00491
PIN DESCRIPTION
PIN
NUMBER
SYMBOL
1
SCL
2
SDA
3
V_DD
4
SD0
5
SC0
6
V_SS
7
SD1
8
SC1
FUNCTION
Serial clock line
Serial data line
Supply voltage
Serial data 0
Serial clock 0
Supply ground
Serial data 1
Serial clock 1
ORDER CODE
PCA9540D
PCA9540PW DH
DRAWING NUMBER
SOT96-1
SOT505-1
1999 Dec 15
2
853–2185 22852