PCA9544 Philips Semiconductors, PCA9544 Datasheet - Page 2

• Manufacturer Part Number: PCA9544
• Description: 4-channel I2C multiplexer and interrupt controller
• Manufacturer: Philips Semiconductors

Philips Semiconductors
FEATURES
DESCRIPTION
The PCA9544 is a 1-of-4 bi-directional translating multiplexer,
controlled via the I
four 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. Four interrupt inputs, one for each of
the SCx/SDx downstream pair, are provided. One interrupt output,
which acts as an AND of the four interrupt inputs, is provided. All I/O
pins are 5 V tolerant.
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 PCA9544. 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 Oct 07
1-of-4 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
3 address pins, allowing up to 8 devices on the I
Low on resistance
4-channel I
20-Pin Plastic TSSOP
PACKAGES
2
C bus. The SCL/SDA upstream pair fans out to
2
2
C multiplexer and interrupt controller
C bus
TEMPERATURE RANGE
0 C to +70 C
2
C bus
DD
2
PIN CONFIGURATION
PIN DESCRIPTION
NUMBER
PIN
10
12
13
14
15
16
17
18
19
20
11
1
2
3
4
5
6
7
8
9
PCA9544 PW DH
ORDER CODE
SYMBOL
INT0
INT1
INT2
INT3
INT1
VSS
SDA
INT0
SD0
SC0
SD1
SC1
SD2
SC2
SD3
SC3
SCL
V
SD1
VSS
SD0
SC0
SC1
INT
A0
A1
A2
A0
A1
A2
DD
10
1
2
3
4
5
6
8
9
7
Address input 0
Address input 1
Address input 2
Interrupt input 0
Serial data 0
Serial clock 0
Interrupt input 1
Serial data 1
Serial clock 1
Supply ground
Interrupt input 2
Serial data 2
Serial clock 2
Interrupt input 3
Serial data 3
Serial clock 3
Interrupt output
Serial clock line
Serial data line
Supply voltage
SW00373
20
19
18
17
16
15
14
13
12
11
DRAWING NUMBER
V
SDA
SCL
INT
SC3
SD3
INT3
SC2
SD2
INT2
DD
FUNCTION
Product specification
SOT360-1
PCA9544
853–2178 22487