PCA9545 Philips Semiconductors, PCA9545 Datasheet - Page 2

• Manufacturer Part Number: PCA9545
• Description: 4-channel I2C switch with interrupt logic and reset
• Manufacturer: Philips Semiconductors

Philips Semiconductors
FEATURES
DESCRIPTION
The PCA9545 is a quad bi-directional translating switch controlled
via the I
downstream pairs, or channels. Any individual SCx/SDx channel or
combination of channels can be selected, determined by the
contents of the programmable control register. Four interrupt inputs,
INT0 to INT3, one for each of the downstream pairs, are provided.
One interrupt output, INT, acts as an AND of the four interrupt
inputs.
An active-LOW reset input allows the PCA9545 to recover from a
situation where one of the downstream I
state. Pulling the RESET pin LOW resets the I
causes all the channels to be deselected as does the internal power
on reset function.
The pass gates of the switches are constructed such that the V
pin can be used to limit the maximum high voltage which will be
ORDERING INFORMATION
Standard packing quantities and other packaging data is available at www.philipslogic.com/packaging.
2002 Mar 28
1-of-4 bi-directional translating switches
I
4 active low interrupt inputs
Active low interrupt output
Active low reset input
2 address pins allowing up to 4 devices on the I
Channel selection via I
Power up with all switch channels deselected
Low RDS
Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V and
5 V buses
No glitch on power-up
Supports hot insertion
Low stand-by current
Operating power supply voltage range of 2.3 V to 5.5 V
5 V tolerant Inputs
0 to 400 kHz clock frequency
ESD protection exceeds 2000 V HBM per JESD22-A114,
150 V MM per JESD22-A115 and 1000 V per JESD22-C101
Latch-up testing is done to JESDEC Standard JESD78 which
exceeds 100 mA
Package Offer: SO20, TSSOP20
4-channel I
2
C interface logic; compatible with SMBus standards
20-Pin Plastic TSSOP
2
C bus. The SCL/SDA upstream pair fans out to four
20-Pin Plastic SO
ON
PACKAGES
switches
2
2
C switch with interrupt logic and reset
C bus, in any combination
2
C buses is stuck in a LOW
TEMPERATURE RANGE
2
C state machine and
–40 to +85 C
–40 to +85 C
2
C bus
DD
2
passed by the PCA9545. This allows the use of different bus
voltages on each pair, so that 1.8 V or 2.5 V or 3.3 V parts can
communicate with 5 V parts without any additional protection.
External pull-up resistors pull the bus up to the desired voltage level
for each channel. All I/O pins are 5 V tolerant.
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
ORDER CODE
PCA9545PW
PCA9545D
SYMBOL
RESET
RESET
Figure 1. Pin configuration
INT0
INT1
INT2
INT3
INT1
SDA
INT0
SD0
SC0
SD1
SC1
SD2
SC2
SD3
SC3
SCL
V
SD1
VSS
V
SD0
SC0
SC1
INT
A0
A1
A0
A1
SS
DD
10
1
2
3
4
5
6
8
9
7
Address input 0
Address input 1
Active low reset input
Active low interrupt input 0
Serial data 0
Serial clock 0
Active low interrupt input 1
Serial data 1
Serial clock 1
Supply ground
Active low interrupt input 2
Serial data 2
Serial clock 2
Active low interrupt input 3
Serial data 3
Serial clock 3
Active low interrupt output
Serial clock line
Serial data line
Supply voltage
SW00762
20
19
18
17
16
15
14
13
12
11
DRAWING NUMBER
V
SDA
SCL
INT
SC3
SD3
INT3
SC2
SD2
INT2
DD
FUNCTION
SOT163-1
SOT360-1
PCA9545
853-2302 27940
Product data