pca9540b NXP Semiconductors, pca9540b Datasheet - Page 2

• Manufacturer Part Number: pca9540b
• Description: 2-channel I2c Multiplexer
• Manufacturer: NXP Semiconductors

Philips Semiconductors
FEATURES
DESCRIPTION
The PCA9540B 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.
A power-on reset function puts the registers in their default state and
initializes the I
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 PCA9540B. This allows the use of different bus
voltages on each SCx/SDx pair, so that 1.8 V, 2.5, or 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. All I/O pins are 5 V tolerant.
The PCA9540B has replaced the PCA9540 and all designs must
migrate to the PCA9540B. PCA9540B samples can be requested
from www.philipslogic.com/products/I2Cmuxes/.
ORDERING INFORMATION
Standard packing quantities and other packaging data are available at www.standardproducts.philips.com/packaging.
2004 Sep 29
1-of-2 bi-directional translating multiplexer
I
Channel selection via I
Power up with all multiplexer 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,
200 V MM per JESD22-A115 and 1000 V per JESD22-C101
Latch-up testing is done to JESDEC Standard JESD78 which
exceeds 100 mA
Packages Offered: SO8, TSSOP8
2-channel I
2
C interface logic; compatible with SMBus standards
8-Pin Plastic TSSOP
8-Pin Plastic SO
PACKAGES
ON
2
switches
C state machine with no channels selected.
2
C-bus. The SCL/SDA upstream pair fans out to
2
2
C multiplexer
C-bus
TEMPERATURE RANGE
–40 C to +85 C
–40 C to +85 C
ORDER CODE
PCA9540BDP
DD
PCA9540BD
2
PIN CONFIGURATION
PIN DESCRIPTION
NUMBER
PIN
1
2
3
4
5
6
7
8
SYMBOL
TOPSIDE MARK
SCL
SDA
SD0
SC0
SD1
SC1
V
V
Figure 1. Pin configuration
DD
SS
PA9540B
SDA
SD0
V
SCL
9540B
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
FUNCTION
8
7
6
5
DRAWING NUMBER
SC1
SD1
V
SC0
PCA9540B
SS
SOT505-1
Product data sheet
SOT96-1