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PCA9540B Datasheet

2-channel I2C multiplexer

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INTEGRATED CIRCUITS
PCA9540B
2-channel I2C multiplexer
Product data sheet
Supersedes data of 2004 Apr 13
2004 Sep 29
Philips
Semiconductors


NXP Semiconductors Electronic Components Datasheet

PCA9540B Datasheet

2-channel I2C multiplexer

No Preview Available !

Philips Semiconductors
2-channel I2C multiplexer
Product data sheet
PCA9540B
FEATURES
1-of-2 bi-directional translating multiplexer
I2C interface logic; compatible with SMBus standards
Channel selection via I2C-bus
Power up with all multiplexer channels deselected
Low RdsON switches
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
DESCRIPTION
The PCA9540B 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.
A power-on reset function puts the registers in their default state and
initializes the I2C state machine with no channels selected.
The pass gates of the multiplexer are constructed such that the VDD
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/.
PIN CONFIGURATION
SCL 1
SDA 2
VDD 3
SD0 4
8 SC1
7 SD1
6 VSS
5 SC0
SW00491
Figure 1. Pin configuration
PIN DESCRIPTION
PIN
NUMBER
SYMBOL
1 SCL
2 SDA
3 VDD
4 SD0
5 SC0
6 VSS
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
ORDERING INFORMATION
PACKAGES
TEMPERATURE RANGE
ORDER CODE
TOPSIDE MARK
DRAWING NUMBER
8-Pin Plastic SO
–40 °C to +85 °C
PCA9540BD
PA9540B
SOT96-1
8-Pin Plastic TSSOP
–40 °C to +85 °C
PCA9540BDP
9540B
Standard packing quantities and other packaging data are available at www.standardproducts.philips.com/packaging.
SOT505-1
2004 Sep 29
2


Part Number PCA9540B
Description 2-channel I2C multiplexer
Maker NXP
Total Page 14 Pages
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