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Details, datasheet, quote on part number:PCA9540DP
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Datasheet text preview:
INTEGRATED CIRCUITS
PCA9540 2-channel I2C multiplexer
Product data Supersedes data of 2001 Feb 08 2002 May 13
Philips Semiconductors
Philips Semiconductors
Product data
2-channel I2C multiplexer
PCA9540
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
PIN CONFIGURATION
SCL SDA VDD SD0
1 2 3 4
8 7 6 5
SC1 SD1 V SS SC0
· 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,
100 V MM per JESD22-A115 and 1000 V per JESD22-C101
SW00491
Figure 1. Pin configuration
PIN DESCRIPTION
PIN NUMBER 1 2 3 4 5 6 7 8 SYMBOL SCL SDA VDD SD0 SC0 VSS SD1 SC1 FUNCTION Serial clock line Serial data line Supply voltage Serial data 0 Serial clock 0 Supply ground Serial data 1 Serial clock 1
· Latch-up testing is done to JESDEC Standard JESD78 which
exceeds 100 mA
· Package Offer:
SO8, TSSOP8
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. 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 PCA9540. 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.
ORDERING INFORMATION
PACKAGES 8-Pin Plastic SO TEMPERATURE RANGE 40 to +85 °C ORDER CODE PCA9540D DRAWING NUMBER SOT96-1 SOT505-1
8-Pin Plastic TSSOP 40 to +85 °C PCA9540DP Standard packing quantities and other packaging data is available at www.philipslogic.com/packaging.
2002 May 13
2
8532185 28186
Philips Semiconductors
Product data
2-channel I2C multiplexer
PCA9540
BLOCK DIAGRAM
PCA9540
SC0
SC1
SD0
SD1
SWITCH CONTROL LOGIC V SS
VDD
Power-on Reset
SCL Input Filter SDA I2C-Bus Control
SW00834
Figure 2. Block diagram
2002 May 13
3
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