Description
PCA9518PW,118 NXP I/O Expander I2C Buffer 3.3V 300mW 20-Pin TSSOP T/R RoHS
Specifications
Manufacturer: NXP
Product Category: Interface – I/O Expanders
Maximum Clock Frequency: 400 kHz
Operating Supply Voltage: 3 V to 3.6 V
Minimum Operating Temperature: – 40 C
Maximum Operating Temperature: + 85 C
Mounting Style: SMD/SMT
Package / Case: TSSOP-20
Packaging: Reel
Packaging: Cut Tape
Brand: NXP Semiconductors
Input Voltage: 5 V
Logic Family: PCA9518
Logic Type: I2C Bus
Output Voltage: 5 V
Pd – Power Dissipation: 300 mW
Product Type: I/O Expanders
Pack Quantity:2500
Subcategory: Interface ICs
Part # Aliases: 935272403118
Unit Weight: 0.003370 oz
The PCA9518 is a BiCMOS integrated circuit intended for application in IC-bus and SMBus systems. While retaining all the operating modes and features of the IC-bus system, it permits extension of the IC-bus by buffering both the data (SDA) and the clock (SCL) lines, thus enabling virtually an unlimited number of buses of 400 pF. The IC-bus capacitance limit of 400 pF restricts the number of devices and bus length. Using the PCA9518 enables the system designer to divide the bus into an unlimited number of segments off of a hub where any segment to segment transition sees only one repeater delay and is multiple master capable on each segment. Using multiple PCA9518 parts, any width hub (in multiples of five)1can be implemented using the expansion pins. The PCA9518 is a wider voltage range (2.3 V to 3.6 V) version of the PCA9518 and also improves partial power-down performance, keeping IC-bus I/O pins in high-impedance state when VDD is below 2.0 V. A PCA9518 cluster cannot be put in series with a PCA9515/16 or with another PCA9518 cluster. Multiple PCA9518 devices can be grouped with other PCA9518 devices into any size cluster thanks to the EXPxxxn pins that allow the IC-bus signals to be sent/received from/to one PCA9518 to/from another PCA9518 within the cluster. Since there is no direction pin, slightly different ‘egal’ low voltage levels are used to avoid lock-up conditions between the input and the output of individual repeaters in the cluster. A ‘regular LOW’ applied at the input of any of the PCA9518 devices will then be propagated as a ‘buffered LOW’ with a slightly higher value to all enabled outputs in the PCA9518 cluster. When this ‘buffered LOW’ is applied to a PCA9515 and PCA9516 or separate PCA9518 cluster (not connected via the EXPxxxn pins) in series, the second PCA9515 and PCA9516 or PCA9518 cluster will not recognize it as a ‘regular LOW’ and will not propagate it as a ‘buffered LOW’ again. The PCA9510/9511/9513/9514 and PCA9512 cannot be used in series with the PCA9515 and PCA9516 or PCA9518, but can be used in series with themselves since they use shifting instead of static offsets to avoid lock-up conditions.
Manufacturer: NXP
MFG Part #: PCA9518PW,118
