PCA9515ATP: I²C-bus repeater

The PCA9515A is a CMOS integrated circuit intended for application in I²C-bus and SMBus systems.

While retaining all the operating modes and features of the I²C-bus system, it permits extension of the I²C-bus by buffering both the data (SDA) and the clock (SCL) lines, thus enabling two buses of 400 pF.

The I²C-bus capacitance limit of 400 pF restricts the number of devices and bus length. Using the PCA9515A enables the system designer to isolate two halves of a bus, thus more devices or longer length can be accommodated. It can also be used to run two buses, one at 5 V and the other at 3.3 V or a 400 kHz and 100 kHz bus, where the 100 kHz bus is isolated when 400 kHz operation of the other is required.

Two or more PCA9515As cannot be put in series . The PCA9515A design does not allow this configuration. Since there is no direction pin, slightly different 'legal' low voltage levels are used to avoid lock-up conditions between the input and the output. A 'regular LOW' applied at the input of a PCA9515A will be propagated as a 'buffered LOW' with a slightly higher value. When this 'buffered LOW' is applied to another PCA9515A, PCA9516A or PCA9518/A in series, the second PCA9515A, PCA9516A or PCA9518/A will not recognize it as a 'regular LOW' and will not propagate it as a 'buffered LOW' again. The PCA9510/A, PCA9511/A, PCA9512/A, PCA9513/A, PCA9514/A cannot be used in series with the PCA9515A, PCA9516A or PCA9518/A, but can be used in series with themselves since they use shifting instead of static offsets to avoid lock-up conditions.

The output pull-down of each internal buffer is set for approximately 0.5 V, while the input threshold of each internal buffer is set about 0.07 V lower, when the output is internally driven LOW. This prevents a lock-up condition from occurring.

sot1069-2_3d
Data Sheets (1)
Name/DescriptionModified Date
I2C-bus repeater (REV 5.0) PDF (217.0 kB) PCA9515A23 Mar 2012
Package Information (1)
Name/DescriptionModified Date
HWSON8: plastic thermal enhanced very very thin small outline package, no leads; 8 terminals; (REV 1.1) PDF (190.0 kB) SOT1069-210 Jun 2016
Packing (1)
Name/DescriptionModified Date
HWSON8; Reel pack, SMD, 7" Q2/T3 Turned 90 degree product orientation Orderable part number ending, 147 or... (REV 1.0) PDF (196.0 kB) SOT1069-2_14706 May 2014
Ordering Information
ProductStatusPackage versionApplicationReset input pinFunctionOperating Temperature (Cel)Number of bitsI2C-bus (kHz)Operating voltage (VDC)Operating voltage 2 (V)InputsOutputsMax Sink Current per bit (mA)No of AddressesVoltage Translation Range (V)Max Sink Current, per package (mA)Enable
PCA9515ATPEnd of LifeSOT1069-2
Package Information
Product IDPackage DescriptionOutline VersionReflow/Wave SolderingPackingProduct StatusPart NumberOrdering code(12NC)MarkingChemical ContentRoHS / Pb Free / RHFLeadFree Conversion DateMSLMSL LF
PCA9515ATPSOT1069-2Reel 7" Q2/T3DiscontinuedPCA9515ATP,147 (9352 977 15147)15APCA9515ATPAlways Pb-free11