PCA9511A: Hot swappable I2C-bus and SMBus bus buffer

The PCA9511A is a hot swappable I²C-bus and SMBus buffer that allows I/O card insertion into a live backplane without corrupting the data and clock buses. Control circuitry prevents the backplane from being connected to the card until a stop command or bus idle occurs on the backplane without bus contention on the card. When the connection is made, the PCA9511A provides bidirectional buffering, keeping the backplane and card capacitances isolated.

The PCA9511A rise time accelerator circuitry allows the use of weaker DC pull-up currents while still meeting rise time requirements. The PCA9511A incorporates a digital ENABLE input pin, which enables the device when asserted HIGH and forces the device into a low current mode when asserted LOW, and an open-drain READY output pin, which indicates that the backplane and card sides are connected together (HIGH) or not (LOW).

During insertion, the PCA9511A SDA and SCL lines are precharged to 1 V to minimize the current required to charge the parasitic capacitance of the chip.

PCA9511A: Product Block Diagram
PCA9511A: Block Diagram
sot096-1_3d
Data Sheets (1)
Name/DescriptionModified Date
Hot swappable I2C-bus and SMBus bus buffer (REV 4.0) PDF (149.0 kB) PCA9511A19 Aug 2009
Application Notes (2)
Name/DescriptionModified Date
Level shifting techniques in I2C-bus design (REV 1.0) PDF (52.0 kB) AN1044120 Jun 2007
I2C / SMBus Repeaters, Hubs and Expanders (REV 2.0) PDF (1.0 MB) AN25519 Dec 2002
Users Guides (4)
Name/DescriptionModified Date
I2C-bus specification and user manual (REV 6.0) PDF (1.4 MB) UM1020428 Apr 2014
I2C-bus specification and user manual (REV 5.0) PDF (1.6 MB) UM10204_JA03 Apr 2013
PCA9600 demonstration board OM6293 (REV 1.0) PDF (130.0 kB) UM1032315 Dec 2008
I2C Demonstration Board 2005-1 Quick Start Guide (REV 1.0) PDF (261.0 kB) UM1020613 Jun 2006
Brochures (3)
Name/DescriptionModified Date
NXP® I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns (REV 1.0) PDF (3.5 MB) 7501754001 Aug 2014
I2C/SMBus buffers for backplane multi-point and hot-swap applications; NXP® Level-shifting and... (REV 1.0) PDF (773.0 kB) 7501653001 Jul 2008
Extend the I2C-bus with advanced repeaters and hubs; NXP® 2-channel I2C-bus repeaters PCA9515x and... (REV 1.0) PDF (740.0 kB) 7501653201 Jul 2008
Package Information (2)
Name/DescriptionModified Date
plastic thin shrink small outline package; 8 leads; body width 3 mm (REV 1.0) PDF (240.0 kB) SOT505-108 Feb 2016
plastic small outline package; 8 leads; body width 3.9 mm (REV 1.0) PDF (244.0 kB) SOT96-108 Feb 2016
Packing (2)
Name/DescriptionModified Date
SO8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... (REV 2.0) PDF (232.0 kB) SOT96-1_11819 Apr 2013
TSSOP8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... (REV 1.0) PDF (214.0 kB) SOT505-1_11815 Apr 2013
Supporting Information (4)
Name/DescriptionModified Date
Reflow Soldering Profile (REV 1.0) PDF (34.0 kB) REFLOW_SOLDERING_PROFILE30 Sep 2013
Wave Soldering Profile (REV 1.0) PDF (20.0 kB) WAVE_SOLDERING_PROFILE30 Sep 2013
Footprint for reflow soldering (REV 1.0) PDF (9.0 kB) SO-SOJ-REFLOW08 Oct 2009
Footprint for wave soldering (REV 1.0) PDF (8.0 kB) SO-SOJ-WAVE08 Oct 2009
IBIS Model
Ordering Information
ProductStatusPackage versionOperating Temperature (Cel)I2C-bus (kHz)Operating voltage (VDC)InputsOutputs
PCA9511ADActiveSOT96-1-40~854002.7~5.511
PCA9511ADPActiveSOT505-1-40~854002.7~5.511
Package Information
Product IDPackage DescriptionOutline VersionReflow/Wave SolderingPackingProduct StatusPart NumberOrdering code(12NC)MarkingChemical ContentRoHS / Pb Free / RHFLeadFree Conversion DateEFRIFR(FIT)MTBF(hour)MSLMSL LF
PCA9511ADPSOT505-1Reflow_Soldering_ProfileReel 13" Q1/T1ActivePCA9511ADP,118 (9352 793 08118)9511APCA9511ADPweek 13, 20050.02.05E811
PCA9511ADSOT96-1SO-SOJ-REFLOW SO-SOJ-WAVE
SO-SOJ-REFLOW SO-SOJ-WAVE
Reel 13" Q1/T1ActivePCA9511AD,118 (9352 793 07118)PA9511APCA9511ADweek 13, 20050.02.05E811
Bulk PackActivePCA9511AD,112 (9352 793 07112)PA9511APCA9511ADweek 13, 20050.02.05E811
Hot swappable I2C-bus and SMBus bus buffer pca9511a
Level shifting techniques in I2C-bus design pca9685pw
I2C / SMBus Repeaters, Hubs and Expanders pca9600
I2C-bus specification and user manual pca9685pw
I2C-bus specification and user manual pca9685pw
PCA9600 demonstration board OM6293 pca9600
I2C Demonstration Board 2005-1 Quick Start Guide pca9685pw
NXP® I2C-bus solutions 2014: Smart, simple solutions for the 12 most common design concerns pca9685pw
I2C/SMBus buffers for backplane multi-point and hot-swap applications; NXP® Level-shifting and... pca9518apw
Extend the I2C-bus with advanced repeaters and hubs; NXP® 2-channel I2C-bus repeaters PCA9515x and... pca9600
Reflow_Soldering_Profile Wave_Soldering_Profile LPC1112FD20
PCA9511ADP IBIS model PCA9511ADP
plastic thin shrink small outline package; 8 leads; body width 3 mm pesd5v0l7bas
Reflow_Soldering_Profile Wave_Soldering_Profile LPC1112FD20
TSSOP8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or... pesd5v0l7bas
plastic small outline package; 8 leads; body width 3.9 mm CBT3306_Q100
Footprint for reflow soldering NPIC6C596A_Q100
Footprint for wave soldering NPIC6C596A_Q100
SO8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering... CBT3306_Q100
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