P82B715: I2C-bus extender

The P82B715 is a bipolar IC intended for application in IC-bus and derivative bus systems. While retaining all the operating modes and features of the IC-bus it permits extension of the practical separation distance between components on the I2C-bus by buffering both the data (SDA) and the clock (SCL) lines.

The IC-bus capacitance limit of 400 pF restricts practical communication distances to a few meters. Using one P82B715 at each end of a long cable (connecting Lx/Ly to Lx/Ly) reduces that cables loading on the linked IC-buses by a factor of 10 and allows the total system capacitance load (all devices, cable, connectors, and traces or wires connected to the IC-bus) to be around 3000 pF while the loading on each IC-bus on the Sx/Sy sides remains below 400 pF. Longer cables or low-cost, general-purpose wiring may be used to link IC-bus based modules without degrading noise margins. Multiple P82B715s can be connected together, linking their Lx/Ly ports, in a star or multi-point architecture as long as the total capacitance of the system is less than about 3000 pF and each bus at an Sx/Sy connection is well below 400 pF. This configuration, with the master and/or slave devices attached to the Sx/Sy port of each P82B715, has full multi-master communication capability. The P82B715 alone does not support voltage level translation, but it can be simply implemented using low cost transistors when required. There is no restriction on interconnecting the Sx/Sy I/Os, and, because the device output levels are always held within 100 mV of input drive levels, P82B715 is compatible with bus buffers that use voltage level offsets, e.g., PCA9511A, PCA9517, Sx/Sy side of P82B96.

The lower VOL level and ability to operate with any master, slave or bus buffer is the primary advantage of the using the P82B715 for long distance buses at the disadvantage of not isolating bus capacitance like the P82B96 or PCA9600 are able to do. The primary disadvantage of the P82B96 and PCA9600 is that the static level offset needed to isolate bus capacitance does not allow these devices to operate with other bus buffers with special offset levels or with master/slaves that require a VIL lower than 0.8 V with noise margin. A proven quick design-in point-to-point/multi-point circuit is included in Section 8.2 to allow rapid use of the P82B715 along with comparison waveforms so that the designer can clearly see the trade-offs between the P82B715 and the P82B96/PCA9600 and choose the type of device that is best for their application.

P82B715: Product Block Diagram
sot096-1_3d
Data Sheets (1)
Name/DescriptionModified Date
I2C-bus extender (REV 8.0) PDF (147.0 kB) P82B71510 Nov 2009
Application Notes (4)
Name/DescriptionModified Date
Very large I2C-bus systems and long buses (REV 1.0) PDF (216.0 kB) AN1108426 Oct 2011
Features and applications of the P82B715 I2C-bus extender (REV 2.0) PDF (254.0 kB) AN1071006 Sep 2010
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
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
Extend standard I2C-bus devices without worrying about offset voltages; NXP® I2C-bus extender P82B715 in... (REV 1.0) PDF (494.0 kB) 7501652701 May 2008
Package Information (1)
Name/DescriptionModified Date
plastic small outline package; 8 leads; body width 3.9 mm (REV 1.0) PDF (244.0 kB) SOT96-108 Feb 2016
Packing (1)
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
Reports or Presentations (1)
Name/DescriptionModified Date
design_con_2003_tecforum_i2c_b_1 (REV 0.1) PDF (4.2 MB) DESIGN_CON_2003_TECFORUM_I2C_B_127 Jan 2003
Supporting Information (3)
Name/DescriptionModified Date
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
P82B715TDActiveSOT96-1-40~851004.5~12.011
Package Information
Product IDPackage DescriptionOutline VersionReflow/Wave SolderingPackingProduct StatusPart NumberOrdering code(12NC)MarkingChemical ContentRoHS / Pb Free / RHFLeadFree Conversion DateEFRIFR(FIT)MTBF(hour)MSLMSL LF
P82B715TDSOT96-1SO-SOJ-REFLOW SO-SOJ-WAVE
SO-SOJ-REFLOW SO-SOJ-WAVE
Reel 13" Q1/T1ActiveP82B715TD,118 (9351 547 70118)P82B715P82B715TDweek 17, 20050.02.05E811
Bulk PackActiveP82B715TD,112 (9351 547 70112)P82B715P82B715TDweek 17, 20050.02.05E811
I2C-bus extender p82b715pn
Very large I2C-bus systems and long buses pca9601
Features and applications of the P82B715 I2C-bus extender pca9600
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
Extend the I2C-bus with advanced repeaters and hubs; NXP® 2-channel I2C-bus repeaters PCA9515x and... pca9600
Extend standard I2C-bus devices without worrying about offset voltages; NXP® I2C-bus extender P82B715 in... PCA9633
design_con_2003_tecforum_i2c_b_1 lm75a
Reflow_Soldering_Profile Wave_Soldering_Profile LPC1112FD20
P82B715 IBIS model P82B715TD
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
P82B715
SA612A