PCA9521DP

Fast dual bidirectional bus buffer


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The PCA9521 is a monolithic bipolar integrated circuit for bus buffering in applications including I²C-bus, SMBus, PMBus, and other systems based on similar principles.

The buffer extends the bus load limit by buffering both the SCL and SDA lines. It supports up to 400 pF loads on each side of the buffer at 400 kHz. Higher capacitance is supported at lower speeds, and lower capacitance at higher speeds up to 1 MHz.

The enable function allows sections of the bus to be isolated. Individual parts of the system can be brought on-line successively. This means a controlled start-up using a diverse range of components, operating speeds and loads is easily achieved. Systems employing removable components on a back-plane (for example, telecommunications racks) can use the enable pin and the high-impedance ports on power-down to safely install and remove components in active systems.

Bus level translation between a very wide range of bus voltages, from 1.8 V to 10 V, is supported. This feature provides enormous flexibility in interfacing systems of different technologies.

The unique operation of the PCA9521 provides one of the fastest response times of such bidirectional buffers, ensuring any glitches (common to other buffers) are kept well within the 50 ns I²C-bus specification. Additionally, it does this without the need for ‘rise-time accelerators’ which, combined with low noise margins, may cause glitches outside of the I²C-bus specification.

Features and benefits

  • Dual, bidirectional unity gain buffer
  • Fast switching times allow operation in excess of 1 MHz
  • Supports I²C-bus (Standard-mode and Fast-mode), SMBus (standard and high power mode), PMBus and IPMB
  • Enable allows bus segments to be disconnected
  • Low standby current when not enabled
  • Application/removal of power to IC will not interfere with other bus activity
  • 6 mA (static) pull-down capability supports a wide range of bus standards
  • Low noise susceptibility
  • Low input-output offset voltage
  • Threshold and offset parameters allow the connection of several devices in series
  • Bus levels independent of supply voltage
  • Operating voltages from 2.7 V to 5.5 V
  • Wide range of bus voltages from 1.8 V to 10 V
  • Level shifting between different bus voltages
  • Achieves superior response times without the need for rise time accelerators
  • ESD protection exceeds 2 kV HBM per JESD22-A114 and 500 V CDM per JESD22-C101
  • Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

Applications

  • Power management systems
  • Telecommunications systems including ATCA
  • Desktop and portable computers including RAID
  • Building automation
  • TV/projector/monitor interconnection
  • Game consoles/boxes
  • CompactPCI
  • Medical systems
  • Gaming machine networks
  • Backplane management/interconnect
All information on this product information page is subject to the subsequent disclaimers:
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Demo boards

OM13491OM13491

Surface Mount to DIP Evaluation Board OM13491


Parametrics of this product

Type numberPackage versionOperating Temperature (Cel)Operating voltage (VDC)InputsOutputsI2C-bus (kHz)
PCA9521DPSOT505-1-40~852.7~5.5111000

Package

Type numberPackageOutline versionReflow-/Wave solderingPackingProduct statusMarkingOrderable part number, (Ordering code (12NC))
PCA9521DPTSSOP8
(SOT505-1)
sot505-1_posot505-1_fr
SSOP-TSSOP-VSO-WAVE
Reel Pack, SMD, 13" Q1/T1Volume production9521PCA9521DP,118
( 9352 924 34118 )

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFR (FIT)MTBF (hour)MSLMSL LF
PCA9521DPPCA9521DP,118PCA9521DPAlways Pb-free11
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Documentation for this product

File nameTitleTypeFormatDate
PCA9521Fast dual bidirectional bus bufferData sheetpdf2013-03-19
75017424NXP I2C-bus solutions 2013: Smart, simple solutions for the 12 most common design concernsLeafletpdf2013-05-23
UM10204I2C-bus specification and user manualUser manualpdf2014-04-07
UM10206I2C Demonstration Board 2005-1 Quick Start GuideUser manualpdf2006-06-12
UM10204_JAI2C-bus specification and user manualUser manualpdf2013-04-03
SOT505-1_118TSSOP8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118Packingpdf2013-04-15
sot505-1_poplastic thin shrink small outline package; 8 leads; body width 3 mmOutline drawingpdf2009-10-08
SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave solderingpdf2009-10-08
sot505-1_frFootprint for reflow soldering SOT505-1Reflow solderingpdf2010-07-20
Wave_Soldering_ProfileWave Soldering ProfileWave solderingpdf2013-09-30
Reflow_Soldering_ProfileReflow Soldering ProfileReflow solderingpdf2013-09-30

Ordering & availability

Type numberOrdering code (12NC)Orderable part numberRegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
PCA9521DP9352 924 34118PCA9521DP,118NADigiKey3,96314/17/2014Buy online 

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Demo boards

OM13491
OM13491

Surface Mount to DIP Evaluation Board OM13491

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