PCA8550PW

4-bit multiplexed/1-bit latched 5-bit I2C EEPROM DIP switch


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The primary function of the 4-bit 2-to-1 I²C multiplexer is to select either a 4-bit input or data from a non-volatile register and drive this value onto the output pins. One additional non-multiplexed register output is also provided. The non-multiplexed output is latched to prevent output value changes during I²C writes to the non-volatile register. A write protect input is provided to enable/disable the ability to write to the non-volatile register. An ?override? input feature forces all outputs to logic 0.

Features and benefits

  • 4-bit 2-to-1 multiplexer, 1-bit latch DIP switch
  • 5-bit internal non-volatile register
  • Override input forces all outputs to logic 0
  • Internal non-volatile register write/readable via I²C-bus
  • Write-protect pin enables/disables I²C writes to register
  • 2.5 V multiplexed outputs
  • 3.3 V non-multiplexed output (latched)
  • 5 V tolerant inputs
  • Useful for ?jumperless? configuration of PC motherboards
  • Designed for use in Pentium Pro/Pentium IItm systems
All information on this product information page is subject to the subsequent disclaimers:
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Parametrics of this product

Type numberPackage# of Outputs/Latched Outputs/Internal EEPROM RegistersOperating voltage(VDC)I²C-bus(kHz)Operating
temp.(Cel)		# of Addresses
PCA8550PWSOT403-1
(TSSOP16)		4?1?13.0~3.64000~701

Products / Packages

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarking
PCA8550PW/DGPCA8550PW/DG,1189352 858 95118Volume productionSOT403-1
(TSSOP16) 		Reel Pack, SMD, 13"Standard Marking
PCA8550PWPCA8550PW,1129352 598 70112Volume productionSOT403-1
(TSSOP16) 		TubeStandard Marking
PCA8550PWPCA8550PW,1189352 598 70118Volume productionSOT403-1
(TSSOP16) 		Reel Pack, SMD, 13"Standard Marking

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHSLeadfree conversion dateRHFIFR (FIT)MTBF (hours)MSLMSL LF
PCA8550PW/DGPCA8550PW/DG,118PCA8550PW/DGAlways Pb-free11
PCA8550PWPCA8550PW,112PCA8550PWweek 12, 200511
PCA8550PWPCA8550PW,118PCA8550PWweek 12, 200511
Quality and reliability disclaimer

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Documentation for this product

TypeFormatTitleDate
Data sheetpdf4-bit multiplexed/1-bit latched 5-bit I2C EEPROM DIP switch (v.6.0)2003-06-27
Application notepdfLevel shifting techniques in I2C-bus design (v.1.0)2007-06-20
Application notepdfI2C manual (v.1.0)2003-03-27
Application notepdfPCA8550 4-bit multiplexed/1-bit latched 5-bit I2C EEPROM (v.1.0)1998-10-01
Application notepdfA guide to designing for ESD and EMC (v.2.0)2010-01-22
LeafletpdfI2C Selection Guide 2H 2011 (v.1.0)2011-09-29
User manualpdfI2C-bus specification and user manual (v.4.0)2007-06-26
User manualpdfI2C Demonstration Board 2005-1 Quick Start Guide (v.1.0)2006-06-13

Ordering & availability

Type numberOrdering code(12NC)Orderable part numberRegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
PCA8550PW/DG9352 858 95118PCA8550PW/DG,118NAAVNET EXPRESS2,5005/24/2012Buy online 
   JAPANCHIP ONE STOPno05/14/2012Buy online 
PCA8550PW9352 598 70112PCA8550PW,112EUAVNET EXPRESS EUROPE9605/24/2012Buy onlinenot available
   JAPANCHIP ONE STOPno05/14/2012Buy online 
PCA8550PW9352 598 70118PCA8550PW,118NAMOUSER ELECTRONICS2,0675/24/2012Buy online 
   NAMOUSER ELECTRONICS2,0675/24/2012Buy online 
   NAAVNET EXPRESS1755/24/2012Buy online 
   JAPANCHIP ONE STOPno05/14/2012Buy online 

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