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.

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Data Sheet

Application Notes

Product Details

Block Diagram

PCA8550 Block Diagram

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Features

Key Features

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 II systems

Part numbers include: PCA8550D, PCA8550DB, PCA8550PW.

Buy/Parametrics

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Documentation

Quick reference to our documentation types.

1-5 of 11 documents

^{Data Sheet}
4-bit multiplexed/1-bit latched 5-bit I2C EEPROM DIP switch

PDFRev 7.0Apr 8, 2015559.8 KBPCA8550English
^{Application Note}
AN10216

PDFRev 1.0Mar 27, 20034.3 MBAN10216English
^{Application Note}
AN250_1

PDFRev 1.0Oct 1, 199861.3 KBAN250_1English
^{User Guide}
I2C-bus specification and user manual

PDFRev 7.0Oct 1, 2021751.0 KBUM10204English, 日本語
^{User Guide}
PCA9632 demonstration board OM13269

PDFRev 1.0Feb 6, 2012749.6 KBUM10528English
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^{Package Information}
plastic, thin shrink small outline package; 16 leads; 0.65 mm pitch; 5 mm x 4.4 mm x 1.1 mm body

PDFRev 1.2Dec 10, 2019298.1 KBSOT403-1English
^{Package Information}
plastic shrink small outline package; 16 leads; body width 5.3 mm

PDFRev 1.0Feb 8, 2016313.1 KBSOT338-1English
^{Packing Information}
TSSOP16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118

PDFRev 1.0Apr 8, 2013223.6 KBSOT403-1_118English
^{Supporting Information}
Footprint for Wave Soldering

PDFRev 1.0Oct 8, 20098.3 KBSO-SOJ-WAVEEnglish
^{Supporting Information}
Footprint for reflow soldering

PDFRev 1.0Oct 8, 200916.4 KBSSOP-TSSOP-VSO-REFLOWEnglish
^{Supporting Information}
Footprint for reflow soldering

PDFRev 1.0Oct 8, 20098.8 KBSO-SOJ-REFLOWEnglish

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Design Resources

Design Files

Quick reference to our design files types.

5 design files

Receive the full breakdown. See the product footprint and more in the eCad file.

^Models
PCA8550DB IBIS model

IBSRev 1.0Jul 25, 2014 00:00:0082.3 KBPCA8550P
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^Models
PCA8550PW IBIS model

IBSRev 1.0Jul 25, 2014 00:00:0082.3 KBPCA8550T
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^Models
PCA8550D IBIS model

IBSRev 1.0Jul 25, 2014 00:00:0082.3 KBPCA8550S
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^{Symbols and Footprints}
PCA8550PW-TSSOP16-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1May 21, 2020 15:01:0038.9 KBPCA8550PW-TSSOP16-BXL
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^{Symbols and Footprints}
PCA8550DB-SO16-BXL-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1May 21, 2020 15:01:0050.7 KBPCA8550DB-SO16-BXL
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Engineering Services

To get further assistance directly from NXP, please see our Engineering Services.

2 engineering services

^{Independent Design House (IDH)}
Hardware Design Services

By TAGnology RFID GmbH GoldHQ: Voitsberg, AustriaSupporting Regions: EMEA
^{Independent Design House (IDH)}
Embedded Software Design

By TAGnology RFID GmbH GoldHQ: Voitsberg, AustriaSupporting Regions: EMEA

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4-Bit Multiplexed/1-Bit Latched 5-Bit I²C EEPROM DIP Switch