PCA8550

General description

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

• 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^tm systems

Products/packages

Pricing/ordering/availability

Applications

Related applications
LCD display - discretes focus
PDA - discretes focus
Motherboard components
50-60 Hz CRT integrated DTV (TV210D)
Mid-range integrated DTV (TV810)
Intelligent washing machine

Technical documents

Application Notes

AN10216_1; I2C manual (27-Mar-03)

AN10441_1; Level shifting techniques in I²C-bus design (20-Jun-07)

AN250_1; PCA8550 4-bit multiplexed/1-bit latched 5-bit I2C EEPROM (01-Oct-98)

Support Documents

75015669; Continuous innovation. Timeless lifespan. (01-Sep-06)

75011212; I2C 2002-1A Evaluation Board Kit (01-Mar-03)

UM10206_1; I2C Demonstration Board 2005-1 Quick Start Guide (13-Jun-06)

UM10204_3; I2C-bus specification and user manual (26-Jun-07)

pca8550s; IBIS model of PCA8550 4-bit multiplexed/1-bit latched 5-bit I2C/EEPROM SO 16-pin Package (1999-10-20)

pca8550p; IBIS model of PCA8550 4-bit multiplexed/1-bit latched 5-bit I2C/EEPROM SSOP 16-pin Package (1999-10-20)

pca8550t; IBIS model of PCA8550 4-bit multiplexed/1-bit latched 5-bit I2C/EEPROM TSSOP 16-pin Package (1999-10-20)

75014395; Your connection to I 2 C,UART,CAN,and USB Connecting with Philips Wired Connectivity (2005-04-01)

Parametrics/similar products

Similar products

PCA8550 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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