PCA8550 2 4-bit multiplexed/1-bit latched 5-bit I C EEPROM DIP switch Rev. 7 8 April 2015 Product data sheet 1. General description 2 The primary function of the 4-bit 2-to-1 I C 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 2 prevent output value changes during I C 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. 2. 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 2 Internal non-volatile register write/readable via I C-bus 2 Write-protect pin enables/disables I C 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 systemsPCA8550 NXP Semiconductors 2 4-bit multiplexed/1-bit latched 5-bit I C EEPROM DIP switch 3. Ordering information Table 1. Ordering information Type number Topside Package marking Name Description Version PCA8550D PCA8550 SO16 plastic small outline package 16 leads body width 3.9 mm SOT109-1 PCA8550DB PA8550 SSOP16 plastic shrink small outline package 16 leads body width SOT338-1 5.3 mm PCA8550PW PCA8550 TSSOP16 plastic thin shrink small outline package 16 leads body SOT403-1 width 4.4 mm 3.1 Ordering options Table 2. Ordering options Type number Orderable Package Packing method Minimum Temperature part number order quantity PCA8550D PCA8550D,118 SO16 REEL 13 Q1/T1 2500 T =0 C to +70 C amb *STANDARD MARK SMD PCA8550DB PCA8550DB,118 SSOP16 REEL 13 Q1/T1 2000 T =0 C to +70 C amb *STANDARD MARK SMD PCA8550PW PCA8550PW,118 TSSOP16 REEL 13 Q1/T1 2500 T =0 C to +70 C amb *STANDARD MARK SMD PCA8550 All information provided in this document is subject to legal disclaimers. NXP Semiconductors N.V. 2015. All rights reserved. Product data sheet Rev. 7 8 April 2015 2 of 23