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PCA9539DGVRObsolete
Texas Instruments
16-BIT 2.3- TO 5.5-V I2C/SMBUS I/O EXPANDER WITH INTERRUPT, RESET & CONFIG REGISTERS
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Understanding and Interpreting Standard-Logic Data Sheets (Rev. C)
PCA9539 Remote 16-Bit I2C and SMBus Low-Power I/O Expander With Interrupt Output, Reset, and Configuration Registers datasheet (Rev. H)