Hitachi HD146818P Real-Time Clock RTC 24-pin IC Chip @CPUCC

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MC146818P MOTOROLA - IC - 24PIN DIP - NOS

MC146818AP Motorola Real-Time Clock + RAM (RTC) -- NOS

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Motorola MC146818AP Real-time Clock Plus RAM ( RTC )

Texas Instruments BQ3287AMT-I Real Time Clock RTC Module w/114x8 NVRAM DIP-24