AB-RTCMK-32.768KHZ-T RTC-4574SA:B0 ROHS MCP79400-I/MS DS1340Z-33+T&R MCP79411T-I/ST AB-RTCMC-32.768KHZ-EOZ9-S3-DBT DS1339U-3+T&R RX-4581NB:B0 ROHS PCF8563T/5,518 DS1394U-33+T&R MCP79412T-I/MS AB-RTCMC-32.768KHZ-EOA9-S3-DBT RX-4045SA:AA0:PURE SN RX-4581NB:B ROHS MCP79401-I/SN DS1340U-33+T&R MCP79412T-I/ST AB-RTCMC-32.768KHZ-EOA9-S3-HAT RV-8523-C3-32.768KHZ-10PPM-TA-QC M48T512V-85PM1