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PCF85163 - Real-time clock and calendar
X1227 - Real Time Clock/Calendar/CPU Supervisor with EEPROM
S-35390A - 2-WIRE REAL-TIME CLOCK
RTC62423 - 4-bit REAL TIME CLOCK MODULE
RX-8025SA - Real Time Clock Module
HM6818A - Real Time Clock Plus RAM
RV-8263-C7 - Real-Time Clock Module
X1228 - Real Time Clock/Calendar/CPU Supervisor with EEPROM
MSM6242B - DIRECT BUS CONNECTED CMOS REAL TIME CLOCK/CALENDAR
MC146818 - REAL-TIME CLOCK PLUS RAM
DS3231M - I2C Real-Time Clock
HYM8563S - I2C Real Time Clock/Calendar
CDP6818 - CMOS Real Time Clock
R4513 - SERIAL-INTERFACE REAL TIME CLOCK MODULE
MM58274C-12 - Microprocessor Compatible Real Time Clock
X1226 - Real Time Clock/Calendar with EEPROM
X1243 - Real Time Clock/Calendar/Alarm with EEPROM
X1227 - RTC Real TimeClock/Calendar/ CPU Supervisor
X1288 - RTC Real Time Clock/Calendar/CPU Supervisor
RX-8571SA - REAL TIME CLOCK MODULE