DS1339AU+
Maxim Integrated
Low-Current, I2C, Serial Real-Time Clock
DS1339U-33
Maxim Integrated
I2C Serial Real-Time Clock
DS1302S
DALLAS
Trickle Charge Timekeeping Chip
ISL1208IB8
Intersil
I2C Real Time Clock/Calendar, Low Power RTC with Battery Backed SRAM
M41T62LC6F
STMicroelectronics
Low-power serial real-time clocks (RTCs) with alarm
PCF8563P
Philips
Real-time clock/calendar
PCF8563T
NXP Semiconductors
Real-time clock/calendar
PCF8563TS
Philips
Real-time clock/calendar
S-3530AEFS
Seiko Instruments
a CMOS real-time clock IC supporting an I2C-BUS
SD2405ALPI-G
深圳市兴威帆电子技术有限公司
内置晶振、充电电池、I2C串行接口的高Tolerance实时时钟