Processing table
    Interface
    Alarms (#)
    Supply Voltage Vcc (Min) (V)
    Battery Backup
    Battery Seal
    CPU Supervisory Function POR
    Crystal Frequency Trimming
    Frequency Out Pin
    Battery Current (nA)
    Time Keeping Current (µA)
    SRAM
    Selectable Frequency Output
    Oscillator Compensation
    TRIP Voltage for POR
    Accuracy
    Other Functions
    Part Number
    1337AG
    Real-Time Clock With I2C Serial Interface    		 I2C 2 1.8 No No No No No 300 0.9 1 ±10 ppm
    1338
    Real-Time Clock With Battery Backed Non-Volatile RAM    		 I2C 0 1.8 No No No No No 300 1.4 56 Bytes 1 ±20 ppm
    1339
    Real-Time Clock With Serial I2C Interface    		 I2C 2 2 No No No No No 300 1.4 1 ±20 ppm
    ISL12008
    I2C Real Time Clock with Battery Backup Low Power RTC with Battery ReSeal™ Function    		 I2C 1 2.7 Yes Yes No Yes Yes 800 1.6 1 -94 to +140
    ISL12020M
    Real Time Clock with Embedded Crystal, ±5ppm Accuracy    		 I2C 1 2.7 Yes Yes No Yes Yes 1000 3.5 128 Bytes 15 -336 to +337 6 Select VTRIP Levels ±5 ppm
    Battery Status Monitor, Battery Switchover Time Stamp and more...
    ISL12022
    Low Power RTC with Battery-Backed SRAM and Embedded Temp Compensation ±5ppm with Auto Day Light Saving    		 I2C 1 2.7 Yes Yes No Yes Yes 1000 3.5 128 Bytes 15 -336 to +337 6 Select VTRIP Levels ±5 ppm
    Battery Status Monitor, Battery Switchover Time Stamp and more...
    ISL12022M
    Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature Compensation and Auto Daylight Saving    		 I2C 1 2.7 Yes Yes No Yes Yes 1000 3.5 128 Bytes 15 -336 to +337 6 Select VTRIP Levels ±5 ppm
    Battery Status Monitor, Battery Switchover Time Stamp and more...
    ISL12022MA
    Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature Compensation and Auto Daylight Saving    		 I2C 1 2.7 Yes Yes No Yes Yes 1000 3.5 128 Bytes 15 -336 to +337 6 Select VTRIP Levels ±5 ppm
    Battery Status Monitor, Battery Switchover Time Stamp and more...
    ISL12022MR5421
    Low Power RTC with Battery Backed SRAM, Integrated ±5ppm Temperature Compensation and Auto Daylight Saving    		 I2C 1 2.7 Yes Yes No Yes Yes 1000 3.5 128 Bytes 15 -336 to +337 6 Select VTRIP Levels ±5 ppm
    Battery Status Monitor, Battery Switchover Time Stamp and more...
    ISL12026
    Real Time Clock/Calendar with I2C Bus™ and EEPROM    		 I2C 2 2.7 Yes Yes No Yes Yes 850 5 512x8-Bit EEPROM 3 -64 to +110
    ISL12026A
    Real Time Clock/Calendar with I2C Bus™ and EEPROM    		 I2C 2 2.7 Yes Yes No Yes Yes 850 5 512x8-Bit EEPROM 3 -64 to +110
    ISL12057
    Low Cost and Low Power I2C Real Time Clock/Calendar with Alarm Function and Dual IRQ Pins    		 I2C 2 1.4 No No Yes No Yes 0.5 4 Dual Alarms, Dual IRQs
    ISL12058
    Low Cost and Low Power I2C Bus™ Real Time Clock/Calendar Low Power and Low Cost RTC with Alarm Function    		 I2C 2 1.4 No No No No Yes 0.5 4 Dual Alarms
    ISL1208
    I2C Real-Time Clock/Calendar, Low Power RTC with Battery-Backed SRAM    		 I2C 1 2.7 Yes Yes No Yes Yes 400 1.2 2 Bytes 15 -94 to +140 Yes
    ISL1209
    Low Power RTC with Battery Backed SRAM and Event Detection    		 I2C 1 2.7 Yes Yes No Yes Yes 400 1.2 2 Bytes 15 -94 to +140 Yes Event Detect
    ISL1219
    Low Power RTC with Battery Backed SRAM and Event Detection    		 I2C 1 2.7 Yes Yes No Yes Yes 400 1.2 2 Bytes 15 -94 to +140 Event Detect, Time Stamp
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