ISL12057

Low Cost and Low Power I<sup>2</sup>C RTC/Calendar with Alarm Function and Dual IRQ pins

Product Status: Mass Production

OVERVIEW

The ISL12057 device is a low-power, real-time clock that is pin compatible and functionally equivalent to Maxim DS1337 with clock/calendar and alarm function.

The oscillator uses an external, low-cost 32.768kHz crystal with 6pF load capacitance. The real-time clock tracks time with separate registers for hours, minutes, and seconds. The device has calendar registers for date, month, year, and day of the week. The calendar is accurate through 2099, with automatic leap year correction.

KEY FEATURES

  • Pin Compatible to Maxim DS1337
  • Functionally Equivalent to Maxim DS1337
  • Real-Time Clock/Calendar
  • Tracks Time in Hours, Minutes, and Seconds
  • Day of the Week, Date, Month, and Year
  • Dual Interrupts for Frequency Output and Alarm interrupts
  • Four Selectable Frequency Outputs
  • Two Alarms
  • Settable to the Second, Minute, Hour, Day of the Week, and Date
  • I2C Interface
  • 400kHz Data Transfer Rate
  • Small Package Options
  • 8 Ld 2mmx2mm UTDFN
  • 8 Ld MSOP
  • 8 Ld SOIC
  • Pb-Free (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL12057
Basic Information
Production Status
Mass Production
Supply Voltage Vcc (Min) (V)
1.4
Supply Voltage Vcc (Max) (V)
3.6
Alarms
2
Crystal Frequency Trimming
No
Selectable Frequency Output
4
CPU Supervisory Function POR
Yes
CPU Supervisory Function Watchdog Timer
No
Battery Seal
N/A
Battery Backup
N/A
IRQ_Bar
IRQ1/FOUT, IRQ2
FOUT
IRQ1/FOUT
Other Functions
Dual Alarms, Dual IRQs
Memory Type
RAM
Bus/Output Interface
I2C
Time Keeping Current
0.5 µA
IRQ Pin
Yes
Freq. Out Pin
Yes
Timer
No
Tamper Detect
No
Reset
No
Qualification Level
Standard
Battery Voltage Range (V)
N/A
Supply Voltage Vcc Range (V)
1.4 to 3.6
Can Sample
YES
Temperature Range
-40 to +85

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