1

®

FN6668.5

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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ISL12022M

Real Time Clock with Embedded Crystal, ±5ppm Accuracy

Low Power RTC with Battery Backed

SRAM, Integrated ±5ppm Temperature

Compensation, and Auto Daylight Saving

The ISL12022M device is a low power real time clock (RTC)

with an embedded temperature sensor and crystal. Device

functions include oscillator compensation, clock/calendar,

power fail and low battery monitors, brownout indicator,

one-time, periodic or polled alarms, intelligent battery

backup switching, Battery Reseal™ function and 128 bytes

of battery-backed user SRAM. The device is offered in a

20 Ld SOIC module that contains the RTC and an

embedded 32.768kHz quartz crystal. The calibrated

oscillator provides less than ±5ppm drift over the full -40°C to

+85°C temperature range.

The RTC tracks time with separate registers for hours,

minutes, and seconds. The calendar registers track date,

month, year and day of the week and are accurate through

2099, with automatic leap year correction.

Daylight Savings time adjustment is done automatically,

using parameters entered by the user. Power fail and battery

monitors offer user-selectable trip levels. The time stamp

Pinout

ISL12022M

(20 LD SOIC)

TOP VIEW

Features

• Embedded 32.768kHz Quartz Crystal in the Package

• 20 Ld SOIC Package (for DFN version, refer to the

ISL12020M)

• Real Time Clock/Calendar

- Tracks Time in Hours, Minutes and Seconds

- Day of the Week, Day, Month and Year

• On-chip Oscillator Temperature Compensation

- ±5ppm Accuracy Over -40°C to +85°C

• 10-bit Digital Temperature Sensor Output

• Customer Programmable Day Light Saving Time

• 15 Selectable Frequency Outputs

• 1 Alarm

- Settable to the Second, Minute, Hour, Day of the Week,

Day, or Month

- Single Event or Pulse Interrupt Mode

• Automatic Backup to Battery or Supercapacitor

- 1.0µA Battery Supply Current

• Battery Status Monitor

- 2 User Programmable Levels

- Seven Selectable Voltages for Each Level

• Battery Reseal™ Function to Extend Battery Shelf Life

• Power Status Brownout Monitor

- Six Selectable Trip Levels, from 2.295V to 4.675V

• Oscillator Failure Detection

Switchover

• 128 Bytes Battery-Backed User SRAM

- 400kHz Clock Frequency

• Pb-Free (RoHS Compliant)

Applications

• Utility Meters

• POS Equipment

• Medical Devices

• Printers and Copiers

• Digital Cameras

• Security Systems

• Vending Machine

NC

NC

NC

GND

NC

NC

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

NC

NC

GND

NC

NC

GND

NC

NC

NC

SCL

SDA

Data Sheet

July 10, 2009