ISL1218

Features:

• Real Time Clock/Calendar
- Tracks Time in Hours, Minutes, and Seconds
- Day of the Week, Day, Month, and Year
• 15 Selectable Frequency Outputs
• Single 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 Super Cap
• Power Failure Detection
• On-Chip Oscillator Compensation
• 8 Bytes Battery-Backed User SRAM
• I²C Interface
- 400kHz Data Transfer Rate
• 400nA Battery Supply Current
• Same Pin Out as ST M41Txx and Maxim DS13xx Devices
• Small Package Options
- 8 Ld MSOP and SOIC Packages
• Pb-Free Plus Anneal Available (RoHS Compliant)






Application

• Utility Meters
• HVAC Equipment
• Audio/Video Components
• Set Top Box/Television
• Modems
• Network Routers, Hubs, Switches, Bridges
• Cellular Infrastructure Equipment
• Fixed Broadband Wireless Equipment
• Pagers/PDA
• POS Equipment
• Test Meters/Fixtures
• Office Automation (Copiers, Fax)
• Home Appliances
• Computer Products
• Other Industrial/Medical/Automotive





Pinout






Specifications

Voltage on V_DD, V_BAT, SCL, SDA, and IRQ/FOUT Pins
(respect to ground) . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7.0V
Voltage on X1 and X2 Pins
(respect to ground) . . . . . . . . . . . .-0.5V to V_DD + 0.5 (V_DD Mode)
-0.5V to V_BAT + 0.5 (V_BAT Mode)
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . .-65 to +150
Lead Temperature (Soldering, 10s) . . . . . . . . . . . . . . . . . . . . . 300
ESD Rating (Human Body Model) . . . . . . . . . . . . . . . . . ... . . . . .>2kV
ESD Rating (Machine Model . . . . . . . . . . . . . . . . . . . . . . . ... . .>175V

CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to
thedevice. This is a stress only rating and operation of the device at these or any other conditions
above those indicated in the operational sections of this specification is not implied.

NOTE:1. JA is measured with the component mounted on a high effective thermal conductivity test board in free
air. See Tech Brief TB379 for details.





Description

The ISL1218 device is a low power real time clock with timing and crystal compensation, clock/calendar, power fail indicator, periodic or polled alarm, intelligent battery backup switching and battery-backed user SRAM. The oscillator uses an external, low-cost 32.768kHz crystal. The real time clock tracks time with separate registers for hours, minutes, and seconds. The ISL1218 has calendar registers for date, month, year and day of the week. The calendar is accurate through 2099, with automatic leap year correction.