• Description

ISL1208IB8Z-TK Real Time Clock (RTC) IC Clock/Calendar 2B I²C 2-Wire Serial 8-SOIC

The ISL1208 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 device has calendar registers for date, month, year and day of the week. The calendar is accurate through 2099, with automatic leap year correction.



• 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



• 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 Capacitor

• Power Failure Detection

• On-Chip Oscillator Compensation

• 2 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

- 8 Ld TDFN Package

• Pb-Free Available (RoHS Compliant)



specification of ISL1208IB8Z-TK


Integrated Circuits (ICs)
Real Time Clocks




Alarm, Leap Year, SRAM

Memory Size


Time Format

HH:MM:SS (12/24 hr)

Date Format



I²C, 2-Wire Serial

Voltage - Supply

2.7V ~ 5.5V

Voltage - Supply, Battery

1.8V ~ 5.5V

Current - Timekeeping (Max)

4µA ~ 6µA @ 3V ~ 5V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

8-SOIC (0.154", 3.90mm Width)

Supplier Device Package


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