DATASHEET 2 ISL12008 I C Real Time Clock with Battery Backup FN6690 Rev 1.00 Low Power RTC with Battery ReSeal Function Sep 26, 2008 The ISL12008 device is a low power real time clock/calendar Features that is pin compatible and functionally equivalent to the Pin Compatible to ST M41T00S and Maxim DS1340 ST M41T00S and Maxim DS1340 with timing and crystal Functionality Equivalent to ST M41T00S and Maxim compensation. The device additionally provides power-fail DS1340 indicator, software alarm and intelligent battery backup. Real Time Clock/Calendar The oscillator uses an external, low-cost 32.768kHz crystal. - Tracks Time in Hours, Minutes, Seconds and The real time clock tracks time with separate registers for Sub-seconds hours, minutes, and seconds. The device has calendar - Day of the Week, Day, Month, and Year registers for date, month, year and day of the week. The calendar is accurate through 2099, with automatic leap year 512Hz Frequency Outputs for On-Chip Crystal correction. Compensation Software Alarm Pinout - Settable to the Second, Minute, Hour, Day of the Week, ISL12008 Day, or Month (8 LD SOIC) TOP VIEW Automatic Low-Drop Battery Switch for Longest Backup Life X1 1 8 V DD 2 7 X2 FT/OUT Power Failure Detection V 3 6 SCL BAT Battery ReSeal for Long Shelf Life GND 4 5 SDA 2 I C Bus - 400kHz Data Transfer Rate Ordering Information 800nA Battery Supply Current PART V TEMP. DD Small Package Option NUMBER PART RANGE RANGE PACKAGE PKG. (Note) MARKING (V) (C) (Pb-free) DWG. - 8 Ld SOIC ISL12008IB8Z 12008 IBZ 2.7 to 5.5 -40 to +85 8 Ld SOIC M8.15 Pb-Free (RoHS Compliant) ISL12008IB8Z-T* 12008 IBZ 2.7 to 5.5 -40 to +85 8 Ld SOIC M8.15 Applications *Please refer to TB347 for details on reel specifications. NOTE: These Intersil Pb-free plastic packaged products employ special Utility Meters Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS HVAC Equipment compliant and compatible with both SnPb and Pb-free soldering Audio/Video Components operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of Set-Top Box/Television IPC/JEDEC J STD-020. 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 . FN6690 Rev 1.00 Page 1 of 19 Sep 26, 20082 ISL12008 I C Real Time Clock with Battery Backup Block Diagram SDA SDA SECONDS BUFFER 2 I C RTC INTERFACE MINUTES SCL SCL CONTROL BUFFER LOGIC HOURS DAY OF WEEK X1 CRYSTAL RTC DATE OSCILLATOR DIVIDER X2 MONTH V DD YEAR POR FREQUENCY OUT CONTROL V REGISTERS TRIP SWITCH FT/OUT INTERNAL V BAT SUPPLY Pin Descriptions PIN NUMBER SYMBOL DESCRIPTION 1 X1 The X1 pin is the input of an inverting amplifier and is intended to be connected to one pin of an external 32.768kHz quartz crystal. X1 can also be driven directly from a 32.768kHz source. 2 X2 The X2 pin is the output of an inverting amplifier and is intended to be connected to one pin of an external 32.768kHz quartz crystal. 3V This input provides a backup supply voltage to the device. V supplies power to the device in the event that the V supply BAT BAT DD fails. This pin should be tied to ground if not used. 4 GND Ground 5 SDA Serial Data (SDA) is a bidirectional pin used to transfer serial data into and out of the device. It has an open drain output and may be wire ORed with other open drain or open collector outputs. 6 SCL The Serial Clock (SCL) input is used to clock all serial data into and out of the device. 7 FT/OUT 512Hz Frequency Output or digital output pin. The function is set via the configuration register. This pin is open drain and requires an external pull-up resistor. 8V Power supply DD FN6690 Rev 1.00 Page 2 of 19 Sep 26, 2008