DATASHEET ISL1221 FN6316 Rev 1.00 Low Power RTC with Battery Backed SRAM and Event Detection July 15, 2010 The ISL1221 device is a low power real time clock with Features Event Detect and Time Stamp function, timing and crystal Real Time Clock/Calendar compensation, clock/calendar, power fail indicator, periodic - Tracks Time in Hours, Minutes, and Seconds or polled alarm, intelligent battery backup switching with - Day of the Week, Day, Month, and Year separate F output and 2 Bytes of battery-backed user OUT SRAM. Security and Event Functions - Tamper detection with Time Stamp in Normal and The oscillator uses an external, low-cost 32.768kHz crystal. Battery Backed modes The real time clock tracks time with separate registers for - Event Detection During Battery Backed or Normal hours, minutes, and seconds. The device has calendar Modes registers for date, month, year and day of the week. The - Selectable Event Input Sampling Rates Allows Low calendar is accurate through 2099, with automatic leap year Power Operation correction. - Selectable Glitch Filter on Event Input Monitor Ordering Information Separate F pin with 15 Selectable Frequencies OUT PART TEMP Single Alarm NUMBER PART V RANGE PACKAGE DD - Settable to the Second, Minute, Hour, Day of the Week, (Note) MARKING RANGE (C) (Pb-Free) Day, or Month ISL1221IUZ 1221Z 2.7V to 5.5V -40 to +85 10 Ld MSOP - Single Event or Pulse Interrupt Mode ISL1221IUZ-T* 1221Z 2.7V to 5.5V -40 to +85 10 Ld MSOP Automatic Backup to Battery or Super Cap Tape and Reel Power Failure Detection *Please refer to TB347 for details on reel specifications. NOTE: These Intersil Pb-free plastic packaged products employ On-Chip Oscillator Compensation special Pb-free material sets, molding compounds/die attach materials, 2 Bytes Battery-Backed User SRAM and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering 2 I C Interface operations). Intersil Pb-free products are MSL classified at Pb-free - 400kHz Data Transfer Rate peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 400nA Battery Supply Current Small Package Pinout - 10 Ld MSOP ISL1221 Pb-Free (RoHS Compliant) (10 LD MSOP) TOP VIEW Applications X1 V 1 10 DD Utility Meters X2 IRQ/EVDET 2 9 Set Top Box/Modem V BAT 3 8 SCL POS Equipment GND SDA 4 7 Network Routers, Hubs, Switches, Bridges Cellular Infrastructure Equipment EVIN F 5 6 OUT Fixed Broadband Wireless Equipment Test Meters/Fixtures Vending Machine Management Security and Anti Tampering Applications - Panel/Enclosure Status - Warranty Reporting - Time Stamping Applications - Patrol/Security Check (Fire or Light Equipment) - Automotive Applications FN6316 Rev 1.00 Page 1 of 24 July 15, 2010ISL1221 Block Diagram SDA SDA Seconds BUFFER 2 I C CONTROL INTERFACE Minutes SCL SCL LOGIC BUFFER Hours Day of Week X1 CRYSTAL RTC Date OSCILLATOR DIVIDER X2 Month V DD Year POR FREQUENCY ALARM OUT CONTROL V REGISTERS TRIP SWITCH USER SRAM IRQ/ INTERNAL V BAT EVDET SUPPLY F EVIN OUT GND Pin Descriptions PIN NUMBER SYMBOL DESCRIPTION 1X1 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. 2X2 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. X2 should be left open when X1 is driven from external source. 3V V This input provides a backup supply voltage to the device. V supplies power to the device in the event that BAT BAT. BAT the V supply fails. This pin should be tied to ground if not used. DD 4GND Ground. 5EVIN Event Input (EVIN). The EVIN is an input pin that is used to detect an externally monitored event. When a high signal is present at the EVIN pin an event is detected. 6F Frequency Output F , Frequency output pin, 15 selectable frequencies. Open drain output. OUT OUT 7SDA Serial Data (SDA). 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. 8SCL Serial Clock (SCL). The SCL input is used to clock all serial data into and out of the device.Open drain output. 9IRQ/EVDET Interrupt (IRQ)/Event Detect (EVDET) Output. Multi-functional pin that can be used as interrupt for Alarm and Event Detect. Open Drain Output. 10 V V Power supply. DD DD. FN6316 Rev 1.00 Page 2 of 24 July 15, 2010