DATASHEET ISL1208 FN8085 Rev 9.0 2 I C Real Time Clock/Calendar, Low Power RTC with Battery Backed SRAM Jul 21, 2021 The ISL1208 device is a low power real time clock with Features timing and crystal compensation, clock/calendar, power fail Real Time Clock/Calendar indicator, periodic or polled alarm, intelligent battery backup - Tracks Time in Hours, Minutes, and Seconds switching and battery-backed user SRAM. - Day of the Week, Day, Month, and Year The oscillator uses an external, low-cost 32.768kHz crystal. 15 Selectable Frequency Outputs The real time clock tracks time with separate registers for Single Alarm hours, minutes, and seconds. The device has calendar registers for date, month, year and day of the week. The - Settable to the Second, Minute, Hour, Day of the Week, Day, or Month calendar is accurate through 2099, with automatic leap year correction. - Single Event or Pulse Interrupt Mode Automatic Backup to Battery or Super Capacitor Applications Power Failure Detection Utility Meters On-Chip Oscillator Compensation HVAC Equipment 2 Bytes Battery-Backed User SRAM Audio/Video Components 2 I C Interface Set-Top Box/Television - 400kHz Data Transfer Rate Modems 400nA Battery Supply Current Network Routers, Hubs, Switches, Bridges Same Pin Out as ST M41Txx and Maxim DS13xx Devices Cellular Infrastructure Equipment Small Package Options Fixed Broadband Wireless Equipment - 8 Ld MSOP and SOIC Packages Pagers/PDA - 8 Ld TDFN Package POS Equipment Pb-Free Available (RoHS Compliant) Test Meters/Fixtures Office Automation (Copiers, Fax) Home Appliances Computer Products Other Industrial/Medical/Automotive 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 ALARM OUT CONTROL V REGISTERS TRIP SWITCH USER SRAM IRQ/ INTERNAL V BAT F OUT SUPPLY FIGURE 1. Block Diagram FN8085 Rev 9.0 Page 1 of 23 Jul 21, 2021 2004 Renesas ElectronicsISL1208 . Ordering Information PACKAGE DESCRIPTION CARRIER TYPE PART NUMBER PART MARKING V RANGE (V) (RoHS Compliant) PKG. DWG. (Note 1) TEMP. RANGE DD ISL1208IU8Z ANW 2.7 to 5.5 8 Ld MSOP M8.118 Tube -40 to +85C ISL1208IU8Z-TK Reel, 2.5k ISL1208IU8Z-T7A Reel, 250 ISL1208IB8Z 1208 ZI 8 Ld SOIC M8.15E Tube ISL1208IB8Z-TK Reel, 1k ISL1208IB8Z-T7A Reel, 250 ISL1208IRT8Z 08TZ 8 Ld TDFN L8.3x3A Tube ISL1208IRT8Z-TK Reel, 1k NOTES: 1. See TB347 for details about reel specifications. 2. These Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), see the ISL1208 device page. For more information about MSL, see TB363 Pinouts ISL1208 ISL1208 (8 LD MSOP, SOIC) (8 LD TDFN) TOP VIEW TOP VIEW X1 1 8 VDD X1 VDD 1 8 2 7 X2 IRQ/FOUT X2 2 7 IRQ/FOUT VBAT 3 6 SCL VBAT SCL 3 6 GND 4 5 SDA GND 4 5 SDA 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. 3 VBAT This input provides a backup supply voltage to the device. V supplies power to the device in the event that the V supply 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 IRQ/FOUT Interrupt Output/Frequency Output is a multi-functional pin that can be used as interrupt or frequency output pin. The function is set via the configuration register. 8 VDD Power supply FN8085 Rev 9.0 Page 2 of 23 Jul 21, 2021