Features
- Real Time Clock/Calendar
- Tracks Time in Hours, Minutes and Seconds
- Day of the Week, Day, Month and Year
- Two Non-Volatile Alarms
- Settable on the Second, Minute, Hour, Day of the Week, Day, or Month
- Repeat Mode (Periodic Interrupts)
- Automatic Backup to Battery or SuperCap
- On-Chip Oscillator Compensation
- Internal Feedback Resistor and Compensation Capacitors
- 64 Position Digitally Controlled Trim Capacitor
- 6 Digital Frequency Adjustment Settings to ±30ppm
- 512x8-Bits of EEPROM
- 16-Byte Page Write Mode (32 total pages)
- 8 Modes of BlockLock™ Protection
- Single Byte Write Capability
- High Reliability
- Data Retention: 50 years
- Endurance: >2,000,000 Cycles Per Byte
- I2C-bus™ Interface
- 400kHz Data Transfer Rate
- 800nA Battery Supply Current
- Package Options
- 8 Ld SOIC and 8 Ld TSSOP Packages
- Pb-Free (RoHS Compliant)
ISL12027 Functional Diagram
Description
Support is limited to customers who have already adopted these products.
The ISL12027 device is a low power real time clock with timing and crystal compensation, clock/calender, power-fail indicator, two periodic or polled alarms, intelligent battery backup switching, CPU Supervisor and integrated 512x8-bit EEPROM, in 16 Byte per page format. 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. The ISL12027 and ISL12027A Power Control Settings are different. The ISL12027 uses the Legacy Mode Setting, and the ISL12027A uses the Standard Mode Setting. Applications that have VBAT > VDD will require only the ISL12027A.
Applications
- Utility Meters
- HVAC Equipment
- Audio/Video Components
- 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
| Part Number | Status | Samples | Stock | Package | Carrier Type | MOQ |
|---|---|---|---|---|---|---|
| ISL12027IB27AZ | Obsolete | N/A | In Stock | SOIC | Tube | 980 |
| ISL12027IB27AZ-T | Obsolete | N/A | In Stock | SOIC | Reel | 2500 |
| ISL12027IB27Z | Obsolete | N/A | Out of Stock | SOIC | Tube | 980 |
| ISL12027IB27Z-T | Obsolete | N/A | Out of Stock | SOIC | Reel | 2500 |
| ISL12027IB30AZ | Obsolete | N/A | In Stock | SOIC | Tube | 980 |
| ISL12027IB30AZ-T | Obsolete | N/A | In Stock | SOIC | Reel | 2500 |
| ISL12027IBAZ | Obsolete | N/A | Out of Stock | SOIC | Tube | 980 |
| ISL12027IBAZ-T | Obsolete | N/A | Out of Stock | SOIC | Reel | 2500 |
| ISL12027IBZ | Obsolete | N/A | Out of Stock | SOIC | Tube | 980 |
| ISL12027IBZ-T | Obsolete | N/A | Out of Stock | SOIC | Reel | 2500 |
| ISL12027IV27AZ | Obsolete | N/A | In Stock | TSSOP | Tube | 960 |
| ISL12027IV27AZ-T | Obsolete | N/A | In Stock | TSSOP | Reel | 2500 |
| ISL12027IV27Z | Obsolete | N/A | Out of Stock | TSSOP | Tube | 960 |
| ISL12027IV27Z-T | Obsolete | N/A | Out of Stock | TSSOP | Reel | 2500 |
| ISL12027IV30AZ | Obsolete | N/A | In Stock | TSSOP | Tube | 960 |
| ISL12027IV30AZ-T | Obsolete | N/A | Out of Stock | TSSOP | Reel | 2500 |
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- End Of Life NoticePDF 257 KB PLC16094 Oct 31, 2016
- Product Change NoticePDF 152 KB PCN12085 Nov 07, 2012
- Product Change NoticePDF 121 KB PCN11113A Aug 13, 2012
- Product Change NoticePDF 120 KB PCN11113 Oct 31, 2011
- Application NotePDF 302 KB an1549 Nov 03, 2007AI-generated Summary: Power issues in real-time clock (RTC) applications include voltage spikes during AC turn-on, power glitches, and low or no battery backup voltage. Adding a medium power Schottky diode at the RTC Vpp pin helps clamp voltage spikes. Battery backup maintains time during power loss but fast glitches can corrupt RAM. Circuit designs with resistors and MOSFETs prevent SRAM corruption during power-up. Proper filtering and power-up delays ensure reliable 12C communication and data integrity.
- Application NotePDF 364 KB an1303 Nov 18, 2005AI-generated Summary: The document compares replacing Renesas RTC models X1226, X1227, and X1228 with the ISL12026, ISL12027, and ISL12028 respectively. It details differences in battery switchover behavior, battery current consumption, reset trip voltages, EEPROM page write sizes, status and control registers, RTC register write methods, alarm functions, pin names, and clock input options. The new ISL1202x series offers lower battery current, more accurate reset thresholds, selectable I2C operation modes, and expanded functionality, with some changes requiring software adjustments.
- Manual - Development ToolsPDF 815 KB an1745 Feb 17, 2008
- DocumentPDF 302 KB tb460 Nov 18, 2005
Recommended Documents (1)
Datasheets (1)
- Manual - Development ToolsPDF 815 KB an1745 Feb 17, 2008
Manuals & Guides (1)
- Application NotePDF 302 KB an1549 Nov 03, 2007AI-generated Summary: Power issues in real-time clock (RTC) applications include voltage spikes during AC turn-on, power glitches, and low or no battery backup voltage. Adding a medium power Schottky diode at the RTC Vpp pin helps clamp voltage spikes. Battery backup maintains time during power loss but fast glitches can corrupt RAM. Circuit designs with resistors and MOSFETs prevent SRAM corruption during power-up. Proper filtering and power-up delays ensure reliable 12C communication and data integrity.
- Application NotePDF 364 KB an1303 Nov 18, 2005AI-generated Summary: The document compares replacing Renesas RTC models X1226, X1227, and X1228 with the ISL12026, ISL12027, and ISL12028 respectively. It details differences in battery switchover behavior, battery current consumption, reset trip voltages, EEPROM page write sizes, status and control registers, RTC register write methods, alarm functions, pin names, and clock input options. The new ISL1202x series offers lower battery current, more accurate reset thresholds, selectable I2C operation modes, and expanded functionality, with some changes requiring software adjustments.
Application Notes & White Papers (2)
- End Of Life NoticePDF 257 KB PLC16094 Oct 31, 2016
- Product Change NoticePDF 152 KB PCN12085 Nov 07, 2012
- Product Change NoticePDF 121 KB PCN11113A Aug 13, 2012
- Product Change NoticePDF 120 KB PCN11113 Oct 31, 2011
Product Notices (PCN, EOL, etc) (4)
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