Product category:
Standard Logic Devices
News Release from: Intersil | Subject: ISL12024/25
Edited by the Electronicstalk Editorial
Team on 27 February 2007
Clock, calendar and alarm come together
Real-time clocks feature an integrated factory-set 64bit unique ID that is read-only and tamper-proof for increased security and reduced footprint and BOM cost.
Intersil's ISL12024/25 real-time clocks feature an integrated factory-set 64bit unique ID that is read-only and tamper-proof for increased security and reduced footprint and BOM cost In a tiny 8-lead package, the devices integrate a standard clock, calendar and alarm functions and also feature an I2C communication link that provides a reliable communication channel for the unique ID
This article was originally published on Electronicstalk on 8 Jan 2001 at 8.00am (UK)
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Continuing the trend towards feature integration, Intersil's micropower ISL12024/25 RTCs are suitable for both fixed and portable applications.
This level of integration benefits the customer by reducing design cost and footprint.
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The ISL12025 also adds a CPU supervisor and watchdog timer for greater BOM reduction.
With on-chip timing and crystal compensation, the devices allow tuning of the crystal frequency through the microcontroller for accurate timekeeping.
The ISL12024/25 feature automatic battery backup in the event system power is interrupted and are designed to operate with a wide range of supply voltages from 2.7 to 5.5V and in a battery back-up mode down to 1.8V.
Power consumption in either case is quite low, with typical 800nA in battery mode.
This further enhances the security and reliability of the final product by extending operation in battery mode.
The ISL12024/25 also provide 4Kbit of EEPROM with eight modes of Block Lock control.
Block Lock control allows safe, secure memory for critical user and configuration data by preventing accidental corruption of data.
The EEPROM data retention is guaranteed over 2 million write cycles.
The calendar has separate registers for date, month, year and day-of-week.
The calendar is correct through 2099, with automatic leap year correction.
The 64bit unique ID is written, verified and locked at the factory, and it is only accessible for reading and cannot be altered by the customer.
The ISL12025 has integrated power-on reset (POR) and watchdog timer functions with five selectable trip levels ranging from a default level of 2.63 to 4.64V, and has a single output for reset.
The ISL12024 has an IRQb/output pin that is software-selected to provide alarm IRQb or frequency output.
The frequency output has four frequency settings: disabled, 1, 4096 and 32,768Hz.
The alarm can be set to any clock/calendar value for a match (for example: every minute, every Tuesday or at 5:23am on 21st March).
The alarm status is available by checking the status register, or the ISL12024 device can be configured to provide an interrupt via the IRQ/frequency output pin.
There is a pulse mode for the alarms allowing for repetitive alarm functionality.
Offering high reliability, the devices feature a data retention figure of 50 years, and an endurance of 2 million cycles per byte.
With two nonvolatile alarms and a repeat mode (periodic interrupts), other key features of the devices include internal feedback resistor and compensation capacitors, 64-position digitally controlled trim capacitor, six digital frequency adjustment settings to +/-30ppm, 512 x 8bit EEPROM, 16byte page write mode (32 total pages), single byte write capability, and 400kHz data transfer rate.
Target applications for the devices include utility meters, audio video equipment, modems, network routers, hubs, switches and bridges, cellular infrastructure equipment, fixed broadband wireless equipment, pagers/PDAs, POS equipment, test meters/fixtures, office automation (copiers, fax), computer products and security-related applications.
The ISL12024 is available now in 8-lead SOIC and TSSOP packages, and the ISL12025 is available now in 8-lead SOIC and TSSOP packages.
Pb-free plus anneal is available (RoHS compliant).
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