Serial real-time clock (RTC) ICs

RTC ICs spectrum Widest portfolio of real-time clocks offers unlimited designs solutions An extended variety of products with the newest technology innovations are available including ultralow-power devices, the world’s smallest package with embedded crystal, ST’s SNAPHAT® with battery and crystal integrated. RTC functions include alarm, battery switchover, reset, and special features with time stamp, anti-tamper for secure applications, audio, and trickle charge, and an highly-accurate temperature-compensated RTC with embedded crystal. Low-power for portable devices • ow standby current L •...

Low-power RTC ICs Very low standby current extends battery backup life Special low-power RTC series available in small packages, from 350 nA, with battery switchover, and with or without an embedded crystal to best fit battery-operated device constraints. • CD registers for year, month, day, date, B hours, minutes and seconds • century bits (Y2.1 K compliant) 2 • ortable media players P • utomatic leap year adjustment A max VCC suitable for lithium-ion battery operation Application examples • scillator fail detect O • est equipment T • ortable navigation P • rogrammable watchdog output P Low-power...

World’s smallest RTC with embedded crystal M41T62LC6F • TC in LCC8 package with R embedded crystal • rogrammable alarm with repeat modes P • rogrammable watchdog timer P • 62.5 • rogrammable square-wave output P • 1 M41T62 Year Month Day Date Hours Minutes Seconds 0.1 Seconds 0.01 Seconds Century bits Alarm Watchdog Out Oscillator fail detect OFIE Square wave Calibration IRQ/OUT (Open drain) SQW

Enhanced industry-standard Class-leading RTCs for smart utility meters and precision applications Enhanced industry-standard RTC with fixed reference added for highly-reliable battery switchover threshold, plus analog calibration, embedded crystal and oscillator fail detect. Highly accurate, automatic temperature-compensated real-time clock solution with embedded crystal More applications now require very accurate timekeeping across a wide range of temperature. Multi-rate smart power metering is a typical example,since power companies need to log multi-rate electricity usage for accurate billing....

M41T00S Year Automatic Month battery Day switchover Date and write protect Hours Minutes Reference Seconds VPFD = 2.6 V Century bits Calibration 400 KHz Out I²C Oscillator interface fail detect 32 KHz oscillator • recision reference for battery P switchover threshold • scillator fail detect circuit O • 00 kHz I2C interface 4 • utomatic battery switchover A • alibration register - accuracy to C • CD registers: century, year, month, day, B date, hours, minutes, seconds • .7 to 5.5 V operation 2 • utomatic leap year adjustment A FT/OUT/ OSC-FAIL-IRQ • ntegrated backup battery and I • TC with integrated...

Real-time clocks with analog calibration M41T83, M41T93 • Analog calibration • 5 ppm typical at 25 °C after two reflows • Real-time feedback • Pre-programmed in OTP byte (only in SOX18) • Digital calibration Automatic battery switchover and write protect Reference VPFD (VRST) = 2.6 V Battery monitor • Automatic battery switchover and write-protect bytes shared with 2 alarm registers • programmable alarms with repeat modes 2 • emory-mapped BCD year, month, day, M date, hours, minutes, seconds, 10ths, 100ths of seconds down to 1.8 V (VRST) options: • 2.93 VPFD @ 3.0 to 5.5 VCC • 2.63 VPFD @ 2.7...

Long-life battery backup Application examples • ome multimedia H 48 mAh battery 12 years backup life M41T56 battery backup • etering (gas, electricity, water) M • ulti-function printers M • ackup life t = battery capacity / battery current B • ehicle tracking systems V • 41T56 backup current IBAT = 450 nA (typical) M • ackup life t = BR1225 capacity / IBAT B VBAT BR1225 Li coin cell • ackup life t = 12.2 years B Enhanced industry-standard RTCs portfolio Battery switchover Oscillator fail detect Programmable alarms Square wave output Power-up output frequency (kHz) Watchdog timer Power on Reset/low...

Highly-integrated RTC Combined RTC and Microprocessor supervisor Highly-integrated RTCs with NVRAM and a large set of microprocessor supervisory functions, including battery monitor, power-on reset and low-voltage detect. • utomatic battery switchover A • ower-fail detect and write-protect P • rogrammable square-wave output P • 1 Microprocessor supervisor functions Power-fail detect and write Power-fail protect Threshold 1: VPFD = 4.40 V 0: VPFD = 2.65 V WDI • ower-on reset/low-voltage detect P • rogrammable watchdog P Battery monitor • 4 bytes of NVRAM 4 • rogrammable alarm with repeat mode...

Microprocessor supervisor functions NVRAM supervisor features • arly power-fail warning (PFI/PFO) E • utomatic battery switchover and A • ower-on reset/low-voltage detect P • 8-lead SNAPHAT® IC (SOH28) 2 • 8-lead embedded crystal SOIC (SOX28) 2 • perating temperature: -40 to +85 °C O • 4 bytes of NVRAM 4 external LPSRAM • rogrammable alarm with repeat mode P SOX28 Embedded crystal (internal view) • rogrammable square-wave output P • 1 Battery backup switchover Battery monitor Power-fail deselect and write protect Power-on reset/low-voltage detect Push-button reset Watchdog reset Early power-fail...

Securitizor Combined real-time clock (RTC) IC including microprocessor supervisor, NVRAM supervisor, with physical tamper detect, plus internal and external RAM clear for secure applications. NVRAM supervisor features Tamper circuit features • 4-bit unique serial number 6 • wo independent inputs detect circuit T • ower-fail write protect P • urns LPSRAM into NVRAM T opening or closing. Options on alarm: interrupt • Clear internal RAM • Clear external RAM • Store event time (always) • Output reset • Generate • 8-lead embedded crystal IC 2 • ounters for 10ths and 100ths of seconds, C • amper detect...