Serial real-time clock ICs Content RTC ICs spectrum................................................................................ 3 Low-power RTC ICs............................................................................ 4 World’s smallest RTC with embedded crystal........................................ 4 Enhanced industry-standard real-time clocks .................. 5 Real-time clocks with analog calibration............................................... 6 Highly-integrated RTC...................................................................... 8 Securitizor RTC with physical tamper detect......................................... 9 Package options....................................................................................... 11 Design support.................................................................................... 12 RTC ICs spectrum Widest portfolio of real-time clocks offers unlimited design solutions An extended variety of products with the newest technology innovations are available including ultra low-power devices, the world’s smallest package with embedded crystal, and ST’s SNAPHAT’s with battery and crystal integrated. RTC functions include alarm, battery switchover, reset, and special features such as time stamp, anti-tamper for secure applications and audio. Low-power for portable devices Enhanced industry-standard • Low standby current • Automatic battery switchover • World’s smallest RTC • Analog calibration with embedded crystal • Embedded crystal • Small packages M41T6x series Highly-integrated • RTC with NVRAM and microprocessor supervisor functions • Securitizor RTC with physical tamper detect M41T81S, M41T00S, M41T01, M41T80, M41T11 M41T82/83/93, M41T00CAP M41ST85W, M41T94, M41T00AUD, M41ST87W 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. Application examples 3 mm • Digital cameras • Point-of-sale terminals • Portable media players • Test equipment • Medical instruments • Portable navigation M41 T6x 3 mm QFN16 0.90 mm Low-power RTCs for portable devices portfolio 4 Battery supply Data Supply Power-up Timekeeping Square current bus voltage Part Oscillator Programmable Watchdog output Embedded Package (I ) wave number type faildetect alarms timer frequency crystal BAT output (KHz) typ 400 kHz min min (V) (nA) max (V) M41T60 QFN16 350 I2C 1.3 - 4.4 1 •1 - - - - - QFN16 350 I2C 1.3 - 4.4 1 •1 •1 •1 • 32 - LCC8 350 I2C 1.3 - 4.4 1 1 • • • 1 • 32 • M41T63 QFN16 350 I2C 1.3 - 4.4 1 • - • • 32 - M41T64 QFN16 350 I2C 1.3 - 4.4 1 • - • • 32 - M41T65 QFN16 350 I2C 1.3 - 4.4 1 •1 •1 • - - - M41T66 QFN16 525 I2C 1.5 - 4.4 1 •1 •1 •1 • 32 - M41T62 1 Note: 1: With IRQ output World’s smallest RTC with embedded crystal M41T62LC6F • RTC in LCC8 package with embedded • Programmable watchdog timer • 10ths and 100ths of seconds • Programmable square-wave output crystal • Programmable alarm with repeat modes and interrupt function •62.5 •1 ms to 31 min Hz to 32 KHz 1.5 mm 3.2 mm LCC8 Enhanced industry-standard Class-leading RTCs for 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. Application examples • Home multimedia • Multi-function printers • Metering (gas, electricity, water) • Vehicle tracking systems M41T00S M41T00CAP • Precision reference for battery switchover threshold • Integrated backup battery and • Oscillator fail detect circuit • 400 kHz I C interface 2 • Automatic battery switchover and write-protect • Calibration register - accuracy to 5 seconds per month • BCD registers: century, year, month, day, date, hours, minutes, seconds embedded crystal • Based on M41T00S RTC • CAPHAT™ PCDIP24 package • 0 to 70 °C operation • Up to 10 years of timekeeping without system power • 2.7 to 5.5 V operation • Automatic leap year adjustment • SO8 package PCDIP24 CAPHAT™ Embedded crystal + battery (internal view) 5 M41T81S • Programmable alarm with repeat • BCD registers: century, year, month, • Oscillator fail detect circuit • 400 kHz I2C interface • Battery monitor • Programmable watchdog modes • Automatic battery switchover and write-protect with precision reference • Calibration register - accuracy to 5 seconds per month day, date, hours, minutes, seconds •62.5 ms to 128 s time-out • Programmable square-wave •1 Hz to 32 KHz • Automatic leap year adjustment SOX18 Embedded crystal (Internal view) SO8 M41T83, Real-time clocks with analog calibration • Factory-calibrated accuracy of ±5 • 2 programmable alarms with repeat • Analog calibration allows • Memory-mapped BCD year, month, ppm typical after 2 reflows (SOX18) in-application calibration • 365 nA standby (typ) at 3.0 V • Automatic battery switchover and write-protect with precision reference reference •Precision • 400 kHz I2C, 10 MHz SPI • 12 bytes of NVRAM •5 bytes shared with 2 alarm registers 6 4 mm modes day, date, hours, minutes, seconds, 10ths, 100ths of seconds M41 T83 0.90 mm 4 mm QFN16 • 2.38 to 5.5 V operation •Timekeeping down to 1.8 V • Programmable watchdog (62.5 ms to 128 s) • Programmable squarewave output •1 Hz to 32 KHz SOX18 Embedded crystal (internal view) Timekeeping min (V) Battery switchover Oscillator fail detect Programmable alarms Square wave output Power-up output frequency (KHz) Watchdog timer Battery low detect Power on Reset/low voltage detector output Embedded crystal Temperature compensated Enhanced industry-standard RTCs portfolio M41T0 SO-8 900 - I²C2 2 - 5.5 2 - • - - - - - - - - M41T00S SO-8 600 - I²C 2.7 - 5.5 2 • 5 • - - - - - - - - M41T01 SO-8 800 - I²C 2 - 5.5 2.5 • - - • - - - - - - DFN16 600 - I²C 3 - 3.6 1.7 • 5 • 3 - - - - - - - - - - I²C 2.7 - 5.5 - • 5 • - - - - - - • - SO-8 800 56 I²C 2 - 5.5 2 • - - - - - - - - - SOH-28 800 56 I²C 2 - 5.5 2 • - - - - - - - - - M41T56 SO-8 450 56 I²C 4.5 - 5.5 2.5 • - - - - - - - - - M41T80 SO-8 1500 - I²C 2 - 5.5 2 - - • • 32 - - - - - SO-8 600 - I²C 2.7 - 5.5 2 • 5 • • • - • • - - - SOX-18 600 - I²C 2.7 - 5.5 2 • 5 • 3 • • - • • - • - SO-8 365 12 I²C 2.38 - 5.5 1.8 • 5 • - - - - • • - - QFN16 365 12 I²C 2.38 - 5.5 1.8 • 5 • • • 32 • • • - - SOX-18 365 12 I²C 2.38 - 5.5 1.8 • 5 • • • 32 • • • • QFN16 365 12 SPI 2.38 - 5.5 1.8 • 5 • • • 32 • • • - SOX-18 365 12 SPI 2.38 - 5.5 1.8 • 5 • • • 32 • • • • Package Part number Battery supply NVRAM current size Data (Ibat) bus type typ (nA) (bytes) M41T00AUD M41T00CAP PCDIP24 1 M41T11 M41T81S M41T82 M41T83 M41T93 Note: 1: Integrated battery and embedded crystal 2: 400 kHz 3: With IRQ output 4: Dedicated output 5: Fixed switchover reference 6: 10 MHz 2 2 2 2 2 2 2 2 2 2 6 6 VCC min - max (V) 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 4 4 4 4 4 3 3 3 3 3 3 - 7 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. Application examples • Servers • Vending machines • Medical equipment • Gaming • Point of sales M41T94 • Automatic battery switchover • Power-fail detect and write-protect • 2 MHz SPI bus • THS pin selects 5 or 3/3.3 V operation 8 • 400 nA standby (typ) at 3.0 V • 44 bytes of NVRAM 94 M41T SO16 SNAPHAT battery top SOH28 • Programmable alarm with repeat mode • Programmable square-wave output •1 Hz to 32 KHz • 10ths and 100ths of seconds M41ST85W • 400 kHz I2C • 400 nA standby (typ) at 3.0 V • 2.7 to 3.6 V • 28-lead SNAPHAT® IC (SOH28) SNAPHAT battery top • 28-lead embedded crystal SOIC (SOX28) • Operating temperature: -40 to +85 °C • 44 bytes of NVRAM • Programmable alarm with repeat mode • Programmable square-wave output •1 Hz to 32 KHz • 10ths and 100ths of seconds 8 SOH2 SOH28 SNAPHAT IC SOX28 Embedded crystal (internal view) SECURITIZOR RTC WITH PHYSICAL TAMPER DETECT Combined real-time clock (RTC) IC including microprocessor supervisor, NVRAM supervisor, with physical tamper detect, plus internal and external RAM clear for secure applications. Application examples • Black boxes • Gaming machines • Closed-circuit TV • Fire alarms • Financial security: ATM, cash, • Metering (gas, electricity, water) registers, POS, card readers M41ST87W • 64-bit unique serial number • Programmable square-wave output •1 • -40 to +85 °C Hz to 32 KHz • Dedicated 32 KHz output • 3 V, 3.3 V, 5 V operation • Microprocessor supervisor • 500 nA standby (typ) at 3.0 V SOX28 Embedded crystal (internal view) • NVRAM supervisor • 28-lead embedded crystal IC • Tamper detect functions • Counters for 10ths and 100ths of seconds, seconds, minutes, hours, day, date, month, year, and century • 128 bytes of clearable NVRAM • Programmable alarm with repeat modes functions in battery-backed mode 9 Oscillator fail detect Programmable alarms Square wave dedicated output Power-up output frequency (KHz) Watchdog timer Battery low detect Power on Reset/low voltage detector output Power fail comparator Reset inputs Embedded crystal SOX-28 400 44 I²C2 2.7 - 3.6 •4 - •3 • - •3 • • • • • SOH-28 400 44 I²C 2.7 - 3.6 • - • 3 • - •3 • • • • - SSOP 20 500 128 I²C2 2.7 - 3.6 •4 •3 •3 • 32 •3 • • • • - SOX-28 500 128 I²C 2.7 - 3.6 4 • • • 3 • 32 • 3 • • • • • SO-16 400 44 SPI1 2.7 - 5.5 •4 • •3 • - •3 • • - • - SOH-28 400 44 SPI 2.7 - 5.5 • • • • - • • • - • - Package Part number Battery switchover Highly-integrated RTCs portfolio Battery supply NVRAM size Data current (Ibat) bus type typ (nA) (bytes) M41ST85W M41ST87W M41T94 Note: 1: 2 MHz 2: 400 kHz 3: With IRQ output 4: Fixed switchover reference 2 2 1 VCC min max (V) 4 4 3 3 3 SERIAL REAL-TIME CLOCKS PORTFOLIO Part number Package Package size VCC min - max (mm) (V) Ibat typ Timekeeping NVRAM Oscillator min fail detect (nA) (V) (bytes) M41T56 SO-8 3.9x4.9 4.5 - 5.5 450 2.5 56 - M41T60 QFN16 3x3x0.9 1.3 - 4.4 350 1 - Yes M41T62 LCC8 QFN16 3.2x1.5 3x3x0.9 1.3 - 4.4 350 1 - Yes M41T63 QFN16 3.0x3.0 1.3 - 4.4 350 1 - Yes M41T64 QFN16 3x3x0.9 1.3 - 4.4 350 1 - Yes M41T65 QFN16 3x3x0.9 1.3 - 4.4 350 1 - Yes M41T66 QFN16 3x3x0.9 1.5 - 4.4 525 1 - Yes M41T0 SO-8 3.9x4.9 2 - 5.5 900 2 - Yes M41T01 SO-8 3.9x4.9 2 - 5.5 800 2.5 - - M41T00AUD DFN16 5x4x0.9 3 - 3.6 600 1.7 - Yes M41T00CAP PCDIP24 17.8x 34.3 2.7 - 5.5 - - - Yes M41T00S SO-8 3.9x4.9 2.7 - 5.5 600 2 - Yes M41T11 SOH-28 SO-8 8.2x17.8 3.9x4.9 2 - 5.5 800 2 56 - 2 - - Features Crystal CAPHAT SNAPHAT M41T80 SO-8 3.9x4.9 2 - 5.5 1500 M41T81S SOX-18 SO-8 7.6x11.6 3.9x4.9 2.7 - 5.5 600 2 - Yes M41T82 SO-8 3.9x4.9 2.38 - 5.5 365 1.8 12 Yes M41T83 SOX-18 QFN16 7.6x11.6 4.0x4.0 2.38 - 5.5 365 1.8 12 Yes Crystal M41T93 SOX-18 QFN16 7.6x11.6 4.0x4.0 2.38 - 5.5 365 1.8 12 Yes Crystal M41ST85W SOH-28 SOX-28 8.2x17.7 17.9x7.6 2.7 - 3.6 400 - 44 - Crystal, SNAPHAT M41ST87W SOX-28 SSOP 20 7.6x17.9 5.3x7.2 2.7 - 3.6 500 - 128 Yes Crystal M41T94 SO-16 SOH-28 3.8x9.8 8.2x17.7 2.7 - 5.5 400 - 44 - SNAPHAT 10 0 1 Crystal SNAPHAT® tops, battery and crystal integrated Part number Package Crystal frequency nom (Hz) Battery Lithium coin cell mAh M4T28-BR12SH SNAPHAT SOIC 32768 48 M4T32-BR12SH SNAPHAT SOIC 32768 120 Package options LCC8 1.5 mm x 3.2 mm Embedded crystal SO16 3.80 mm x 9.80 mm QFN16 3 mm x 3 mm SSOP20 7.2 mm x 5.3 mm RTCVRAM N SOX28 18.01 mm x 7.67 mm Embedded crystal QFN16 4 mm x 4 mm DFN16 5 mm x 4 mm PCDIP24 CAPHAT™ 34.29 mm x 17.83 mm Self-contained battery and crystal (internal view) SO8 3.80 mm x 4.80 mm SOX18 11.61 mm x 7.62 mm Embedded crystal SOIC SNAPHAT™ Battery and crystal snap on module to order separately (internal view) SOH28 17.71 mm x 8.23 mm 11 Design support Real-time clocks application notes, technical notes, online calculators and resources Readers will find these documents helpful in understanding some of the subtleties of RTCs and what it takes to keep them running reliably. Application notes AN922 Using a super cap to back up the M41T56, M41T00, M41T11, M41T81, M41T94 and M41ST84W (16-pin) AN923 Managing century information using serial real-time clocks and TIMEKEEPER® NVRAMs AN1011 Battery technology used in NVRAM and real-time clock (RTC) products from ST AN934 How to use the digital calibration feature in Timekeeper® and serial real-time clock (RTC) products AN1012 Predicting the battery life and data retention period of NVRAMs and serial RTCs AN1879 How to use M41ST87 tamper detect and RAM clear AN1572 Power-down time-stamp function in serial real-time clocks (RTCs) AN2583 Understanding and applying the M41T00AUD real-time clock with audio AN2678 AN3060 Extremely accurate timekeeping over temperature using adaptive calibration Using the typical temperature characteristics of 32 KHz crystal to compensate the M41T83 and the M41T93 serial real-time clocks Applications guide for serial real-time clocks (RTCs) AN1019 Second Source for “SNAPHAT” by Using a Dual Footprint AN1009 “Negative Undershoot” NVRAM Data Corruption AN1336 Power-Fail Comparator for NVRAM Supervisory Devices AN1216 Implementing a periodic alarm with TIMEKEEPER® and serial real-time clocks (RTCs) AN2971 Product support at http://www.st.com/rtc • Datasheets • Serial RTC example code • RTC and NVRAM model files • Application notes • Underwriters Laboratories (UL) • Design support calculators • Clock calibration tools • Online technical support • Selector tables information @ www.st.com/calculators © STMicroelectronics - March 2014 - Printed in United Kingdom - All rights reserved The STMicroelectronics corporate logo is a registered trademark of the STMicroelectronics group of companies All other names are the property of their respective owners Order code: BRRTC0314 For more information on ST products and solutions, visit www.st.com/rtc