M41T6 Real-Time Clock

Serial Access Real-Time Clock with Alarms - Now Available at Digi-Key

STMicroelectronics M41T6 Real-Time Clock Many applications require date and time generation, and STMicroelectronics' real-time clocks (RTCs) provide those functions. RTCs can be implemented in software and in ASIC logic, but maintaining the clock can present added power management challenges. While low-power microcontrollers and ASICs are available, the devices still draw much more current than a dedicated RTC, and often cannot operate over a wide voltage range. A better solution is ST's M41T6x family of serial RTCs. These devices lead the way with low-current and low-voltage operation and come in a tiny QFN package. The M41T66 is the latest addition to the family. It is a serial access real-time clock with programmable alarm IRQ, 12pF crystal support, square wave and 32KHz open-drain output for handheld and battery-operated systems and capacitor backup.

  Features   Applications
  • Counters for tenths/hundredths of seconds (excluding M41T60), seconds, minutes, hours, day date, month, year, and century
  • 32KHz crystal oscillator integrating load capacitance and high crystal series resistance operation
  • Oscillator stop detection monitors clock operation
  • 1.3V to 4.4V I2C bus operating voltage
  • 12.5pF crystal support
  • Timekeeping down to 1.0V
  • 350nA timekeeping current at 3V,
    525nA at 3V (M41T66)
  • Tiny 3x3 QFN16 package
  • M41T6x family of five RTCs to cover every application
  • Battery powered applications requiring timestamp or time display
  • Long shelf-life products requiring lowest current drain
  • STB, printer
  • Glucose meter, patient monitor and medicine dispenser
  • Inventory management and handheld scanners
  • Handheld meters/testers
  • GPS, handheld digital radio
RoHS Compliant

Part Number
Part Number
Packaging Memory Size Timekeeping Current
@ 3V
M41T60Q6F 497-3906-2-ND Tape & Reel 8B 350nA 16-QFN M41T60 Datasheet
497-3906-1-ND Cut Tape
497-3906-6-ND Digi-Reel®
M41T62Q6F 497-3907-2-ND Tape & Reel 16B 350nA 16-QFN M41T62 Datasheet
497-3907-1-ND Cut Tape
497-3907-6-ND Digi-Reel®
M41T64Q6F 497-6884-2-ND Tape & Reel 16B 350nA 16-QFN M41T64 Datasheet
497-6884-1-ND Cut Tape
497-6884-6-ND Digi-Reel®
M41T65Q6F 497-3908-2-ND Tape & Reel 16B 350nA 16-QFN M41T65 Datasheet
497-3908-1-ND Cut Tape
497-3908-6-ND Digi-Reel®
M41T66Q6F 497-8377-2-ND Tape & Reel 16B 525nA 16-QFN M41T66 Datasheet
497-8377-1-ND Cut Tape
497-8377-6-ND Digi-Reel®