Features
 Ultra-low battery supply current of 365 nA
 Factory calibrated accuracy ±5 ppm typical
after 2 reflows (SOX18) (much better
accuracies are achievable using built-in
programmable analog and digital calibration
circuits)
 2.0 V to 5.5 V clock operating voltage
 Counters for tenths/hundredths of seconds,
seconds, minutes, hours, day, date, month,
year, and century
 Automatic switchover and reset output circuitry
(fixed reference):
M41T93S: VCC = 3.0 V to 5.5 V;
M41T93R: VCC = 2.7 V to 5.5 V;
M41T93Z: VCC = 2.38 V to 5.50 V
 Compatible with SPI bus serial interface
(supports SPI mode 0 [CPOL = 0, CPHA = 0])
 Programmable alarm with interrupt function
(valid even during battery backup mode)
 Optional 2nd programmable alarm available
 Square wave output (defaults to 32 KHz on
power-up)
 RESET (RST) output
 Watchdog timer
 Programmable 8-bit counter/timer
 7 bytes of battery-backed user SRAM
 Battery low flag
 Low operating current of 80 μA
 Oscillator stop detection
 Battery or supercapacitor backup
 Operating temperature of –40 °C to +85 °C
 Package options include a 16-lead QFN and an
18-lead embedded crystal SOIC