M41T93
Serial SPI bus RTC with battery switchover
Features
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Ultra-low battery supply current of 365 nA
Factory calibrated accuracy
±
5 ppm
guaranteed after 2 reflows (SOX18)
– Much better accuracies 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: V
CC
= 3.0 V to 5.5 V
(2.85 V
≤
V
RST
≤
3.00 V)
– M41T93R: V
CC
= 2.7 V to 5.5 V
(2.55 V
≤
V
RST
≤
2.70 V)
– M41T93Z: V
CC
= 2.38 V to 5.50 V
(2.25 V
≤
V
RST
≤
2.38 V)
Compatible with SPI bus serial interface
(supports SPI mode 0 [CPOL = 0, CPHA = 0])
Programmable alarm with interrupt function
(valid even during battery back-up mode)
Optional 2
nd
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
Power-down time stamp (HT bit)
Low operating current of 80 µA
Oscillator stop detection
Battery or SuperCap™ backup
Operating temperature of –40°C to +85°C
18
1
QFN16, 4 mm x 4 mm (QA)
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SOX18 (MY, 18-pin, 300 mil SOIC
with embedded crystal)
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Package options include:
– a 16-lead QFN or an 18-lead embedded
crystal SOIC
RoHS compliance: lead-free components are
compliant with the RoHS directive
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August 2008
Rev 4
1/51
1
STMICROELECTRONICS [ STMICROELECTRONICS ]
