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M41T93 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. M41T93
Description  Serial SPI bus RTC with battery switchover
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M41T93 Datasheet(HTML) 1 Page - STMicroelectronics

 
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October 2007
Rev 3
1/51
51
M41T93
Serial SPI bus RTC with battery switchover
Features
Ultra-low battery supply current of 365nA
Factory calibrated accuracy
±5PPM
guaranteed after 2 reflows (SOX18)
– Much better accuracies achievable using
built-in programmable analog and digital
calibration circuits
2.0V to 5.5V clock operating voltage
Counters for tenths/hundredths of seconds,
seconds, minutes, hours, day, date, month,
year, and century
Automatic switch-over and reset output
circuitry (fixed reference)
–M41T93S: VCC = 3.0V to 5.5V
(2.85V
≤ VRST ≤ 3.00V)
–M41T93R: VCC = 2.7V to 5.5V
(2.55V
≤ VRST ≤ 2.70V)
–M41T93Z: VCC = 2.38V to 5.50V
(2.25V
≤ VRST ≤ 2.38V)
Compatible with SPI bus serial interface
(positive clock SPI modes)
Programmable alarm with interrupt function
(valid even during battery back-up mode)
Optional 2nd programmable alarm available
Square wave output (defaults to 32kHz 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 80µA
Oscillator stop detection
Battery or Super-cap™ back-up
Operating temperature of –40°C to +85°C
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
SOX18 (MY, 18-pin, 300mil SOIC
QFN16, 4mm x 4mm (QA)
1
18
with embedded crystal)
www.st.com


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