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M41T82 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. M41T82
Description  Serial I2C bus RTC with battery switchover
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M41T82 Datasheet(HTML) 1 Page - STMicroelectronics

 
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April 2008
Rev 7
1/58
1
M41T82
M41T83
Serial I2C bus RTC with battery switchover
Features
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)
–M41T83S
VCC = 3.00 V to 5.50 V
(2.85 V
≤ VRST ≤ 3.00 V)
–M41T83R
VCC = 2.70 V to 5.50 V
(2.55 V
≤ VRST ≤ 2.70 V)
–M41T83Z
VCC = 2.38 V to 5.50 V
(2.25 V
≤ VRST ≤ 2.38 V)
Serial interface supports I2C Bus (400 kHz
protocol)
Programmable alarm with interrupt function
(valid even during battery back-up mode)
Optional 2nd programmable alarm available
Square wave output defaults to 32 KHz on
power-up (M41T83 only)
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 Super-cap™ back-up
Operating temperature of –40°C to 85°C
Package options include:
– a 16-lead QFN (M41T83),
– an 18-lead embedded crystal SOIC
(M41T83), or
– an 8-lead SOIC (M41T82)
RoHS compliance: lead-free components are
compliant with the RoHS directive
SOX18 (MY, 18-pin, 300 mil SOIC
QFN16, 4 mm x 4 mm (QA)
SO8 (M)
1
18
with embedded crystal)
(VFQFPN16)
www.st.com


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