M41T83(2008) 查看數據表（PDF） - STMicroelectronics

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M41T83
(Rev.:2008)

Serial I2C bus RTC with battery switchover

STMicroelectronics 

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

QFN16, 4 mm x 4 mm (QA)

(VFQFPN16)

18

1

SOX18 (MY, 18-pin, 300 mil SOIC

with embedded crystal)

SO8 (M)

■ 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

April 2008

Rev 7

1/58

www.st.com

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