M41T93SMY6E datasheet(1/51 Pages) STMICROELECTRONICS

Part #	M41T93SMY6E

Description	Serial SPI bus RTC with battery switchover

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 51 page

August 2008

Rev 4

1/51

1

M41T93

Serial SPI 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)

–M41T93S: VCC = 3.0 V to 5.5 V

(2.85 V

≤ VRST ≤ 3.00 V)

–M41T93R: VCC = 2.7 V to 5.5 V

(2.55 V

≤ VRST ≤ 2.70 V)

–M41T93Z: VCC = 2.38 V to 5.50 V

(2.25 V

≤ VRST ≤ 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 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

■ 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

■ 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, 300 mil SOIC

QFN16, 4 mm x 4 mm (QA)

1

18

with embedded crystal)

www.st.com

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