M41T93 Datasheet, PDF (1/49 Pages) STMicroelectronics – Serial SPI bus RTC with battery switchover

M41T93
Serial SPI bus RTC with battery switchover
Preliminary Data
Feature summary
■ 2.0 to 5.5V clock operating voltage
■ Ultra-low battery supply current of 365nA
■ Counters for tenths/hundredths of seconds,
seconds, minutes, hours, day, date, month,
year, and century
■ Programmable clock calibration (analog and
digital)
■ Automatic switch-over and reset output
circuitry (fixed reference)
– M41T93S: V_CC = 3.0V to 5.5V
(2.85V ≤V_RST ≤3.00V)
– M41T93R: V_CC = 2.7V to 5.5V
(2.55V ≤V_RST ≤2.70V)
– M41T93Z: V_CC = 2.38V to 5.50V
(2.25V ≤V_RST ≤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 2^nd 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
QFN16, 4mm x 4mm (QA)
18
1
SOX18 (MY, 18-pin, 300mil SOIC
with Embedded Crystal)
■ 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.
August 2006
Rev 1
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
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