M41T256Y_07 Datasheet, PDF (1/30 Pages) STMicroelectronics – 256Kbit (32K x 8) serial RTC

Features
■ 5V operating voltage
■ Serial interface supports extended I²C bus
addressing (400kHz)
■ Automatic switchover and deselect circuitry
■ Power-fail deselect voltages:
– M41T256Y: V_CC = 4.5 V to 5.5V;
V_PFD = 4.2V < V_PFD < 4.5V
■ Counters for tenths/hundredths of seconds,
seconds, minutes, hours, day, date, month,
and year
■ Programmable software clock calibration
■ 32,752 bytes of general purpose RAM
■ Microprocessor power-on reset
■ Holds microprocessor in reset until supply
voltage reaches stable operating level
■ Automatic address-incrementing
■ Tamper indication circuit with time-stamp
■ Sleep mode function
■ Available in ST’s 44-lead SNAPHAT^® SOIC -
mates with ST’s removable/replaceable
SNAPHAT^® battery/crystal top (ordered
separately)
■ RoHS compliant
– Lead-free second level interconnect
M41T256Y
256Kbit (32K x 8) serial RTC
Not For New Design
SNAPHAT (SH)
crystal/battery
44
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SOH44 (MH)
November 2007
Rev 5
This is information on a product still in production but not recommended for new designs.
1/30
www.st.com
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