M48T08_07 Datasheet, PDF (1/30 Pages) STMicroelectronics – 5V, 64Kbit (8 Kb x 8) TIMEKEEPER® SRAM

M48T08
M48T08Y, M48T18
5V, 64Kbit (8 Kb x 8) TIMEKEEPER^® SRAM
Features
■ Integrated ultra low power sram, real time
clock, power-fail control circuit, and battery
■ BYTEWIDE™ RAM-like clock access
■ BCD coded year, month, day, date, hours,
minutes, and seconds
■ Typical clock accuracy of ±1 minute a month, at
25°C
■ Automatic power-fail chip deselect and write
protection
■ Write protect
V_PFD = Power-fail deselect voltage):
– M48T08: V_CC = 4.75 to 5.5V
4.5V ≤ V_PFD ≤ 4.75V
– M48T18/T08Y: V_CC = 4.5 to 5.5V
4.2V ≤ V_PFD ≤ 4.5V
■ Software controlled clock calibration for high
accuracy applications
■ Self-contained battery and crystal in the
CAPHAT™ dip package
■ Packaging includes a 28-lead SOIC and
SNAPHAT^® top (to be ordered separately)
■ SOIC package provides direct connection for a
snaphat top which contains the battery and
crystal
■ Pin and function compatible with DS1643 and
JEDEC standard 8K x8 SRAMs
■ RoHS compliant
– Lead-free second level interconnect
28
1
PCDIP28 (PC)
battery/crystal
CAPHAT
SNAPHAT (SH)
battery/crystal
28
1
SOH28 (MH)
July 2007
Rev 8
1/30
www.st.com
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