M48T08_11 Datasheet, PDF (1/31 Pages) STMicroelectronics – 5 V, 64 Kbit (8 Kb x 8) TIMEKEEPER® SRAM

M48T08
M48T08Y, M48T18
5 V, 64 Kbit (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 5.5 V;
4.5 V ≤ V_PFD ≤ 4.75 V
– M48T18/T08Y: V_CC = 4.5 to 5.5 V;
4.2 V ≤ V_PFD ≤ 4.5 V
■ 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 8 K x 8 SRAMs
■ RoHS compliant
– Lead-free second level interconnect
28
1
PCDIP28
battery/crystal
CAPHAT™
SNAPHAT^®
battery/crystal
28
1
SOH28
June 2011
Doc ID 2411 Rev 11
1/31
www.st.com
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