M48T37Y_10 Datasheet, PDF (1/30 Pages) STMicroelectronics – 5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER® SRAM

M48T37Y
M48T37V
5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER^® SRAM
Features
■ Integrated ultra low power SRAM, real-time
clock, power-fail control circuit, and battery
■ Frequency test output for real-time clock
software calibration
■ Automatic power-fail chip deselect and WRITE
protection
■ Watchdog timer
■ WRITE protect voltage
(V_PFD = Power-fail deselect voltage):
– M48T37Y: V_CC = 4.5 to 5.5 V
4.2 V ≤ V_PFD ≤ 4.5 V
– M48T37V: V_CC = 3.0 to 3.6 V
2.7 V ≤ V_PFD ≤ 3.0 V
■ Packaging includes a 44-lead SOIC and
SNAPHAT^® top (to be ordered separately)
■ SOIC package provides direct connection for a
SNAPHAT^® top which contains the battery and
crystal
■ Microprocessor power-on reset (valid even
during battery backup mode)
■ Programmable alarm output active in the
battery backup mode
■ Battery low flag
■ RoHS compliant
– Lead-free second level interconnect
SNAPHAT^® (SH)
Battery/crystal
44
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SOH44 (MH)
44-pin SOIC
August 2010
Doc ID 7019 Rev 9
1/30
www.st.com
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