M48T35_0708 Datasheet, PDF (1/29 Pages) STMicroelectronics – 5V, 256 Kbit (32 Kb x 8) TIMEKEEPER SRAM

M48T35
M48T35Y
5V, 256 Kbit (32 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
■ Frequency test output for real time clock
■ Automatic power-fail chip deselect and WRITE
protection
■ WRITE protect voltages
(V_PFD = Power-fail Deselect Voltage):
– M48T35: V_CC = 4.75 to 5.5V
– 4.5V ≤ V_PFD ≤ 4.75V
– M48T35Y: V_CC = 4.5 to 5.5V
– 4.2V ≤ V_PFD ≤ 4.5V
■ Self-contained battery and crystal in the
CAPHAT™ DIP package
■ SOIC package provides direct connection for a
SNAPHAT^® housing containing the battery and
crystal
■ SNAPHAT^® housing (battery and crystal) is
replaceable
■ Pin and function compatible with JEDEC
standard 32 Kb x 8 SRAMs
■ RoHS compliant
– Lead-free second level interconnect
28
1
PCDIP28 (PC)
Battery/Crystal
CAPHAT
SNAPHAT (SH)
Battery/Crystal
28
1
SOH28 (MH)
August 2007
Rev 7
1/29
www.st.com
1