M48T35AY_04 Datasheet, PDF (1/25 Pages) STMicroelectronics – 5.0 or 3.3V, 256 Kbit (32 Kb x8) TIMEKEEPER® SRAM

M48T35AY
M48T35AV
5.0 or 3.3V, 256 Kbit (32 Kb x8) TIMEKEEPER^® SRAM
FEATURES SUMMARY
■ 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
■ BATTERY LOW FLAG (BOK)
■ FREQUENCY TEST OUTPUT FOR REAL
TIME CLOCK
■ AUTOMATIC POWER-FAIL CHIP
DESELECT AND WRITE PROTECTION
■ WRITE PROTECT VOLTAGES
(V_PFD = Power-fail Deselect Voltage):
– M48T35AY: V_CC = 4.5 to 5.5V
4.2V ≤ V_PFD ≤ 4.5V
– M48T35AV: V_CC = 3.0 to 3.6V
2.7V ≤ V_PFD ≤ 3.0V
■ 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 32Kb x8 SRAMs
Figure 1. 28-pin, PCDIP CAPHAT™ Package
28
1
PCDIP28 (PC)
Battery/Crystal
CAPHAT
Figure 2. 28-pin SOIC Package
SNAPHAT (SH)
Battery/Crystal
28
1
SOH28 (MH)
April 2004
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