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ST Microelectronics - 256 Kbit 32Kb x8 TIMEKEEPER SRAM

Numéro de référence M48T35AY
Description 256 Kbit 32Kb x8 TIMEKEEPER SRAM
Fabricant ST Microelectronics 
Logo ST Microelectronics 





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M48T35AY fiche technique
M48T35AY
M48T35AV
256 Kbit (32Kb x8) TIMEKEEPER® SRAM
s INTEGRATED ULTRA LOW POWER SRAM,
REAL TIME CLOCK, POWER-FAIL CONTROL
CIRCUIT and BATTERY
s BYTEWIDE™ RAM-LIKE CLOCK ACCESS
s BCD CODED YEAR, MONTH, DAY, DATE,
HOURS, MINUTES and SECONDS
s BATTERY LOW FLAG (BOK)
s FREQUENCY TEST OUTPUT for REAL TIME
CLOCK
s AUTOMATIC POWER-FAIL CHIP DESELECT
and WRITE PROTECTION
s WRITE PROTECT VOLTAGES
(VPFD = Power-fail Deselect Voltage):
– M48T35AY: 4.2V VPFD 4.5V
– M48T35AV: 2.7V VPFD 3.0V
s SELF-CONTAINED BATTERY and CRYSTAL
in the CAPHAT DIP PACKAGE
s SOIC PACKAGE PROVIDES DIRECT
CONNECTION for a SNAPHAT HOUSING
CONTAINING the BATTERY and CRYSTAL
s SNAPHAT® HOUSING (BATTERY and
CRYSTAL) is REPLACEABLE
s PIN and FUNCTION COMPATIBLE with
JEDEC STANDARD 32Kb x8 SRAMs
DESCRIPTION
The M48T35AY/35AV TIMEKEEPER® RAM is a
32Kb x8 non-volatile static RAM and real time
clock. The monolithic chip is available in two spe-
cial packages to provide a highly integrated bat-
tery backed-up memory and real time clock
solution.
The M48T35AY/35AV is a non-volatile pin and
function equivalent to any JEDEC standard 32Kb
x8 SRAM. It also easily fits into many ROM,
EPROM, and EEPROM sockets, providing the
non-volatility of PROMs without any requirement
for special write timing or limitations on the number
of writes that can be performed.
SNAPHAT (SH)
Battery/Crystal
28
1
SOH28 (MH)
28
1
PCDIP28 (PC)
Battery/Crystal
CAPHAT
Figure 1. Logic Diagram
VCC
15
A0-A14
8
DQ0-DQ7
W M48T35AY
M48T35AV
E
G
VSS
AI02797B
May 2000
1/19

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