M48T35 Datasheet, PDF (1/18 Pages) STMicroelectronics – 256 Kbit 32Kb x8 TIMEKEEPER SRAM

M48T35
M48T35Y
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 FREQUENCY TEST OUTPUT for REAL TIME
CLOCK
s AUTOMATIC POWER-FAIL CHIP DESELECT
and WRITE PROTECTION
s WRITE PROTECT VOLTAGES
(V_PFD = Power-fail Deselect Voltage):
– M48T35: 4.5V ≤ V_PFD ≤ 4.75V
– M48T35Y: 4.2V ≤ V_PFD ≤ 4.5V
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
SNAPHAT (SH)
Battery
28
1
SOH28 (MH)
28
1
PCDIP28 (PC)
Battery CAPHAT
Figure 1. Logic Diagram
VCC
15
A0-A14
8
DQ0-DQ7
Table 1. Signal Names
A0-A14
Address Inputs
DQ0-DQ7
Data Inputs / Outputs
E
Chip Enable
G
Output Enable
W
Write Enable
V_CC
Supply Voltage
V_SS
Ground
W
M48T35
M48T35Y
E
G
VSS
AI01620B
February 2000
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