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