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3.3V Single-Piece 4Mb Nonvolatile SRAM
with Clock
Functional Diagram
32.768kHz
IRQ/FT
CS
CS
A0-A3
REAL-TIME
CE
V TP REF
WE
OE
CLOCK
DELAY TIMING
CIRCUITRY
UNINTERRUPTED
POWER SUPPLY
RST
V CC
CURRENT-LIMITING
RESISTOR
CHARGER
FOR THE SRAM
AND RTC
V CC
CE
V SW REF
OE
WE
SRAM
DQ0 – 7
REDUNDANT LOGIC
ML
CURRENT-LIMITING
RESISTOR
REDUNDANT
SERIES FET
GND
OE
WE
A0 – A18
BATTERY-CHARGING/SHORTING
PROTECTION CIRCUITRY (U.L. RECOGNIZED)
DS3050W
10
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