X20C05D-35 View Datasheet(PDF) - Xicor -> Intersil
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X20C05D-35 Datasheet PDF : 19 Pages
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X20C05
AUTOSTORE Feature
The AUTOSTORE feature automatically saves the con-
tents of the X20C05’s RAM to the on-board bit-for-bit
shadow E2PROM at power-down. This circuitry insures
that no data is lost during accidental power-downs or
general system crashes, and is ideal for microprocessor
caching systems, embedded software systems, and
general system back-up memory.
The AUTOSTORE instruction (EAS) to the SDP register
sets the AUTOSTORE enable latch, allowing the X20C05
AUTOSTORE CYCLE Timing Diagrams
to automatically perform a store operation whenever VCC
falls below the AUTOSTORE threshold (VASTH). VCC
must remain above the AUTOSTORE Cycle End Volt-
age (VASEND) for the duration of the store cycle (tASTO).
The detailed timing for this feature is illustrated in the
AUTOSTORE timing diagram, below. Once the
AUTOSTORE cycle is initiated, all other device functions
are inhibited.
5
VCC
4
AUTOSTORE CYCLE IN PROGRESS VASTH
VASEND
3
2 tASTO
1
STORE TIME
TIME (ms)
VASTH
0V
AS
VCC
tPUR tASTO
tPUR
3827 FHD F14
AUTOSTORE CYCLE LIMITS
Symbol
tASTO
VASTH
VASEND
Parameter
AUTOSTORE Cycle Time
AUTOSTORE Threshold Voltage
AUTOSTORE Cycle End Voltage
Min.
4.0
3.5
X20C05
Max.
2.5
4.3
Units
ms
V
V
3827 PGM T15
12
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