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SECTION
1
Purpose
and
Main
Features
The
7706
Battery
Backed
Byte-Wide
RAM
card provides
2,4,8,
or
16K
of
nonvolatile
RAM
with
guaranteed
data
retention time
of
two
years, typical
five
years.
For
truly
non-
volatile
operation a voltage
monitoring
circuit
senses
when
power
is
below normal
and
protects the
RAM
from spurious
writes as
power goes down,
or
comes
up.
The 7706
also
serves
as
a
flexible
general purpose
mem-
ory
card.
It
can be
mapped
to
any
16K
quadrant and
its
size
can be
tailored
to
2K
increments.
It
responds
to
the
STD
BUS
memory
expansion
line
(MEMEX)
for
two
64K memory
banks,
and an
external
Segment
Select
line
for
multiple
64K
memory
banks.
It
has
four
write
inhibit
switches which,
when
enabled, allow the
memory
to
be used
as
ROM.
Simplicity
of
design
and
popular,
high
speed, byte-wide
RAMs
are
used
for
optimum
cost effectiveness,
reliability,
and
high
speed
operation.
FEATURES
•
Operates with high speed processors such
as the
4
MHz
780A
•
Uses one
V2"
card
slot
•
2,4,8,
and
16K
byte versions
•
2 years
guaranteed
data
retention,
5 years
typical
•
Can
be
mapped
to
any
16K
quadrant
•
No
wasted
memory
space
—
unused
memory
parts
can be
disabled
• Write inhibit
switches
for
data protection
•
Processor
independent—
use with 8085,
Z80A,
6800/09,
and
others
•
Single
+5V
supply
Figure
1-1.
7706
Battery
Backed
Byte-Wide
RAM
Card
1-1
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