STK11C68-CF25 SIMTEK [Simtek Corporation], STK11C68-CF25 Datasheet - Page 9

• Manufacturer Part Number: STK11C68-CF25
• Description: 8Kx8 SoftStore nvSRAM
• Manufacturer: SIMTEK [Simtek Corporation]

Document Control #ML0007 Rev 0.3
Internally,
the
tile information is transferred into the
After the t
be ready for
RECALL
Nonvolatile Elements. The nonvolatile data can be
recalled an unlimited number of times.
POWER-UP RECALL
During power up, or after any low-power condition
(V
latched. When V
voltage of V
be initiated and will take t
If the STK11C68 is in a
power-up
To help avoid this situation, a 10K Ohm resistor
should be connected either between W and system
V
CC
CC
SRAM
or between E and system V
February, 2007
< V
100
80
60
40
20
0
operation in no way alters the data in the
RESET
RECALL
RECALL
data is cleared, and second, the nonvola-
RECALL
SWITCH
), an internal
Figure 2: I
READ
cycle time the
, a
CC
50
, the
is a two-step procedure. First,
once again exceeds the sense
RECALL
and
SRAM
Cycle Time (ns)
CC
100
WRITE
RESTORE
(max) Reads
WRITE
RECALL
cycle will automatically
data will be corrupted.
SRAM
150
CC
to complete.
state at the end of
.
TTL
CMOS
operations. The
request will be
will once again
200
SRAM
cells.
9
HARDWARE PROTECT
The STK11C68 offers hardware protection against
inadvertent
conditions. When V
operations are inhibited.
LOW AVERAGE ACTIVE POWER
The STK11C68 draws significantly less current
when it is cycled at times longer than 50ns. Figure 2
shows the relationship between I
time. Worst-case current consumption is shown for
both
perature range, V
enable). Figure 3 shows the same relationship for
WRITE
than 100%, only standby current is drawn when the
chip is disabled. The overall average current drawn
by the STK11C68 depends on the following items:
1)
chip enable; 3) the overall cycle rate for accesses;
4) the ratio of
temperature; 6) the V
CMOS
CMOS
100
STK11C68 (SMD5962–92324)
80
60
40
20
cycles. If the chip enable duty cycle is less
0
vs.
and
STORE
Figure 3: I
TTL
READ
50
TTL
CC
input levels; 2) the duty cycle of
= 5.5V, 100% duty cycle on chip
CC
s to
operation during low-voltage
input levels (commercial tem-
cc
Cycle Time (ns)
CC
100
< V
level; and 7) I/O loading.
WRITE
(max) Writes
SWITCH
150
s; 5) the operating
TTL
CMOS
, software
CC
and
200
READ
STORE
cycle