STK20C04 Simtek Corporation, STK20C04 Datasheet - Page 9

• Manufacturer Part Number: STK20C04
• Description: Density = 4K ;; Format = 512 X 8 ;; # of Pins = 28 ;; Access Time (ns MAX) = 25,35,45 ;; Initiated Store = Hardware ;; Production = Now ;; Volt = 5 ;; Temps Commercial Industrial Military = C/i
• Manufacturer: Simtek Corporation

September 2003
If the STK20C04 is in a
power-up
To help avoid this situation, a 10K Ohm resistor
should be connected either between W and system
V
HARDWARE PROTECT
The STK20C04 offers two levels of protection to
suppress inadvertent
signals (E, G, W and NE) remain in the
dition at the end of a
cycle will not be started. The
will be initiated only after a transition on any one of
these signals to the required state. In addition to
multi-trigger protection,
V
STORE
CC
CC
or between E and system V
is below 4.0V, protecting against inadvertent
100
s.
80
60
40
20
0
RECALL
Figure 2: I
50
, the
STORE
STORE
SRAM
Cycle Time (ns)
CC
STORE
100
WRITE
(max) Reads
cycle, a second
data will be corrupted.
cycles. If the control
s are inhibited when
STORE
150
CC
state at the end of
.
TTL
CMOS
200
(or
STORE
RECALL
STORE
con-
)
9
LOW AVERAGE ACTIVE POWER
The STK20C04 draws significantly less current
when it is cycled at times longer than 55ns. 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 STK20C04 depends on the following items:
1)
chip enable; 3) the overall cycle rate for accesses;
4) the ratio of
temperature; 6) the V
CMOS
Document Control # ML0001 rev 0.1
CMOS
100
cycles. If the chip enable duty cycle is less
80
60
40
20
0
vs.
and
Figure 3: I
TTL
READ
TTL
50
CC
input levels; 2) the duty cycle of
= 5.5V, 100% duty cycle on chip
s to
CC
input levels (commercial tem-
Cycle Time (ns)
CC
level; and 7) I/O loading.
100
(max) Writes
WRITE
150
s; 5) the operating
CC
TTL
CMOS
and
STK20C04
200
READ
cycle