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STK22C48S35 Scheda tecnica(PDF) 9 Page - List of Unclassifed Manufacturers

Il numero della parte STK22C48S35
Spiegazioni elettronici  2K x 8 AutoStore??nvSRAM QuantumTrap??CMOS Nonvolatile Static RAM
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Produttore elettronici  ETC1 [List of Unclassifed Manufacturers]
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STK22C48
December 2002
9
Document Control # ML0004 rev 0.0
will stop trying to pull HSB low and abort the STORE
attempt.
HARDWARE PROTECT
The STK22C48 offers hardware protection against
inadvertent STORE operation and SRAM WRITEs dur-
ing low-voltage conditions. When V
CAP < VSWITCH, all
externally initiated STORE operations and SRAM
WRITE
s are inhibited.
AutoStore™ can be completely disabled by tying
V
CCX to ground and applying + 5V to VCAP . This is the
AutoStore™ Inhibit mode; in this mode STOREs are
only initiated by explicit request using the HSB pin.
LOW AVERAGE ACTIVE POWER
The STK22C48 draws significantly less current
when it is cycled at times longer than 50ns. Figure 5
shows the relationship between I
CC and READ cycle
time. Worst-case current consumption is shown for
both CMOS and TTL input levels (commercial tem-
perature range, V
CC = 5.5V, 100% duty cycle on chip
enable). Figure 6 shows the same relationship for
WRITE
cycles. If the chip enable duty cycle is less
than 100%, only standby current is drawn when the
chip is disabled. The overall average current drawn
by the STK22C48 depends on the following items:
1) CMOS vs. TTL input levels; 2) the duty cycle of
chip enable; 3) the overall cycle rate for accesses;
4) the ratio of READs to WRITEs; 5) the operating
temperature; 6) the Vcc level; and 7) I/O loading.
Figure 5: Icc (max) Reads
0
20
40
60
80
100
50
100
150
200
Cycle Time (ns)
TTL
CMOS
Figure 6: Icc (max) Writes
0
20
40
60
80
100
50
100
150
200
Cycle Time (ns)
TTL
CMOS


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