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STK14C88-3NF55 Folha de dados(PDF) 10 Page - List of Unclassifed Manufacturers

Nome de Peças STK14C88-3NF55
Descrição Electrónicos  32K x 8 AutoStore??nvSRAM QuantumTrap CMOS Nonvolatile StaticRAM
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STK14C88-3
November 2003
10
Document Control # ML0015 rev 0.3
To operate in this mode the HSB pin should be con-
nected together to the HSB pins from the other
STK14C88-3s. An external pull-up resistor to + 3.3V
is required since HSB acts as an open drain pull
down. The V
CAP pins from the other STK14C88-3
parts can be tied together and share a single capac-
itor. The capacitor size must be scaled by the num-
ber of devices connected to it. When any one of the
STK14C88-3s detects a power loss and asserts
HSB, the common HSB pin will cause all parts to
request a STORE cycle (a STORE will take place in
those STK14C88-3s that have been written since
the last nonvolatile cycle).
During any STORE operation, regardless of how it
was initiated, the STK14C88-3 will continue to drive
the HSB pin low, releasing it only when the STORE is
complete. Upon completion of the STORE operation
the STK14C88-3 will remain disabled until the HSB
pin returns high.
If HSB is not used, it should be left unconnected.
HARDWARE PROTECT
The STK14C88-3 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 will be inhibited.
LOW AVERAGE ACTIVE POWER
The STK14C88-3 draws significantly less current
when it is cycled at times longer than 55ns. Figure 3
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 = 3.6V, 100% duty cycle on chip
enable). Figure 4 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 STK14C88-3 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 3: Icc (max) Reads
Figure 4: Icc (max) Writes
0
10
20
30
40
50
50
100
150
200
Cycle Time (ns)
TTL
CMOS
0
10
20
30
40
50
50
100
150
200
Cycle Time (ns)
TTL
CMOS


Nº de peça semelhante - STK14C88-3NF55

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