STK22C48-W25 Cypress Semiconductor Corp, STK22C48-W25 Datasheet - Page 9

• Manufacturer Part Number: STK22C48-W25
• Manufacturer: Cypress Semiconductor Corp
• Type: NVSRAMr

Specifications of STK22C48-W25

• Word Size: 8b
• Organization: 2Kx8
• Density: 16Kb
• Interface Type: Parallel
• Access Time (max): 25ns
• Operating Supply Voltage (typ): 5V
• Package Type: PDIP
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• Operating Temp Range: 0C to 70C
• Pin Count: 28
• Mounting: Through Hole
• Supply Current: 85mA
• Lead Free Status / RoHS Status: Not Compliant

will stop trying to pull HSB low and abort the
attempt.
HARDWARE PROTECT
The STK22C48 offers hardware protection against
inadvertent
ing low-voltage conditions. When V
externally initiated
WRITE
AutoStore™ can be completely disabled by tying
V
AutoStore™ Inhibit mode; in this mode
only initiated by explicit request using the HSB pin.
July 1999
CCX
to ground and applying + 5V to V
100
s are inhibited.
80
60
40
20
0
STORE
Figure 5: I
50
operation and
STORE
Cycle Time (ns)
100
cc
(max) Reads
operations and
150
TTL
CMOS
SRAM WRITE
CAP
CAP
200
< V
STORE
. This is the
SWITCH
STORE
SRAM
s dur-
s are
, all
3-29
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
time. Worst-case current consumption is shown for
both
perature range, V
enable). Figure 6 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 STK22C48 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
cycles. If the chip enable duty cycle is less
80
60
40
20
0
vs.
and
TTL
Figure 6: I
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)
level; and 7) I/O loading.
cc
100
WRITE
(max) Writes
150
s; 5) the operating
TTL
CC
CMOS
and
STK22C48
200
READ
cycle