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STK22C48-SF45I 参数 Datasheet PDF下载

STK22C48-SF45I图片预览
型号: STK22C48-SF45I
PDF下载: 下载PDF文件 查看货源
内容描述: 2Kx8自动存储的nvSRAM [2Kx8 AutoStore nvSRAM]
分类和应用: 存储内存集成电路静态存储器光电二极管
文件页数/大小: 15 页 / 229 K
品牌: SIMTEK [ SIMTEK CORPORATION ]
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STK22C48  
shows the relationship between ICC and READ cycle  
time. Worst-case current consumption is shown for  
both CMOS and TTL input levels (commercial tem-  
perature range, VCC = 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 tempera-  
HARDWARE PROTECT  
The STK22C48 offers hardware protection against  
inadvertent STORE operation and SRAM WRITEs dur-  
ing low-voltage conditions. When VCAP < VSWITCH, all  
externally initiated STORE operations and SRAM  
WRITEs are inhibited.  
AutoStore can be completely disabled by tying VCCX  
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  
ture; 6) the V level; and 7) I/O loading.  
cc  
The STK22C48 draws significantly less current  
when it is cycled at times longer than 50ns. Figure 5  
100  
80  
100  
80  
60  
60  
TTL  
CMOS  
40  
40  
TTL  
20  
20  
CMOS  
150 200  
0
0
50  
100  
Cycle Time (ns)  
Figure 5: Icc (max) Reads  
50  
100  
Cycle Time (ns)  
Figure 6: Icc (max) Writes  
150  
200  
Rev 0.3  
Document Control #ML0004  
February 2007  
10