参数资料
型号: MR256A08BSO35
厂商: Everspin Technologies Inc
文件页数: 8/24页
文件大小: 0K
描述: IC MRAM 256KB 35NS 32SOIC
标准包装: 108
格式 - 存储器: RAM
存储器类型: MRAM(磁阻 RAM)
存储容量: 256K (32K x 8)
速度: 35ns
接口: 并联
电源电压: 3 V ~ 3.6 V
工作温度: 0°C ~ 70°C
封装/外壳: 32-SOIC(0.295",7.50mm 宽)
供应商设备封装: 32-SOIC
包装: 托盘
其它名称: 819-1028
MR256A08B
Power Up and Power Down Sequencing
The MRAM is protected from write operations whenever V DD is less than V WI . As soon as V DD exceeds V DD (min),
there is a startup time of 2 ms before read or write operations can start. This time allows memory power sup-
plies to stabilize.
The E and W control signals should track V DD on power up to V DD - 0.2 V or V IH (whichever is lower) and remain
high for the startup time. In most systems, this means that these signals should be pulled up with a resistor
so that signal remains high if the driving signal is Hi-Z during power up. Any logic that drives E and W should
hold the signals high with a power-on reset signal for longer than the startup time.
During power loss or brownout where V DD goes below V WI , writes are protected and a startup time must be
observed when power returns above V DD (min).
Figure 3 – Power Up and Power Down Sequencing Timing Diagram
V WI
V DD
BROWNOUT or POWER LOSS
2 ms
STARTUP
2 ms
RECOVER
READ/WRITE
INHIBITED
NORMAL
OPERATION
READ/WRITE
INHIBITED
NORMAL
OPERATION
V IH
V IH
E
W
Copyright ? 2013 Everspin Technologies
8
MR256A08B Rev. 6, 10/2013
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