mr4a16b Everspin Technologies, Inc, mr4a16b Datasheet - Page 5

• Manufacturer Part Number: mr4a16b
• Description: 1m X 16 Mram
• Manufacturer: Everspin Technologies, Inc

Everspin Technologies © 2010
Electrical Specifications
Power Up and Power Down Sequencing
MRAM is protected from write operations whenever V
there is a startup time of 2 ms before read or write operations can start. This time allows memory power
supplies to stabilize.
The E and W control signals should track V
high for the startup time. In most systems, this means that these signals should be pulled up with a resis-
tor 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
observed when power returns above V
i
ii
iii
V
Parameter
Power supply voltage
Write inhibit voltage
Input high voltage
Input low voltage
Temperature under bias
There is a 2 ms startup time once V
V
MR4A16B (Commercial)
MR4A16BC (Industrial)
MR4A16BM (Automotive)
IH
IL
(min) = -0.5 V
(max) = V
WRITES INHIBITED
DD
+ 0.3 V
DC
; V
V
W
E
WI
IL
DC
(min) = -2.0 V
; V
IH
(max) = V
Figure 2.1 Power Up and Power Down Diagram
STARTUP TIME
AC
DD
(pulse width ≤ 10 ns) for I ≤ 20.0 mA.
exceeds V
DD
+ 2.0 V
NORMAL OPERATION
Table 2.2 Operating Conditions
V
V
T
DD
Symbol
V
V
A
DD
DD
WI
IH
IL
(min).
AC
DD,
goes below V
V
DD
(pulse width ≤ 10 ns) for I ≤ 20.0 mA.
DD
(max). See Power Up and Power Down Sequencing below.
on power up to V
BROWNOUT OR POWER LOSS
Min
3.0
2.5
2.2
-0.5
0
-40
-40
5
DD
is less than V
WI
i
iii
, writes are protected and a startup time must be
STARTUP TIME
Document Number: MR4A16B Rev. 5, 4/2010
DD
- 0.2 V or V
NORMAL OPERATION
Typical
3.3
2.7
-
-
WI
. As soon as V
V
DD
IH
(whichever is lower) and remain
Max
3.6
3.0
V
0.8
70
85
125
DD
V
WI
i
DD
+ 0.3
MR4A16B
exceeds V
ii
Unit
V
V
V
V
°C
DD
(min),