WED2DL32512V
SNOOZE MODE
SNOOZE MODE is a low-current, “power-down” mode In which the
device is deselected and current is reduced to I
SB2Z
. The duration of
SNOOZE MODE is dictated by the length of time ZZ is in a HIGH state.
After the device enters SNOOZE MODE, all inputs except ZZ become
gated inputs and are ignored. ZZ is an asynchronous, active HIGH
input that causes the device to enter SNOOZE MODE. When ZZ
becomes a logic HIGH, I
SB2Z
is guaranteed after the setup time t
ZZ
is
met. Any READ or WRITE operation pending when the device enters
SNOOZE MODE is not guaranteed to complete successfully. There-
fore, SNOOZE MODE must not be initiated until valid pending
operations are completed.
SNOOZE MODE
Description
Current during SNOOZE MODE
ZZ active to input ignored
ZZ inactive to input sampled
ZZ active to snooze current
ZZ inactive to exit snooze current
Conditions
ZZ
≥
VIH
Symbol
I
SB2Z
t
ZZ
t
RZZ
t
ZZI
t
RZZI
Min
Max
10
2(t
KC
)
2(t
KC
)
Units
mA
ns
ns
ns
ns
Notes
1
1
1
1
2(t
KC
)
FIG. 2
SNOOZE MODE TIMING DIAGRAM
CLOCK
t
ZZ
ZZ
t
RZZ
t
ZZI
I
SUPPLY
t
RZZI
I
ISB2Z
ALL INPUTS
(except ZZ)
DESELECT or READ Only
Output (Q)
HIGH-Z
DON'T CARE
White Electronic Designs Corporation • (508) 366-5151 • www.whiteedc.com
6
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