WED2ZLRSP01S
White Electronic Designs
SNOOZE MODE
SNOOZE MODE is a low-current, “power-down” mode
in which the device is deselected and current is reduced
to ISB2Z. The duration of SNOOZE MODE is dictated by
the length of time Z 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, ISB2Z is guaranteed after
the setup time tZZ is met. Any READ or WRITE operation
pending when the device enters SNOOZE MODE is not
guaranteed to complete successfully. Therefore, SNOOZE
MODE must not be initiated until valid pending operations
are completed.
SNOOZE MODE
Description
Conditions
ZZ ≥ VIH
Symbol
ISB2Z
tZZ
tRZZ
tZZI
Min
Max
10
Units Notes
mA
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
2(tKC
)
ns
ns
ns
ns
1
1
1
1
2(tKC
)
2(tKC
)
tRZZI
FIG. 2 SNOOZE MODE TIMING DIAGRAM
CLOCK
t
ZZ
t
RZZ
ZZ
t
ZZI
t
RZZI
ISUPPLY
I
ISB2Z
ALL INPUTS
(except ZZ)
DESELECT or READ Only
Output (Q)
HIGH-Z
DON'T CARE
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
April, 2002
Rev. 0
7
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
WEDC [ WHITE ELECTRONIC DESIGNS CORPORATION ]
