Datasheet

Operating modes M48Z35, M48Z35Y
12/24 Doc ID 2608 Rev 10
Figure 8. Power down/up mode AC waveforms
Table 5. Power down/up AC characteristics
Table 6. Power down/up trip points DC characteristics
Note: All voltages referenced to V
SS
.
Symbol Parameter
(1)
1. Valid for ambient operating temperature: T
A
= 0 to 70 °C; V
CC
= 4.75 to 5.5 V or 4.5 to 5.5 V (except where noted).
Min Max Unit
t
PD
E or W at V
IH
before power down 0 µs
t
F
(2)
2. V
PFD
(max) to V
PFD
(min) fall time of less than t
F
may result in deselection/write protection not occurring until 200 µs after
V
CC
passes V
PFD
(min).
V
PFD
(max) to V
PFD
(min) V
CC
fall time 300 µs
t
FB
(3)
3. V
PFD
(min) to V
SS
fall time of less than t
FB
may cause corruption of RAM data.
V
PFD
(min) to V
SS
V
CC
fall time 10 µs
t
R
V
PFD
(min) to V
PFD
(max) V
CC
rise time 10 µs
t
RB
V
SS
to V
PFD
(min) V
CC
rise time 1 µs
t
rec
V
PFD
(max) to inputs recognized 40 200 ms
Symbol Parameter
(1)
1. Valid for ambient operating temperature: T
A
= 0 to 70 °C; V
CC
= 4.75 to 5.5V or 4.5 to 5.5V (except where noted).
Min Typ Max Unit
V
PFD
Power-fail deselect voltage
M48Z35 4.5 4.6 4.75 V
M48Z35Y 4.2 4.35 4.5 V
V
SO
Battery backup switchover voltage M48Z35/Y 3.0 V
t
DR
(2)
2. At 25 °C, V
CC
= 0 V.
Expected data retention time 10 Years
AI01168C
V
CC
INPUTS
(PER CONTROL INPUT)
OUTPUTS
DON'T CARE
HIGH-Z
tF
tFB
tR
tPD
tRB
tDR
VALID VALID
(PER CONTROL INPUT)
RECOGNIZEDRECOGNIZED
V
PFD
(max)
V
PFD
(min)
V
SO
trec