Datasheet

DC and AC parameters M48T35, M48T35Y
20/28 Doc ID 2611 Rev 10
Table 10. Power down/up AC characteristics
Table 11. Power down/up trip points DC characteristics
Symbol Parameter
(1)
1. Valid for ambient operating temperature: T
A
= 0 to 70 or –40 to 85 °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
M48T35 10 µs
M48T35Y 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
(4)
4. t
rec
(min) = 20 ms for industrial temperature grade 6 device.
V
PFD
(max) to inputs recognized 40 200 ms
Symbol Parameter
(1)(2)
1. Valid for ambient operating temperature: T
A
= 0 to 70 or –40 to 85 °C; V
CC
= 4.75 to 5.5 V or 4.5 to 5.5 V (except where
noted).
2. All voltages referenced to V
SS
.
Min Typ Max Unit
V
PFD
Power-fail deselect voltage
M48T35 4.5 4.6 4.75 V
M48T35Y 4.2 4.35 4.5 V
V
SO
Battery backup switchover voltage
M48T35 3.0 V
M48T35Y 3.0 V
t
DR
(3)(5)
3. CAPHAT™ and M4T32-BR12SH1 SNAPHAT
®
only, M4T28-BR12SH1 SNAPHAT
®
top t
DR
= 7 years (typ).
Expected data retention time
Grade 1 10
(4)
4. Using larger M4T32-BR12SH6 SNAPHAT
®
top (recommended for industrial temperature range - grade 6 device).
Ye a r s
Grade 6 10
(5)
5. At 25 °C, V
CC
= 0 V.
Ye a r s