Datasheet

M48T37Y, M48T37V DC and AC parameters
Doc ID 7019 Rev 9 23/30
Note: All voltages referenced to V
SS
.
Table 12. Power down/up AC characteristics
Symbol Parameter
(1)
1. Valid for ambient operating temperature: T
A
= 0 to 70 °C or –40 to 85 °C; V
CC
= 4.5 to 5.5 V or 3.0 to 3.6 V
(except where noted).
Min Max Unit
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
(4)
4. t
REC
(min) = 20 ms for industrial temperature range - grade 6 device.
V
PFD
(max) to RST high 40 200 ms
Table 13. Power down/up trip points DC characteristics
Symbol Parameter
(1)
1. Valid for ambient operating temperature: T
A
= 0 to 70 °C or –40 to 85 °C; V
CC
= 4.5 to 5.5 V or 3.0 to 3.6 V
(except where noted).
Min Typ Max Unit
V
PFD
Power-fail deselect voltage
M48T37Y 4.2 4.4 4.5 V
M48T37V 2.7 2.9 3.0 V
V
SO
Battery backup switchover voltage
M48T37Y V
BAT
V
M48T37V V
PFD
–100 mV V
t
DR
(2)
2. At 25 °C, V
CC
= 0 V.
Expected data retention time
Grade 1 5 7 Years
Grade 6 10
(3)
3. Using larger M4T32-BR12SH6 SNAPHAT
®
top (recommended for industrial temperature range - grade 6
device).
Years