DC and AC parameters M48T08, M48T08Y, M48T18
22/31 Doc ID 2411 Rev 11
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 °C; V
CC
= 4.75 to 5.5 V or 4.5 to 5.5 V (except where
noted).
Min Max Unit
t
PD
E1 or W at V
IH
or E2 at V
IL
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 0 µs
t
RB
V
SS
to V
PFD
(min) V
CC
rise time 1 µs
t
rec
E1 or W at V
IH
or E2 at V
IL
before power-up 1 ms
t
PFX
INT low to auto deselect 10 40 µs
t
PFH
V
PFD
(max) to INT high 120 µs
Symbol Parameter
(1)(2)
1. All voltages referenced to V
SS
.
2. 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 Typ Max Unit
V
PFD
Power-fail deselect voltage
M48T08 4.5 4.6 4.75 V
M48T18/T08Y 4.2 4.3 4.5 V
V
SO
Battery backup switchover voltage 3.0 V
t
DR
Expected data retention time 10
(3)
3. At 55 °C, V
CC
= 0 V; t
DR
= 8.5 years (typ) at 70 °C. Requires use of M4T32-BR12SH SNAPHAT
®
top when
using the SOH28 package.
Ye a r s
