m48t18 STMicroelectronics, m48t18 Datasheet - Page 22

• Manufacturer Part Number: m48t18
• Description: 5v, 64kbit 8 Kb X 8 Timekeeper Sram
• Manufacturer: STMicroelectronics

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Table 10.
1. Valid for Ambient Operating Temperature: T
2. V
3. V
Table 11.
1. All voltages referenced to V
2. Valid for Ambient Operating Temperature: T
3. At 55°C, V
Symbol
Symbol
V
noted).
until 200µs after V
where noted).
using the SOH28 package.
V
t
t
t
t
t
FB
PFD
PFD
PFD
DR
t
t
t
PFH
SO
F
PFX
PD
t
RB
rec
(2)
R
(3)
(min) to V
(max) to V
Power-fail Deselect Voltage
Battery Back-up Switchover Voltage
Expected Data Retention Time
CC
Power down/up AC characteristics
Power down/up trip points DC characteristics
E1 or W at V
Down
V
V
V
V
E1 or W at V
INT Low to Auto Deselect
V
= 0V; t
PFD
PFD
PFD
SS
PFD
SS
PFD
to V
CC
(min) to V
fall time of less than t
(max) to V
(min) to V
(max) to INT High
DR
(min) fall time of less than t
passes V
PFD
= 8.5 years (typ) at 70°C. Requires use of M4T32-BR12SH SNAPHAT
IH
(min) V
IH
Parameter
SS
or E2 at V
or E2 at V
PFD
SS
Parameter
.
PFD
PFD
V
(max) V
CC
CC
(min).
(min) V
Fall Time
Rise Time
FB
(1)(2)
IL
IL
(1)
may cause corruption of RAM data.
before Power Up
before Power
CC
CC
A
A
= 0 to 70°C; V
M48T08
M48T18/T08Y
= 0 to 70°C; V
Rise Time
Fall Time
F
may result in deselection/write protection not occurring
CC
CC
= 4.75 to 5.5V or 4.5 to 5.5V (except where
= 4.75 to 5.5V or 4.5 to 5.5V (except
10
Min
4.5
4.2
(3)
Min
300
10
10
0
0
1
1
Typ
4.6
4.3
3.0
Max
120
40
Max
4.75
4.5
®
top when
YEARS
Unit
Unit
ms
µs
µs
µs
µs
µs
µs
µs
V
V
V