M48T08-150PC1TR STMICROELECTRONICS [STMicroelectronics], M48T08-150PC1TR Datasheet - Page 20

• Manufacturer Part Number: M48T08-150PC1TR
• Description: CMOS 8K x 8 TIMEKEEPER SRAM
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M48T08, M48T08Y, M48T18
Figure 14. Power Down/Up Mode AC Waveforms
Note: Inputs may or may not be recognized at this time. Caution should be taken to keep E1 high or E2 low as V
Table 10. Power Down/Up AC Characteristics
Note: 1. Valid for Ambient Operating Temperature: T
Table 11. Power Down/Up Trip Points DC Characteristics
Note: 1. All voltages referenced to V
20/27
Symbol
Symbol
V
V
t
Some systems may perform inadvertent WRITE cycles after V
Even though a power on reset is being applied to the processor, a reset condition may not occur until after the system clock is running.
t
2. V
3. V
2. Valid for Ambient Operating Temperature: T
3. At 55°C, V
t
PFD
DR
t
t
FB
SO
t
t
t
PFX
PFH
F
PD
t
RB
rec
(2)
R
es V
(3)
PFD
PFD
V CC
V PFD (max)
V PFD (min)
V SO
INT
INPUTS
OUTPUTS
PFD
(max) to V
(min) to V
Power-fail Deselect Voltage
Battery Back-up Switchover Voltage
Expected Data Retention Time
(min).
E1 or W at V
V
V
V
V
E1 or W at V
INT Low to Auto Deselect
V
CC
PFD
PFD
PFD
SS
PFD
= 0V; t
to V
SS
PFD
(min) to V
tPD
(max) to V
(min) to V
(max) to INT High
fall time of less than t
DR
(PER CONTROL INPUT)
(min) fall time of less than t
PFD
= 8.5 years (typ) at 70°C. Requires use of M4T32-BR12SH SNAPHAT
VALID
IH
(min) V
IH
RECOGNIZED
SS
or E2 at V
or E2 at V
PFD
SS
PFD
tF
.
Parameter
V
(max) V
Parameter
CC
CC
(min) V
Fall Time
Rise Time
IL
IL
FB
tPFX
before Power Up
before Power Down
CC
CC
may cause corruption of RAM data.
(1,2)
A
A
tFB
= 0 to 70°C; V
= 0 to 70°C; V
(1)
Rise Time
Fall Time
F
may result in deselection/write protection not occurring until 200µs after V
M48T08
M48T18/T08Y
CC
CC
CC
rises above V
= 4.75 to 5.5V or 4.5 to 5.5V (except where noted).
= 4.75 to 5.5V or 4.5 to 5.5V (except where noted).
tDR
DON'T CARE
HIGH-Z
PFD
10
Min
4.5
4.2
(3)
Min
300
(min) but before normal system operations begin.
10
10
0
0
1
1
tRB
Typ
®
4.6
4.3
3.0
top when using the SOH28 package.
NOTE
Max
120
40
tR
(PER CONTROL INPUT)
CC
tPFH
Max
4.75
4.5
trec
RECOGNIZED
rises past V
VALID
AI00566
Unit
YEARS
ms
µs
µs
µs
µs
µs
µs
µs
PFD
Unit
CC
V
V
V
(min).
pass-