m48z18 STMicroelectronics, m48z18 Datasheet - Page 12

• Manufacturer Part Number: m48z18
• Description: 5v, 64 Kbit 8kb X 8 Zeropower Sram
• Manufacturer: STMicroelectronics

M48Z08, M48Z18
Figure 10. Power Down/Up Mode AC Waveforms
Note: Inputs may or may not be recognized at this time. Caution should be taken to keep E high as V
Table 9. Power Down/Up AC Characteristics
Note: 1. Valid for Ambient Operating Temperature: T
Table 10. Power Down/Up Trip Points DC Characteristics
Note: 1. All voltages referenced to V
12/16
Symbol
Symbol
t
V
V
DR
may perform inadvertent WRITE cycles after V
power on reset is being applied to the processor, a reset condition may not occur until after the system is running.
t
2. V
3. V
2. Valid for Ambient Operating Temperature: T
3. At 25°C, V
PFD
t
FB
SO
t
t
t
F
PD
t
RB
rec
(3)
(2)
R
es V
(3)
PFD
PFD
V CC
V PFD (max)
V PFD (min)
V SO
INPUTS
OUTPUTS
PFD
(max) to V
(min) to V
Power-fail Deselect Voltage
Battery Back-up Switchover Voltage
Expected Data Retention Time
(min).
E or W at V
V
V
V
V
E or W at V
CC
PFD
PFD
PFD
SS
= 0V.
to V
SS
PFD
(min) to V
(max) to V
(min) to V
tPD
fall time of less than t
(PER CONTROL INPUT)
(min) fall time of less than tF may result in deselection/write protection not occurring until 200µs after V
PFD
IH
IH
VALID
(min) V
RECOGNIZED
before Power Down
before Power Up
SS
PFD
SS
PFD
tF
.
Parameter
V
(max) V
Parameter
CC
CC
(min) V
Fall Time
Rise Time
FB
CC
CC
may cause corruption of RAM data.
CC
(1,2)
tFB
A
A
= 0 to 70°C; V
= 0 to 70°C; V
(1)
Rise Time
Fall Time
rises above V
M48Z08
M48Z18
CC
CC
PFD
= 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
(min) but before normal system operations begin. Even though a
DON'T CARE
HIGH-Z
Min
4.5
4.2
11
Min
300
10
0
0
1
2
tRB
CC
Typ
rises past V
4.6
4.3
3.0
NOTE
Max
tR
(PER CONTROL INPUT)
PFD
Max
4.75
tREC
RECOGNIZED
4.5
(min). Some systems
VALID
AI00606
Unit
ms
µs
µs
µs
µs
µs
YEARS
Unit
CC
V
V
V
pass-