m48t129v STMicroelectronics, m48t129v Datasheet - Page 23

• Manufacturer Part Number: m48t129v
• Description: 5.0 Or 3.3v, 1 Mbit 128 Kbit X 8 Timekeeper Sram
• Manufacturer: STMicroelectronics

Figure 16. Power Down/Up Mode AC Waveforms
Table 11. Power Down/Up AC Characteristics
Note: 1. Valid for Ambient Operating Temperature: T
Table 12. Power Down/Up Trip Points DC Characteristics
Note: 1. All voltages referenced to V
Symbol
Symbol
t
V
t
V
DR
t
t
FB
t
REC
2. V
3. V
2. Valid for Ambient Operating Temperature: T
3. At 25°C; V
F
PFD
t
RB
SO
(2)
R
(3)
(3)
es V
PFD
PFD
V CC
V PFD (max)
V PFD (min)
V SO
INPUTS
OUTPUTS
RST
PFD
(max) to V
(min) to V
Power-fail Deselect Voltage
Battery Back-up Switchover Voltage
Expected Data Retention Time
V
V
V
V
V
(min).
PFD
PFD
PFD
SS
PFD
CC
to V
= 0V.
(max) to V
(min) to V
(min) to V
(max) to RST High
SS
PFD
PFD
fall time of less than t
(min) fall time of less than t
(min) V
VALID
RECOGNIZED
SS
PFD
PFD
SS
Parameter
tF
V
.
(max) V
CC
CC
(min) V
Rise Time
Fall Time
Parameter
FB
CC
CC
(1,2)
may cause corruption of RAM data.
A
A
Rise Time
Fall Time
tFB
= 0 to 70°C; V
= 0 to 70°C; V
F
may result in deselection/write protection not occurring until 200µs after V
(1)
M48T129Y
M48T129V
M48T129Y
M48T129V
CC
CC
= 4.5 to 5.5V or 3.0 to 3.6V (except where noted).
= 4.5 to 5.5V or 3.0 to 3.6V (except where noted).
M48T129Y
M48T129V
DON'T CARE
HIGH-Z
Min
4.2
2.7
10
tRB
V
PFD
Min
300
150
10
40
0
1
4.35
Typ
2.9
3.0
–100mV
M48T129Y, M48T129V
tR
Max
200
tREC
RECOGNIZED
VALID
Max
4.5
3.0
AI01805
YEARS
Unit
ms
µs
µs
µs
µs
µs
Unit
CC
V
V
V
23/30
pass-