m48t128y STMicroelectronics, m48t128y Datasheet - Page 18

• Manufacturer Part Number: m48t128y
• Description: 5.0 Or 3.3v, 1 Mbit 128 Kb X 8 Timekeeper Sram
• Manufacturer: STMicroelectronics

M48T128Y, M48T128V*
Figure 12. Power Down/Up Mode AC Waveforms
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
18/22
Symbol
Symbol
t
V
V
DR
t
2. V
3. V
2. Valid for Ambient Operating Temperature: T
3. At 25°C; V
t
PFD
t
FB
REC
SO
t
F
t
RB
(3)
(2)
R
es V
(3)
PFD
PFD
V CC
V PFD (max)
V PFD (min)
V SS
INPUTS
OUTPUTS
PFD
(max) to V
(min) to V
Power-fail Deselect Voltage
Battery Back-up Switchover Voltage
Expected Data Retention Time
(min).
V
V
V
V
V
CC
PFD
PFD
PFD
SS
PFD
= 0V.
to V
SS
PFD
(min) to V
(max) to V
(min) to V
(max) to Inputs Recognized
fall time of less than t
(min) fall time of less than tF may result in deselection/write protection not occurring until 200µs after V
PFD
VALID
(min) V
RECOGNIZED
SS
PFD
SS
Parameter
PFD
tF
.
V
(max) V
Parameter
CC
CC
(min) V
Fall Time
Rise Time
FB
(1,2)
CC
CC
may cause corruption of RAM data.
A
A
tFB
= 0 to 70°C; V
= 0 to 70°C; V
(1)
Rise Time
Fall Time
M48T128Y
M48T128V
M48T128Y
M48T128V
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).
tDR
DON'T CARE
HIGH-Z
Min
4.1
2.7
10
Min
300
10
40
0
1
tRB
V
PFD
4.35
Typ
2.9
3.0
–100mV
Max
200
RECOGNIZED
tREC
VALID
Max
4.5
3.0
AI03612
Unit
ms
µs
µs
µs
µs
YEARS
CC
Unit
V
V
V
V
pass-