M48T128 ST Microelectronics, M48T128 Datasheet - Page 6

• Manufacturer Part Number: M48T128
• Description: 3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM
• Manufacturer: ST Microelectronics

M48T128Y, M48T128V
Figure 5. Power Down/Up Mode AC Waveforms
Table 7. Power Down/Up Trip Points DC Characteristics
(T
Note: 1. All voltages referenced to V
Table 8. Power Down/Up AC Characteristics
(T
Note: 1. V
6/14
A
A
Symbol
Symbol
t
t
V
= 0 to 70 °C)
DR
= 0 to 70 °C)
t
V
FB
t
F
t
REC
2. At 25°C.
2. V
PFD
t
RB
SO
R
(1)
(2)
(2)
V
PFD
PFD
PFD
V CC
V PFD (max)
V PFD (min)
V SS
INPUTS
OUTPUTS
(max) to V
(min) to V
(min).
Power-fail Deselect Voltage
Battery Back-up Switchover Voltage
Expected Data Retention Time
V
V
V
V
V
PFD
PFD
PFD
SS
PFD
to V
(min) to V
(max) to V
(min) to V
(max) to Inputs Recognized
SS
PFD
PFD
fall time of less than t
(min) fall time of less than t
(min) V
VALID
RECOGNIZED
PFD
SS
PFD
SS
tF
V
.
Parameter
(max) V
CC
CC
(min) V
Fall Time
Rise Time
Parameter
FB
CC
CC
may cause corruption of RAM data.
Rise Time
Fall Time
tFB
F
may result in deselection/write protection not occurring until 50µs after V
M48T128Y
M48T128V
M48T128Y
M48T128V
(1)
DON'T CARE
HIGH-Z
Min
4.1
2.7
10
tRB
V
PFD
Min
300
10
40
4.35
Typ
0
1
2.9
3.0
–100mV
tR
Max
200
RECOGNIZED
Max
VALID
4.5
3.0
AI03612
YEARS
Unit
CC
Unit
ms
µs
µs
µs
µs
V
V
V
V
passes