m48t512y STMicroelectronics, m48t512y Datasheet - Page 17

• Manufacturer Part Number: m48t512y
• Description: 5.0 Or 3.3v, 4 Mbit 512 Kbit X 8 Timekeeper Sram
• Manufacturer: STMicroelectronics

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
Symbol
Symbol
t
V
t
V
DR
t
t
FB
REC
t
F
2. V
3. V
2. Valid for Ambient Operating Temperature: T
3. At 25°C, V
PFD
t
RB
SO
R
(2)
(3)
(3)
es V
PFD
PFD
V CC
V PFD (max)
V PFD (min)
V SO
V SS
INPUTS
(Including E)
OUTPUTS
PFD
(max) to V
(min) to V
Power-fail Deselect Voltage
Battery Back-up Switchover Voltage
Expected Data Retention Time
V
V
V
V
E Recovery Time
(min).
PFD
PFD
PFD
SS
CC
to V
= 0V.
(max) to V
(min) to V
(min) to V
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
Fall Time
Rise Time
Parameter
FB
CC
CC
(1,2)
may cause corruption of RAM data.
Rise Time
Fall Time
A
A
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)
M48T512Y
M48T512V
M48T512Y
M48T512V
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
M48T512Y
M48T512V
DON'T CARE
HIGH-Z
Min
4.2
2.7
10
tRB
V
PFD
Min
300
150
10
10
40
1
4.35
Typ
2.9
3.0
–100mV
M48T512Y, M48T512V*
tR
Max
200
tREC
RECOGNIZED
VALID
Max
4.5
3.0
AI02385
YEARS
Unit
ms
µs
µs
µs
µs
µs
Unit
CC
V
V
V
V
17/21
pass-