M48T128V-70PM1 STMICROELECTRONICS [STMicroelectronics], M48T128V-70PM1 Datasheet - Page 10

• Manufacturer Part Number: M48T128V-70PM1
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

Operation modes
2.3
Note:
10/23
Table 4.
1. Valid for ambient operating temperature: T
2. C
3. If E goes low simultaneously with W going low, the outputs remain in the high impedance state.
Data retention mode
With valid V
RAM. Should the supply voltage decay, the RAM will automatically power-fail deselect, write
protecting itself when V
become high impedance, and all inputs are treated as “Don't care.”
A power failure during a WRITE cycle may corrupt data at the currently addressed location,
but does not jeopardize the rest of the RAM's content. At voltages below V
user can be assured the memory will be in a write protected state, provided the V
is not less than t
reach into the deselect window during the time the device is sampling V
decoupling of the power supply lines is recommended.
When V
preserving data and powering the clock. The internal energy source will maintain data in the
M48T128Y/V for an accumulated period of at least 10 years at room temperature. As
system power rises above V
switched to external V
t
t
WHQX
WLQZ
Symbol
noted).
t
t
t
t
t
t
t
t
t
t
t
t
t
WLWH
WHAX
DVWH
WHDX
AVWH
EHDX
AVWL
EHAX
DVEH
AVEH
AVEL
ELEH
AVAV
L
= 5 pF.
(2)(3)
(2)(3)
CC
drops below V
CC
WRITE mode AC characteristics
WRITE cycle time
Address valid to WRITE enable low
Address valid to chip enable low
WRITE enable pulse width
Chip enable low to chip enable 1 high
WRITE enable high to address transition
Chip enable high to address transition
Input valid to WRITE enable high
Input valid to chip enable high
WRITE enable high to input transition
Chip enable high to input transition
WRITE enable low to output Hi-Z
Address valid to WRITE enable high
Address valid to chip enable high
WRITE enable high to output transition
applied, the M48T128Y/V operates as a conventional BYTEWIDE™ static
F
. The M48T128Y/V may respond to transient noise spikes on V
CC
CC
. Deselect continues for t
SO
Parameter
falls within the V
, the control circuit switches power to the internal battery,
SO
, the battery is disconnected, and the power supply is
Doc ID 5746 Rev 6
(1)
A
= 0 to 70 °C; V
PFD
(max), V
REC
CC
= 4.5 to 5.5 V or 3.0 to 3.6 V (except where
Min
after V
70
50
55
10
30
30
10
60
60
M48T128Y
0
0
5
5
5
PFD
–70
(min) window. All outputs
CC
Max
25
reaches V
M48T128Y, M48T128V
Min
85
60
65
15
35
35
15
70
70
M48T128V
0
0
5
5
5
CC
PFD
. Therefore,
–85
PFD
Max
(max).
(min), the
30
CC
CC
that
fall time
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns