m48t12 STMicroelectronics, m48t12 Datasheet - Page 15

• Manufacturer Part Number: m48t12
• Description: 5.0v, 16 Kbit 2kb X 8 Timekeeper Sram
• Manufacturer: STMicroelectronics

Figure 8.
Figure 9.
3.5
NORMAL
POSITIVE
CALIBRATION
NEGATIVE
CALIBRATION
Crystal accuracy across temperature
Clock calibration
V
I
fluctuations, resulting in spikes on the V
capacitors are used to store energy which stabilizes the V
bypass capacitors will be released as low going spikes are generated or energy will be
absorbed when overshoots occur. A ceramic bypass capacitor value of 0.1µF (as shown in
Figure 10 on page
In addition to transients that are caused by normal SRAM operation, power cycling can
generate negative voltage spikes on V
one volt. These negative spikes can cause data corruption in the SRAM while in battery
backup mode. To protect from these voltage spikes, it is recommended to connect a
CC
CC
transients, including those produced by output switching, can produce voltage
-100
-20
-40
-60
-80
ppm
20
noise and negative going transients
0
0
5
16) is recommended in order to provide the needed filtering.
ΔF = -0.038
10
F
15
T
20
0
ppm
= 25 °C
C
2
25
(T - T
30
0
)
CC
2
CC
± 10%
35
that drive it to values below V
bus. These transients can be reduced if
40
45
50
CC
55
bus. The energy stored in the
60
65
AI02124
SS
70
by as much as
°C
AI00594B
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