m48t128y STMicroelectronics, m48t128y Datasheet - Page 14

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

M48T128Y, M48T128V*
V
I
switching, can produce voltage fluctuations, re-
sulting in spikes on the V
can be reduced if capacitors are used to store en-
ergy which stabilizes the V
stored in the bypass capacitors will be released as
low going spikes are generated or energy will be
absorbed when overshoots occur. A ceramic by-
pass capacitor value of 0.1µF (as shown in Figure
10) is recommended in order to provide the need-
ed filtering.
In addition to transients that are caused by normal
SRAM operation, power cycling can generate neg-
ative voltage spikes on V
below V
spikes can cause data corruption in the SRAM
while in battery backup mode. To protect from
these voltage spikes, it is recommended to con-
nect a schottky diode from V
connected to V
1N5817 is recommended for through hole and
MBRS120T3 is recommended for surface mount.
14/22
CC
CC
transients, including those produced by output
Noise And Negative Going Transients
SS
by as much as one volt. These negative
CC
, anode to V
CC
CC
bus. These transients
CC
that drive it to values
CC
SS
bus. The energy
). Schottky diode
to V
SS
(cathode
Figure 10. Supply Voltage Protection
V CC
0.1 F
V CC
V SS
DEVICE
AI02169