M48T129V-85PM1 STMicroelectronics, M48T129V-85PM1 Datasheet - Page 19

• Manufacturer Part Number: M48T129V-85PM1
• Description: IC TIMEKPR NVRAM 1MBIT 3V 32-DIP
• Manufacturer: STMicroelectronics
• Series: Timekeeper®r
• Type: Clock/Calendar/NVSRAMr

Specifications of M48T129V-85PM1

• Memory Size: 1M (128K x 8)
• Time Format: HH:MM:SS (24 hr)
• Date Format: YY-MM-DD-dd
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 32-DIP (600 mil) Module
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-2835-5

M48T129V, M48T129Y
3.11
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 0.1 µF (see
Figure
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, ST recommends connecting a schottky
diode from V
is recommended for through hole and MBRS120T3 is recommended for surface-mount).
Figure 12. Supply voltage protection
CC
CC
transients, including those produced by output switching, can produce voltage
noise and negative going transients
12) is recommended in order to provide the needed filtering.
CC
to V
SS
(cathode connected to V
V CC
Doc ID 5710 Rev 4
0.1µF
CC
CC
that drive it to values below V
bus. These transients can be reduced if
CC
, anode to V
V CC
V SS
DEVICE
CC
bus. The energy stored in the
SS
). (Schottky diode 1N5817
SS
Clock operations
by as much as
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