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M48T37Y Fiches technique(PDF) 19 Page - STMicroelectronics

No de pièce M48T37Y
Description  5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER짰 SRAM
PDF  30 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M48T37Y Fiches technique(HTML) 19 Page - STMicroelectronics

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M48T37Y, M48T37V
Clock operations
Doc ID 7019 Rev 9
19/30
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
Schottky diode from VCC to VSS (cathode connected to VCC, anode to VSS). Schottky diode
1N5817 is recommended for through hole and MBRS120T3 is recommended for surface
mount.
Figure 9.
Supply voltage protection
Figure 10.
Crystal accuracy across temperature
Figure 11.
Clock calibration
AI02169
VCC
0.1
µF
DEVICE
VCC
VSS
AI00999
–160
0
10203040506070
Frequency (ppm)
Temperature
°C
80
–10
–20
–30
–40
–100
–120
–140
–40
–60
–80
20
0
–20
ΔF
= -0.038
(T - T
0)
2 ± 10%
F
ppm
C
2
T
0 = 25 °C
AI00594B
NORMAL
POSITIVE
CALIBRATION
NEGATIVE
CALIBRATION



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