Datasheet

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 V
CC
to V
SS
(cathode connected to V
CC
, anode to V
SS
). 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
V
CC
0.1µF DEVICE
V
CC
V
SS
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