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M41T81 Datasheet(PDF) 16 Page - STMicroelectronics

Part # M41T81
Description  Serial access Real-Time Clock with alarm
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41T81 Datasheet(HTML) 16 Page - STMicroelectronics

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Clock operation
M41T81
16/30
The IRQ/FT/OUT/SQW pin is an open drain output which requires a pull-up resistor to VCC
for proper operation. A 500-10k resistor is recommended in order to control the rise time.
The FT Bit is cleared on power-down.
Figure 10.
Crystal accuracy across temperature
Figure 11.
Clock calibration
AI07888
–160
0
10203040506070
Frequency (ppm)
Temperature
°C
80
–10
–20
–30
–40
–100
–120
–140
–40
–60
–80
20
0
–20
= –0.036 ppm/
°C
2 ± 0.006 ppm/°C2
K
∆F
= K x (T – T
O)
2
F
T
O = 25°C ± 5°C
AI00594B
NORMAL
POSITIVE
CALIBRATION
NEGATIVE
CALIBRATION


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