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M41T01M6F

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Clock operation M41T01
16/24 DocID025389 Rev 2
Figure 10. Crystal accuracy across temperature
Figure 11. Clock calibration
3.2 Output driver pin
When the FT bit is set, the FT/OUT pin provides a nominal 512 Hz frequency output used
for calibration purposes (see Section 3.1).
When the FT bit is set to zero, the FT/OUT pin becomes an output driver that reflects the
contents of the OUT bit (D7 bit of register 7, see Table 2). If the OUT bit is zero, then the
FT/OUT pin will be driven low, if the OUT bit is one, then the FT/OUT pin will be driven high.
The OUT bit can be written through the 2-wire bus port.
Note: The FT/OUT pin is open drain which requires an external pull-up resistor.
3.3 Initial power-on defaults
Upon initial application of power to the device, the FT bit will be set to a '0' and the OUT bit
will be set to a '1'. All other register bits will initially power on in a random state.
AI00999b
–160
0 10203040506070
Frequency (ppm)
Temperature °C
80–10–20–30–40
–100
–120
–140
–40
–60
–80
20
0
–20
ΔF
= K x (T –T
O
)
2
K = –0.036 ppm/°C
2
± 0.006 ppm/°C
2
T
O
= 25°C ± 5°C
F
AI00594B
NORMAL
POSITIVE
CALIBRATION
NEGATIVE
CALIBRATION
DocID025389 Rev 2 17/24
M41T01 Maximum rating
24
4 Maximum rating
Stressing the device above the rating listed in the “Absolute maximum ratings” table may
cause permanent damage to the device. These are stress ratings only and operation of the
device at these or any other conditions above those indicated in the operating sections of
this specification is not implied. .
Caution: Negative undershoots below –0.3 V are not allowed on any pin while in the battery backup
mode.
Table 3. Absolute maximum ratings
Symbol Parameter Value Units
T
A
Ambient operating temperature –40 to 85 °C
T
STG
(1)(2)
1. For SO package, standard (SnPb) lead finish: reflow at peak temperature of 225°C (the time above 220 °C
must not exceed 20 seconds)
2. For SO package, lead-free (Pb-free) lead finish: reflow at peak temperature of 260°C (the time above
255 °C must not exceed 30 seconds)
Storage temperature (V
CC
off, oscillator off) –55 to 125 °C
V
IO
Input or output voltages –0.3 to 7 V
V
CC
Supply voltage –0.3 to 7 V
I
O
Output current 20 mA
P
D
Power dissipation 0.25 W
DC and AC parameters M41T01
18/24 DocID025389 Rev 2
5 DC and AC parameters
This section summarizes the operating and measurement conditions, as well as the DC and
AC characteristics of the device. The parameters in the following DC and AC Characteristic
tables are derived from tests performed under the measurement conditions listed in the
relevant tables. Designers should check that the operating conditions in their projects match
the measurement conditions when using the quoted parameters.
Note: Output Hi-Z is defined as the point where data is no longer driven.
Figure 12. AC testing input/output waveform
1. Effective capacitance measured with power supply at 5 V; sampled only, not 100% tested.
2. At 25 °C, f = 1 MHz.
3. Outputs deselected.
Table 4. Operating and AC measurement conditions
Parameter M41T01 Unit
Supply voltage (V
CC
) 2.0 to 5.5 V
Ambient operating temperature (T
A
) –40 to 85 °C
Load capacitance (C
L
) 100 pF
Input rise and fall times 5ns
Input pulse voltages 0.2V
CC
to 0.8V
CC
V
Input and output timing ref. voltages 0.3V
CC
to 0.7V
CC
V
Table 5. Capacitance
Symbol Parameter
(1,2)
Min Max Unit
C
IN
Input capacitance (SCL) 7 pF
C
OUT
(3)
Output capacitance (SDA, FT/OUT) 10 pF
t
LP
Low-pass filter input time constant (SDA
and SCL)
250 1000 ns
AI02568
0.8V
CC
0.2V
CC
0.7V
CC
0.3V
CC
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M41T01M6F

Mfr. #:
Buy M41T01M6F
Manufacturer:
STMicroelectronics
Description:
Real Time Clock Low-Pwr serial RTC W/ battry switchover
Lifecycle:
New from this manufacturer.
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