Datasheet

DocID012578 Rev 16 53/64
M41T82, M41T83 DC and AC parameters
Figure 27. I
CC2
vs. temperature
Table 22. Crystal electrical characteristics
Symbol Parameter
(1)(2)
1. Externally supplied if using the QFN16 or SO8 package. STMicroelectronics recommends the Citizen CFS-
145 (1.5 x 5 mm) and the KDS DT-38 (3 x 8 mm) for thru-hole, or the KDS DMX-26S (3.2 x 8 mm) or Micro
Crystal MS3V-T1R (1.5 x 5 mm) for surface-mount, tuning fork-type quartz crystals.
2. Load capacitors are integrated within the M41T8x. Circuit board layout considerations for the 32.768 kHz
crystal of minimum trace lengths and isolation from RF generating signals should be taken into account.
Min Typ Max Units
f
O
Resonant frequency 32.768 kHz
R
S
Series resistance 65
(3)
3. Guaranteed by design.
k
C
L
Load capacitance 12.5 pF
Table 23. Oscillator characteristics
Symbol Parameter
(1)(2)
1. With default analog calibration value ( = 0)
2. Reference value
Conditions Min Typ Max Units
V
STA
Oscillator start voltage  4 s 2.0 V
t
STA
Oscillator start time V
CC
= V
SO
1s
C
XI,
C
XO
(1)
Capacitor input, capacitor output 25 pF
IC-to-IC frequency variation
(2)(3)
3. T
A
= 25 °C, V
CC
= 5.0 V
–10 +10 ppm
ai 13909
2.000
3.000
4.000
5.000
6.000
7.000
8.000
9.000
10.000
-40 -20 0 20 40 60 80
Temperature (°C)
Icc2 (µA)
(3.0V)
(5.0V)