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M41T62 Datasheet(PDF) 33 Page - STMicroelectronics

Part # M41T62
Description  Serial Access Real-Time Clock with Alarms
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41T62 Datasheet(HTML) 33 Page - STMicroelectronics

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M41T62/63/64/65
DC and AC parameters
33/40
Table 16.
Oscillator characteristics
Figure 25.
Bus timing requirements sequence
Table 15.
Crystal electrical characteristics
Sym
Parameter(1)(2)
1.
Externally supplied if using the QFN16 package. STMicroelectronics recommends the Citizen CFS-145
(1.5x5mm) and the KDS DT-38 (3x8mm) for thru-hole, or the KDS DMX-26S (3.2x8mm) for surface-mount,
tuning fork-type quartz crystals.
KDS can be contacted at kouhou@kdsj.co.jp or http://www.kdsj.co.jp.
Citizen can be contacted at csd@citizen-america.com or http://www.citizencrystal.com.
2.
Load capacitors are integrated within the M41T6x. Circuit board layout considerations for the 32.768kHz
crystal of minimum trace lengths and isolation from RF generating signals should be taken into account.
Min
Typ
Max
Units
fO
Resonant frequency
32.768
kHz
RS
Series resistance (T
A = –40 to 70°C, oscillator start-up at 2.0V)
75(3)(4)
3.
Guaranteed by design.
4.
RS (max) = 65kΩ for TA = –40 to 85°C and oscillator start-up at 1.5V.
k
CL
Load capacitance
6
pF
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VSTA
Oscillator start voltage
≤10 seconds
1.5
V
tSTA
Oscillator start time
VCC = 3.0V
1
s
Cg
XIN
12
pF
Cd
XOUT
12
pF
IC-to-IC frequency variation (1)
1.
Reference value. TA = 25°C, VCC = 3.0V, CMJ-145 (CL = 6pF, 32,768Hz) manufactured by citizen.
–10
+10
ppm
AI00589
SDA
P
tSU:STO
tSU:STA
tHD:STA
SR
SCL
tSU:DAT
tF
tHD:DAT
tR
tHIGH
tLOW
tHD:STA
tBUF
S
P


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