M41T62_10 Datasheet, PDF (34/41 Pages) STMicroelectronics – Serial real-time clocks with alarm

DC and AC parameters
M41T62/63/64/65
Table 15. Crystal electrical characteristics
Sym
Parameter⁽¹⁾⁽²⁾
Min
Typ
Max Units
f_O Resonant frequency
-
R_S Series resistance (T_A = –40 to 70 °C, oscillator startup at 2.0 V)
-
32.768
kHz
75⁽³⁾⁽⁴⁾
kΩ
C_L Load capacitance
-
6
pF
1. For the QFN16 package, user-supplied external crystals are required. The 6 and 7 pF crystals listed in Table 16 below
have been evaluated by ST and have been found to be satisfactory for use with the M41T6x series RTC.
2. Load capacitors are integrated within the M41T6x. 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.
3. Guaranteed by design.
4. R_{S (max)} = 65 kΩ for T_A = –40 to 85 °C and oscillator startup at 1.5 V.
Table 16. Crystals suitable for use with M41T6x series RTCs
Manufacturer’s specifications
Vendor
Order number
Package
ESR
max
Temp.
range (°C)
Rated
tolerance
at 25 °C
Rated
load
cap.
Citizen CMJ206T-32.768KDZB-UB
8.3 x 2.5 mm
leaded SMT
50 kΩ
Citizen CM315-32.768KDZY-UB
3.2 x 1.5 x 0.9 mm SMT 70 kΩ
Ecliptek E4WCDA06-32.768K
2.0 x 6.0 mm thru-hole 50 kΩ
Ecliptek E5WSDC 07 - 32.768K
7 x 1.5 x 1.4 mm SMT 65 kΩ
ECS
ECS-.327-6-17X-TR
3.8 x 8.5 x 2.5 mm SMT 50 kΩ
ECS
ECS-.327-7-34B-TR
3.2 x 1.5 x 0.9 mm SMT 70 kΩ
ECS
Epson
ECS-.327-7-38-TR
MC-146 32.7680KA-AG: ROHS⁽¹⁾
7 x 1.5 x 1.4 mm SMT 65 kΩ
7 x 1.5 x 1.4 mm SMT 65 kΩ
Fox
298LF-0.032768-19
1.5 x 5.0 mm thru-hole 50 kΩ
Fox
299LF-0.032768-37
2.0 x 6.0 mm thru-hole 50 kΩ
Fox
414LF-0.032768-12
3.8 x 8.5 x 2.5 mm SMT 50 kΩ
Fox
501LF-0.032768-5
7 x 1.5 x 1.4 mm SMT 65 kΩ
Micro
Crystal
MS3V-T1R 32.768KHZ 7PF 20PPM
6.7 x 1.4 mm
leaded SMT
65 kΩ
Pletronics SM20S - 32.768K - 6pF
3.8 x 8.5 x 2.5 mm SMT 50 kΩ
Seiko
SSPT7F-7PF20PPM
7 x 1.5 x 1.4 mm SMT 65 kΩ
Seiko
VT200F-6PF20PPM
2.0 x 6.0 mm thru-hole 50 kΩ
–40/+85
–40/+85
–10/+60
–40/+85
–10/+60
–40/+85
–40/+85
–40/+85
–20/+60
–20/+60
–40/+85
–40/+85
–40/+85
–40/+85
–40/+85
–10/+60
±20 ppm 6 pF
±20 ppm
±20 ppm
±20 ppm
±20 ppm
±20 ppm
±20 ppm
±20 ppm
±20 ppm
±20 ppm
±20 ppm
±20 ppm
7 pF
6 pF
7 pF
6 pF
7 pF
7 pF
7 pF
6 pF
6 pF
6 pF
7 pF
±20 ppm 7 pF
±20 ppm
±20 ppm
±20 ppm
6 pF
7 pF
6 pF
1. Epson MC-146 32.7680KA-E: ROHS is 6 pF version.
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