DC and AC parameters

M41T60

20/27

Doc ID 10396 Rev 13

Table 8.

Crystal electrical characteristics

Symbol

Min

Typ

Max

Unit

Resonant frequency

-

32.768

kHz

Series resistance

k

Ω

Load capacitance

-

6

pF

1.

For the QFN16 package, user-supplied, external crystals are required. The 6 and 7 pF crystals listed in Table 9 below have

been evaluated by ST and have been found to be satisfactory for use with the M41T6x series RTCs.

2.

Load capacitors are integrated within the M41T60. 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.

Table 9.

Crystals suitable for use with M41T6x series RTCs

Vendor

Order number

Package

Manufacturer’s specifications

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 k

Ω

–40/+85

±20 ppm

6 pF

Citizen

CM315-32.768KDZY-UB

3.2 x 1.5 x 0.9 mm SMT

70 k

Ω

–40/+85

±20 ppm

7 pF

Ecliptek

E4WCDA06-32.768K

2.0 x 6.0 mm thru-hole

50 k

Ω

–10/+60

±20 ppm

6 pF

Ecliptek

E5WSDC 07 - 32.768K

7 x 1.5 x 1.4 mm SMT

65 k

Ω

–40/+85

±20 ppm

7 pF

ECS

ECS-.327-6-17X-TR

3.8 x 8.5 x 2.5 mm SMT

50 k

Ω

–10/+60

±20 ppm

6 pF

ECS

ECS-.327-7-34B-TR

3.2 x 1.5 x 0.9 mm SMT

70 k

Ω

–40/+85

±20 ppm

7 pF

ECS

ECS-.327-7-38-TR

7 x 1.5 x 1.4 mm SMT

65 k

Ω

–40/+85

±20 ppm

7 pF

Epson

7 x 1.5 x 1.4 mm SMT

65 k

Ω

–40/+85

±20 ppm

7 pF

Fox

298LF-0.032768-19

1.5 x 5.0 mm thru-hole

50 k

Ω

–20/+60

±20 ppm

6 pF

Fox

299LF-0.032768-37

2.0 x 6.0 mm thru-hole

50 k

Ω

–20/+60

±20 ppm

6 pF

Fox

414LF-0.032768-12

3.8 x 8.5 x 2.5 mm SMT

50 k

Ω

–40/+85

±20 ppm

6 pF

Fox

501LF-0.032768-5

7 x 1.5 x 1.4 mm SMT

65 k

Ω

–40/+85

±20 ppm

7 pF

Micro

Crystal

MS3V-T1R 32.768KHZ 7PF 20PPM

6.7 x 1.4 mm

leaded SMT

65 k

Ω

–40/+85

±20 ppm

7 pF

Pletronics SM20S - 32.768K - 6pF

3.8 x 8.5 x 2.5 mm SMT

50 k

Ω

–40/+85

±20 ppm

6 pF

Seiko

SSPT7F-7PF20PPM

7 x 1.5 x 1.4 mm SMT

65 k

Ω

–40/+85

±20 ppm

7 pF

Seiko

VT200F-6PF20PPM

2.0 x 6.0 mm thru-hole

50 k

Ω

–10/+60

±20 ppm

6 pF

1.

Epson MC-146 32.7680KA-E: ROHS is 6 pF version.