Microchip Matching data
◆Specification for Quartz Crystal

Nominal Frequency

SSP-T7-F

SC-32S

SC-20S

SC-12S32.768kHz

32.768kHz

32.768kHz

32.768kHz-6-6-6+/-20x10-6

Frequency Tolerance+/-20x10+/-20x10+/-20x10

Load capacitance：CL

7pF / 12.5pF

7pF / 12.5pF

7pF / 12.5pF

7pF

Motional Resistance：R165KΩmax

70kΩmax

70kΩmax

90kΩmax

Absolute Maximum Drive Level

1.0μW max

1.0μW max

1.0μW max

0.3μW max

7.0×1.5×1.4mm

3.2×1.5×0.85mm

2.0×1.2×0.6mm

1.2×1.0×0.5mmDimensions(Thickness: Max.Value)

SSP-T7-F

SC-32S

SC-20S

SC-12S

0.3

0.6 0.6

RECOMMENDED SOLDERING PATTERN

5.1

1.2

1.2

SSP-T7-F

1.0

1.5

0.7 0.8

1.0SC-32S

1.0

1.4

1.8

Unit: mm

SC-20S

Unit: mm

0.4 0.3 0.4

0.7
Unit: mm

SC-12S(2 terminalsUnit:) mm◆Approximate expression for Circuit load capacitanceCos

CL = Cg×Cd / (Cg + Cd) + Cs (pF)

XTAL 1XTAL 2

Cos : XTAL 1-XTAL 2 Stray capacitanceCgs : XTAL 1-Vss Stray capacitanceCds : XTAL 2T-Vss Stray capacitance

Cds

Cgs
Vss

◆Qualification item for Oscillation circuit characteristicsCg
XTAL1
CdXTAL2

NoItems

Symbol1

Negative Resistance

RL

2

Oscillation allowance

M

Recommendation
more than 5 times of R1Max.

Vss◆Notes for the design of Circuit board
Please keep the wiring short and place Quartz Crystal, Condensor, and Resistanceclose as possible to Microchip microcontroller. In order to prevent interference with other signal lines,
do not provide other signal lines, please do not provide other signal lines on the crystal
mounting part (bottom surface).
Seiko Instruments Inc.
1-8,Nakase,Mihama-ku,Chiba-shi,Chiba 261-8507,Japan

Phone:+81-43-211-1207(Direct)

Microchip Matching data
◆Circuit matching constant for Oscillation circuitPowerSystem

R1Max.
(kΩ)

Cg(pF)

Cd(pF)

799-654

10.1

799-65410.1

799-661

9.4

5V5

799-724

11.1

1V8

7

99-661

9.4

799-661

9.4

799-661

9.4

3V3

7

99-654

10.1

1V8799-651

9.3

799-671

9.6

2V73V3

2V73V32V73V3SSP-T7-FSC-32S

SC-20S

657070RL(kΩ)

M(Times)799-6719.6

5V571010-721

10.3

1V8

799-603

6.72V7799-573

6.4

799-573

6.4

799-6837.6

766-2,554

39.3

74

4-2,55439.3

744-2,554

39.3

74

4-2,36133.7

722-2,261

32.3

5V5

7

22-2,561

36.6

2V7

7

3

3-2,17131.0

711-2,171

31.0

5V5

7

1

1-2,071

29.6

2V7722-2,203

24.5

733-2,303

25.6

755-2,103

23.4

3V3

SC-12S

90

5V5
2V7
3V3

SSP-T7-F

65

5V52V73V3

ATtiny85

Characteristics of Oscillation

CL(pF)

Products

1V8

ATtiny817

Constants

32.768kHz quartz crystals

3V3

3V3
5V5

SC-32S

SC-20S

SC-12S

707090◆Notes
The above evaluation results are reference values evaluated in the specific sample,
and the contents are not guaranteed.
Please note that in the actual circuit board, the value of the external element capacitanceand the characteristics may change depending on the difference in stray capacitance and so on.
The microcontrollers from Microchip Technology Inc. that are tested each represents a set of microcontrollers
with the same crystal driver circuits. Please refer to application notehttps://www.microchip.com/DS00002648 for an updated list of which crystal driver type each microcontroller uses.

Seiko Instruments Inc.
1-8,Nakase,Mihama-ku,Chiba-shi,Chiba 261-8507,Japan

Phone:+81-43-211-1207(Direct)