SC9270C/D 查看數據表（PDF） - Silan Microelectronics

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SC9270C/D

DTMF RECEIVER

Silan Microelectronics 

Silan

Semiconductors

6. CRYSTAL OSCILLATOR

The internal clock circuit is completed with the addition of

an external 3.579545MHz crystal and is normally

connected as shown in Figure 2. However, it is possible

to configure several SC9270C/D devices employing only

a single oscillator crystal. The oscillator output of the first

device in the chain is coupled through a 30pF capacitor

to the oscillator input (OSCI) of the next device.

Subsequent devices are connected in a similar fashion.

Refer to Figure 9 for details. The problems associated

with unbalanced loading are not a concern with the

arrangement shown, ie: precision balancing capacitors

are not required.

SC9270C/D

OSCI

OSCO

X-tal

C

To OSCI of next

SC9270C/D

C

OSCO

OSCI

c=30pF

X-tal=3.579545MHz

Figure 9 Oscillator Connection

PACKAGE OUTLINE

DIP-18-300-2.54

2.54

UNIT: mm

1.50

22.95

15 degree

0.46

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.1 2001.04.27

12

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