IMIFS741 データシートの表示（PDF） - Unspecified

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IMIFS741

Low EMI Spectrum Spread Clock

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FS741

Low EMI Spectrum Spread Clock

CONNECTION DIAGRAM

Xin

Xout

Ref_Off

LF

1

8

2 FS741 7

3

6

4

5

VDD

Refout/RS0

Modout/RS1

VSS

Figure 2. FS741, SOIC Package Pin Assignment

Pin Descriptions

Pin No. Pin Name I/O

TYPE

Description

1, 2

Xin, Xout

I/O CMOS/TTL Pins form an on-chip reference oscillator when connected to

terminals of an external parallel resonant crystal. Xin may be

connected to TTL/CMOS external clock source. If Xin is

connected to an external clock other than a crystal, leave Xout

(pin 2) unconnected.

3

Ref_Off

I CMOS/TTL Input control pin determines the on/off state of Refout. Ref_Off

has an internal pull down resistor and defaults to Refout = Off.

To enable Refout, set Ref_Off to logic high.

4

LF

O

Analog Single ended tri-state output of the phase detector. A two pole

passive loop filter is connected to LF. See tables on page 7 and

8 for proper values.

5

VSS

-

Ground Circuit Ground.

6

Modout/RS1 I/O CMOS/TTL Bi-Directional pin used for range selection input and Modout

driver output. During power up, RS1 serves as an input control

line for selecting the proper frequency operating range. After

RS1 is latched into an internal register, this pin becomes an

output for the Modout driver. Refer to page 6 for explanation on

Bi-Directional buffers. Modout/RS1 has an internal 250 K Ω pull-

up resistor to VDD.

7

Refout/RS0 I/O CMOS/TTL Bi-Directional pin used for range selection input and Refout driver

output. During power up, RS0 serves as an input control line for

selecting the proper frequency operating range. After power has

reached VDD/3, RS0 is latched into a register and this pin

becomes an output pin for the Refout driver. Refout is tri-stated

when Ref_Off is at a logic low. Refout/RS0 has an internal 250K

ohm pull-up resistor to VDD.

8

VDD

-

Power Positive Circuit Power Supply.

Table 1

International Microcircuits, Inc.

525 Los Coches St., Milpitas, 95035 408-263-6300, FAX 408-263-6571

http:/www.imicorp.com

4/5/1999

Rev. 2.1

Page 3 of 16

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