ICS307G-03LFT 데이터 시트보기 (PDF) - Integrated Circuit Systems

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ICS307G-03LFT

SERIALLY PROGRAMMABLE CLOCK SOURCE

Integrated Circuit Systems 

ICS307-03

SERIALLY PROGRAMMABLE CLOCK SOURCE

Initial Output Frequency

ICS307-03 on-chip registers are initially configured to provide a 1x output clock on the CLK1 output, and 0.5x clock

on CLK2 and CLK3. The output frequency will be the same as the input clock or crystal for input frequencies from

10 - 50 MHz. This is useful when the ICS307-03 needs to provide an initial system clock at power-up.

Determining and Controlling the Output Frequency with VersaClockTM II

The ICS307-03 is directly supported by the ICS provided software called VersaClock II. Complete programming

words for this device can be calculated on any Windows PC by running the VersaClock II software and simple

inputting desired input and output frequencies. Once the software generates an appropriate programming word, it

may then be either copied to the Windows clipboard or even directly programmed into the ICS307-03 via the host

computers parallel port.

For more information on VersaClock II, please visit www.icst.com or send an e-mail to ics-mk@icst.com.

Manually Determining the Output Frequency

The user has full control over the desired output frequency as long as it is operated within the limits shown in the

AC Electrical Characteristics.

The output of the ICS307-03 can be determined by the following equation:

CLK1Frequency

=

InputFre

quen

cy

⋅

--------V---------

R ⋅ OD

Where:

VCO Divider (V) = 12 to 2055

Reference Divider Word (R) = 1 to 2055

Output Divider = values in tables 5, 6, 7

Also, the following operating ranges should be observed.

VCOmin < InputFrequency ⋅ -V-- < VCOmaxfreq

R

20kHz < I--n----p---u---t---F----r--e----q---u---e----n---c---y- < 100MHz

R

To determine the best combination of VCO, reference, and output dividers, please use the VersaClock II software

mentioned above. If more information is needed, please contact ICS by sending an e-mail to ics-mk@icst.com.

MDS 307-03 C

8

Revision 101705

Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com

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