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Integrated Device Technology Electronic Components Datasheet

ICS307-02 Datasheet

SERIALLY PROGRAMMABLE CLOCK SOURCE

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ICS307-02 pdf
SERIALLY PROGRAMMABLE CLOCK SOURCE
DATASHEET
ICS307-01/-02
Description
The ICS307-01 and ICS307-02 are versatile serially
programmable clock sources which take up very little
board space. They can generate any frequency from 6
to 200 MHz and have a second configurable output.
The outputs can be reprogrammed on the fly and will
lock to a new frequency in 10 ms or less. Smooth
transitions (in which the clock duty cycle remains near
50%) are guaranteed if the output divider is not
changed.
The devices includes a PDTS pin which tri-states the
output clocks and powers down the entire chip.
The ICS307-02 features a default clock output at
start-up and is recommended for all new designs.
This product is intended for clock generation. It has low
output jitter (variation in the output period), but input to
output skew and jitter are not defined nor guaranteed.
For applications which require defined input to output
skew, use the ICS527-01.
Features
Packaged in 16-pin (150 mil wide) SOIC – Pb-free,
RoHS compliant
Highly accurate frequency generation
Serially programmable: user determines the output
frequency via a 3 wire interface
Eliminates need for custom quartz
Input crystal frequency of 5 - 27 MHz
Output clock frequencies up to 200 MHz
Power down tri-state mode
Very low jitter
Operating voltage of 3.3 V or 5 V
25 mA drive capability at TTL levels
Industrial temperature version available
Block Diagram
SCLK
DATA
STROBE
X1/ICLK
Crystal or
clock input
X2
TTL
9 V8:V0
Shift
Register
2
3
2
7
C1:C0
S2:S0
F1:F0
R6:R7
Crystal
Oscillator
Reference
Divider
Optional crystal capacitors
VDD
VCO
Divider
Phase Comparator,
Charge Pump, and
Loop Filter
VCO
GND
Output
Divider
3
S2:S0
Function
Select
3
F1:F0
CLK1
PDTS
CLK2
IDT™ / ICS™ SERIALLY PROGRAMMABLE CLOCK SOURCE
1
ICS307-01/-02 REV J 051310



Integrated Device Technology Electronic Components Datasheet

ICS307-02 Datasheet

SERIALLY PROGRAMMABLE CLOCK SOURCE

No Preview Available !

ICS307-02 pdf
ICS307-01/-02
SERIALLY PROGRAMMABLE CLOCK SOURCE
SER PROG CLOCK SYNTHESIZER
Pin Assignment
X1/ICLK
NC
VDD
NC
GND
CLK2
NC
SCLK
1
2
3
4
5
6
7
8
16 X2
15 NC
14 NC
13 PDTS
12 DATA
11 CLK1
10 NC
9 STROBE
16 pin (150 mil) SOIC
Pin Descriptions
Pin
Number
Pin
Name
1 X1/ICLK
2 NC
3 VDD
4 NC
5 GND
6 CLK2
7 NC
8 SCLK
9 STROBE
10 NC
11 CLK1
12 DATA
13 PDTS
14 NC
15 NC
16 X2
Pin
Type
XI
-
Power
-
Power
Output
-
Input
Input
-
Output
Input
Input
-
-
XO
Pin Description
Crystal connection (REF frequency). Connect to a parallel resonant crystal or an
input clock.
No connect. Do not connect anything to this pin.
Connect to 3.3 V or 5 V.
No connect. Do not connect anything to this pin.
Connect to ground.
Output clock 2, determined by F0 - F1. Can be reference, REF/2, CLK1/2 , or off.
No connect. Do not connect anything to this pin.
Serial clock. See timing diagram.
Strobe to load data. See timing diagram.
No connect. Do not connect anything to this pin.
Output clock 1, determined by R0 - R6, V0 - V8, S0 - S2, and input frequency.
Data input. Serial input for three words which set the output clock(s).
Powers down entire chip, tri states CLK1 and CLK2 outputs when low. Internal
pull-up.
No connect. Do not connect anything to this pin.
No connect. Do not connect anything to this pin.
Input crystal connection. Connect to a crystal or leave unconnected for clock
input.
IDT™ / ICS™ SERIALLY PROGRAMMABLE CLOCK SOURCE
2
ICS307-01/-02 REV J 051310



Integrated Device Technology Electronic Components Datasheet

ICS307-02 Datasheet

SERIALLY PROGRAMMABLE CLOCK SOURCE

No Preview Available !

ICS307-02 pdf
ICS307-01/-02
SERIALLY PROGRAMMABLE CLOCK SOURCE
SER PROG CLOCK SYNTHESIZER
Determining the Output Frequency
On power-up, the ICS307-01 on-chip registers can have
random values so almost any frequency may be output
from the part. CLK1 will always have some clock signal
present, but CLK2 could possibly be OFF (low).
The ICS307-02 on-chip registers are initially configured
to provide a x1 output clock on both the CLK1 and CLK2
outputs. The output frequency will be the same as the
input clock or crystal. This is useful if the ICS307 will
provide the initial system clock at power-up. Since this
feature is an advantage in most systems, the
ICS307-02 is recommended for new designs.
With programming, the user has full control in changing
the desired output frequency to any value over the
range shown in Table 1 on page 4. The output of the
ICS307 can be determined by the following equation:
And for the industrial temperature range:
60MHz < InputFrequency 2 R-V----DD-----WW-------++-----82-- < 360MHz
200kHz < -I-n----p---u-R--t--D--F---Wr--e----q-+--u---2e----n---c---y-
To determine the best combination of VCO, reference,
and output dividers, see the online calculator at
www.idt.com or contact IDT by sending an e-mail to
ics-mk@icst.com with the desired input crystal or clock
and the desired output frequency.
CLK1Frequency = InputFrequency 2 (---R-----D---V-W----D---+-W----2----+)-----8----O-----D---
Where:
VCO Divider Word (VDW) = 4 to 511 (0, 1, 2, 3
are not permitted)
Reference Divider Word (RDW) = 1 to 127 (0 is
not permitted)
Output Divider = values on page 4
The following operating ranges should be observed. For
the commercial temperature range:
55MHz < InputFrequency 2 R-V----DD-----WW-------++-----82-- < 400MHz
200kHz < -I--n---p----u-R---t--FD----r-W-e----q--+-u----2e----n---c----y-
IDT™ / ICS™ SERIALLY PROGRAMMABLE CLOCK SOURCE
3
ICS307-01/-02 REV J 051310




Part Number ICS307-02
Description SERIALLY PROGRAMMABLE CLOCK SOURCE
Maker IDT
Total Page 10 Pages
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ICS307-02 pdf
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