DATASHEET
SERIALLY PROGRAMMABLE CLOCK SOURCE
ICS307-03
Description
Features
The ICS307-03 is a dynamic, serially programmable clock
source which is flexible and takes up minimal board space.
Output frequencies are programmed via a 3-wire SPI port.
• Crystal or clock reference input
• 3.3 V CMOS outputs
• Three outputs can be individually configured or shut off
• Small 16-pin TSSOP package
An advanced PLL coupled to an array of configurable
output dividers and three outputs allows low-jitter
generation of frequencies from 200 Hz to 270 MHz.
• Reprogrammable during operation
• 3-wire SPI serial interface
The device can be reprogrammed during operation, making
it ideal for applications where many different frequencies
are required, or where the output frequency must be
determined at run time. Glitch-free frequency transitions,
where the clock period changes slightly over many cycles,
are possible.
• Glitch-free output frequency switching
• User selectable charge pump current and damping
resistor
• Power-down control via hardware pin or software control
bit
• Programming word can be generated by IDT VersaClock
II Software
• Directly programmable via VersaClock II Software and a
Windows PC parallel port
• Available in Pb (lead) free package, RoHS 5/6 compliant
• Industrial temperature range available
NOTE: EOL for non-green parts to occur on 5/13/10 per
PDN U-09-01
Block Diagram
Charge Pump
(Table 3)
(Table 1)
Resistor
(Table 4)
REF Divide
CP
300
pF
Divider
2 - 8232
CLK1
11pF
X1
X2
1-2055
[Bit 110]
[Bit 122]
(Table 5)
VCO DIVIDE
12-2055
(Table 2)
1
0
Divider
2 - 34
CLK2
CLK3
[Bit 111]
[Bit 129]
DIN
CS
[Bit 123]
(Table 6)
Programming
Register
(132 bits)
SCLK
1
0
Divider
2 - 34
[Bit 124]
(Table 7)
IDT™ / ICS™ SERIALLY PROGRAMMABLE CLOCK SOURCE
1
ICS307-03
REV J 090209
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
