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ICS291

TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER



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TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER ICS291
Description
The ICS291 field programmable spread spectrum clock
synthesizer generates up to six high-quality, high-frequency
clock outputs including multiple reference clocks from a
low-frequency crystal input. It is designed to replace
crystals, crystal oscillators and stand alone spread
spectrum devices in most electronic systems.
Using IDT’s VersaClockTM software to configure PLLs and
outputs, the ICS291 contains a One-Time Programmable
(OTP) ROM for field programmability. Programming
features include input/output frequencies, spread spectrum
amount, eight selectable configuration registers and up to
two sets of three low-skew outputs.
Each of the two output groups are powered by a separate
VDDO voltage. VDDO may vary from 1.8 V to VDD.
Using Phase-Locked Loop (PLL) techniques, the device
runs from a standard fundamental mode, inexpensive
crystal, or clock. It can replace multiple crystals and
oscillators, saving board space and cost.
The ICS291 is also available in factory programmed custom
versions for high-volume applications.
Features
Packaged as 20-pin TSSOP – Pb-free, RoHS compliant
Eight addressable registers
Replaces multiple crystals and oscillators
Output frequencies up to 200 MHz at 3.3 V
Configurable Spread Spectrum Modulation
Input crystal frequency of 5 to 27 MHz
Clock input frequency of 3 to 166 MHz
Up to six reference outputs
Separate 1.8 to 3.3 V VDDO output level controls for
each bank of 3 outputs
Up to two sets of three low-skew outputs
Operating voltages of 3.3 V
Controllable output drive levels
Advanced, low-power CMOS process
Block Diagram
VDD 3
VDDO1
S2:S0 3
OTP
ROM
with PLL
Values
X1/ICLK
Crystal or
Clock Input
X2
Crystal
Oscillator
External capacitors
are required with a crystal input.
PLL1 with
Spread
Spectrum
PLL2
PLL3
Divide
Logic
and
Output
Enable
Control
CLK1
CLK2
CLK3
CLK4
CLK5
CLK6
GND 3
PDTS
VDDO2
IDT™ / ICS™ TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER 1
ICS291
REV F 051310



No Preview Available !

ICS291 pdf
ICS291
TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER
Pin Assignment
EPROM CLwOwCwK.DSatYaSNhTeeHt4EUS.coIZmER
GND
S0
S1
VDD
VDDO1
CLK1
CLK2
CLK3
GND
X1/ICLK
1
2
3
4
5
6
7
8
9
10
20 S2
19 VDD
18 PDTS
17 GND
16 CLK6
15 CLK5
14 CLK4
13 VDDO2
12 VDD
11 X2
20 pin (173 mil) TSSOP
Pin Descriptions
Pin
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Pin
Name
GND
S0
S1
VDD
VDDO1
CLK1
CLK2
CLK3
GND
X1/ICLK
X2
VDD
VDDO2
CLK4
CLK5
CLK6
GND
PDTS
VDD
S2
Pin
Type
Power
Input
Input
Power
Power
Output
Output
Output
Power
XI
XO
Power
Power
Output
Output
Output
Power
Input
Power
Input
Pin Description
Connect to ground.
Select pin 0. Internal pull-up resistor.
Select pin 1. Internal pull-up resistor.
Connect to +3.3 V.
Power supply for outputs CLK1-CLK3.
Output clock 1. Weak internal pull-down when tri-state.
Output clock 2. Weak internal pull-down when tri-state.
Output clock 3. Weak internal pull-down when tri-state.
Connect to ground.
Crystal input. Connect this pin to a crystal or external input clock.
Crystal Output. Connect this pin to a crystal. Float for clock input.
Connect to +3.3 V.
Power supply for outputs CLK4-CLK6.
Output clock 4. Weak internal pull-down when tri-state.
Output clock 5. Weak internal pull-down when tri-state.
Output clock 6. Weak internal pull-down when tri-state.
Connect to ground.
Power-down tri-state. Powers down entire chip and tri-states clock outputs
when low. Internal pull-up resistor.
Connect to +3.3 V.
Select pin 2. Internal pull-up resistor.
IDT™ / ICS™ TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER 2
ICS291
REV F 051310



Part Number ICS291
Description TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER
Maker Integrated Device Technology - Integrated Device Technology
Total Page 10 Pages
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