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Integrated Device Technology Electronic Components Datasheet

ICS291 Datasheet

TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER

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DATASHEET
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



Integrated Device Technology Electronic Components Datasheet

ICS291 Datasheet

TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER

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



Integrated Device Technology Electronic Components Datasheet

ICS291 Datasheet

TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER

No Preview Available !

ICS291 pdf
ICS291
TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER
EPROM CLwOwCwK.DSatYaSNhTeeHt4EUS.coIZmER
External Components
The ICS291 requires a minimum number of external
components for proper operation.
Series Termination Resistor
Clock output traces over one inch should use series
termination. To series terminate a 50trace (a commonly
used trace impedance), place a 33resistor in series with
the clock line, as close to the clock output pin as possible.
The nominal impedance of the clock output is 20.
Decoupling Capacitors
As with any high-performance mixed-signal IC, the ICS291
must be isolated from system power supply noise to perform
optimally.
Decoupling capacitors of 0.01µF must be connected
between each VDD and the PCB ground plane. For
optimum device performance, the decoupling capacitor
should be mounted on the component side of the PCB.
Avoid the use of vias on the decoupling circuit.
Crystal Load Capacitors
The device crystal connections should include pads for
small capacitors from X1 to ground and from X2 to ground.
These capacitors are used to adjust the stray capacitance of
the board to match the nominally required crystal load
capacitance. Because load capacitance can only be
increased in this trimming process, it is important to keep
stray capacitance to a minimum by using very short PCB
traces (and no vias) between the crystal and device. Crystal
capacitors must be connected from each of the pins X1 and
X2 to ground.
The value (in pF) of these crystal caps should equal (CL -6
pF)*2. In this equation, CL= crystal load capacitance in pF.
Example: For a crystal with a 16 pF load capacitance, each
crystal capacitor would be 20 pF [(16-6) x 2 = 20].
ICS291 Configuration Capabilities
The architecture of the ICS291 allows the user to easily
configure the device to a wide range of output frequencies,
for a given input reference frequency.
The frequency multiplier PLL provides a high degree of
precision. The M/N values (the multiplier/divide values
available to generate the target VCO frequency) can be set
within the range of M = 1 to 1024 and N = 1 to 32,895.
The ICS291 also provides separate output divide values,
from 2 through 63, to allow the two output clock banks to
support widely differing frequency values from the same
PLL.
Each output frequency can be represented as:
OutputFreq = REFFreq M-N---
Output Drive Control
The ICS291 has two output drive settings. For VDDO=VDD,
low drive should be selected when outputs are less than 100
MHz. High drive should be selected when outputs are
greater than 100 MHz.
For VDDO<2.8 V, high drive should be selected for all output
frequencies.
(Consult the AC Electrical Characteristics for output rise and
fall times for each drive option.)
IDT VersaClock Software
IDT applies years of PLL optimization experience into a user
friendly software that accepts the user’s target reference
clock and output frequencies and generates the lowest jitter,
lowest power configuration, with only a press of a button.
The user does not need to have prior PLL experience or
determine the optimal VCO frequency to support multiple
output frequencies.
VersaClock software quickly evaluates accessible VCO
frequencies with available output divide values and provides
an easy to understand, bar code rating for the target output
frequencies. The user may evaluate output accuracy,
performance trade-off scenarios in seconds.
Spread Spectrum Modulation
The ICS291 utilizes frequency modulation (FM) to distribute
energy over a range of frequencies. By modulating the
output clock frequencies, the device effectively lowers
energy across a broader range of frequencies; thus,
lowering a system’s electromagnetic interference (EMI). The
modulation rate is the time from transitioning from a
minimum frequency to a maximum frequency and then back
to the minimum.
IDT™ / ICS™ TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER 3
ICS291
REV F 051310




Part Number ICS291
Description TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER
Maker Integrated Device Technology
Total Page 10 Pages
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1 ICS290 Triple PLL Field Prog. Spread Spectrum Clock Synthesizer Integrated Device Technology
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2 ICS291 TRIPLE PLL FIELD PROG. SPREAD SPECTRUM CLOCK SYNTHESIZER Integrated Device Technology
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