P2180 / 81 / 82 / 83 / 84
Peak Reducing EMI Solution
Features
FCC approved method of EMI attenuation.
Provides up to 15dB EMI reduction.
Generates a 1X low EMI spread spectrum clock from
the input frequency.
Optimized for frequency range:
o
P2180 / 84: 20MHz to 40MHz
o
P2181: 60MHz to 160MHz
o
P2182 / 83: 10MHz to 20MHz
Internal loop filter minimizes external components
and board space.
Selectable spread options: Down Spread and Center
Spread.
Low inherent cycle-to-cycle jitter.
Eight spread % selections:
o
± 0.625% to -3.5%.
3.3V operating voltage.
CMOS/TTL compatible inputs and outputs.
Low-power CMOS design.
Supports notebook VGA and other LCD timing
controller applications.
Drop-in replacement to Cypress W180/1.
Products are available for industrial temperature
range.
Available in 8-pin SOIC and TSSOP packages.
clock form an OSC or a system generated clock. The
P2180/81A to P2180/81D offer various combinations of
spread options and percentage deviations.
(Refer
to
Spread Deviation Selections Table.)
These combinations
include Down and Center Spread and percentage
deviation range from ± 0.625% to –3.50%.
The P2180/81X reduces electromagnetic interference
(EMI) at the clock source, allowing system wide reduction
of EMI of down stream clock and data dependent signals.
The P2180/81X allows significant system cost savings by
reducing the number of circuit board layers and shielding
that are traditionally required to pass EMI regulations.
The P2180/81X modulates the output of a single PLL in
order to “spread” the bandwidth of a synthesized clock,
thereby decreasing the peak amplitudes of its harmonics.
This results in significantly lower system EMI compared
to the typical narrow band signal produced by oscillators
and most clock generators. Lowering EMI by increasing a
signal’s bandwidth is called spread spectrum clock
generation.
The P2180/81X uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented by using a proprietary all-digital method.
Applications
The P2180/81X is targeted towards EMI management for
memory and LVDS interfaces in mobile graphic chipsets
and high-speed digital applications such as PC peripheral
devices, consumer electronics, and embedded controller
systems.
Product Description
The P2180/81X is a versatile spread spectrum frequency
modulator designed specifically for a wide range of clock
frequencies from 20MHz to 40MHz and 60MHz to
160MHz
(Refer
to
Input Frequency and Modulation Rate
Table.)
The P2180/81X can generate an EMI reduced
©2010 SCILLC. All rights reserved.
JANUARY 2010 – Rev. 2
Publication Order Number:
P2180/D
P2180 / 81 / 82 / 83 / 84
Input Frequency and Modulation Rate
Part Number
P2180/P2184
P2181
P2182/P2183
Input Frequency Range (MHz)
20 to 40
60 to 160
10 to 20
Output Frequency Range (MHz)
20 to 40
60 to 160
10 to 20
Modulation Rate
Input frequency / 768
Input frequency / 2048
TBD
Spread Deviation Selections
Part Number
P2180/1/2/3/4
A
P2180/1/2/3/4
B
P2180/1/2/3/4
C
P2180/1/2/3/4
D
SRS
0
1
0
1
0
1
0
1
Spread Deviation
-1.25% (Down)
-1.75% (Down)
±1.25% (Center)
±1.75% (Center)
-2.50% (Down)
-3.50 (Down)
±0.625%(Center)
±0.875% (Center)
Absolute Maximum Ratings
Symbol
VDD, V
IN
T
STG
T
A
T
s
T
J
T
DV
Storage temperature
Operating temperature
Parameter
Rating
-0.5 to +4.6
-65 to +125
0 to +70
260
150
2
Unit
V
°C
°C
°C
°C
KV
Voltage on any pin with respect to Ground
Max. Soldering Temperature (10 sec)
Junction Temperature
Static Discharge Voltage (As per JEDEC STD22- A114-B)
Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect
device reliability.
Rev. 2 | Page 3 of 8 | www.onsemi.com
P2180 / 81 / 82 / 83 / 84
DC Electrical Characteristics
Unless otherwise noted, V
DD
= 3.3V and T
A
=25°C.
Symbol
V
IL
V
IH
I
IL
I
IH
I
XOL
I
XOH
V
OL
V
OH
I
CC
I
DD
V
DD
t
ON
Z
OUT
Input low voltage
Input high voltage
Parameter
Min
GND – 0.3
-
-60.0
-
2.00
-
-
2.8
8.6 f
IN
- min
-
-
-
-
Typ
-
-
-
-
-
-
-
-
-
4.5
3.3
-
-
Max
0.8
V
DD
+ 0.3
-20.0
1.00
12.00
12.00
0.4
-
27.0 f
IN
- max
-
-
-
-
Unit
V
V
µA
µA
mA
mA
V
V
mA
mA
V
mS
Input low current (input SRS)
Input high current
X
OUT
output low current (@ 0.4V, V
DD
= 3.3V)
X
OUT
output high current (@ 2.5V, V
DD
= 3.3V)
Output low voltage (V
DD
= 3.3V, I
OL
= 20mA)
Output high voltage (V
DD
= 3.3V, I
OH
= 20mA)
Dynamic supply current normal mode (3.3V and
10pF loading)
Static supply current standby mode
Operating voltage
Power up time (first locked clock cycle after power
up)
Clock output impedance
AC Electrical Characteristics
Symbol
f
IN
f
OUT
t
LH
1
1
t
HL
Parameter
Min
10
10
-
-
-200
45
Typ
-
-
0.69
0.66
-
50
Max
160
160
-
-
200
55
Unit
MHz
MHz
ns
ns
ps
%
Input frequency
Output frequency
Output rise time (measured at 0.8V to 2.0V)
Output fall time (measured at 2.0V to 0.8V)
Jitter (cycle-to-cycle)
Output duty cycle
t
JC
t
D
Note: 1. t
LH
and t
HL
are measured into a capacitive load of 15pF.
Rev. 2 | Page 4 of 8 | www.onsemi.com
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