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I1819GF-08TR View Datasheet(PDF) - Alliance Semiconductor

Part NameI1819GF-08TR ALSC
Alliance Semiconductor ALSC
DescriptionNotebook LCD Panel EMI Reduction IC
I1819GF-08TR Datasheet PDF : 9 Pages
1 2 3 4 5 6 7 8 9
November 2005
P1819
rev 1.7
DC Electrical Characteristics
(Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated)
Symbol
Parameter
Min
VIL
Input Low voltage
VSS – 0.3
VIH
Input High voltage
2.0
IIL
Input Low current (inputs D_C, PD#, SRS)
-60.0
IIH
Input High current
-
IXOL
XOUT Output low current @ 0.4V, VDD = 3.3V
2.0
IXOH
XOUT Output high current @ 2.5V, VDD = 3.3V
-
VOL
Output Low voltage VDD = 3.3V, IOL = 20mA
-
VOH
Output High voltage VDD = 3.3V, IOH = 20mA
ICC
Dynamic supply current normal mode
3.3V and 25pF probe loading
IDD
Static supply current standby mode
2.5
7.1
fIN - min
-
VDD
Operating Voltage
3.0
tON
Power up time (first locked clock cycle after power up)
-
ZOUT
Clock Output impedance
-
Typ
-
-
-
-
-
-
-
-
-
4.5
3.3
0.18
50
Max
0.8
VDD + 0.3
-20.0
1.0
12.0
12.0
0.4
-
26.9
fIN - max
-
3.6
-
-
Unit
V
V
µA
µA
mA
mA
V
V
mA
mA
V
mS
AC Electrical Characteristics
Symbol
Parameter
fIN
Input Frequency
fOUT
Output Frequency
tLH*
Output Rise time
Measured from 0.8V to 2.0V
tHL*
Output Fall time
Measured from 2.0V to 0.8V
tJC
Jitter (cycle to cycle)
tD
Output Duty cycle
*tLH and tHL are measured into a capacitive load of 15pF
Min
Typ
Max
Unit
20
-
40
MHz
20
-
40
MHz
-
0.66
-
nS
-
-200
45
0.65
-
nS
-
200
pS
50
55
%
Note Book LCD Panel EMI Reduction IC
Notice: The information in this document is subject to change without notice.
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Product Description
The P1819 is a Versatile Spread Spectrum Frequency Modulator designed specifically for input clock frequencies from 20 to 40MHz. (Refer Input Frequency and Modulation Rate Table). The P1819 reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The P1819 allows significant system cost savings by reducing the number of circuit board layers ferrite beads, shielding and other passive components that are traditionally required to pass EMI regulations. The P1819 modulates the output of a single PLL in order to “spread” the bandwidth of a synthesized clock, and more importantly, decreases 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 frequency generators. Lowering EMI by increasing a signal’s bandwidth is called ‘Spread Spectrum Clock Generation’.
The P1819 uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method.

Features
▪ FCC approved method of EMI attenuation.
▪ Provides up to 15dB EMI reduction.
▪ Generates a low EMI Spread Spectrum clock and a non-spread reference clock of the input frequency.
▪ Optimized for Frequency range from 20 to 40MHz.
▪ Internal loop filter minimizes external components and board space.
▪ Selectable spread options: Down and Center.
▪ Low Inherent Cycle-to-Cycle jitter.
▪ Eight spread % selections: ±0.625% to –3.5%.
▪ 3.3V ± 0.3V Operating Voltage range.
▪ Low power CMOS design.
▪ Supports notebook VGA and other LCD timing controller applications.
▪ Power Down function for mobile application.
▪ Available in Commercial temperature range.
▪ Available in 8-pin SOIC and TSSOP Packages.

Applications
  The P1819 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.

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