ICS91719 Datasheet, PDF (1/10 Pages) Integrated Circuit Systems – Low EMI, Spread Modulating, Clock Generator

Integrated
Circuit
Systems, Inc.
ICS91719
Low EMI, Spread Modulating, Clock Generator
Features:
• ICS91719 is a Spread Spectrum Clock targeted for
Mobile PC and LCD panel applications. Generates an
EMI optimized clock signal (EMI peak reduction of 7-
14 dB on 3rd-19th harmonics) through use of Spread
Spectrum techniques.
• ICS91719 focuses on the lower input frequency
range of 14.318 to 80.00 MHz with a spread
modulation of 20kHz to 40kHz.
Pin Configuration
GND 1
X1 _CLKIN 2
X2 3
GNDA 4
VDDA 5
VDD 6
GND 7
16 VDDREF
15 VDDREF_SEL_2.5V/3.3V# ^
14 REF_OUT/VDDREF_SEL_1.8V * *
13 **REF_Stop
12 ^PD#
11 SCLK
10 SDATA
Specifications:
* * CLKOUT/FS_IN0 8
9 ^SPREAD_ENABLE/FS_IN1
• Supply Voltages: VDD = 3.3V ±0.3V
• Frequency range: 14.318 MHz ≤ Fin ≥ 80 MHz
• Cyc to Cyc jitter: <150ps
• Output duty cycle 40/60% (worst case)
16-pin TSSOP
Notes:
** Internal pull-down
^ Internal pull-up
• Guarantees +85°C operational condition.
• 16-pin TSSOP package 4.4mm body (173mils), 0.65
mm pitch
• 14.318 MHz crystal input or reference clock input
• 27MHz, 48MHz and 66MHz reference clock input
Input Select Functionality
FS_IN1
0
0
1
1
FS_IN0
0
1
0
1
MHZ
14.318 in 27.00 out
14.318 in/out
27.00 in/out
48.00 in/out
66.66 in/out
Default Spread %
-0.8% downspread
-0.8% downspread
-0.8% downspread
-0.8% downspread
Block Diagram
CLKIN
SPREAD#
PD#
REF_STOP
SDATA
SCLK
FS_IN0:1
PLL1
Spread
Spectrum
Control
Logic
Config.
Reg.
REFOUT
CLKOUT
REF Voltage Select Functionality
Pin14
0
0
1
1
Pin15
0
1
0
1
REF Voltage
N/A
1.8V
2.5V
3.3V
0506D—08/16/04