ICS91718 Datasheet, PDF (1/11 Pages) Integrated Circuit Systems – Low EMI, Spread Modulating, Clock Generator

Integrated
Circuit
Systems, Inc.
ICS91718
Low EMI, Spread Modulating, Clock Generator
Features:
• ICS91718 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.
• ICS91718 operates with input frequencies at
14.318 - 80 MHz.
• Spread modulation frequency range is 20kHz to
40kHz.
• Spread percentage/type programming through
I²C.
Specifications:
• Supply Voltages: V_DD = 3.3V ±0.3V
• Cyc to Cyc jitter: <150ps
• Output duty cycle 45/55%
• Guarantees +85°C operational condition
• 8-pin SOIC (150 mil) package
Pin Configuration
CLKIN 1
VDD 2
GND 3
**CLKOUT/FS_IN0 4
8 PD#*
7 SCLK
6 SDATA
5 REF_OUT/FS_IN1**
8-pin SOIC & TSSOP
Notes:
* Internal pull-up resistor
** Internal pull-down resistor
Input Select Functionality
FS_IN1 FS_IN0
0
0
0
1
1
0
1
1
MHz
14.318 in
48.00 out
14.318 in
66.66 out
48.00 in/out
66.66 in/out
48.00 in/out
66.66 in/out
SPREAD %
-1.0% down sprd
-1.0% down sprd
-1.0% down sprd
+/-1.0% center sprd
Block Diagram
CLKIN
PLL1
Spread
Spectrum
PD#
FS_IN0:1
SDATA
SCLK
Control
Logic
Config.
Reg.
REFOUT
CLKOUT
0500D—07/15/04