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XT
March 2000
This document contains information on a preproduction product. Specifications and information herein are subject to change without notice.
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1.0
Features
•
Dual phase-locked loop (PLL) device with three out-
put clock frequencies
•
3.3V supply voltage
•
Small circuit board footprint (8-pin 0.150
″ SOIC)
•
Custom frequency selections available - contact your
local AMI Sales Representative for more information
Figure 1: Pin Configuration
1
8
2
3
4
7
6
5
SEL
XIN
XOUT
VDD
CLKB
VSS
CLKC
CLKA
8-pin (0.150
″) SOIC
2.0
Description
The FS6284 is a monolithic CMOS clock generator IC
designed to minimize cost and component count in digital
video/audio systems.
All frequencies are ratiometrically derived from the crystal
oscillator frequency. The locking of all the output fre-
quencies together can eliminate unpredictable artifacts in
video systems and reduce electromagnetic interference
(EMI) due to frequency harmonic stacking.
Table 1: Crystal / Output Frequencies
DEVICE
SEL
fXIN
(MHz)
CLKA
(MHz)
CLKB
(MHz)
CLKC
(MHz)
0
81.000
(fXIN* 198 / 35)
FS6284-01
1
14.31818
14.31818
(fXIN)
48.000
(fXIN* 352 / 105)
70.000
(fXIN* 44 / 9)
NOTE: Contact AMI for custom PLL frequencies
Figure 2: Block Diagram
CRYSTAL
OSC.
FS6284
XOUT
XIN
CLKC
CLKA
DIVIDER
ARRAY
PLL
PLL
CLKB
SEL