ICS2572 Просмотр технического описания (PDF) - Integrated Circuit Systems
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ICS2572 Datasheet PDF : 10 Pages
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Integrated
Circuit
Systems, Inc.
ICS2572
User-Programmable Dual High-Performance Clock Generator
Description
The ICS2572 is a dual-PLL (phase-locked loop) clock gener-
ator with differential video outputs specifically designed for
high-resolution, high-refresh rate, video applications. The
video PLL generates any of 16 pre-programmed frequencies
through selection of the address lines FS0-FS3. Similarly, the
auxiliary PLL can generate any one of four pre-programmed
frequencies via the MS0 & MS1 lines.
A unique feature of the ICS2572 is the ability to redefine
frequency selections after power-up. This permits complete
set-up of the frequency table upon system initialization.
Features
• Advanced ICS monolithic phase-locked loop
technology
• Supports high-resolution graphics - differential CLK out-
put to 185 MHz
• Divided dotclock output (LOAD) available
• Simplified device programming
• Sixteen selectable VCLK frequencies (all user
re-programmable)
• Four selectable MCLK frequencies (all user
re-programmable)
• Windows NT compatible
Applications
• High end PC/low end workstation graphics designs
requiring differential output
• X Terminal graphics
Block Diagram
XTAL1
XTAL2
Crystal
Oscillator
Reference
Divider
EXTFREQ
/1, 4, 5 or 8
LOAD
/2
Phase-
Frequency
Comparator
Charge
Pump
VCO
/4
Prescaler
/8
/M
/A
MCLK PLL (as above)
/2
Strobe
FS0
VCLK Set &
FS1
Program
/4
FS2
Mode
Interface
FS3
MS0
MCLK Set
/8
MS1
CLK+
CLK-
MCLK
ICS2572RevC090894
E-95
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