ICS1567
Integrated
Circuit
Systems, Inc.
Differential Output Video Dot Clock Generator
Features
General Description
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High frequency operation for extended video modes - up
to 180 MHz
Compatible with Brooktree high performance RAMDACs
a) Differential output clocks with ECL logic levels
b) Programmable divider modulus for load clock
The ICS1567 is a very high performance monolithic PLL
frequency synthesizer. Utilizing ICS’s advanced CMOS
mixed-mode technology, the ICS1567 provides a low cost
solution for high-end video clock generation, and for telecom
system clock generation.
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c) Circuitry included for automatic reset of Brooktree
RAMDAC pipeline delay
Low cost - eliminates need for multiple ECL crystal clock
oscillators in video display systems
Strobed/Transparent frequency select options
32-user selected mask-programmable frequencies
Fast acquisition of selected frequencies, strobed or non-
strobed
The ICS1567 has differential video clock outputs (CLK and
CLK) that are compatible with industry standard video DACs
& RAMDACs. An additional clock output, LD, is provided,
whose frequency is divided down from the main clock by a
programmable divider.
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Operating frequencies are selectable from a pre-programmed
(customer-defined) table. An on-chip crystal oscillatorfor gen-
erating the reference frequency is provided on the ICS1567.
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Advanced PLL for low phase-jitter
Dynamic control of VCO sensitivity providing optimized
loop gain over entire frequency range
Programming of the ICS1567 is accomplished via frequency
select pins on the package. The ICS1567 has five lines plus a
STROBE pin which permits selection of 32 frequencies. Reset
ofthepipelinedelay onBrooktree RAMDACs is automatically
performed on a rising edge of the STROBE line.
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Small footprint - 16-pin wide body (300 mil) SOIC
Applications
Pin Configuration
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Workstations
High-resolution PC and MAC displays
8514A - TMS340X0 systems
EGA - VGA - Super VGA video
Telecom reference clock generation - suitable for Sonet,
ATM and other data rates up to 155.52Mb.
FS0
XTAL1
XTAL2
STROBE
VSS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
FS1
FS2
FS3
VDD
VDDO
VDDO
CLK
VSS
LD
FS4
CLK
16-Pin SOIC
ICS1567RevB090894
ICSI [ INTEGRATED CIRCUIT SOLUTION INC ]
