ICS1567 Datasheet, PDF (1/11 Pages) Integrated Circuit Systems – Differential Output Video Dot Clock Generator

Integrated
Circuit
Systems, Inc.
ICS1567
Differential Output Video Dot Clock Generator
General Description
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.
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.
Operating frequencies are selectable from a pre-programmed
(customer-defined) table. An on-chip crystal oscillator for gen-
erating the reference frequency is provided on the ICS1567.
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
of the pipeline delay on Brooktree RAMDACs is automatically
performed on a rising edge of the STROBE line.
Features
• 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
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
• Advanced PLL for low phase-jitter
• Dynamic control of VCO sensitivity providing optimized
loop gain over entire frequency range
• Small footprint - 16-pin wide body (300 mil) SOIC
Applications
Pin Configuration
• Workstations
• High-resolution PC and MAC displays
• 8514A - TMS340X0 systems
• EGA - VGA - Super VGA video
• Telecom reference clock generation - suitable for Sonet,
FS0 1
16
ATM and other data rates up to 155.52Mb.
XTAL1 2
15
XTAL2 3
14
STROBE 4
13
VSS 5
12
VSS 6
11
LD 7
10
FS4 8
9
FS1
FS2
FS3
VDD
VDDO
VDDO
CLK
CLK
16-Pin SOIC
ICS1567RevB090894