ICS8735-01 Datasheet, PDF (1/17 Pages) Integrated Circuit Systems – 1:5 DIFFERENTIAL-TO-3.3V LVPECL ZERO DELAY CLOCK GENERATOR

Integrated
Circuit
Systems, Inc.
ICS8735-01
1:5 DIFFERENTIAL-TO-3.3V LVPECL
ZERO DELAY CLOCK GENERATOR
GENERAL DESCRIPTION
ICS
The ICS8735-01 is a highly versatile 1:5 Differ-
ential-to-3.3V LVPECL clock generator and a
HiPerClockS™ _{member of the HiPerClockS™ family of High}
Performance Clock Solutions from ICS. The
ICS8735-01 has a fully integrated PLL and can
be configured as zero delay buffer, multiplier or divider, and
has an output frequency range of 31.25MHz to 700MHz. The
reference divider, feedback divider and output divider are each
programmable, thereby allowing for the following output-to-
input frequency ratios: 8:1, 4:1, 2:1, 1:1, 1:2, 1:4, 1:8. The
external feedback allows the device to achieve “zero delay”
between the input clock and the output clocks. The PLL_SEL
pin can be used to bypass the PLL for system test and debug
purposes. In bypass mode, the reference clock is routed
around the PLL and into the internal output dividers.
FEATURES
• 5 differential 3.3V LVPECL outputs
• Selectable differential clock inputs
• CLKx, nCLKx pair can accept the following differential
input levels: LVPECL, LVDS, LVHSTL, SSTL, HCSL
• Output frequency range: 31.25MHz to 700MHz
• Input frequency range: 31.25MHz to 700MHz
• VCO range: 250MHz to 700MHz
• Programmable dividers allow for the following output-to-input
frequency ratios: 8:1, 4:1, 2:1, 1:1, 1:2, 1:4, 1:8
• External feedback for “zero delay” clock regeneration
with configurable frequencies
• Cycle-to-cycle jitter: 25ps (maximum)
• Output skew: 25ps (maximum)
• Static phase offset: 50ps ± 100ps
• 3.3V supply voltage
• 0°C to 70°C ambient operating temperature
• Industrial temperature information available upon request
BLOCK DIAGRAM
PLL_SEL
CLK0
nCLK0
CLK1
nCLK1
CLK_SEL
FB_IN
nFB_IN
÷1, ÷2, ÷4, ÷8,
÷16, ÷32, ÷64
0
1
PLL
8:1, 4:1, 2:1, 1:1,
1:2, 1:4, 1:8
SEL0
SEL1
SEL2
SEL3
MR
8735AY-01
PIN ASSIGNMENT
Q0
nQ0
Q1
nQ1
0
Q2
32 31 30 29 28 27 26 25
1
nQ2
SEL0 1
2 4 VCCO
Q3
SEL1 2
23 Q3
nQ3
CLK0 3
22 nQ3
Q4
nQ4
nCLK0 4
CLK1 5
ICS8735-01 21 Q2
20 nQ2
nCLK1 6
19 Q1
CLK_SEL 7
18 nQ1
MR 8
1 7 VCCO
9 10 11 12 13 14 15 16
32-Lead LQFP
7mm x 7mm x 1.4mm package body
Y Package
Top View
32-Lead VFQFN
5mm x 5mm x 0.95 package body
K Package
Top View
www.icst.com/products/hiperclocks.html
REV. F NOVEMBER 12, 2004
1