8735AY-01 www.idt.com REV. G NOVEMBER 12, 2010
1
ICS8735-01
1:5 DIFFERENTIAL-TO-3.3V LVPECL
ZERO DELAY CLOCK GENERATOR
GENERAL DESCRIPTION
The ICS8735-01 is a highly versatile 1:5 Differential-to-
3.3V LVPECL clock generator. 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
• Five 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
• Lead-Free fully RoHS compliant
BLOCK DIAGRAM PIN ASSIGNMENT
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
32 31 30 29 28 27 26 25
9 10 11 12 13 14 15 16
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17
V
CCO
Q3
nQ3
Q2
nQ2
Q1
nQ1
V
CCO
SEL0
SEL1
CLK0
nCLK0
CLK1
nCLK1
CLK_SEL
MR
VCCO
Q0
nQ0
V
EE
SEL2
FB_IN
nFB_IN
V
CC
VCCO
nQ4
Q4
V
EE
SEL3
V
CCA
PLL_SEL
V
CC
ICS8735-01
PLL_SEL
CLK0
nCLK0
CLK1
nCLK1
CLK_SEL
FB_IN
nFB_IN
SEL0
SEL1
SEL2
SEL3
MR
Q0
nQ0
Q1
nQ1
Q2
nQ2
Q3
nQ3
Q4
nQ4
0
1
PLL
8:1, 4:1, 2:1, 1:1,
1:2, 1:4, 1:8
0
1
÷1, ÷2, ÷4, ÷8,
÷16, ÷32, ÷64
