ICS8705 ICST [Integrated Circuit Systems], ICS8705 Datasheet

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ICS8705

Manufacturer Part Number
ICS8705
Description
ZERO DELAY, DIFFERENTIAL-TO-LVCMOS/LVTTL CLOCK GENERATOR
Manufacturer
ICST [Integrated Circuit Systems]
Datasheet

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CLK_SEL
8705BY
G
nCLK1 pair can accept most standard differential input lev-
els. The single ended CLK0 input accepts LVCMOS or LVTTL
input levels.The ICS8705 has a fully integrated PLL and can
be configured as zero delay buffer, multiplier or divider and
has an input and output frequency range of 15.625MHz to
250MHz. The reference divider, feedback divider and output
divider are each programmable, thereby allowing for the fol-
lowing 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.
PLL_SEL
HiPerClockS™
ICS
nCLK1
B
FB_IN
ENERAL
CLK0
CLK1
SEL0
SEL1
SEL2
SEL3
MR
LOCK
The ICS8705 is a highly versatile 1:8 Differen-
tial-to-LVCMOS/LVTTL Clock Generator and a
member of the HiPerClockS™ family of High Per-
formance Clock Solutions from ICS. The ICS8705
has two selectable clock inputs. The CLK1,
D
Integrated
Circuit
Systems, Inc.
D
0
1
IAGRAM
ESCRIPTION
8:1, 4:1, 2:1, 1:1,
1:2, 1:4, 1:8
÷2, ÷4, ÷8, ÷16,
÷32
,
÷64, ÷128
PLL
www.icst.com/products/hiperclocks.html
0
1
Z
ERO
1
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
D
F
• 8 LVCMOS/LVTTL outputs, 7Ω typical output impedance
• Selectable CLK1, nCLK1 or LVCMOS/LVTTL clock inputs
• CLK1, nCLK1 pair can accept the following differential
• CLK0 input accepts LVCMOS or LVTTL input levels
• Output frequency range: 15.625MHz to 250MHz
• Input frequency range: 15.625MHz to 250MHz
• VCO range: 250MHz to 500MHz
• External feedback for “zero delay” clock regeneration
• Programmable dividers allow for the following output-to-input
• Fully integrated PLL
• Cycle-to-cycle jitter: 45ps (maximum)
• Output skew: CLK0, 65ps (maximum)
• Static Phase Offset: 25 ±125ps (maximum), CLK0
• Full 3.3V or 2.5V operating supply
• Lead-Free package available
• Industrial temperature information available upon request
input levels: LVPECL, LVDS, LVHSTL, HCSL, SSTL
with configurable frequencies
frequency ratios: 8:1, 4:1, 2:1, 1:1, 1:2, 1:4, 1:8
EATURES
ELAY
P
IN
CLK_SEL
, D
A
nCLK1
SEL0
SEL1
CLK0
CLK1
SSIGNMENT
IFFERENTIAL
MR
nc
CLK1, nCLK1, 55ps (maximum)
1
2
3
4
5
6
7
8
32 31 30 29 28 27 26 25
9 10 11 12 13 14 15 16
7mm x 7mm x 1.4 mm
32-Lead LQFP
Y Package
ICS8705
-
Top View
TO
-LVCMOS/LVTTL
C
LOCK
ICS8705
REV. G JUNE 16, 2004
G
24
23
22
21
20
19
18
17
ENERATOR
V
Q5
GND
Q4
V
Q3
GND
Q2
DDO
DDO

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ICS8705 Summary of contents

Page 1

... The single ended CLK0 input accepts LVCMOS or LVTTL input levels.The ICS8705 has a fully integrated PLL and can be configured as zero delay buffer, multiplier or divider and has an input and output frequency range of 15.625MHz to 250MHz ...

Page 2

... www.icst.com/products/hiperclocks.html 2 ICS8705 - -LVCMOS/LVTTL IFFERENTIAL LOCK ENERATOR ...

Page 3

... www.icst.com/products/hiperclocks.html 3 ICS8705 - -LVCMOS/LVTTL LOCK ENERATOR ...

Page 4

... www.icst.com/products/hiperclocks.html 4 ICS8705 - -LVCMOS/LVTTL IFFERENTIAL LOCK ENERATOR 70° ...

Page 5

... www.icst.com/products/hiperclocks.html 5 ICS8705 - -LVCMOS/LVTTL IFFERENTIAL LOCK ENERATOR 70° ...

Page 6

... www.icst.com/products/hiperclocks.html 6 ICS8705 - -LVCMOS/LVTTL IFFERENTIAL LOCK ENERATOR 70° ...

Page 7

... www.icst.com/products/hiperclocks.html 7 ICS8705 - -LVCMOS/LVTTL IFFERENTIAL LOCK ENERATOR 70° ...

Page 8

... C 2.5V C /2.5V O IRCUIT ORE Qx V CMR UTPUT KEW V DDO 2 20% t ➤ cycle n+1 Clock Outputs cycle n UTPUT ISE www.icst.com/products/hiperclocks.html 8 ICS8705 - -LVCMOS/LVTTL IFFERENTIAL LOCK ENERATOR NFORMATION SCOPE UTPUT OAD EST IRCUIT V DDO 2 V DDO 2 t sk(o) 80% 80% 20 ...

Page 9

... UTPUT UTY YCLE ULSE IDTH ERIOD 8705BY ERO ELAY IFFERENTIAL CLK0 nCLK1 DDO CLK1 Q0:Q7 is the average ➤ mean P D ROPAGATION ELAY V DDO 2 www.icst.com/products/hiperclocks.html 9 ICS8705 - -LVCMOS/LVTTL LOCK ENERATOR V DDO 2 ➤ REV. G JUNE 16, 2004 ...

Page 10

... UPPLY ILTERING ECHNIQUES As in any high speed analog circuitry, the power supply pins are vulnerable to random noise. The ICS8705 provides sepa- rate power supplies to isolate any high switching noise from the outputs to the internal PLL. V should be individually connected to the power supply plane through vias, and bypass capacitors should be used for each pin ...

Page 11

... HiPerClockS Input D F 3B. H NPUT RIVEN BY IGURE RIVER 3.3V 3.3V LVDS_Driv er CLK nCLK HiPerClockS Input 3D. H NPUT RIVEN BY IGURE www.icst.com/products/hiperclocks.html 11 ICS8705 - -LVCMOS/LVTTL IFFERENTIAL LOCK ENERATOR 3. Ohm CLK Ohm nCLK HiPerClockS Input CLK/ CLK I D ...

Page 12

... Circuit Systems, Inc AYOUT UIDELINE The schematic of the ICS8705 layout example is shown in Figure 4A. The ICS8705 recommended PCB board layout for this example is shown in Figure 4B. This layout example is used as a general guideline. The layout in the actual system will VDD Ohm ...

Page 13

... The series termination resistors should be located as close to the driver pins as possible. 50 Ohm Trace C16 C11 Ohm Trace 4B. PCB IGURE OARD AYOUT OR www.icst.com/products/hiperclocks.html 13 ICS8705 - -LVCMOS/LVTTL IFFERENTIAL LOCK ENERATOR GND VDD VIA Other signals C6 C5 ICS8705 REV. G JUNE 16, 2004 ...

Page 14

... Single-Layer PCB, JEDEC Standard Test Boards Multi-Layer PCB, JEDEC Standard Test Boards NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs RANSISTOR OUNT The transistor count for ICS8705 is: 3126 8705BY ERO ELAY ...

Page 15

... ° www.icst.com/products/hiperclocks.html 15 ICS8705 - -LVCMOS/LVTTL IFFERENTIAL LOCK ENERATOR ° REV. G JUNE 16, 2004 ...

Page 16

... L " " " " www.icst.com/products/hiperclocks.html 16 ICS8705 - -LVCMOS/LVTTL IFFERENTIAL LOCK ENERATOR ° ...

Page 17

... " www.icst.com/products/hiperclocks.html 17 ICS8705 - -LVCMOS/LVTTL IFFERENTIAL LOCK ENERATOR ...

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