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ICS84427 Datasheet Preview

ICS84427 Datasheet

CRYSTAL-TO-LVDS INTEGRATED FREQUENCY SYNTHESIZER/FANOUT BUFFER

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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS84427
CRYSTAL-TO-LVDS
INTEGRATED FREQUENCY SYNTHESIZER/FANOUT BUFFER
GENERAL DESCRIPTION
The ICS84427 is a Crystal-to-LVDS Frequency
ICS Synthesizer/Fanout Buffer and a member of the
HiPerClockS™ HiPerClockS™ family of High Performance Clock
Solutions from ICS. The output frequency can be
programmed using the frequency select pins. The
low phase noise characteristics of the ICS84427 make it an
ideal clock source for 10 Gigabit Ethernet, 10 Gigabit Fibre
Channel, OC3 and OC12 applications.
FUNCTION TABLE
Inputs
F_XTAL MR F_SEL2 F_SEL1
X 1X
X
19.44MHz 0
1
0
19.44MHz 0
1
0
19.44MHz 0
1
1
19.44MHz 0
1
1
25MHz 0
0
0
25MHz 0
0
0
25MHz 0
0
1
25MHz 0
0
1
25.5MHz 0
0
0
F_SEL0
X
0
1
0
1
0
1
0
1
1
Output
Frequency
F_OUT
LOW
77.76MHz
155.52MHz
311.04MHz
622.08MHz
78.125MHz
156.25MHz
312.5 MHz
625MHz
159.375MHz
FEATURES
Six LVDS outputs
Crystal oscillator interface
Output frequency range: 77.76MHz to 625MHz
Crystal input frequency: 19.44MHz, 25MHz or 25.5MHz
RMS phase jitter at 155.52MHz, using a 19.44MHz crystal
(12kHz to 20MHz): 3.4ps (typical)
Phase noise:
Offset
Noise Power
100Hz ................. -95 dBc/Hz
1kHz ............... -110 dBc/Hz
10kHz ............... -120 dBc/Hz
100kHz ............... -121 dBc/Hz
3.3V supply voltage
0°C to 70°C ambient operating temperature
Industrial temperature information available upon request
Available in both standard and lead-free RoHS-compliant
packages
BLOCK DIAGRAM
XTAL_IN
XTAL_OUT
OSC
PLL
/0 6 Q0:Q5
Output
/1
Divider
6 nQ0:nQ5
Feedback
Divider
F_SEL2 MR PLL_SEL F_SEL1
F_SEL0
PIN ASSIGNMENT
Q0
nQ0
Q1
nQ1
Q2
nQ2
Q3
nQ3
Q4
nQ4
Q5
nQ5
1
2
3
4
5
6
7
8
9
10
11
12
24 VDD
23 F_SEL0
22 F_SEL1
21 MR
20 XTAL_IN
19 XTAL_OUT
18 F_SEL2
17 VDDA
16 VDD
15 PLL_SEL
14 GND
13 VDD
ICS84427
24-Lead, 300-MIL SOIC
7.5mm x 15.33mm x 2.3mm body package
M Package
Top View
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.
84427CM
www.icst.com/products/hiperclocks.html
REV. D NOVEMBER 30, 2005
1




ICS

ICS84427 Datasheet Preview

ICS84427 Datasheet

CRYSTAL-TO-LVDS INTEGRATED FREQUENCY SYNTHESIZER/FANOUT BUFFER

No Preview Available !

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS84427
CRYSTAL-TO-LVDS
INTEGRATED FREQUENCY SYNTHESIZER/FANOUT BUFFER
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1, 2 Q0, nQ0 Output
Differential output pair. LVDS interface levels.
3, 4 Q1, nQ1 Output
Differential output pair. LVDS interface levels.
5, 6 Q2, nQ2 Output
Differential output pair. LVDS interface levels.
7, 8 Q3, nQ3 Output
Differential output pair. LVDS interface levels.
9, 10
Q4, nQ4 Output
Differential output pair. LVDS interface levels.
11, 12
Q5, nQ5 Output
Differential output pair. LVDS interface levels.
13, 16, 24
14
15
VDD
GND
PLL_SEL
Power
Input
Pullup
Core supply pins.
Power supply ground.
Selects between the PLL and crystal inputs as the input to the dividers.
When HIGH, selects PLL. When LOW, selects XTAL_IN and
XTAL_OUT. LVCMOS / LVTTL interface levels.
17
VDDA
Power
Analog supply pin.
18
F_SEL2
Input Pullup Feedback frequency select pin. LVCMOS/LVTTL interface levels.
19,
20
XTAL_OUT,
XTAL_IN
Input
Crystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
Active High Master Reset. When logic HIGH, the internal dividers are
21
MR
Input
Pulldown
reset causing the true outputs Qx to go low and the inverted outputs
nQx to go high. When logic LOW, the internal dividers and the outputs
are enabled. LVCMOS / LVTTL interface levels.
22
F_SEL1
Input Pulldown Output frequency select pin. LVCMOS/LVTTL interface levels.
23
F_SEL0
Input Pullup Output frequency select pin. LVCMOS/LVTTL interface levels.
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
CIN
RPULLUP
R
PULLDOWN
Parameter
Input Capacitance
Input Pullup Resistor
Input Pulldown Resistor
Test Conditions
Minimum
Typical
4
51
51
Maximum
Units
pF
kΩ
kΩ
84427CM
www.icst.com/products/hiperclocks.html
2
REV. D NOVEMBER 30, 2005


Part Number ICS84427
Description CRYSTAL-TO-LVDS INTEGRATED FREQUENCY SYNTHESIZER/FANOUT BUFFER
Maker ICS
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