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ICS844252-04 Datasheet Preview

ICS844252-04 Datasheet

CRYSTAL-TO-LVDS CLOCK GENERATOR

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Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844252-04
FEMTOCLOCKS™ CRYSTAL-TO-
LVDS CLOCK GENERATOR
GENERAL DESCRIPTION
FEATURES
The ICS844252-04 is a 10Gb/12Gb Ethernet
ICS Clock Generator and a member of the
HiPerClockS™ HiPerClocksTM family of high perfor mance
devices from ICS. The ICS844252-04 can
synthesize 10 Gigabit Ethernet and 12 Gigabit
Ethernet with a 25MHz crystal. It can also generate SATA
and 10Gb Fibre Channel reference clock frequencies with
the appropriate choice of crystals. The ICS844252-04 has
excellent phase jitter performance and is packaged in a
small 16-pin TSSOP, making it ideal for use in systems with
limited board space.
Two differential LVDS outputs
Crystal oscillator interface designed for
18pF parallel resonant crystals
Crystal input frequency range: 19.33MHz - 30MHz
Output frequency range: 145MHz - 187.5MHz
VCO frequency range: 580MHz - 750MHz
RMS phase jitter at 156.25MHz (1.875MHz - 20MHz):
0.36ps (typical)
3.3V operating supply
0°C to 70°C ambient operating temperature
Industrial temperature information available upon request
CONFIGURATION TABLE WITH 25MHZ CRYSTAL
Available in both standard and lead-free compliant
packages
Inputs
Crystal Frequency Feedback VCO Frequency
(MHz)
Divide
(MHz)
N Output Divide
Output Frequency
(MHz)
Application
25 30 750
4
187.5
12 Gigabit Ethernet
25 25 625
4
156.25
10 Gigabit Ethernet
CONFIGURATION TABLE WITH SELECTABLE CRYSTALS
Inputs
Crystal Frequency Feedback VCO Frequency
(MHz)
Divide
(MHz)
20 30 600
21.25
30 637.5
24 25 600
25.5
25 637.5
30 25 750
N Output Divide
4
4
4
4
4
Output Frequency
(MHz)
Application
150
159.375
150
159.375
187.5
SATA
10 Gigabit Fibre Channel
SATA
10 Gigabit Fibre Channel
12 Gigabit Ethernet
BLOCK DIAGRAM
OE Pullup
nPLL_SEL
Pulldown
REF_CLK
Pulldown
1
XTAL_IN
XTAL_OUT
CLK_SEL
OSC
Pulldown
0
D
Q
LE
Phase
Detector
1
VCO
580MHz-750MHz
0
DIV. N
÷4
0 = ÷25 (default)
1 = ÷30
PIN ASSIGNMENT
nQ1 1
Q1 2
VDDO 3
OE 4
nPLL_SEL 5
VDDO 6
Q0 Q0 7
nQ0 nQ0 8
16 XTAL_IN
15 XTAL_OUT
14 GND
13 REF_CLK
12 CLK_SEL
11 VDD
10 VDDA
9 FREQ_SEL
Q1
nQ1
ICS844252-04
16-Lead TSSOP
4.4mm x 5.0mm x 0.92mm
package body
G Package
Top View
FREQ_SEL
Pulldown
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.
844252AG-04
www.icst.com/products/hiperclocks.html
REV. A JANUARY 26, 2006
1




ICS

ICS844252-04 Datasheet Preview

ICS844252-04 Datasheet

CRYSTAL-TO-LVDS CLOCK GENERATOR

No Preview Available !

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS844252-04
FEMTOCLOCKS™ CRYSTAL-TO-
LVDS CLOCK GENERATOR
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1, 2
nQ1, Q1
Output
Differential clock outputs. LVDS interface levels.
3, 6
VDDO
Power
Output supply pins.
Output enable. When HIGH, clock outputs follow clock input.
4 OE Input Pullup When LOW, Qx outputs are forced low, nQx outputs are forced high.
LVCMOS/LVTTL interface levels.
Selects between the PLL and reference clock as input to the divider.
5
nPLL_SEL
Input Pulldown When Low, selects PLL. When High, selects reference clock.
LVCMOS/LVTTL interface levels.
7, 8
Q0, nQ0
Output
Differential clock outputs. LVDS interface levels.
9 FREQ_SEL Input Pulldown Frequency select pin. LVCMOS/LVTTL interface levels.
10
VDDA
Power
Analog supply pin.
11 VDD Power
Core supply pin.
12
CLK_SEL
Input
Pulldown
Clock select input. When Low, selects crystal inputs. When High,
selects REF_CLK. LVCMOS/LVTTL interface levels.
13
REF_CLK
Input Pulldown Reference clock input. LVCMOS/LVTTL interface levels.
14
GND
Power
Power supply ground.
15, 16
XTAL_OUT,
XTAL_IN
Input
Crystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characterristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
C
IN
RPULLUP
RPULLDOWN
Parameter
Input Capacitance
Input Pullup Resistor
Input Pulldown Resistor
Test Conditions
Minimum
Typical
4
51
51
Maximum
Units
pF
kΩ
kΩ
844252AG-04
www.icst.com/products/hiperclocks.html
2
REV. A JANUARY 26, 2006


Part Number ICS844252-04
Description CRYSTAL-TO-LVDS CLOCK GENERATOR
Maker ICS
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