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ICS844002I-01 Datasheet Preview

ICS844002I-01 Datasheet

CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER

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Integrated
Circuit
Systems, Inc.
ICS844002I-01
FEMTOCLOCKS™CRYSTAL-TO-
LVDS FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS844002I-01 is a 2 output LVDS
ICS Synthesizer optimized to generate Ethernet
HiPerClockS™ reference clock frequencies and is a mem-
ber of the HiPerClocksTM family of high
performance clock solutions from ICS. Using a
25MHz, 18pF parallel resonant crystal, the following
frequencies can be generated based on the 2 frequency
select pins (F_SEL[1:0]): 156.25MHz, 125MHz and
62.5MHz. The ICS844002I-01 uses ICS’ 3rd generation
low phase noise VCO technology and can achieve <1ps
typical rms phase jitter, easily meeting Ethernet jitter
requirements. The ICS844002I-01 is packaged in a small
20-pin TSSOP package.
FEATURES
• Two LVDS outputs
• Selectable crystal oscillator interface
or LVCMOS/LVTTL single-ended input
• Supports the following output frequencies: 156.25MHz,
125MHz, 62.5MHz
• VCO range: 560MHz - 680MHz
• RMS phase jitter @ 156.25MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.41ps (typical)
• Full 2.5V supply mode
• -40°C to 85°C ambient operating temperature
• Available in both, standard and RoHS/Lead-Free compliant
packages
FREQUENCY SELECT FUNCTION TABLE
F_SEL1
0
0
1
1
F_SEL0
0
1
0
1
M Divider N Divider
Value
Value
25 4
25 5
25 10
Not Used
Output Frequency (MHz)
(25MHz Reference)
156.25
125
62.5
Not Used
BLOCK DIAGRAM
F_SEL[1:0] Pulldown
nPLL_SEL Pulldown
REF_CLK Pulldown
25MHz
XTAL_IN
OSC
XTAL_OUT
nXTAL_SEL Pulldown
1
0
2
Phase
Detector
VCO
625MHz
(w/25MHz
Reference)
M = 25 (fixed)
1
0
F_SEL[1:0]
0 0 ÷4
0 1 ÷5
1 0 ÷10
1 1 not used
MR Pulldown
844002AGI-01
www.icst.com/products/hiperclocks.html
1
PIN ASSIGNMENT
nc 1
2 0 VDDO
VDDO 2
19 Q1
Q0 3 18 nQ1
nQ0 4 17 GND
MR 5
16 VDD
nPLL_SEL 6 15 nXTAL_SEL
nc 7 14 REF_CLK
VDDA 8
13 XTAL_IN
F_SEL0 9 12 XTAL_OUT
VDD 10 11 F_SEL1
ICS844002I-01
20-Lead TSSOP
6.5mm x 4.4mm x 0.92mm
package body
G Package
Top View
Q0
nQ0
Q1
nQ1
REV. A JANUARY 5, 2006




ICS

ICS844002I-01 Datasheet Preview

ICS844002I-01 Datasheet

CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER

No Preview Available !

Integrated
Circuit
Systems, Inc.
ICS844002I-01
FEMTOCLOCKS™CRYSTAL-TO-
LVDS FREQUENCY SYNTHESIZER
TABLE 1. PIN DESCRIPTIONS
Number Name
Type
Description
1, 7 nc Unused
No connect.
2, 20
3, 4
VDDO
Q0, nQ0
Power
Ouput
Output supply pins.
Differential output pair. LVDS interface levels.
Active HIGH Master Reset. When logic HIGH, the internal dividers are
5
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.
Selects between the PLL and REF_CLK as input to the dividers.
6 nPLL_SEL Input Pulldown When LOW, selects PLL (PLL Enable). When HIGH, deselects the
reference clock (PLL Bypass). LVCMOS/LVTTL interface levels.
8
9, 11
VDDA
F_SEL0,
F_SEL1
Power
Analog supply pin.
Input Pulldown Frequency select pins. LVCMOS/LVTTL interface levels.
10, 16
12, 13
VDD
XTAL_OUT,
XTAL_IN
Power
Input
Core supply pin.
Parallel resonant crystal interface. XTAL_OUT is the output,
XTAL_IN is the input.
14 REF_CLK Input Pulldown LVCMOS/LVTTL clock input.
Selects between crystal or REF_CLK inputs as the the PLL Reference
15 nXTAL_SEL Input Pulldown source. Selects XTAL inputs when LOW. Selects REF_CLK when HIGH.
LVCMOS/LVTTL interface levels.
17
GND
Power
Power supply ground.
18, 19 nQ1, Q1 Output
Differential output pair. LVDS interface levels.
NOTE: Pulldown refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
CIN
RPULLDOWN
Parameter
Input Capacitance
Input Pulldown Resistor
Test Conditions
Minimum
Typical
4
51
Maximum
Units
pF
kΩ
844002AGI-01
www.icst.com/products/hiperclocks.html
2
REV. A JANUARY 5, 2006


Part Number ICS844002I-01
Description CRYSTAL-TO-LVDS FREQUENCY SYNTHESIZER
Maker ICS
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