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Integrated Device Technology Electronic Components Datasheet



ICS22002I-01

CRYSTAL-TOLVHSTL FREQUENCY SYNTHESIZER



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PRELIMINARY
FEMTOCLOCKS™ CRYSTAL-TO-
LVHSTL FREQUENCY SYNTHESIZER
General Description
The ICS8422002I-01 is a 2 output LVHSTL
ICS Synthesizer optimized to generate Ethernet
HiPerClockS™ reference clock frequencies and is a member of the
HiPerClocksTM family of high performance clock
solutions from IDT. 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 ICS8422002I-01 uses IDT’s 3rd
generation low phase noise VCO technology and can achieve 1ps
or lower typical rms phase jitter, easily meeting Ethernet jitter
requirements. The ICS8422002I-01 is packaged in a small 20-pin
TSSOP package.
Block Diagram
F_SEL[1:0] Pulldown
nPLL_SEL Pulldown
2
REF_CLK Pulldown
25MHz
XTAL_IN
OSC
XTAL_OUT
nXTAL_SEL Pulldown
1
0
Phase
Detector
VCO
1
0
ICS8422002I-01
Features
Two LVHSTL outputs (VOHmax = 1.2V)
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): 0.44ps (typical)
Power supply modes:
Core/Output
3.3V/1.8V
2.5V/1.8V
-40°C to 85°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
Pin Assignment
nc
VDDO
Q0
nQ0
MR
nPLL_SEL
nc
VDDA
F_SEL0
VDD
1
2
3
4
5
6
7
8
9
10
20 VDDO
19 Q1
18 nQ1
17 GND
16 VDD
15 nXTAL_SEL
14 REF_CLK
13 XTAL_IN
12 XTAL_OUT
11 F_SEL1
ICS422002I-01
20-Lead TSSOP
6.5mm x 4.4mm x 0.925mm package body
G Package
Top View
F_SEL[1:0]
0 0 ÷4
0 1 ÷5
1 0 ÷10
1 1 Not Used
Q0
nQ0
Q1
nQ1
M = 25 (fixed)
MR Pulldown
The Preliminary Information presented herein represents a product in pre-production. The noted characteristics are based on initial product characterization and/or qualification.
Integrated Device Technology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.
IDT™ / ICS™ LVHSTL FREQUENCY SYNTHESIZER
1
ICS8422002AGI-01 REV. C NOVEMBER 1, 2007



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FEMTOCLOCKS™ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER
PRELIMINARY
Table 1. Pin Descriptions
Number
1, 7
2, 20
3, 4
5
6
8
9, 11
10, 16
12, 13
14
15
17
18, 19
Name
nc
VDDO
Q0, nQ0
MR
nPLL_SEL
VDDA
F_SEL0,
F_SEL1
VDD
XTAL_OUT,
XTAL_IN
REF_CLK
nXTAL_SEL
GND
nQ1, Q1
Type
Unused
Power
Output
Input Pulldown
Input Pulldown
Power
Description
No connect.
Output supply pins.
Differential output pair. LVHSTL interface levels.
Active HIGH Master Reset. When logic HIGH, the internal dividers are 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. When LOW,
selects PLL (PLL Enable). When HIGH, deselects the reference clock (PLL
Bypass). LVCMOS/LVTTL interface levels.
Analog supply pin.
Input Pulldown Frequency select pins. LVCMOS/LVTTL interface levels.
Power
Input
Input
Input
Power
Output
Pulldown
Pulldown
Core supply pins.
Parallel resonant crystal interface. XTAL_OUT is the output,
XTAL_IN is the input.
Single-ended reference clock input. LVCMOS/LVTTL interface levels.
Selects between crystal or REF_CLK inputs as the PLL Reference source.
Selects XTAL inputs when LOW. Selects REF_CLK when HIGH.
LVCMOS/LVTTL interface levels.
Power supply ground.
Differential output pair. LVHSTL interface levels.
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
Table 2. Pin Characteristics
Symbol
Parameter
CIN Input Capacitance
RPULLDOWN Input Pulldown Resistor
Test Conditions
Minimum
Typical
4
51
Maximum
Units
pF
k
IDT™ / ICS™ LVHSTL FREQUENCY SYNTHESIZER
2
ICS8422002AGI-01 REV. C NOVEMBER 1, 2007



Part Number ICS22002I-01
Description CRYSTAL-TOLVHSTL FREQUENCY SYNTHESIZER
Maker IDT - IDT
Total Page 15 Pages
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