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ICS840002I-01

CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER


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ICS840002I-01 pdf
www.IDT.com
ICS840002I-01
FEMTOCLOCKS™ CRYSTAL-TO-
LVCMOS/LVTTL FREQUENCY SYNTHESIZER
GENERAL DESCRIPTION
The ICS840002I-01 is a 2 output LVCMOS/LVTTL
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_SEL1:0):
156.25MHz, 125MHz, and 62.5MHz. The ICS840002I-01 uses
IDT’s 3rd generation low phase noise VCO technology and
can achieve 1ps or lower typical random rms phase jitter,
easily meeting Ethernet jitter requirements. The ICS840002I-
01 is packaged in a small 16-pin TSSOP package.
FREQUENCY SELECT FUNCTION TABLE
FEATURES
• Two LVCMOS/LVTTL outputs @ 3.3V,
17Ω typical output impedance
• Selectable crystal oscillator interface
or LVCMOS single-ended input
• Supports the following output frequencies:
156.25MHz, 125MHz and 62.5MHz
• Output frequency range: 56MHz - 175MHz
• VCO range: 560MHz - 700MHz
• Output skew: 12ps (maximum)
• RMS phase jitter at 156.25MHz (1.875MHz - 20MHz):
0.47ps (typical)
Offset
Noise Power
100Hz ............... -97.4 dBc/Hz
1kHz ............. -120.2 dBc/Hz
10kHz ............. -127.6 dBc/Hz
100kHz ............. -126.1 dBc/Hz
• Power supply modes:
Core/Output
3.3V/3.3V
3.3V/2.5V
2.5V/2.5V
• -40°C to 85°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free RoHS
(6) packages
F_SEL1
0
F_SEL0
0
Inputs
M Divider Value
25
N Divider Value
4
Output Frequency
(25MHz Ref.)
156.25
01
25
5
125
10
25
10
62.5
11
25
5
125
BLOCK DIAGRAM
OE Pullup
F_SEL1:0 Pullup:Pullup
nPLL_SEL Pulldown
nXTAL_SEL Pulldown
XTAL_IN 25MHz
OSC 0
XTAL_OUT
TEST_CLK Pulldown
1
2
Phase
Detector
VCO
F_SEL1:0
1N
0 0 ÷4
0 1 ÷5
0 1 0 ÷10
1 1 ÷5
M = ÷25 (fixed)
PIN ASSIGNMENT
F_SEL0 1 16 F_SEL1
nXTAL_SEL 2 15 GND
TEST_CLK 3 14 GND
OE 4 13 Q0
MR 5 12 Q1
nPLL_SEL 6
1 1 VDDO
VDDA 7
10 XTAL_IN
VDD 8
9 XTAL_OUT
Q0 ICS840002I-01
16-Lead TSSOP
Q1 4.4mm x 5.0mm x 0.92mm
package body
G Package
Top View
MR Pulldown
840002AGI-01
1
REV. A OCTOBER 22, 2007



No Preview Available !

ICS840002I-01 pdf
www.IDT.com
ICS840002I-01
FEMTOCLOCKS™CRYSTAL-TO-
LVCMOS/LVTTL FREQUENCY SYNTHESIZER
TABLE 1. PIN DESCRIPTIONS
Number
1, 16
Name
F_SEL0,
F_SEL1
2 nXTAL_SEL
Type
Description
Input Pullup Frequency select pin. LVCMOS/LVTTL interface levels.
Input
Selects between the crystal or TEST_CLK inputs as the PLL reference
Pulldown source. When HIGH, selects TEST_CLK. When LOW, selects XTAL
inpus. LVCMOS/LVTTL interface levels.
3
TEST_CLK
Input Pulldown Single-ended LVCMOS/LVTTL clock input.
4
OE
Input
Pullup
Output enable pin. When HIGH, the outputs are active. When LOW, the
outputs are in a high impedance state. LVCMOS/LVTTL interface levels.
Active HIGH Master Reset. When logic HIGH, the internal dividers are
5 MR Input Pulldown reset causing active outputs to go low. When logic LOW, the internal
dividers and the outputs are enabled. LVCMOS/LVTTL interface levels.
PLL Bypass. When LOW, the output is driven from the VCO output.
6
nPLL_SEL
Input
Pulldown
When HIGH, the PLL is bypassed and the output frequency =
reference clock frequency/N output divider.
LVCMOS/LVTTL interface levels.
7
VDDA
Power
8 VDD Power
9,
10
XTAL_OUT,
XTAL_IN
Input
Analog supply pin.
Core supply pin.
Crystal oscillator interface.
11
12, 13
VDDO
Q1, Q0
Power
Output
Output supply pin.
Single-ended clock outputs. LVCMOS/LVTTL interface levels.
14, 15
GND
Power
Power supply ground.
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
CIN
CPD
RPULLUP
RPULLDOWN
Parameter
Input Capacitance
Power Dissipation Capacitance
Input Pullup Resistor
Input Pulldown Resistor
ROUT
Output Impedance
Test Conditions
3.3V±5%
2.5V±5%
Minimum
14
16
Typical
4
8
51
51
17
21
Maximum
21
25
Units
pF
pF
kΩ
kΩ
Ω
Ω
840002AGI-01
www.icst.com/products/hiperclocks.html
2
REV. A OCTOBER 18, 2007



Part Number ICS840002I-01
Description CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER
Maker IDT - IDT
Total Page 13 Pages
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