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ICS843021I-01

FEMTOCLOCKS CRYSTAL-TO-3.3V 2.5V LVPECL CLOCK GENERATOR


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FEMTOCLOCKS™ CRYSTAL-TO-
3.3V, 2.5V LVPECL CLOCK GENERATOR
General Description
The ICS843021I-01 is a Gigabit Ethernet Clock
ICS Generator and a member of the HiPerClocksTM
HiPerClockS™ family of high performance devices from IDT. The
ICS843021I-01 uses a 25MHz crystal to synthesize
125MHz. The ICS843021I-01 has excellent phase
jitter performance, over the 1.875MHz – 20MHz integration range.
The ICS843021I-01 is packaged in a small 8-pin TSSOP, making it
ideal for use in systems with limited board space.
ICS843021I-01
Features
One differential 3.3V or 2.5V LVPECL output
Crystal oscillator interface designed for 25MHz,
18pF parallel resonant crystal
Output frequency range: 125MHz, using a 25MHz crystal
VCO range: 490MHz – 640MHz
RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz – 20MHz): 0.41ps (typical)
Full 3.3V or 2.5V operating supply
-40°C to 85°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
Block Diagram
OE Pullup
25MHz
XTAL_IN
OSC
XTAL_OUT
Phase
Detector
VCO
÷20
(fixed)
÷4
(fixed)
Pin Assignment
VCC 1
8Q
XTAL_OUT 2
7 nQ
XTAL_IN 3
6 VCC
Q
VEE 4
5 OE
nQ
ICS843021I-01
8 Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
IDT™ / ICS™ 3.3V , 2.5V LVPECL CLOCK GENERATOR
1
ICS843021AGI-01 REV. A DECEMBER 3, 2007



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ICS843021I-01 pdf
ICS843021I-01
FEMTOCLOCKS™CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR
www.DataSheet4U.com
Table 1. Pin Descriptions
Number
1, 8
2,
3
4
5
7, 8
Name
VCC
XTAL_OUT
XTAL_IN
VEE
OE
nQ, Q
Type
Power
Input
Power
Input
Pullup
Output
Description
Power supply pins.
Crystal oscillator interface. XTAL_IN is the input, XTAL_OUT is the output.
Negative supply pin.
Active high output enable. When logic HIGH, the outputs are enabled and
active. When logic LOW, the outputs are disabled and are in a high impedance
state. LVCMOS/LVTTL interface levels.
Differential output pair. LVPECL interface levels.
NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
Table 2. Pin Characteristics
Symbol
CIN
RPULLUP
Parameter
Input Capacitance
Input Pullup Resistor
Test Conditions
Minimum
Typical
4
51
Maximum
Units
pF
k
IDT™ / ICS™ 3.3V , 2.5V LVPECL CLOCK GENERATOR
2
ICS843021AGI-01 REV. A DECEMBER 3, 2007



Part Number ICS843021I-01
Description FEMTOCLOCKS CRYSTAL-TO-3.3V 2.5V LVPECL CLOCK GENERATOR
Maker Integrated Device Technology - Integrated Device Technology
Total Page 15 Pages
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