ICS843021I-01 Datasheet, PDF (1/15 Pages) Integrated Circuit Systems – FEMTOCLOCKS-TM CRYSTAL-TO-3.3V, 2.5V 125MHZ LVPECL CLOCK GENERATOR

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 HiPerClocks^TM
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