ICS8422002I-01 Datasheet, PDF (1/15 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO-LVHSTL FREQUENCY SYNTHESIZER

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}
HiPerClocks^TM 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 3^rd
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.
ICS8422002I-01
Features
• Two LVHSTL outputs (V_OHmax = 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
Block Diagram
F_SEL[1:0] ^Pulldown
2
nPLL_SEL ^Pulldown
REF_CLK ^Pulldown
1
25MHz
XTAL_IN
OSC
0
XTAL_OUT
nXTAL_SEL ^Pulldown
Phase
Detector
Pin Assignment
nc 1
VDDO 2
Q0 3
nQ0 4
MR 5
nPLL_SEL 6
nc 7
VDDA 8
F_SEL0 9
VDD 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
Q0
F_SEL[1:0]
0 0 ÷4
nQ0
1
0 1 ÷5
1 0 ÷10
VCO
1 1 Not Used
Q1
0
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