PRELIMINARY
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V
LVPECL 400MHZ FREQUENCY SYNTHESIZER
ICS843801I-24
GENERAL DESCRIPTION
FEATURES
• One differential LVPECL output
The ICS843801I-24 is a 400MHz Frequency
ICS
Synthesizer and a member of the HiPerClocksTM
family of high performance devices from IDT. The
ICS843801I-24 uses an 18pF parallel resonant
HiPerClockS™
• Crystal oscillator interface, 18pF parallel resonant crystal
(21.5625MHz - 25.3125MHz)
crystal over the range of 21.5625MHz
-
• Output frequency range: 172.5MHz - 202.5MHz, and
345MHz - 405MHz
25.3125MHz. The ICS843801I-24 has excellent <1ps phase
jitter performance, over the 12kHz - 20MHz integration range.
The ICS843801I-24 is packaged in a small 8-pin TSSOP,
making it ideal for use in systems with limited board space.
• VCO range: 690MHz - 810MHz
• RMS phase jitter @ 400MHz, using a 25MHz crystal
(12kHz - 20MHz): 0.62ps (typical) @ 3.3V
• 3.3V or 2.5V operating supply
• -40°C to 85°C ambient operating temperature
• Available in both standard (RoHS5) and lead-free (RoHS 6)
packages
COMMON CONFIGURATION TABLE
Inputs
Output Frequency
Multiplication
Value M/N
(MHz)
Crystal Frequency (MHz) FREQ_SEL
M
N
25
25
0
1
32
32
2
4
16
8
400
200
BLOCK DIAGRAM
PIN ASSIGNMENT
Pullup
FREQ_SEL
VCCA
XTAL_OUT
XTAL_IN
VEE
VCC
1
2
3
4
8
7
6
5
Q
nQ
FREQ_SEL
N
÷2
÷4
XTAL_IN
OSC
XTAL_OUT
Q
VCO
Phase
Detector
FREQ_SEL
0
1
690MHz - 810MHz
nQ
ICS843801I-24
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
M = ÷32 (fixed)
G Package
Top View
The Preliminary Information presented herein represents a product in pre-production.The noted characteristics are based on initial product characterization
and/or qualification.Integrated DeviceTechnology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice.
IDT™ / ICS™ 400MHZ, LVPECLFREQUENCY SYNTHESIZER
1
ICS843801AGI-24 REV A JANUARY 15, 2008