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840021AGLFT

Description
IC CLOCK GENERATOR 8-TSSOP
Categorysemiconductor    Analog mixed-signal IC   
File Size743KB,14 Pages
ManufacturerIDT (Integrated Device Technology, Inc.)
Websitehttp://www.idt.com/
Environmental Compliance
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840021AGLFT Overview

IC CLOCK GENERATOR 8-TSSOP

840021AGLFT Parametric

Parameter NameAttribute value
typeClock/frequency synthesizer, clock generator
PLLyes
entercrystal
outputLVCMOS,LVTTL
Number of circuits1
Ratio - Input:Output1:1
Differential - Input:OutputNone/None
Frequency - maximum125MHz
Frequency divider/multiplieryes/no
Voltage - Power2.375 V ~ 3.465 V
Operating temperature0°C ~ 70°C
Installation typesurface mount
Package/casing8-TSSOP (0.173", 4.40mm wide)
Supplier device packaging8-TSSOP
FEMTOCLOCK™ CRYSTAL-TO-LVCMOS/LVTTL
CLOCK GENERATOR
ICS840021
General Description
The ICS840021 is a Gigabit Ethernet Clock
Generator and a member of the HiPerClocks
TM
HiPerClockS™
family of high performance devices from IDT. The
ICS840021 uses a 25MHz crystal to synthesize
125MHz. The ICS840021 has excellent phase jitter
performance, over the 1.875MHz – 20MHz integration range. The
ICS840021 is packaged in a small 8-pin TSSOP, making it ideal for
use in systems with limited board space.
Features
One LVCMOS/LVTTL output, 7Ω output impedance
Crystal oscillator interface designed for 25MHz,
18pF parallel resonant crystal
Output frequency: 125MHz
VCO range: 560MHz to 680MHz
RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.34ps (typical) 3.3V
RMS phase noise at 125MHz (typical)
Phase noise:
Offset
Noise Power
100Hz ................-96.9 dBc/Hz
1kHz ..............-122.2 dBc/Hz
10kHz ..............-131.1 dBc/Hz
100Hz ..............-129.5 dBc/Hz
ICS
3.3V operating supply
0°C to 70°C ambient operating temperature
Available in both standard (RoHS 5) and lead-free (RoHS 6)
packages
Block Diagram
OE
Pullup
25MHz
Pin Assignment
V
DDA
OE
XTAL_OUT
XTAL_IN
1
2
3
4
8
7
6
5
V
DD
Q0
GND
RESERVED
XTAL_IN
XTAL_OUT
OSC
Phase
Detector
VCO
÷5
Q0
ICS840021
÷25
(fixed)
8-Lead TSSOP
4.40mm x 3.0mm x 0.925mm package body
G Package
Top View
IDT™ / ICS™
LVCMOS CLOCK GENERATOR
1
ICS840021AG REV. B APRIL 28, 2009

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