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ICS840N021I-01 Datasheet

Clock Synthesizer

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FemtoClock® NG Crystal-to-LVCMOS/LVTTL ICS840N021I-01
Clock Synthesizer
DATA SHEET
General Description
The ICS840N021I-01 is a LVCMOS/LVTTL clock synthesizer
designed for Ethernet applications. The device generates a 125MHz
clock signal from a 25MHz crystal with excellent phase jitter
performance. The device uses IDT’s fourth generation FemtoClock®
NG technology for an optimum of high clock frequency, low phase
noise performance and low power consumption.The device supports
2.5V or 3.3V voltage supply and is packaged in a small, lead-free
(RoHS 6) 8-lead TSSOP package. The extended temperature range
supports wireless infrastructure, telecommunication and networking
end equipment requirements.
Frequency Table
fXTAL (MHz)
25
30.72
Output Frequency (MHz)
125
153.6
Features
Fourth generation FemtoClock® NG technology
125MHz output clock synthesized from a 25MHz fundamental
mode crystal
One 2.5V or 3.3V LVCMOS/LVTTL clock output
Crystal interface designed for 25MHz,
12pF parallel resonant crystal
RMS phase jitter @ 125MHz, using a 25MHz crystal
(1.875MHz - 20MHz): 0.151ps (maximum)
RMS phase jitter @ 125MHz, using a 25MHz crystal
(12kHz - 20MHz): 0.478ps (maximum)
LVCMOS/LVTTL interface level for the output enable input
Full 2.5V or 3.3V supply voltage
Available in lead-free (RoHS 6) package
-40°C to 85°C ambient operating temperature
Function Table
Input
OE
Output Enable
0
Output Q is disabled in high-impedance state
1 (default)
Output Q is enabled.
NOTE: OE is an asynchronous control.
Block Diagram
XTAL_IN
PFD
FemtoClock® NG
OSC
&
VCO
÷4
Q
XTAL_OUT
LPF
490-637.5MHz
÷20
OE
Pullup
Pin Assignment
VDDA 1
OE 2
XTAL_OUT 3
XTAL_IN 4
8 VDD
7Q
6 GND
5 DNU
ICS840N021I-01
8-lead TSSOP
4.40mm x 3.0mm x 0.925mm
package body
G Package
Top View
ICS840N021BGI-01 REVISION A MAY 25, 2012
1
©2012 Integrated Device Technology, Inc.


Renesas Electronics Components Datasheet

ICS840N021I-01 Datasheet

Clock Synthesizer

No Preview Available !

ICS840N021I-01 Data Sheet
FEMTOCLOCK® NG CRYSTAL-TO-LVCMOS/LVTTL CLOCK SYNTHESIZER
Table 1. Pin Descriptions
Number
Name
Type
Description
1
VDDA
Power
Analog power supply.
2
OE
Input
Pullup Output enable pin. LVCMOS interface levels.
3,
4
XTAL_OUT,
XTAL_IN
Input
Crystal oscillator interface. XTAL_IN is the input, XTAL_OUT is the output.
5
DNU
Do not use.
6
GND
Power
Power supply ground.
7
Q
Output
Single-ended clock output. LVCMOS/LVTTL interface levels.
8
VDD
Power
Core supply pin.
NOTE: Pullup refers to an internal input resistor. See Table 2, Pin Characteristics, for typical values.
Table 2. Pin Characteristics
Symbol
CIN
CPD
Parameter
Input Capacitance
Power Dissipation
Capacitance
RPULLUP Input Pullup Resistor
ROUT
Output Impedance
Test Conditions
VDD = 3.465V
VDD = 2.625V
VDD = 3.3V
VDD = 2.5V
Minimum
Typical
3.5
11
9
51
15
19
Maximum
Units
pF
pF
pF
k
ICS840N021BGI-01 REVISION A MAY 25, 2012
2
©2012 Integrated Device Technology, Inc.



Part Number ICS840N021I-01
Description Clock Synthesizer
Maker Renesas
Total Page 3 Pages
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