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ICS840004

Description
Hex inverters 14-SO 0 to 70
File Size272KB,14 Pages
ManufacturerICS ( IDT )
Websitehttp://www.icst.com
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ICS840004 Overview

Hex inverters 14-SO 0 to 70

PRELIMINARY
Integrated
Circuit
Systems, Inc.
ICS840004
F
EMTO
C
LOCKS
™ C
RYSTAL
-
TO
-
LVCMOS/LVTTL F
REQUENCY
S
YNTHESIZER
F
EATURES
• Four LVCMOS/LVTTL outputs, 15Ω typical output impedance
• Selectable crystal oscillator interface
or LVCMOS single-ended input
• Supports the following input frequencies: 212.5MHz,
159.375MHz, 156.25MHz, 106.25MHz and 53.125MHz
• VCO range: 470MHz - 750MHz
• RMS phase jitter @ 212.5MHz (637kHz - 10MHz):
0.98ps typical, V
DDO
= 3.3V
Phase noise:
Offset
Noise Power
100Hz ............... -88.8 dBc/Hz
1kHz ............. -109.0 dBc/Hz
10kHz ............. -116.1 dBc/Hz
100kkHz ............. -117.5 dBc/Hz
• Full 3.3V or 3.3V core/2.5V output supply mode
• 0°C to 70°C ambient operating temperature
• Available in both standard and lead-free RoHS compliant
packages
G
ENERAL
D
ESCRIPTION
The ICS840004 is a 4 output LVCMOS/LVTTL
Synthesizer optimized to generate Ethernet
HiPerClockS™
reference clock frequencies and is a member
of the HiPerClocks
TM
family of high perfor-
mance clock solutions from ICS. Using a
26.5625MHz, 18pF parallel resonant crystal, the following
frequencies can be generated based on the 2 frequency
select pins (F_SEL1:0): 212.5MHz, 159.375MHz,
156.25MHz, 106.25MHz, and 53.125MHz. The ICS840004
uses ICS’ 3
rd
generation low phase noise VCO technology
and can achieve 1ps or lower typical random rms phase
jitter, easily meeting Ethernet jitter requirements. The
ICS840004 is packaged in a small 20-pin TSSOP package.
IC
S
F
REQUENCY
S
ELECT
F
UNCTION
T
ABLE
Input
Frequency
26.5625
26.5625
26.5625
26.5625
26.04166
Inputs
M Divider
F_SEL1 F_SEL0
Value
0
0
24
0
1
1
0
1
0
1
1
24
24
24
24
N Divider
Value
3
4
6
12
4
M/N
Ratio Value
8
6
4
2
6
Output
Frequency
Range
212.5
159.375
106.25
53.125
156.25
B
LOCK
D
IAGRAM
OE
Pullup
F_SEL1:0 Pullup:Pullup
nPLL_SEL Pulldown
nXTAL_SEL
Pulldown
P
IN
A
SSIGNMENT
2
F_SEL0
nc
nXTAL_SEL
TEST_CLK
OE
MR
nPLL_SEL
V
DDA
nc
V
DD
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
F_SEL1
GND
Q0
Q1
V
DDO
Q2
Q3
GND
XTAL_IN
XTAL_OUT
XTAL_IN 26.5625MHz
OSC
XTAL_OUT
TEST_CLK Pulldown
0
F_SEL1:0
1
Phase
Detector
00
01
10
11
Q0
1
VCO
0
N
÷3
÷4
÷6
÷12
(default)
Q1
ICS840004
20-Lead TSSOP
6.5mm x 4.4mm x 0.92mm
package body
Q2
M = ÷24 (fixed)
Q3
G Package
Top View
MR
Pulldown
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial
product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.
840004AG
www.icst.com/products/hiperclocks.html
REV. B DECEMBER 23, 2005
1

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