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PDF MAX9492 Data sheet ( Hoja de datos )
| Número de pieza | MAX9492 | |
| Descripción | Multiple-Output Clock Generator with Spread Spectrum | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3683; Rev 0; 5/05
www.DataSheet4U.com
Multiple-Output Clock Generator
with Spread Spectrum
General Description
The MAX9492 frequency synthesizer is designed to
generate multiple clocks for clock distribution in net-
work routers or switches. The device provides a total of
six buffered clock outputs (CLK1 to CLK6). CLK1 is the
buffered output of the reference clock. CLK2 through
CLK6 are independently programmable to generate
eight different frequencies based on a 25MHz input
crystal: 133, 125, 83, 66, 62.5, 50, 33, and 25MHz. All
the outputs are LVCMOS single-ended signals. Either a
25MHz crystal or an external clock can serve as the
input reference clock. The MAX9492 incorporates two
phase-locked loops (PLLs) with two internal loop filters.
Select the MAX9492’s output clock frequency by pro-
gramming on-chip registers through the MAX9492’s
I2C* interface. The device also features spread-spec-
trum capability to reduce electromagnetic interference
(EMI). This technique allows spreading the fundamental
energy over a wider frequency range, hence reducing
the respective energy amplitude. The output frequency
spectrum is downspread by -1.25% or -2.5%.
The MAX9492 operates from a 3.3V supply and is guar-
anteed over the extended temperature range (-40°C to
+85°C). The device is available in a space-saving,
20-pin, TQFN, 5mm x 5mm package.
Features
o Five LVCMOS Outputs with Independent
Frequency Selections
o One Buffered Reference Clock Output
o Eight Selectable Frequencies: 133, 125, 83, 66,
62.5, 50, 33, and 25MHz
o Crystal or an Input-Clock-Based Clock Reference
o Output Frequency Programmed Through I2C
Interface
o 0, -1.25%, or -2.5% Selectable Downspreading
Rate
o Low Output Period Jitter
(Without Spread Spectrum) < 10psRMS
o <220ps Output-to-Output Skew
o Available in 20-Lead, 5mm x 5mm, TQFN Package
o +3.3V Supply
o -40°C to +85°C Extended Temperature Range
Applications
Network Routers
Telecom/Networking Equipment
Storage Area Networks/Network Attached
Storage
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
20 Thin QFN-EP**
MAX9492ETP -40°C to +85°C 5mm x 5mm x
0.8mm
**EP = Exposed pad.
T2055-3
Typical Operating Circuit and Pin Configuration appear at
end of data sheet.
*Purchase of I2C components from Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a
license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C
Standard Specification as defined by Philips.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
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Multiple-Output Clock Generator
with Spread Spectrum
(TA = +25°C, unless otherwise noted.)
PERIOD JITTER vs. TEMPERATURE
20
16
133MHz
33.3MHz
12
8 125MHz 62.5MHz
4
0
-40
-15 10 35 60
TEMPERATURE (°C)
85
Typical Operating Characteristics (continued)
133MHz OUTPUT WAVEFORM
MAX9492 toc05
3.3V
83MHz OUTPUT WAVEFORM
MAX9492 toc06
3.3V
0V
2ns/div
0V
2ns/div
DUTY CYCLE vs. TEMPERATURE
51.0
50.5
33.3MHz
50.0 62.5MHz
49.5
49.0
48.5 133MHz
125MHz
48.0
47.5
47.0
-40
-15 10 35 60
TEMPERATURE (°C)
85
PERIOD JITTER vs. FREQUENCY
20
16
12
8
4
0
25 50 75 100 125 150
FREQUENCY (MHz)
133MHz OUTPUT 0% DOWNSPREADING
MAX9492 toc09
10dB/REF 0dBm
RBW = 10kHz
VBW = 10kHz
ATN = 20dB
CENTER = 133MHz
SPAN = 4MHz
133MHz OUTPUT WITH
0% AND 1.25% DOWNSPREADING
MAX9492 toc10
133MHz OUTPUT WITH
0% AND 2.5% DOWNSPREADING
MAX9492 toc11
10dB/REF 0dBm
VBW = 1kHz
CENTER = 133MHz
RBW = 100kHz
ATN = 20dB
SPAN = 15MHz
10dB/REF 0dBm RBW = 100kHz
VBW = 1kHz
ATN = 20dB
CENTER = 133MHz SPAN = 15MHz
_______________________________________________________________________________________ 5
5 Page 
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Multiple-Output Clock Generator
with Spread Spectrum
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
MARKING
D
D/2
XXXXX
E/2
E
D2
CL b 0.10 M C A B
D2/2
k
L
(NE-1) X e
E2/2
CL E2
PIN # 1
I.D.
C
-DRAWING NOT TO SCALE-
e
L1 L
0.10 C
A
0.08 C
A1 A3
DETAIL A
e/2
e
(ND-1) X e
PIN # 1 I.D.
0.35x45¡
DETAIL B
CL
L
e
CL
e
L
PACKAGE OUTLINE,
16, 20, 28, 32, 40L THIN QFN, 5x5x0.8mm
21-0140
1
H2
COMMON DIMENSIONS
PKG.
16L 5x5
20L 5x5
28L 5x5
32L 5x5
40L 5x5
SYMBOL MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX.
A 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80
A1 0 0.02 0.05 0 0.02 0.05 0 0.02 0.05 0 0.02 0.05 0 0.02 0.05
A3
0.20 REF.
0.20 REF.
0.20 REF.
0.20 REF.
0.20 REF.
b 0.25 0.30 0.35 0.25 0.30 0.35 0.20 0.25 0.30 0.20 0.25 0.30 0.15 0.20 0.25
D 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10
E 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10
e
0.80 BSC.
0.65 BSC.
0.50 BSC.
0.50 BSC.
0.40 BSC.
k 0.25 - - 0.25 - - 0.25 - - 0.25 - - 0.25 0.35 0.45
L 0.30 0.40 0.50 0.45 0.55 0.65 0.45 0.55 0.65 0.30 0.40 0.50 0.40 0.50 0.60
L1 - - - - - - - - - - - - 0.30 0.40 0.50
N 16 20 28 32 40
ND 4 5 7 8 10
NE 4 5 7 8 10
JEDEC
WHHB
WHHC
WHHD-1
WHHD-2
-----
NOTES:
1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994.
2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES.
3. N IS THE TOTAL NUMBER OF TERMINALS.
4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL
CONFORM TO JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE
OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE TERMINAL #1
IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE.
5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN
0.25 mm AND 0.30 mm FROM TERMINAL TIP.
6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY.
7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION.
8. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS.
9. DRAWING CONFORMS TO JEDEC MO220, EXCEPT EXPOSED PAD DIMENSION FOR T2855-1,
T2855-3, AND T2855-6.
10. WARPAGE SHALL NOT EXCEED 0.10 mm.
11. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY.
12. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY.
13. LEAD CENTERLINES TO BE AT TRUE POSITION AS DEFINED BY BASIC DIMENSION "e", –0.05.
-DRAWING NOT TO SCALE-
PKG.
CODES
T1655-1
T1655-2
T1655N-1
T2055-2
T2055-3
T2055-4
T2055-5
T2855-1
T2855-2
T2855-3
T2855-4
T2855-5
T2855-6
T2855-7
T2855-8
T2855N-1
T3255-2
T3255-3
T3255-4
T3255N-1
T4055-1
EXPOSED PAD VARIATIONS
D2
MIN. NOM. MAX. MIN.
3.00 3.10 3.20 3.00
3.00 3.10 3.20 3.00
3.00 3.10 3.20 3.00
3.00 3.10 3.20 3.00
E2
NOM. MAX.
3.10 3.20
3.10 3.20
3.10 3.20
3.10 3.20
L
–0.15
**
**
**
**
DOWN
BONDS
ALLOWED
NO
YES
NO
NO
3.00
3.00
3.15
3.10 3.20 3.00
3.10 3.20 3.00
3.25 3.35 3.15
3.10
3.10
3.25
3.20
3.20
3.35
**
**
0.40
YES
NO
YES
3.15
2.60
3.15
2.60
2.60
3.15
2.60
3.15
3.15
3.00
3.00
3.00
3.00
3.20
3.25 3.35 3.15
2.70 2.80 2.60
3.25 3.35 3.15
2.70 2.80 2.60
2.70 2.80 2.60
3.25 3.35 3.15
2.70 2.80 2.60
3.25 3.35 3.15
3.25 3.35 3.15
3.10 3.20 3.00
3.10 3.20 3.00
3.10 3.20 3.00
3.10 3.20 3.00
3.30 3.40 3.20
3.25
2.70
3.25
2.70
2.70
3.25
2.70
3.25
3.25
3.10
3.10
3.10
3.10
3.30
3.35
2.80
3.35
2.80
2.80
3.35
2.80
3.35
3.35
3.20
3.20
3.20
3.20
3.40
**
**
**
**
**
**
**
0.40
**
**
**
**
**
**
NO
NO
YES
YES
NO
NO
YES
YES
NO
NO
YES
NO
NO
YES
** SEE COMMON DIMENSIONS TABLE
PACKAGE OUTLINE,
16, 20, 28, 32, 40L THIN QFN, 5x5x0.8mm
21-0140
H
2
2
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet MAX9492.PDF ] | |
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