MAX9489 Datasheet, PDF (1/11 Pages) Maxim Integrated Products – Multiple-Output Network Clock Generator

19-3385; Rev 0; 8/04
Multiple-Output Network Clock Generator
General Description
The MAX9489 clock generator provides multiple clock
outputs, ideal for network routers. The MAX9489 pro-
vides 15 buffered clock outputs, each independently
programmable to any of 10 individual frequencies:
133MHz, 125MHz, 100MHz, 83MHz, 80MHz, 66MHz,
62.5MHz, 50MHz, 33MHz, or 25MHz. All of the outputs
are single-ended LVCMOS. The MAX9489 is controlled
through its I²C™ interface.
At power-up, the frequency of output CLK1 is set by the
tri-level input SEL to 100MHz, 125MHz, or 133MHz,
while all other outputs are logic low. All outputs are then
programmable to any available frequency through the
I²C interface. Additionally, all output frequencies are
adjustable up or down, by a margin of 5% or 10%,
through the I²C interface.
The MAX9489 requires a 25MHz reference that can be
either a crystal or an external clock signal. The
MAX9489 requires a +3.0V to +3.6V power supply and
is available in a 32-pin thin QFN package with an
exposed pad for heat removal.
Applications
Network Routers
Telecom/Networking Equipment
Storage Area Networks/Network Attached
Storage
Pin Configuration
TOP VIEW
32 31 30 29 28 27 26 25
GND 1
SCL 2
SDA 3
SEL 4
AV_DD 5
X1 6
X2 7
AGND 8
MAX9489
EXPOSED PAD (GND)
24 V_DD
23 CLK12
22 CLK11
21 CLK10
20 V_DD
19 CLK9
18 CLK8
17 CLK7
9 10 11 12 13 14 15 16
THIN QFN-EP
I²C is a trademark of Philips Corp.
Purchase of I²C components of Maxim Integrated Products, Inc.,
or one of its sublicensed Associated Companies, conveys a
license under the Philips I²C Patent Rights to use these compo-
nents in an I²C system, provided that the system conforms to the
I²C Standard Specification as defined by Philips.
Features
♦ 15 LVCMOS Outputs with 10 Independently
Programmable Frequencies: 133MHz, 125MHz,
100MHz, 83MHz, 80MHz, 66MHz, 62.5MHz, 50MHz,
33MHz, and 25MHz
♦ 25MHz Crystal or Clock Input Reference
♦ Programmable Through I²C Interface
♦ Programmable Output Frequency Margin of ±5%
or ±10%
♦ Pin-Selectable Power-Up Frequency for CLK1
Output: 100MHz, 125MHz, or 133MHz
♦ Low Output Period Jitter: < 48ps_RMS
♦ Output-to-Output Skew < 200ps
♦ Available in 32-Lead, 5mm x 5mm x 0.8mm,
Thin QFN Package
♦ Operates from +3.0V to +3.6V Power Supply
♦ Power Dissipation 450mW (typ)
♦ Extended Temperature Range: -40°C to +85°C
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX9489ETJ
-40°C to +85°C
32 Thin QFN-EP*
5mm x 5mm x 0.8mm
*EP = Exposed pad.
Typical Operating Circuit
+3.3V
+3.3V
25MHz
0.1µF
AV_DD
V_DD
X1
10pF
10pF
X2
MAX9489 ^VDD
V_DD
V_DD
V_DD
SERIAL
INTERFACE
SDA
SCL
SA0
SA1
SEL
AGND
CLK1
CLK15
GND
0.1µF x 5
CLOCK
OUTPUTS
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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.