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MAX3980UTH+

P1-P3P4-P6P7-P9
Signal Detect with Standby Mode
Signal activity is detected on channel 1 only. When the
peak-to-peak differential voltage at IN1± is less than
30mVp-p, the TTL output SDET goes low. When the
peak-to-peak differential voltage becomes greater than
100mVp-p, SDET is asserted high. SDET can be used
to automatically force the equalizer into standby mode
by connecting SDET directly to the EN input. When not
used, SDET should not be connected.
The signal-detect function continues to operate while
the part is in standby mode. While connected to the EN
pin, the signal detect can “wake up” the part and
resume normal operation.
Layout Considerations
Circuit-board layout and design can significantly affect
the MAX3980 performance. Use good high-frequency
design techniques, including minimizing ground induc-
tances and vias and using controlled-impedance trans-
mission lines for the high-frequency data signals.
Signals should be routed differentially to reduce EMI
susceptibility and crosstalk. Power-supply decoupling
capacitors should be placed as close as possible to
the V
CC
pins.
MAX3980
3.125Gbps XAUI Quad Equalizer
_______________________________________________________________________________________ 7
V
CC
1.2kΩ
50Ω50Ω
200μA
IN+
IN-
ESD
STRUCTURES
Figure 2. CML Input Buffer
50Ω50Ω
V
CC
Q1 Q2
OUT+
OUT-
DATA
ESD
STRUCTURES
Figure 3. CML Output Buffer
MAX3980
3.125Gbps XAUI Quad Equalizer
8 _______________________________________________________________________________________
OUT2+
OUT2-
GND
OUT3+
GND
OUT4+
OUT4-
V
CC
OUT3-
V
CC
V
CC
IN1-
GND
V
CC
IN2+
IN2-
GND
V
CC
IN3+
IN3-
IN1+
V
CC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
GND
N.C.
N.C.
N.C.
N.C.
N.C.
IN4-
IN4+
V
CC
GND
EN
N.C.
N.C.
N.C.
N.C.
GND
OUT1+
OUT1-
V
CC
GND
SDET
MAX3980
N.C.
TOP VIEW
*NOTE: THE EXPOSED PAD MUST BE SOLDERED TO SUPPLY GROUND.
QFN-EP/TQFN-EP
*EP
Pin Configuration Package Information
For the latest package outline information and land patterns, go
to www.maxim-ic.com/packages
.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
44 QFN G4477-1
21-0092
44 TQFN T4477-3
21-0144
MAX3980
3.125Gbps XAUI Quad Equalizer
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 _____________________
9
© 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
Revision History
REVISION
NUMBER
REVISION
DATE
DESCRIPTION
PAGES
CHANGED
0 9/01 Initial release. —
Added the package code to the Ordering Information table. 1
1 5/03
Updated the 21-0092 package drawing in the Package Information section. 8, 9
Added the TQFN package to the Ordering Information table. 1
2 1/05
Added the 21-0144 package drawing to the Package Information section. 10
3 12/08
Changed the Absolute Maximum Ratings of SDET, IN_± from +5.0V to (V
CC
to
0.5V) to –5.0V to (V
CC
to 0.5V).
2
P1-P3P4-P6P7-P9

MAX3980UTH+

Mfr. #:
Buy MAX3980UTH+
Manufacturer:
Maxim Integrated
Description:
Equalizers 3.125Gbps XAUI Quad Equalizer
Lifecycle:
New from this manufacturer.
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