MAX3981UTH+ Maxim Integrated Products, MAX3981UTH+ Datasheet

IC XAUI QUAD EQUAL 44-TQFN

MAX3981UTH+

Manufacturer Part Number
MAX3981UTH+
Description
IC XAUI QUAD EQUAL 44-TQFN
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX3981UTH+

Applications
*
Interface
*
Voltage - Supply
*
Package / Case
44-TQFN Exposed Pad
Mounting Type
Surface Mount
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX3981 quad equalizer provides compensation
for transmission medium losses for four “lanes” of digi-
tal NRZ data at a data rate of 3.125Gbps in one
package. It is tailor-made for 10Gigabit Ethernet appli-
cations that require attenuation of noise and jitter that
occur in communicating with chassis-to-chassis inter-
connect. In support of IEEE-802.3ae for the XAUI inter-
face, the MAX3981 adaptively allows XAUI lanes to
reach 10m (33ft) with inexpensive twin-axial cable for
extended backplane applications.
The equalizer has 100Ω differential CML data inputs
and outputs.
The MAX3981 is available in a 44-pin exposed-pad
QFN package. The MAX3981 consumes only 700mW at
3.3V or 175mW per channel.
19-2178; Rev 2; 12/08
InfiniBand is a trademark and service mark of the InfiniBand Trade Association.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
10GbE
IEEE–802.3ae XAUI Interface (3.125Gbps)
InfiniBand
Rx
Tx
PMD
Rx
Tx
SM
________________________________________________________________ Maxim Integrated Products
(2.5Gbps)
4
4
3.125Gbps XAUI Quad Cable Equalizer
General Description
LINE CARD
Rx
Tx
MAC
Rx
Tx
Applications
4
4 x 3.125Gbps
OUT
MAX3981
SUPPLY
3.3V
4
IN
♦ Four Differential Digital Data “Lanes” at
♦ Span 10m (33ft) of Twin-Axial Cable
♦ Receiver Equalization Reduces Intersymbol
♦ Low Power, 175mW per Channel
♦ Standby Mode—Power-Down State
♦ Single 3.3V Supply
♦ Signal Detect
* EP = Exposed pad.
Pin Configuration appears at end of data sheet.
MAX3981UGH
3.125Gbps
Interference (ISI)
TWIN-AX CABLE
10m (33ft)100Ω
PART
Typical Operating Circuit
IN
TEMP RANGE
0°C to +85°C
Ordering Information
MAX3981
SUPPLY
3.3V
SWITCH CARD
4
OUT
4
PIN-PACKAGE
Features
44 QFN-EP*
Rx
Tx
SWITCH
1

Related parts for MAX3981UTH+

MAX3981UTH+ Summary of contents

Page 1

... InfiniBand is a trademark and service mark of the InfiniBand Trade Association. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. ♦ Four Differential Digital Data “Lanes” at 3.125Gbps ♦ Span 10m (33ft) of Twin-Axial Cable ♦ ...

Page 2

XAUI Quad Cable Equalizer ABSOLUTE MAXIMUM RATINGS Supply Voltage, V ..............................................-0.5V to +4.0V CC Voltage at SDET .........................................-0. Voltage at IN_±...........................................-0. Current Out of OUT_±.......................................-25mA to +25mA Stresses beyond those listed under “Absolute Maximum Ratings” ...

Page 3

XAUI Quad Cable Equalizer ELECTRICAL CHARACTERISTICS (continued +3.0V to +3.6V, input data rate = 3.125Gbps otherwise noted.) PARAMETER SYMBOL TTL CONTROL PINS Input High Voltage Input Low Voltage Input High Current Input Low Current Output ...

Page 4

XAUI Quad Cable Equalizer (V = +3.3V, 3.125Gbps, 500mVp-p cable input with 2 CC used was Tensolite, Z-Skew, 100Ω, 28AWG. Shielded twisted pair used was Madison 100Ω, 30AWG, spec #14887.) EQUALIZER INPUT EYE DIAGRAM AFTER 10m (33ft) OF TWIN-AXIAL ...

Page 5

XAUI Quad Cable Equalizer PIN NAME 13, V +3.3V Supply Voltage CC 23, 27, 31 12, 16, GND Supply Ground 26, 30, 34 IN1+ Positive Equalizer Input Channel 1, CML 3 ...

Page 6

XAUI Quad Cable Equalizer Detailed Description Receiver and Transmitter The adaptive equalizer accepts four lanes of 3.125Gbps CML digital data signals and compensates each received signal for dielectric and skin losses. A limiting amp shapes the output of the ...

Page 7

XAUI Quad Cable Equalizer V CC 1.2kΩ 50Ω IN+ IN- 200μA ESD STRUCTURES Figure 2. CML Input Buffer tion of the signal detect (SDET) function. For constant operation, connect the EN signal directly to V Signal Detect with Standby ...

Page 8

XAUI Quad Cable Equalizer Pin Configuration TOP VIEW IN1+ 2 IN1- 3 GND IN2+ 6 MAX3981 IN2- 7 GND IN3+ 10 *EP IN3- 11 QFN-EP *NOTE: EXPOSED PAD ...

Page 9

... 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 DESCRIPTION to 0 ...

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