MAX3785UWL+T Maxim Integrated, MAX3785UWL+T Datasheet

MAX3785UWL+T

Manufacturer Part Number

MAX3785UWL+T

Description

Communication ICs - Various 6.25Gbps 1.8V PC Board Equalizer

Manufacturer

Maxim Integrated

Type

Equalizerr

Datasheet

1.MAX3785ITT-T.pdf (8 pages)

Specifications of MAX3785UWL+T

Data Rate

6.4 Gbps

Supply Voltage - Max

1.89 V

Supply Voltage - Min

1.71 V

Supply Current

35 mA

Operating Supply Voltage

1.8 V

Supply Type

Analog

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The MAX3785 6.25Gbps equalizer operates from a sin-

gle 1.8V supply and compensates for transmission-

medium losses encountered with FR-4 transmission

lines. Optimized for low-voltage, high-density, DC-cou-

pled interconnections between the line card and switch

card, the MAX3785 enables a system upgrade path

while maintaining a legacy rate of 2.5Gbps to

3.125Gbps. Roughly the size of two 0603 passive com-

ponents, the MAX3785 easily provides placement and

routing flexibility.

The MAX3785 is composed of an equalizer, limiting

amplifier, and output driver. For data rates of 3.2Gbps

and lower, the MAX3785 equalizes signals for spans up

to 40in of FR-4 board material. For data rates up to

6.25Gbps, the MAX3785 compensates for 30in of FR-4

board material. The MAX3785 is coding independent,

functioning equally well for 8b/10b or scrambled signals.

The MAX3785 features DC-coupled current-mode logic

(CML) data inputs and outputs. It is packaged in a tiny

1.5mm × 1.5mm chip-scale package (UCSP™) and a

6-pin TDFN package.

19-2630; Rev 4; 10/08

UCSP is a trademark of Maxim Integrated Products, Inc.

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.

HSBI for ≤ 6.4Gbps

Double IEEE 802.3ae XAUI

Double STM-16/OC-48

________________________________________________________________ Maxim Integrated Products

General Description

MAC

6.25Gbps, 1.8V PC Board Equalizer

LINE CARD

OUT

Applications

MAX3785

1.8V

BACKPLANE

6.25Gbps

♦ Single 1.8V Supply

♦ Very Low Power, 60mW

♦ Spans 30in with FR-4 at 6.25Gbps

♦ Operates from 1.0Gbps to 6.4Gbps

♦ Coding Independent, 8b/10b or Scrambled

♦ DC-Coupled CML Inputs and Outputs

♦ Small 1.5mm × 1.5mm Footprint

+ Denotes a lead-free/RoHS-compliant package.

* EP = Exposed pad.

MAX3785UBL

MAX3785UWL+

MAX3785UTT

MAX3785UTT+

MAX3785ITT

MAX3785ITT+

TOP VIEW (BUMPS ON BOTTOM OF DIE)

PART

30in (0.75m)

IN+

IN-

MAX3785UBL

3 x 3 UCSP

Typical Application Circuit

MAX3785

GND

1.8V

OUT-

OUT+

SWITCH CARD

-20°C to +85°C

TEMP RANGE

0°C to +85°C

Ordering Information

OUT

Pin Configurations

OUT-

GND

IN-

ASIC WITH

SWITCH

SERDES

MAX3785UTT

TDFN

PIN-PACKAGE

6 UCSP (3

6 WLP

6 TDFN-EP*

Features

IN+

OUT+

Related parts for MAX3785UWL+T

MAX3785UWL+T Summary of contents

Page 1

... It is packaged in a tiny 1.5mm × 1.5mm chip-scale package (UCSP™) and a 6-pin TDFN package. HSBI for ≤ 6.4Gbps Double IEEE 802.3ae XAUI Double STM-16/OC-48 UCSP is a trademark of Maxim Integrated Products, Inc. LINE CARD MAC ...

Page 2

PC Board Equalizer ABSOLUTE MAXIMUM RATINGS Supply Voltage GND.................................-0.5V to +6.0V CC Continuous Output Current (OUT+, OUT-) .......-25mA to +25mA Input Voltage (IN+, IN-) ..............................-0. Operating Ambient Temperature Range (UBL, UTB)......................................................... 0°C to +85°C ...

Page 3

PC Board Equalizer PARAMETER Supply Voltage ( Operating Ambient Temperature (UBL, UTT) Supply Noise Tolerance Bit Rate Operating Ambient Temperature (ITT) SIGNAL SOURCE A <1.0pF SMA CONNECTOR Figure 1. Conditions of Testing (V = +1.8V, T ...

Page 4

PC Board Equalizer (V = +1.8V +25°C, unless otherwise noted. Measurements done at 6.25Gbps, 500mV PRBS (2 ), ninety-six 0s PRBS (2 using Tektronix’s FrameScan. Deterministic jitter of the ...

Page 5

PC Board Equalizer (V = +1.8V +25°C, unless otherwise noted. Measurements done at 6.25Gbps, 500mV PRBS (2 ), ninety-six 0s PRBS (2 using Tektronix’s FrameScan. Deterministic jitter of the ...

Page 6

PC Board Equalizer PIN NAME A1 IN- Negative Data Input, CML A2 GND Supply Ground A3 OUT- Negative Data Output, CML C1 IN+ Positive Data Input, CML C2 V Supply Voltage CC C3 OUT+ Positive Data Output, CML ...

Page 7

PC Board Equalizer IN+ IN- ESD STRUCTURES Figure 3. Equalizer Input DC Equivalent Circuit V CC 50Ω 50Ω Figure 4. CML Output Equivalent Circuit _______________________________________________________________________________________ V CC 50Ω 50Ω 37Ω 37Ω 28Ω 37Ω 37Ω OFFSET CORRECTION For the ...

Page 8

... 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. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products DESCRIPTION is a registered trademark of Maxim Integrated Products, Inc ...

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