MAXIM MAX3885 User Manual

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.

General Description

The MAX3885 deserializer is ideal for converting

2.488Gbps serial data to 16-bit wide, 155Mbps parallel
data in SDH/SONET applications. Operating from a sin­gle +3.3V supply, this device accepts PECL serial
clock and data inputs, and delivers low-voltage differ­ential-signal (LVDS) clock and data outputs for interfac­ing with high-speed digital circuitry. It also provides an
LVDS synchronization input that enables data realign­ment and reframing. The MAX3885 is available in the
extended temperature range (-40°C to +85°C) in a 64­pin TQFP package.

Applications

2.488Gbps SDH/SONET Transmission Systems

Add/Drop Multiplexers

Digital Cross Connects

Features

♦♦

Single +3.3V Supply

♦♦

2.488Gbps Serial to 155Mbps Parallel Conversion

♦♦

660mW Operating Power

♦♦

LVDS Data Outputs and Synchronization Inputs

♦♦

Self-Biasing PECL Inputs Ease AC Coupling

♦♦

Synchronization Inputs for Data Realignment and
Reframing

MAX3885

+3.3V, 2.488Gbps, SDH/SONET

1:16 Deserializer with LVDS Outputs

________________________________________________________________

Maxim Integrated Products

1

19-4767; Rev 4; 12/07

Pin Configuration appears at end of data sheet.

Ordering Information

Typical Operating Circuit

+

Denotes a lead-free package.

EVALUATION KIT

AVAILABLE

VCC = +3.3V

SERIAL DATA

INPUTS

VCC = +3.3V

MAX3875

DATA

AND

CLOCK

RECOVERY

133Ω 133Ω

86.6Ω

VCC = +3.3V

133Ω 133Ω

86.6Ω

PART TEMP RANGE PIN-PACKAGE

MAX3885ECB -40°C to +85°C 64 TQFP

MAX3885ECB+ -40°C to +85°C 64 TQFP

VCC = +3.3V

V

CC

PD15+

PD15-

PD0+

PD0-

PCLK+

PCLK-

SYNC+

SYNC-

100Ω*

•

•

•

100Ω*

100Ω*

OVERHEAD

TERMINATION

86.6Ω

86.6Ω

SD+

SD-

MAX3885

SCLK+

SCLK-

GND

*REQUIRED ONLY IF OVERHEAD CIRCUIT DOES NOT INCLUDE INTERNAL INPUT TERMINATION.
THIS SYMBOL REPRESENTS A TRANSMISSION LINE OF CHARACTERISTIC IMPEDANCE Z0 = 50Ω.

MAX3885

+3.3V, 2.488Gbps, SDH/SONET
1:16 Deserializer with LVDS Outputs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

Positive Supply Voltage (VCC)...............................-0.5V to +7.0V

Input Voltage Level (all inputs)...................-0.5V to (V

CC

+ 0.5V)

Output Current LVDS outputs .............................................10mA

Continuous Power Dissipation (T

A

= +85°C)

TQFP (derate 24mW/°C above +85°C).......................1000mW

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-60°C to +160°C

Lead Temperature (soldering, 10sec) .............................+300°C

DC ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +3.6V, differential loads = 100Ω ±1%, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= +3.3V,
T

A

= +25°C.)

Figure 1

Common-mode voltage = 50mV

Differential input voltage = 100mV

VIN= V

IH(MAX)

VIN= V

IL(MIN)

CONDITIONS

%±2.5 ±10ΔR

O

Change in Magnitude of Single­Ended Output Resistance for
Complementary Outputs

Ω40 95 140R

O

Single-Ended Output Resistance

mV±25ΔV

OS

Change in Magnitude of Output
Offset Voltage for Complementary
States

V1.125 1.275V

OS

Output Offset Voltage

mV±25Δ⎥V

OD

⎥

Change in Magnitude of Differential
Output Voltage for Complementary
States

mV250 400

⎥

V

OD⎥

Differential Output Voltage

V0.925V

OL

Output Low Voltage

V1.475V

OH

Output High Voltage

VVCC- 1.16 VCC- 0.88V

IH

Input High Voltage

mA200 280I

CC

Supply Current

Ω85 100 115R

IN

Differential Input Resistance

mV78V

HYST

Threshold Hysteresis

mV-100 100V

IDTH

Differential Input Threshold

V0 2.4V

I

Input Voltage Range

VVCC- 1.81 VCC- 1.48V

IL

Input Low Voltage

µA-900 900I

IH

Input High Current

µA-900 900I

IL

Input Low Current

UNITSMIN TYP MAXSYMBOLPARAMETER

PECL INPUTS (SD+/-, SCLK+/-)

LVDS INPUTS AND OUTPUTS (SYNC+/-, PCLK+/-, PD_+/-)

Note 1: AC Characteristics guaranteed by design and characterization.

AC ELECTRICAL CHARACTERISTICS

(V

CC

= +3.0V to +3.6V, differential loads = 100Ω ±1%, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VCC= +3.3V,

T

A

= +25°C.) (Note 1, Figure 4)

CONDITIONS

ps100t

H

Serial Data Hold Time

ps100t

SU

GHz2.488f

SCLK

Maximum Serial Clock Frequency

Serial Data Setup Time

ps200 450 900t

CLK-Q

Parallel Clock-to-Data Output Delay

UNITSMIN TYP MAXSYMBOLPARAMETER

MAX3885

+3.3V, 2.488Gbps, SDH/SONET

1:16 Deserializer with LVDS Outputs

_______________________________________________________________________________________

3

Typical Operating Characteristics

(VCC= +3.3V, TA = +25°C, unless otherwise noted.)

MAXIMUM SERIAL CLOCK FREQUENCY

vs. TEMPERATURE

4.4

4.3

4.2

4.1

MAX SERIAL CLOCK FREQUENCY (GHz)

4.0

-50 0-25 25 50 75 100
TEMPERATURE (°C)

VCC = 3.6V

VCC = 3V

100

MAX3885-01

SERIAL DATA-SETUP TIME (ps)

SUPPLY CURRENT vs. TEMPERATURE

300

SERIAL DATA-SETUP TIME

vs. TEMPERATURE

80

60

40

20

0

-50 0-25 25 50 75 100
TEMPERATURE (°C)

SERIAL DATA-HOLD TIME

vs. TEMPERATURE

0

MAX3885-02

-20

-40

-60

SERIAL DATA-HOLD TIME (ps)

-80

-100

-50 0-25 25 50 75 100
TEMPERATURE (°C)

PARALLEL CLOCK TO DATA OUTPUT

PROPAGATION DELAY vs. TEMPERATURE

700

MAX3885-03

250

VCC = 3.6V

200

SUPPLY CURRENT (mA)

150

100

-50 0-25 25 50 75 100
TEMPERATURE (°C)

VCC = 3V

MAX3885-04

600

500

400

300

PCLK TO DATA OUTPUT PROPAGATION DELAY (ps)

200

-50 0-25 25 50 75 100
TEMPERATURE (°C)

MAX3885-05