MAXIM MAX3783 Technical data

General Description

The MAX3783 is a dual serial multiplexer (mux) and
buffer with selectable line-side loopback for system
interconnect and serial backplane applications up to

2.7Gbps. Each independent channel consists of a trans­mitter with fanout of two and a receiver with a 2:1 input
mux. Selectable loopback paths support system testing.

Operating from a single 3.3V supply, this device has
current-mode logic (CML) inputs and outputs, which
can be AC-coupled for PECL compatibility, if desired.
The IC is packaged in a compact 48-pin TQFP-EP pack­age with exposed pad. Typical power consumption is

1.12W.

Applications

2.7Gbps Serial Communications

System Interconnect

Serial Backplane

Fail-Over and Protection Switching

Features

♦ Provides Redundant Serial I/O

♦ 11ps Deterministic Jitter

♦ Selectable Loopback

♦ On-Chip 50Ω Termination Resistors

♦ 3.3V Power Supply

♦ Two-Port Integration

MAX3783

2.7Gbps Dual Mux/Buffer with Loopback

Pin Configuration

Ordering Information

19-2197; Rev 2; 1/08

Typical Application Circuit appears at end of data sheet.

EVALUATION KIT

AVAILABLE

*EP = Exposed pad.

+

Denotes a lead-free package.

________________________________________________________________

Maxim Integrated Products

1

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.

PART TEMP RANGE PIN-PACKAGE

MAX3783UCM 0°C to +85°C 48 TQFP-EP*

MAX3783UCM+ 0°C to +85°C 48 TQFP-EP*

SELA

VCCSOA+

SOA-

4847464544434241403938

1

GND

2

SIA-

3

SIA+

4

V

CC

5

LB1A

6

LB2A

7

LB1B

8

LB2B

9

V

CC

10

SIB+

11

SIB-

12

GND

1314151617181920212223

CC

V

SELB

SOB+

SOB-

TQFP-EP*

*EXPOSED PAD MUST BE SOLDERED TO SUPPLY GROUND ON THE CIRCUIT BOARD.

VCCLO1A+

LO1A-

VCCLO2A+

LO2A-

VCCGND

37

36

35

34

33

32

MAX3783

CC

V

LO1B+

LO1B-

CC

V

LO2B-

LO2B+

31

30

29

28

27

26

25

24

CC

V

GND

LI2A+
LI2A­V

CC

LI1A+
LI1A­GND
GND
LI1B­LI1B+
V

CC

LI2B­LI2B+

MAX3783

2.7Gbps Dual Mux/Buffer with Loopback

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= 3.0V to 3.6V, serial data rate = 2.75Gbps, TA= 0°C to +85°C. Typical values at VCC= 3.3V, TA= +25°C, unless otherwise
noted.)

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.

Note 2: Tested using a repeating 1010 pattern at 500Mbps.
Note 3: AC specifications are guaranteed by design and characterization.
Note 4: Deterministic jitter is measured with a repeating K28.5 pattern.
Note 5: With the peak-to-peak input swing on the selected (transmitted) CML input equal to or greater than that on the nonselected

inputs.

Note 6: AC specifications are guaranteed by test.

Supply Voltage, V

CC

...............................................-0.5V to 4.0V

Continuous Current at Serial Outputs...............................±36mA

Voltage at SEL_, LB_ Pins ..........................-0.5V to (V

CC

+ 0.5V)

Common-Mode Input Voltage (SI_, LI_) .....-0.5V to (V

CC

+ 0.5V)

Differential Input Voltage (SI_, LI_) (Note 1) .......................±2.8V

Continuous Power Dissipation (T

A

= +85°C)

48-Pin TQFP-EP (derate 27mW/°C above +85°C) .........1.76W

Storage Ambient Temperature ..........................-55°C to +150°C

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

Note 1: The sum of the common-mode voltage and differential voltage on any input pin must be within -0.5V to (V

CC

+ 0.5V).

PARAMETER S YMBOL CONDITIONS MIN TYP MAX UNITS

Max imum Serial Data Rate 2.75 3.125 Gbps

Power Dis sipation AC-coupled inputs, outputs 1.12 1.68 W

Supply Current ICC 340 466 mA

CML Differential Output Voltage VOD RL = 50 to VCC, or 100 differential (Note 2) 1200 1500 2200 mVp-p

CML Differential Input Voltage VID 200 1600 2200 mVp-p

CML Output Impedance R

CML Input Impedance RIN Differential 85 100 116 

Random Jitter (Note 3) 1 2 ps

Determin istic Jitter (Notes 3, 4, 5) 11 25 ps

CML Output Edge Speed
(20% to 80%)

Propagation Delay LI_ to SO_, SI_ to LO_, LI _ to LO_ (Note 3) 340 500 ps
Multiplexer Switch Time SEL_ or LB_ to valid output 9 ns

TTL Input Current High VIH = +2.0V to (VCC +0.3V) 180 μA

TTL Input Current Low VIL = -0.3V to +0.8V 440 μA

Single ended 42.5 50 57.5 

OUT

t

, t

R

2.5Gbps input (Note 6) 70 135

F

1.25Gbps input (Note 3) 80 200

RMS

p-p

ps

MAX3783

2.7Gbps Dual Mux/Buffer with Loopback

_______________________________________________________________________________________

3

Typical Operating Characteristics

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

ELECTRICAL EYE DIAGRAM

23

- 1 PRBS PATTERN

MAX3783 toc01

195mV/

88ps/div

195mV/

2.75 Gbps, 2

div

SUPPLY CURRENT vs. TEMPERATURE

500

450

div

ELECTRICAL EYE DIAGRAM

2.75 Gbps, K28.5 PATTERN

88ps/div

MAX3783 toc04

ELECTRICAL EYE DIAGRAM

3.125 Gbps, K28.5 PATTERN

MAX3783 toc02

195mV/

div

88ps/div

CML DIFFERENTIAL OUTPUT VOLTAGE

vs. CML DIFFERENTIAL INPUT VOLTAGE

1.60

MEASURED USING 1010
PATTERN, 500Mbps

1.55

MAX3783 toc05

MAX3783 toc03

400

350

SUPPLY CURRENT (mA)

300

250

03015 45 60 75 90

TEMPERATURE (°C)

DETERMINISTIC JITTER vs. CML

DIFFERENTIAL INPUT VOLTAGE

25

20

15

DJ (ps)

10

5

0

200 1200700 1700 2200

3.125Gbps

2.75Gbps

VID (mV)

MAX3783 toc06

(V)

1.50

OD

V

1.45

1.40

200 1200700 1700 2200

VID (mV)

MULITPLEXER SWITCH TIME

LO2A+

10ns

9ns

LB2A

LO2A-

10ns/div

MAX3783 toc07