MAXIM MAX9125, MAX9126 User Manual

General Description

The MAX9125/MAX9126 quad low-voltage differential
signaling (LVDS) line receivers are ideal for applica­tions requiring high data rates, low power, and reduced
noise. The MAX9125/MAX9126 are guaranteed to
receive data at speeds up to 500Mbps (250MHz) over
controlled-impedance media of approximately 100Ω.
The transmission media may be printed circuit (PC)
board traces or cables.

The MAX9125/MAX9126 accept four LVDS differential
inputs and translate them to 3.3V CMOS outputs. The
MAX9126 features integrated parallel termination resis­tors (nominally 115Ω), which eliminate the requirement
for four discrete termination resistors and reduce stub
length. The MAX9125 inputs are high impedance and
require an external termination resistor when used in a
point-to-point connection.

The devices support a wide common-mode input range
of 0.05V to 2.35V, allowing for ground potential differ­ences and common-mode noise between the driver
and the receiver. A fail-safe feature sets the output high
when the inputs are open, or when the inputs are
undriven and shorted or parallel terminated. The EN
and EN inputs control the high-impedance output and
are common to all four receivers. Inputs conform to the
ANSI TIA/EIA-644 LVDS standard. The MAX9125/
MAX9126 operate from a single +3.3V supply, are
specified for operation from -40°C to +85°C, and are
available in 16-pin TSSOP and SO packages. Refer to
the MAX9124 data sheet for a quad LVDS line driver.

Applications

Digital Copiers

Laser Printers

Cellular Phone Base Stations

Add/Drop Muxes

Digital Cross-Connects

DSLAMs

Network Switches/Routers

Backplane Interconnect

Clock Distribution

Features

♦ Integrated Termination Eliminates Four External

Resistors (MAX9126)

♦ Pin Compatible with DS90LV032A

♦ Guaranteed 500Mbps Data Rate

♦ 300ps Pulse Skew (max)

♦ Conform to ANSI TIA/EIA-644 LVDS Standard

♦ Single +3.3V Supply

♦ Low 70µA Shutdown Supply Current

♦ Fail-Safe Circuit

MAX9125/MAX9126

Quad LVDS Line Receivers with

Integrated Termination

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

115Ω

MAX9124

MAX9126

115Ω

115Ω

115Ω

R

X

LVDS SIGNALS

100Ω SHIELDED TWISTED CABLE OR MICROSTRIP PC BOARD TRACES

LVTTL/LVCMOS

DATA INPUT

LVTTL/LVCMOS
DATA OUTPUT

R

X

R

X

R

X

T

X

T

X

T

X

T

X

Typical Application Circuit

19-1908; Rev 0; 5/01

EVALUATION KIT

AVAILABLE

Pin Configuration appears at end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART TEMP. RANGE PIN-PACKAGE

MAX9125EUE -40°C to +85°C 16 TSSOP

MAX9125ESE -40°C to +85°C 16 SO

MAX9126EUE -40°C to +85°C 16 TSSOP

MAX9126ESE -40°C to +85°C 16 SO

MAX9125/MAX9126

Quad LVDS Line Receivers with
Integrated Termination

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +3.6V, differential input voltage |

V

ID

| = 0.1V to 1.0V, common-mode voltage V

CM

= |

V

ID

/2|

to 2.4V - |V

ID

/2|

, T

A

=

-40°C to +85°C. Typical values are at V

CC

= +3.3V, TA= +25°C, unless otherwise noted.) (Note 1)

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.

VCCto GND...........................................................-0.3V to +4.0V

IN_+, IN_- to GND .................................................-0.3V to +4.0V

EN, EN to GND...........................................-0.3V to (V

CC

+ 0.3V)

OUT_ to GND .............................................-0.3V to (V

CC

+ 0.3V)

Continuous Power Dissipation (T

A

= +70°C)

16-Pin TSSOP (derate 9.4mW/°C above +70°C) .........755mW

16-Pin SO (derate 8.7mW/°C above +70°C)................696mW

Storage Temperature Range .............................-65°C to +150°C

Maximum Junction Temperature .....................................+150°C

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

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

ESD Protection (Human Body Model) IN_+, IN_-, OUT_............±7.5kV

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

LVDS INPUTS (IN_+, IN_-)

V

TH

mV

V

TL

mV

0.1V ≤VID≤ 0.6V, -20 20

Input Current (MAX9125)

I

IN

_+,

I

IN

_-

0.6V <V

ID

≤ 1.0V -25 25

µA

0.1V ≤VID≤ 0.6V, V

CC

= 0 -20 20

Power-Off Input Current
(MAX9125)

IIN_+,

I

IN

_-

0.6V <V

ID

≤ 1.0V, V

CC

= 0 -25 25

µA

Input Resistor 1 R

IN1

V

CC

= +3.6V or 0, Figure 1 35 kΩ

Input Resistor 2 R

IN2

V

CC

= +3.6V or 0, Figure 1 132 kΩ

Differential Input Resistance
(MAX9126)

R

DIFF

V

CC

= +3.6V or 0, Figure 1 90

Ω

LVCMOS/LVTTL OUTPUTS (OUT_)

Open, undriven short, or
undriven 100Ω parallel
termination

2.7 3.2

IOH =

-4.0mA

V

ID

= +100mV 2.7 3.2

Open or undriven short 2.7 3.2

Output High Voltage V

OH

IOH =

-4.0mA
V

ID

= +100mV 2.7 3.2

V

Output Low Voltage V

OL

IOL = +4.0mA, VID = -100mV 0.1

V

Output Short-Circuit Current I

OS

-15

mA

I

OZ

Disabled, V

OUT

_ = 0 or V

CC

-10

µA

Differential Input High Threshold

Differential Input Low Threshold

Output High-Impedance Current

-100

(MAX9125)

(MAX9126)

Enabled, VID = +100mV, V

_ = 0 (Note 2)

OUT

100

115 132

0.25

-120

+10

MAX9125/MAX9126

Quad LVDS Line Receivers with

Integrated Termination

_______________________________________________________________________________________ 3

DC ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +3.6V, differential input voltage |

V

ID

| = 0.1V to 1.0V, common-mode voltage V

CM

= |

V

ID

/2|

to 2.4V - |V

ID

/2|

, T

A

=

-40°C to +85°C. Typical values are at V

CC

= +3.3V, TA= +25°C, unless otherwise noted.) (Note 1)

AC ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +3.6V, CL= 10pF, differential input voltage |V

ID

| = 0.2V to 1.0V, common-mode voltage V

CM

= |VID/2| to 2.4V

-

|V

ID

/2|, input rise and fall time = 1ns (20% to 80%), input frequency = 100MHz, TA= -40°C to +85°C. Typical values are at VCC=

+3.3V, V

CM

= 1.2V, |V

ID

| = 0.2V, T

A

= +25°C, unless otherwise noted.) (Notes 3, 4)

LOGIC INPUTS (EN, EN)

Input High Voltage V

Input Low Voltage V

Input Current I

SUPPLY

Supply Current I

Disabled Supply Current I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

IH

IL

IN

CC

CCZ

VIN = VCC or 0 -15 15 µA

Enabled, inputs open 9 15 mA

Disabled, inputs open 70 500 µA

CC

2.0 V

0 0.8 V

Differential Propagation Delay
High to Low

Differential Propagation Delay
Low to High

Differential Pulse Skew
[t

PHLD

Differential Channel-to-Channel
Skew (Note 6)

Differential Part-to-Part Skew
(Note 7)

Differential Part-to-Part Skew
(Note 8)

Rise Time t

Fall Time t

Disable Time High to Z t

Disable Time Low to Z t

Enable Time Z to High t

Enable Time Z to Low t

Maximum Operating Frequency
(Note 9)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

t

] (Note 5)

PLHD

-

t

PHLD

t

PLHD

t

SKD1

t

SKD2

t

SKD3

t

SKD4

TLH

THL

PHZ

PLZ

PZH

PZL

f

MAX

Figures 2 and 3 1.8 2.4 3.3 ns

Figures 2 and 3 1.8 2.3 3.3 ns

Figures 2 and 3 100 300 ps

Figures 2 and 3 400 ps

Figures 2 and 3 0.8 ns

Figures 2 and 3 1.5 ns

Figures 2 and 3 0.34 1.2 ns

Figures 2 and 3 0.32 1.2 ns

RL = 2kΩ, Figures 4 and 5 12 ns

RL = 2kΩ, Figures 4 and 5 12 ns

RL = 2kΩ, Figures 4 and 5 17 ns

RL = 2kΩ, Figures 4 and 5 17 ns

All channels switching 250 300 MHz

V

2.2

2.4

2.3

2.6

2.5

2.7

2.8

100 900 1300500 1700 2100 2500

DIFFERENTIAL PROPAGATION DELAY

vs. DIFFERENTIAL INPUT VOLTAGE

MAX9125/6 toc03

DIFFERENTIAL INPUT VOLTAGE (mV)

DIFFERENTIAL PROPAGATION DELAY (ns)

t

PHLD

t

PLHD

Typical Operating Characteristics

(VCC= +3.3V, |V

ID

| = 200mV, V

CM

= +1.2V, CL= 10pF, frequency = 10MHz, TA= +25°C, unless otherwise noted.) (Figures 2 and 3)

MAX9125/MAX9126

Quad LVDS Line Receivers with
Integrated Termination

4 _______________________________________________________________________________________

Note 1: Current into a pin is defined as positive. Current out of a pin is defined as negative. All voltages are referenced to ground

except V

TH

, VTL, and VID.

Note 2: Short only one output at a time. Do not exceed the absolute maximum junction temperature specification.
Note 3: AC parameters are guaranteed by design and characterization.
Note 4: C

L

includes scope probe and test jig capacitance.

Note 5: t

SKD1

is the magnitude difference of differential propagation delays in a channel; t

SKD1

= |t

PHLD

- t

PLHD

|.

Note 6: t

SKD2

is the magnitude difference of the t

PLHD

or t

PHLD

of one channel and the t

PLHD

or t

PHLD

of any other channel on the

same part.

Note 7: t

SKD3

is the magnitude difference of any differential propagation delays between parts operating over rated conditions at

the same V

CC

and within 5°C of each other.

Note 8: t

SKD4

is the magnitude difference of any differential propagation delays between parts operating over rated conditions.

Note 9: f

MAX

generator output conditions: tR= tF< 1ns (0% to 100%), 50% duty cycle, VOL= 1.1V, VOH= 1.3V. Receiver output

criteria: 60% to 40% duty cycle, V

OL

= 0.4V (max), VOH= 2.7V (min), load = 10pF.

100

0

0.01 0.1 1 10 100 1000

SUPPLY CURRENT vs. SWITCHING

FREQUENCY, FOUR CHANNELS SWITCHING

20

MAX9125/6 toc01

SWITCHING FREQUENCY (MHz)

SUPPLY CURRENT (mA)

40

60

80

10

30

50

70

90

VCC = +3.6V

VCC = +3.3V

VCC = +3V

2.8

2.6

2.4

2.2

2.0

-40 10-15 35 60 85

DIFFERENTIAL PROPAGATION DELAY

vs. TEMPERATURE

MAX9125/6 toc02

TEMPERATURE (°C)

DIFFERENTIAL PROPAGATION DELAY (ns)

t

PHLD

t

PLHD

AC ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +3.6V, CL = 10pF, differential input voltage |

V

ID

| = 0.2V to 1.0V, common-mode voltage V

CM

= |

V

ID

/2|

to 2.4V

-

|V

ID

/2

|, input rise and fall time = 1ns (20% to 80%), input frequency = 100MHz, T

A

= -40°C to +85°C. Typical values are at VCC=

+3.3V, V

CM

= 1.2V, |V

ID

| = 0.2V, T

A

= +25°C, unless otherwise noted.) (Notes 3, 4)