MAXIM MAX9129 User Manual

General Description

The MAX9129 is a quad bus low-voltage differential sig­naling (BLVDS) driver with flow-through pinout. This
device is designed to drive a heavily loaded multipoint
bus with controlled transition times (1ns 0% to 100%
minimum) for reduced reflections. The MAX9129
accepts four LVTTL/LVCMOS input levels and trans­lates them to output levels of 250mV to 450mV (stan­dard LVDS levels) into a 27Ω load at speeds up to
200Mbps (100MHz).

The power-on reset ensures that all four outputs are
disabled and high impedance during power up and
power down. The outputs can be set to high imped­ance by two enable inputs, EN and EN, thus dropping
the device to a low-power state of 11mW. The enables
are common to all four drivers. The flow-through pinout
simplifies PC board layout and reduces crosstalk by
keeping the LVTTL/LVCMOS inputs and BLVDS outputs
separated.

The MAX9129 operates from a single +3.3V supply and
is specified for operation from -40°C to +85°C. It is
available in 16-pin QFN and TSSOP packages. Refer to
the MAX9121 data sheet for a quad LVDS line receiver
with flow-through pinout.

Applications

Cell Phone Base Stations

Add/Drop Muxes

Digital Cross-Connects

DSLAMs

Network Switches/Routers

Backplane Interconnect

Clock Distribution

Features

♦ Drive LVDS Levels into a 27Ω Load

♦ 1ns (0% to 100%) Minimum Transition Time

Reduces Reflections

♦ Guaranteed 200Mbps (100MHz) Data Rate

♦ Enable Pins for High-Impedance Output

♦ High-Impedance Outputs when Powered Off

♦ Glitch-Free Power-Up and Power-Down

♦ Hot Swappable

♦ Flow-Through Pinout

♦ Available in Tiny QFN Package (50% Smaller

than TSSOP)

♦ Single +3.3V Supply

MAX9129

Quad Bus LVDS Driver with

Flow-Through Pinout

MAX9129 MAX9121 MAX9129 MAX9121 MAX9129 MAX9121 MAX9129 MAX9121

R

t

R

t

R

t

BUS A

BUS B

R

t

CARD 1A CARD 10A CARD 1B CARD 2B

= TERMINATION
RESISTOR

R

t

MULTIPOINT FULL-DUPLEX TRANSMIT AND RECEIVE BUS

Typical Applications Circuit

19-2100; Rev 0; 8/01

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.

Functional Diagram appears at end of data sheet.

Pin Configurations appear at end of data sheet.

Ordering Information

________________________________________________________________ Maxim Integrated Products 1

PART TEMP. RANGE PIN-PACKAGE

MAX9129EGE -40°C to +85°C 16 QFN

MAX9129EUE -40°C to +85°C 16 TSSOP

MAX9129

Quad Bus LVDS Driver with
Flow-Through Pinout

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.

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

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

CC

+ 0.3V)

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

Short-Circuit Duration (OUT_+, OUT_-) .....................Continuous

Continuous Power Dissipation (T

A

= +70°C)

16-Pin QFN (derate 18.5mW/°C above +70°C) .........1481mW

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

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

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

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

ESD Protection

Human Body Model, OUT_+, OUT_- ...............................±8kV

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

DC ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +3.6V, RL= 27Ω ±1%, EN = high, EN = low, TA= -40°C to +85°C, unless otherwise noted. Typical values are at V

CC

= +3.3V, TA= +25°C.) (Notes 1, 2)

BLVDS OUTPUTS (OUT_+, OUT_-)

Differential Output Voltage V

Change in Magnitude of V
Between Complementary Output
States

Offset Voltage V

Change in Magnitude of V
Between Complementary Output
States

Output High Voltage V

Output Low Voltage V

Differential Output Short-Circuit
Current

Output Short-Circuit Current I

Output High-Impedance Current I

Power-Off Output Current I

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Figure 1 250 371 450 mV

Figure 1 1 25 mV

OD

Figure 1 1.125 1.29 1.375 V

OS

Figure 1 5 25 mV

OS

OL

VOD = 0 20 mA

OUT_+ = 0 at IN_ = VCC or
OUT_- = 0 at IN_ = 0

Disabled, OUT_+ = 0 or VCC, OUT_- = 0
or V

CC

VCC = 0 or open, EN = EN = IN_ = 0,
OUT_+ = 0 or 3.6V, OUT_- = 0 or 3.6V

OD

OS

∆V

I

OD

∆V

OH

OSD

OS

OZ

OFF

1.465 1.6 V

0.90 1.085 V

-20 mA

-1 1 µA

-1 1 µA

Output Capacitance C

INPUTS (IN_, EN, EN)

High-Level Input Voltage V

Low-Level Input Voltage V

Input Current I

SUPPLY CURRENT

Supply Current I

Disabled Supply Current I

OUT

IN

CC

CCZ

C ap aci tance fr om OU T_+ or O U T_- to G N D 4.3 pF

IH

IL

IN_, EN, EN = 0 or V

RL = 27Ω, IN_ = VCC or 0 for all channels 58 70 mA

Disabled 3.2 5 mA

CC

2.0 V

GND 0.8 V

-15 15 µA

CC

V

MAX9129

Quad Bus LVDS Driver with

Flow-Through Pinout

_______________________________________________________________________________________ 3

AC ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +3.6V, RL= 27Ω ±1%, CL= 15pF, EN = high, EN = low, TA= -40°C to +85°C, unless otherwise noted. Typical values
are at V

CC

= +3.3V, TA= +25°C.) (Notes 3, 4, 5)

Note 1: Maximum and minimum limits over temperature are guaranteed by design and characterization. Devices are 100% tested

at T

A

= +25°C.

Note 2: Current into the device is defined as positive, and current out of the device is defined as negative. All voltages are

referenced to ground except V

OD

and ∆VOD.

Note 3: AC parameters are guaranteed by design and characterization.
Note 4: C

L

includes probe and jig capacitance.

Note 5: Signal generator conditions: V

OL

= 0, VOH= VCC, f = 100MHz, 50% duty cycle, RO= 50Ω, tR= tF= 1ns (10% to 90%).

Note 6: t

SKD1

is the magnitude difference of differential propagation delays. t

SKD1

= | t

PHLD

- t

PLHD |

.

Note 7: t

SKD2

is the magnitude difference of t

PHLD

or t

PLHD

of one channel to the t

PHLD

or t

PLHD

of another channel on the

same device.

Note 8: t

SKD3

is the magnitude difference of any differential propagation delays between devices at the same VCCand within 5°C

of each other.

Note 9: t

SKD4

is the magnitude difference of any differential propagation delays between devices operating over the rated supply

and temperature ranges.

Note 10: Signal generator conditions: V

OL

= 0, VOH= VCC, f = 100MHz, 50% duty cycle, RO= 50Ω, tR= tF= 1ns (10% to 90%).

MAX9129 output criteria: duty cycle = 45% to 55%, V

OD

≥ 250mV, all channels switching.

Differential Propagation Delay
High to Low

Differential Propagation Delay
Low to High

Differential Pulse Skew (Note 6) t

Differential Channel-to-Channel
Skew (Note 7)

Differential Part-to-Part Skew
(Note 8)

Differential Part-to-Part Skew
(Note 9)

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 10)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

t

PHLD

t

PLHD

SKD1

t

SKD2

t

SKD3

t

SKD4

TLH

THL

PHZ

PLZ

PZH

PZL

f

MAX

Figures 2 and 3 1.0 1.98 3.0 ns

Figures 2 and 3 1.0 1.92 3.0 ns

Figures 2 and 3 300 ps

Figures 2 and 3 450 ps

Figures 2 and 3 1.2 ns

Figures 2 and 3 2.0 ns

Figures 2 and 3

Figures 2 and 3

Figures 4 and 5 8 ns

Figures 4 and 5 8 ns

Figures 4 and 5 10 ns

Figures 4 and 5 10 ns

Figure 2 100 MHz

MAX9129EGE 0.60 1.19 1.55

MAX9129EUE 0.60 1.09 1.40

MAX9129EGE 0.60 1.12 1.55

MAX9129EUE 0.60 1.02 1.40

ns

ns

MAX9129

Quad Bus LVDS Driver with
Flow-Through Pinout

4 _______________________________________________________________________________________

Typical Operating Characteristics

(MAX9129EUE (TSSOP package), VCC= +3.3V, RL= 27Ω, CL = 15pF, TA= +25°C, unless otherwise noted.) (Note 5)

1.48

1.47

1.46

1.45

1.44

3.0 3.3 3.6

OUTPUT HIGH VOLTAGE

vs. SUPPLY VOLTAGE

MAX9129 toc01

SUPPLY VOLTAGE (V)

OUTPUT HIGH VOLTAGE (V)

1.12

1.10

1.08

1.06

1.04

3.0 3.3 3.6

OUTPUT LOW VOLTAGE

vs. SUPPLY VOLTAGE

MAX9129 toc02

SUPPLY VOLTAGE (V)

OUTPUT LOW VOLTAGE (V)

-14.08

-14.09

-14.10

-14.11

-14.12

3.0 3.3 3.6

OUTPUT SHORT CURRENT (IOS)

vs. SUPPLY VOLTAGE

MAX9129 toc03

SUPPLY VOLTAGE (V)

OUTPUT SHORT CURRENT (mA)

420

422

426

424

428

430

3.0 3.3 3.6

OUTPUT HIGH-IMPEDANCE CURRENT

vs. SUPPLY VOLTAGE

MAX9129 toc04

SUPPLY VOLTAGE (V)

OUTPUT HIGH-IMPEDANCE CURRENT (pA)

V

OUT_

= VCC OR 0

372.0

371.5

371.0

370.5

370.0

3.0 3.3 3.6

DIFFERENTIAL OUTPUT VOLTAGE vs.

SUPPLY VOLTAGE

MAX9129 toc05

SUPPLY VOLTAGE (V)

DIFFERENTIAL OUTPUT VOLTAGE (mV)

0

0.500

0.250

1.000

0.750

1.500

1.250

1.750

10 50 7030 90 110 130 150

DIFFERENTIAL OUTPUT VOLTAGE

vs. LOAD RESISTANCE

MAX9129 toc06

LOAD RESISTANCE (Ω)

DIFFERENTIAL OUTPUT VOLTAGE (V)

1.265

1.270

1.275

1.280

1.285

1.290

1.295

1.300

1.305

3.0 3.3 3.6

OUTPUT OFFSET VOLTAGE

vs. SUPPLY VOLTAGE

MAX9129 toc07

SUPPLY VOLTAGE (V)

OUTPUT OFFSET VOLTAGE (V)

55

57

61

59

63

65

0101 1000

SUPPLY CURRENT

vs. FREQUENCY

MAX9129 toc08

FREQUENCY (MHz)

SUPPLY CURRENT (mA)

100

56.7

56.9

57.3

57.1

57.5

57.7

3.0 3.3 3.6

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX9129 toc09

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)