MAX9129

Manufacturer Part NumberMAX9129
DescriptionThe MAX9129 is a quad bus low-voltage differential signaling (BLVDS) driver with flow-through pinout
ManufacturerMaxim
MAX9129 datasheet
 


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19-2100; Rev 0; 8/01
General Description
The MAX9129 is a quad bus low-voltage differential sig-
naling (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 trans-
lates them to output levels of 250mV to 450mV (stan-
dard 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 imped-
ance 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.
Cell Phone Base Stations
Add/Drop Muxes
Digital Cross-Connects
DSLAMs
Network Switches/Routers
Backplane Interconnect
Clock Distribution
CARD 1A
MAX9129
MAX9121
BUS A
R
t
BUS B
R
t
________________________________________________________________ Maxim Integrated Products
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.
Quad Bus LVDS Driver with
Flow-Through Pinout
o Drive LVDS Levels into a 27Ω Load
o 1ns (0% to 100%) Minimum Transition Time
Reduces Reflections
o Guaranteed 200Mbps (100MHz) Data Rate
o Enable Pins for High-Impedance Output
o High-Impedance Outputs when Powered Off
o Glitch-Free Power-Up and Power-Down
o Hot Swappable
o Flow-Through Pinout
o Available in Tiny QFN Package (50% Smaller
than TSSOP)
o Single +3.3V Supply
PART
MAX9129EGE
Applications
MAX9129EUE
Functional Diagram appears at end of data sheet.
Pin Configurations appear at end of data sheet.
CARD 10A
CARD 1B
MAX9129
MAX9121
MAX9129
MULTIPOINT FULL-DUPLEX TRANSMIT AND RECEIVE BUS
Features
Ordering Information
TEMP. RANGE
PIN-PACKAGE
-40°C to +85°C
16 QFN
-40°C to +85°C
16 TSSOP
Typical Applications Circuit
CARD 2B
MAX9121
MAX9129
MAX9121
R
t
= TERMINATION
R
RESISTOR
t
R
t
1

MAX9129 Summary of contents

  • Page 1

    ... Rev 0; 8/01 General Description The MAX9129 is a quad bus low-voltage differential sig- naling (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 trans- lates them to output levels of 250mV to 450mV (stan- dard LVDS levels) into a 27Ω ...

  • Page 2

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

  • Page 3

    ... Note the magnitude difference of any differential propagation delays between devices operating over the rated supply SKD4 and temperature ranges. Note 10: Signal generator conditions: V MAX9129 output criteria: duty cycle = 45% to 55%, V _______________________________________________________________________________________ Quad Bus LVDS Driver with Flow-Through Pinout = 15pF high low -40° ...

  • Page 4

    ... Quad Bus LVDS Driver with Flow-Through Pinout (MAX9129EUE (TSSOP package +3.3V OUTPUT HIGH VOLTAGE vs. SUPPLY VOLTAGE 1.48 1.47 1.46 1.45 1.44 3.0 3.3 3.6 SUPPLY VOLTAGE (V) OUTPUT HIGH-IMPEDANCE CURRENT vs. SUPPLY VOLTAGE 430 OUT_ CC 428 426 424 422 420 3.0 3.3 3.6 SUPPLY VOLTAGE (V) OUTPUT OFFSET VOLTAGE vs. SUPPLY VOLTAGE 1.305 1.300 1 ...

  • Page 5

    ... V CC SUPPLY CURRENT vs. TEMPERATURE -40 - TEMPERATURE (°C) DIFFERENTIAL SKEW vs. SUPPLY VOLTAGE 3.0 3.3 SUPPLY VOLTAGE (V) _______________________________________________________________________________________ Quad Bus LVDS Driver with Flow-Through Pinout Typical Operating Characteristics (continued) = +3.3V 27Ω 15pF +25°C, unless otherwise noted.) (Note 5) ...

  • Page 6

    Quad Bus LVDS Driver with Flow-Through Pinout PIN NAME QFN TSSOP IN_ GND 10, 11 12, 13, ...

  • Page 7

    ... Transition times are designed to reduce reflections, yet enable high data rates. The MAX9129 can be used in conjunction with standard quad LVDS receivers, such _______________________________________________________________________________________ Quad Bus LVDS Driver with Flow-Through Pinout Table 1 ...

  • Page 8

    ... Reflections add and sub- tract from the signal being driven and cause decreased noise margin and jitter. The MAX9129 is designed for a 8 _______________________________________________________________________________________ minimum transition time of 1ns (rated 0.6ns from 20% to ...

  • Page 9

    EN IN1 IN2 V CC GND IN3 IN4 EN Figure 6. Suggested Layout for QFN Package Chip Information TRANSISTOR COUNT: 948 PROCESS: CMOS _______________________________________________________________________________________ Quad Bus LVDS Driver with Flow-Through Pinout OUT1- OUT1+ GND OUT2+ OUT2- OUT3- OUT3+ OUT4+ OUT4- ...

  • Page 10

    ... MAX9129 13 OUT2 OUT3- GND 11 OUT3+ 4 IN3 10 OUT4+ GND 9 OUT4- TSSOP OUT1+ OUT1- OUT2+ OUT2- OUT3+ OUT3- OUT4+ OUT4- Pin Configurations IN1 EN OUT1- OUT1+ GND GND 12 OUT2+ 11 OUT2- MAX9129 10 OUT3- 9 OUT3+ GND IN4 EN OUT4- OUT4+ QFN (4mm x 4mm) (CONTACTS UNDER QFN) ...

  • Page 11

    Quad Bus LVDS Driver with ______________________________________________________________________________________ Flow-Through Pinout Package Information 11 ...

  • Page 12

    Quad Bus LVDS Driver with Flow-Through Pinout 12 ______________________________________________________________________________________ Package Information (continued) ...

  • Page 13

    ... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 © ...