19-2100; Rev 0; 8/01
Quad Bus LVDS Driver with
Flow-Through Pinout
General Description
Features
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).
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
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.
o Flow-Through Pinout
o Available in Tiny QFN Package (50% Smaller
than TSSOP)
o Single +3.3V Supply
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.
Ordering Information
PART
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QFN
MAX9129EGE
MAX9129EUE
Applications
16 TSSOP
Cell Phone Base Stations
Add/Drop Muxes
Digital Cross-Connects
DSLAMs
Functional Diagram appears at end of data sheet.
Pin Configurations appear at end of data sheet.
Network Switches/Routers
Backplane Interconnect
Clock Distribution
Typical Applications Circuit
CARD 1A
MAX9129
CARD 10A
MAX9129
CARD 1B
MAX9129
CARD 2B
MAX9129
MAX9121
MAX9121
MAX9121
MAX9121
BUS A
R
R
t
t
BUS B
= TERMINATION
RESISTOR
MULTIPOINT FULL-DUPLEX TRANSMIT AND RECEIVE BUS
R
R
t
t
R
t
________________________________________________________________ Maxim Integrated Products
1
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.