19-2100; Rev 0; 8/01
Quad Bus LVDS Driver with
Flow-Through Pinout
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.
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
Features
MAX9129
Ordering Information
PART
MAX9129EGE
MAX9129EUE
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QFN
16 TSSOP
Applications
Cell Phone Base Stations
Add/Drop Muxes
Digital Cross-Connects
DSLAMs
Network Switches/Routers
Backplane Interconnect
Clock Distribution
Functional Diagram appears at end of data sheet.
Pin Configurations appear at end of data sheet.
Typical Applications Circuit
CARD 1A
MAX9129
MAX9121
CARD 10A
MAX9129
MAX9121
CARD 1B
MAX9129
MAX9121
CARD 2B
MAX9129
MAX9121
BUS A
R
t
R
t
MULTIPOINT FULL-DUPLEX TRANSMIT AND RECEIVE BUS
= TERMINATION
RESISTOR
BUS B
R
t
R
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.
Quad Bus LVDS Driver with
Flow-Through Pinout
MAX9129
ABSOLUTE MAXIMUM RATINGS
V
CC
to 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
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.
DC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, R
L
= 27Ω ±1%, EN = high,
EN
= low, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= +3.3V, T
A
= +25°C.) (Notes 1, 2)
PARAMETER
Differential Output Voltage
Change in Magnitude of V
OD
Between Complementary Output
States
Offset Voltage
Change in Magnitude of V
OS
Between Complementary Output
States
Output High Voltage
Output Low Voltage
Differential Output Short-Circuit
Current
Output Short-Circuit Current
Output High-Impedance Current
Power-Off Output Current
Output Capacitance
INPUTS (IN_, EN,
EN)
High-Level Input Voltage
Low-Level Input Voltage
Input Current
SUPPLY CURRENT
Supply Current
Disabled Supply Current
I
CC
I
CCZ
R
L
= 27Ω, IN_ = V
CC
or 0 for all channels
Disabled
58
3.2
70
5
mA
mA
V
IH
V
IL
I
IN
IN_, EN,
EN
= 0 or V
CC
2.0
GND
-15
V
CC
0.8
15
V
V
µA
SYMBOL
V
OD
∆V
OD
V
OS
∆V
OS
V
OH
V
OL
I
OSD
I
OS
I
OZ
I
OFF
C
OUT
V
OD
= 0
OUT_+ = 0 at IN_ = V
CC
or
OUT_- = 0 at IN_ = 0
Disabled, OUT_+ = 0 or V
CC
, OUT_- = 0
or V
CC
V
CC
= 0 or open, EN =
EN
= IN_ = 0,
OUT_+ = 0 or 3.6V, OUT_- = 0 or 3.6V
Capacitance from OUT_+ or OUT_- to GND
-1
-1
4.3
0.90
Figure 1
Figure 1
Figure 1
Figure 1
1.125
CONDITIONS
MIN
250
TYP
371
1
1.29
5
1.465
1.085
20
-20
1
1
MAX
450
25
1.375
25
1.6
UNITS
mV
mV
V
mV
V
V
mA
mA
µA
µA
pF
BLVDS OUTPUTS (OUT_+, OUT_-)
2
_______________________________________________________________________________________
Quad Bus LVDS Driver with
Flow-Through Pinout
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, R
L
= 27Ω ±1%, C
L
= 15pF, EN = high,
EN
= low, T
A
= -40°C to +85°C, unless otherwise noted. Typical values
are at V
CC
= +3.3V, T
A
= +25°C.) (Notes 3, 4, 5)
PARAMETER
Differential Propagation Delay
High to Low
Differential Propagation Delay
Low to High
Differential Pulse Skew (Note 6)
Differential Channel-to-Channel
Skew (Note 7)
Differential Part-to-Part Skew
(Note 8)
Differential Part-to-Part Skew
(Note 9)
Rise Time
Fall Time
Disable Time High to Z
Disable Time Low to Z
Enable Time Z to High
Enable Time Z to Low
Maximum Operating Frequency
(Note 10)
SYMBOL
t
PHLD
t
PLHD
t
SKD1
t
SKD2
t
SKD3
t
SKD4
t
TLH
t
THL
t
PHZ
t
PLZ
t
PZH
t
PZL
f
MAX
CONDITIONS
Figures 2 and 3
Figures 2 and 3
Figures 2 and 3
Figures 2 and 3
Figures 2 and 3
Figures 2 and 3
Figures 2 and 3
Figures 2 and 3
Figures 4 and 5
Figures 4 and 5
Figures 4 and 5
Figures 4 and 5
Figure 2
100
MAX9129EGE
MAX9129EUE
MAX9129EGE
MAX9129EUE
0.60
0.60
0.60
0.60
1.19
1.09
1.12
1.02
MIN
1.0
1.0
TYP
1.98
1.92
MAX
3.0
3.0
300
450
1.2
2.0
1.55
1.40
1.55
1.40
8
8
10
10
UNITS
ns
ns
ps
ps
ns
ns
ns
ns
ns
ns
ns
ns
MHz
MAX9129
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
∆V
OD
.
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, V
OH
= V
CC
, f = 100MHz, 50% duty cycle, R
O
= 50Ω, t
R
= t
F
= 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 V
CC
and 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, V
OH
= V
CC
, f = 100MHz, 50% duty cycle, R
O
= 50Ω, t
R
= t
F
= 1ns (10% to 90%).
MAX9129 output criteria: duty cycle = 45% to 55%, V
OD
≥
250mV, all channels switching.
_______________________________________________________________________________________
3
Quad Bus LVDS Driver with
Flow-Through Pinout
MAX9129
Typical Operating Characteristics
(MAX9129EUE (TSSOP package), V
CC
= +3.3V, R
L
= 27Ω, C
L
= 15pF, T
A
= +25°C, unless otherwise noted.) (Note 5)
OUTPUT LOW VOLTAGE
vs. SUPPLY VOLTAGE
MAX9129 toc02
MAX9129 toc01
OUTPUT HIGH VOLTAGE
vs. SUPPLY VOLTAGE
1.48
1.12
OUTPUT SHORT CURRENT (I
OS
)
vs. SUPPLY VOLTAGE
MAX9129 toc03
-14.12
OUTPUT SHORT CURRENT (mA)
OUTPUT HIGH VOLTAGE (V)
OUTPUT LOW VOLTAGE (V)
1.47
1.10
-14.11
1.46
1.08
-14.10
1.45
1.06
-14.09
1.44
3.0
3.3
SUPPLY VOLTAGE (V)
3.6
1.04
3.0
3.3
SUPPLY VOLTAGE (V)
3.6
-14.08
3.0
3.3
SUPPLY VOLTAGE (V)
3.6
OUTPUT HIGH-IMPEDANCE CURRENT
vs. SUPPLY VOLTAGE
MAX9129 toc04
DIFFERENTIAL OUTPUT VOLTAGE vs.
SUPPLY VOLTAGE
DIFFERENTIAL OUTPUT VOLTAGE (mV)
MAX9129 toc05
DIFFERENTIAL OUTPUT VOLTAGE
vs. LOAD RESISTANCE
MAX9129 toc06
430
OUTPUT HIGH-IMPEDANCE CURRENT (pA)
V
OUT_
= V
CC
OR 0
428
372.0
1.750
DIFFERENTIAL OUTPUT VOLTAGE (V)
1.500
1.250
1.000
0.750
0.500
0.250
0
371.5
426
371.0
424
422
370.5
420
3.0
3.3
SUPPLY VOLTAGE (V)
3.6
370.0
3.0
3.3
SUPPLY VOLTAGE (V)
3.6
10
30
50
70
90
110
130
150
LOAD RESISTANCE (Ω)
OUTPUT OFFSET VOLTAGE
vs. SUPPLY VOLTAGE
MAX9129 toc07
SUPPLY CURRENT
vs. FREQUENCY
MAX9129 toc08
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX9129 toc09
1.305
1.300
OUTPUT OFFSET VOLTAGE (V)
1.295
1.290
1.285
1.280
1.275
1.270
1.265
3.0
3.3
SUPPLY VOLTAGE (V)
65
57.7
63
SUPPLY CURRENT (mA)
57.5
SUPPLY CURRENT (mA)
61
57.3
59
57.1
57
56.9
55
3.6
0
1
100
FREQUENCY (MHz)
10
1000
56.7
3.0
3.3
SUPPLY VOLTAGE (V)
3.6
4
_______________________________________________________________________________________
Quad Bus LVDS Driver with
Flow-Through Pinout
Typical Operating Characteristics (continued)
(MAX9129EUE (TSSOP package), V
CC
= +3.3V, R
L
= 27Ω, C
L
= 15pF, T
A
= +25°C, unless otherwise noted.) (Note 5)
SUPPLY CURRENT
vs. TEMPERATURE
MAX9129 toc10
MAX9129
DIFFERENTIAL PROPAGAION DELAY
vs. SUPPLY VOLTAGE
MAX9129 toc11
DIFFERENTIAL PROPAGATION DELAY
vs. TEMPERATURE
DIFFERENTIAL PROPAGATION DELAY (ns)
MAX9129 toc12
60
2.10
DIFFERENTIAL PROPAGATION DELAY (ns)
2.05
t
PHLD
2.00
1.95
1.90
1.85
1.80
2.20
2.10
2.00
1.90
1.80
1.70
1.60
t
PLHD
59
SUPPLY CURRENT (mA)
t
PHLD
58
57
t
PLHD
56
55
-40
-15
10
35
60
85
TEMPERATURE (°C)
3.0
3.3
SUPPLY VOLTAGE (V)
3.6
-40
-15
10
35
60
85
TEMPERATURE (°C)
DIFFERENTIAL SKEW
vs. SUPPLY VOLTAGE
MAX9129 toc13
DIFFERENTIAL SKEW
vs. TEMPERATURE
MAX9129 toc14
TRANSITION TIME
vs. SUPPLY VOLTAGE
20% TO 80%
1.2
TRANSITION TIME (ns)
t
TLH
MAX9129 toc15
70
60
DIFFERENTIAL SKEW (ps)
50
40
30
20
10
0
3.0
3.3
SUPPLY VOLTAGE (V)
100
1.3
80
DIFFERENTIAL SKEW (ps)
60
1.1
40
1.0
t
THL
0.9
20
0
3.6
-40
-15
10
35
60
85
TEMPERATURE (°C)
0.8
3.0
3.3
SUPPLY VOLTAGE (V)
3.6
TRANSITION TIME
vs. TEMPERATURE
20% TO 80%
1.200
1.150
TRANSITION TIME (ns)
1.100
1.050
1.000
0.950
0.900
0.850
0.800
-40
-15
10
35
60
85
TEMPERATURE (°C)
t
THL
t
TLH
MAX9129 toc16
1.250
_______________________________________________________________________________________
5
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