19-2287; Rev 0; 1/02
Quad Bus LVDS Transceiver
General Description
The MAX9157 is a quad bus LVDS (BLVDS) transceiver
for heavily loaded, half-duplex multipoint buses. Small
32-pin QFN and TQFP packages and flow-through
pinouts allow the transceiver to be placed near the con-
nector for the shortest possible stub length. The
MAX9157 drives LVDS levels into a 27Ω load (double
terminated, heavily loaded LVDS bus) at up to
200Mbps. An input fail-safe circuit ensures the receiver
output is high when the differential inputs are open, or
undriven and shorted, or undriven and terminated. The
MAX9157 differential inputs feature 52mV hysteresis for
greater immunity to bus noise and reflections. The
MAX9157 operates from a single 3.3V supply, consum-
ing 80.9mA supply current with drivers enabled, and
22.7mA with drivers disabled.
The MAX9157’s high-impedance I/Os (except for
receiver outputs) when V
CC
= 0 or open, combined
with glitch-free power-up and power-down, allow hot
swapping of cards in multicard bus systems; 7.2pF
(max) BLVDS I/O capacitances minimize bus loading.
The MAX9157 is offered in 5mm
✕
5mm 32-pin QFN and
TQFP packages. The MAX9157 is fully specified for the
-40°C to +85°C extended temperature range. Refer to
the MAX9129 data sheet for a quad BLVDS driver, ideal
for dual multipoint full-duplex buses.
o
52mV LVDS Input Hysteresis
o
1ns (min) Transition Time (0% to 100%) Minimizes
Reflections
o
Guaranteed 7.2pF (max) Bus Load Capacitance
o
Glitch-Free Power-Up and Power-Down
o
Hot-Swappable, High-Impedance I/O with V
CC
= 0
or Open
o
Guaranteed 200Mbps Driver Data Rate
o
Fail-Safe Circuit
o
Flow-Through Pinout
Features
o
32-TQFP and Space-Saving 32-QFN Packages
MAX9157
Ordering Information
PART
MAX9157EGJ
MAX9157EHJ
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
32 QFN (5mm
✕
5mm)
32 TQFP (5mm
✕
5mm)
Applications
Add/Drop Muxes
Digital Cross-Connects
Network
Switches/Routers
Cellular Phone Base
Stations
DSLAMs
Multipoint Buses
Pin Configurations appear at end of data sheet.
Functional Diagram appears at end of data sheet.
Typical Operating Circuit
MAX9157
CARD 1
MAX9157
CARD 15
MAX9157
CARD 16
1in CARD
SPACING
Rt = 54Ω
Rt = 54Ω
________________________________________________________________
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 Transceiver
MAX9157
ABSOLUTE MAXIMUM RATINGS
V
CC
, AV
CC
to GND................................................-0.3V to +4.0V
DO_+/RIN_+, DO_-/RIN_-, to GND .......................-0.3V to +4.0V
DIN_, DE_,
RE_
to GND.........................................-0.3V to +4.0V
RO_ to GND................................................-0.3V to (V
CC
+ 0.3V)
AGND to GND .......................................................-0.3V to +0.3V
Short-Circuit Duration (DO_+/RIN_+, DO_-/RIN_-) ....Continuous
Continuous Power Dissipation (T
A
= +70°C)
MAX9157EGJ (derate 21.2mW/°C above +70°C) .....1702mW
MAX9157EHJ (derate 11.1mW/°C above +70°C).........889mW
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 (DO_+/RIN_+, DO_-/RIN_-).............±4kV
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%, differential input voltage |V
ID
| = 0.1V to V
CC
, input common-mode voltage V
CM
= 0.05V to 2.4V,
input voltage range = 0 to V
CC
, DE_ = high,
RE_
= low, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
=
3.3V, |V
ID
| = 0.2V, V
CM
= 1.2V, and T
A
= +25°C.) (Notes 1 and 2)
PARAMETER
BLVDS (DO_+/RIN_+, DO_-/RIN_-)
Differential Input High Threshold
Differential Input Low Threshold
Threshold Hysteresis (Note 3)
V
TH
V
TL
V
HYST
DE_ = low
DE_ = low
DE_ = low
T
A
= +25°C, V
CC
= 3.3V,
V
CM
= 1.2V
Full operating range
Input Current
Input Resistance
Power-Off Input Current
Differential Output Voltage
Change in Magnitude of VOD for
Complementary Output States
Offset Voltage
Change in Magnitude of VOS for
Complementary Output States
Output High Voltage
Output Low Voltage
I
IN+
, I
IN-
R
IN1
R
IN2
I
INO+
,
I
INO-
V
OD
∆V
OD
V
OS
∆V
OS
V
OH
V
OL
0.1V
≤V
ID
≤
0.6V, DE_ = low
0.6V
<
VID
≤
1.2V, DE_ = low
V
CC
= 3.6V, 0 or open, Figure 1
V
CC
= 3.6V, 0 or open, Figure 1
0.1V
≤
VID
≤
0.6V, V
CC
= 0 or open
0.6V
<
VID
≤
1.2V, V
CC
= 0 or open
Figure 2
Figure 2
Figure 2
Figure 2
Figure 2
Figure 2
DIN_ = high, DO_+/RIN_+ = 0 or
V
CC
, DO_-/RIN_- = 0 or V
CC
DIN_ = low, DO_-/RIN_- = 0 or
V
CC
, DO_+/RIN_+ = 0 or V
CC
0.9
-30
-30
1.185
-100
12
9
-15
-20
53
148
-15
-20
250
±0.9
±1.8
405
1
1.302
3.3
1.505
1.099
-14.8
-14.8
30
mA
30
15
20
460
25
1.435
25
1.6
26
-26
26
26
±1.8
±2.5
43
78
15
20
µA
µA
kΩ
kΩ
µA
µA
mV
mV
V
mV
V
V
100
mV
mV
mV
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Output Short-Circuit Current
I
OS
2
_______________________________________________________________________________________
Quad Bus LVDS Transceiver
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3.0V to 3.6V, R
L
= 27Ω ±1%, differential input voltage |V
ID
| = 0.1V to V
CC
, input common-mode voltage V
CM
= 0.05V to 2.4V,
input voltage range = 0 to V
CC
, DE_ = high,
RE_
= low, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
=
3.3V, |V
ID
| = 0.2V, V
CM
= 1.2V, and T
A
= +25°C.) (Notes 1 and 2)
PARAMETER
Differential Output Short-Circuit
Current (Note 3)
Capacitance at Bus Pins
(Note 3)
LVCMOS/LVTTL OUTPUTS (RO_)
Open, undriven short, or
undriven 27Ω parallel
termination
VID = 100mV
Output Low Voltage
Dynamic Output Current
Output Short-Circuit Current
(Note 4)
Output High-Impedance Current
Capacitance at Receiver Output
(Note 3)
Input High Voltage
Input Low Voltage
Input Current
Power-Off Input Current
SUPPLY
Supply Current Drivers and
Receivers Enabled
Supply Current Drivers Enabled
and Receivers Disabled
Supply Current Drivers Disabled
and Receivers Enabled
Supply Current Drivers Disabled
and Receivers Disabled
I
CC
I
CCD
I
CCR
I
CCZ
DE_ = high, RE_ = low, R
L
= 27Ω
DE_ = high, RE_ = high, R
L
= 27Ω
DE_ = low, RE_ = low
DE_ = low, RE_ = high
80.9
80.9
22.7
22.7
95
95
30
30
mA
mA
mA
mA
V
OL
I
OD
I
OS
I
OZ
C
OUTPUT
I
OL
= 4.0mA, V
ID
= -100mV, DE_ = low
VID = 100mV, V
RO
_ = V
CC
- 1.0V, DE_ = low
VID = -100mV, V
RO
_ = 1.0V, DE_ = low
VID = 100mV, V
RO
_ = 0, DE_ = low
RE_ = high, V
RO
= 0 or V
CC
Capacitance from RO_ to GND, V
CC
= 3.6V
or 0
2.0
GND
V
DE
_
, V
RE
_, V
DIN
_ = high or low
V
DE
_
, V
RE
_, V
DIN
_ = 3.6V or 0, V
CC
= 0
or open
-20
-20
1.825
1.315
±9.2
±2.4
-10
-15
12
V
CC
-
0.3
V
CC
-
0.3
V
CC
-
0.172
V
CC
-
0.172
0.179
-22.7
19.9
-52
0.1
-130
+10
4.5
0.25
V
mA
mA
mA
µA
pF
SYMBOL
I
OSD
C
OUTPUT
CONDITIONS
DIN_ = high or low, V
OD
= 0
Capacitance from DO_+/RIN_+ or
DO_-/RIN_- to GND, V
CC
= 3.6V or 0
MIN
TYP
14.8
MAX
30
7.2
UNITS
mA
pF
MAX9157
Output High Voltage
V
OH
I
OH
= -4.0mA,
DE_ = low
V
LVCMOS/LVTTL INPUTS (DIN, DE, RE)
V
IH
V
IL
I
IN
I
INO
V
CC
0.8
20
20
V
V
µA
µA
_______________________________________________________________________________________
3
Quad Bus LVDS Transceiver
MAX9157
AC ELECTRICAL CHARACTERISTICS
(V
CC
= 3.0V to 3.6V, R
L
= 27Ω ±1%, differential input voltage |V
ID
| = 0.2V to V
CC
, input frequency to LVDS inputs = 85MHz, input fre-
quency to LVCMOS/LVTTL inputs = 100MHz, LVCMOS/LVTTL inputs = 0 to 3V with 2ns (10% to 90%) transition times. Differential input
voltage transition time = 1ns (20% to 80%). Input common-mode voltage V
CM
= 1.2V to 1.8V, DE_ = high,
RE_
= low, T
A
= -40°C to
+85°C, unless otherwise noted. Typical values are at V
CC
= 3.3V, |V
ID
| = 0.2V, V
CM
= 1.2V, and T
A
= +25°C.) (Notes 3 and 5)
PARAMETER
DRIVER
Differential Propagation Delay
High to Low
Differential Propagation Delay
Low to High
Differential Skew | t
PHLD
- t
PLHD
|
(Note 6)
Channel-to-Channel Skew
(Note 7)
Chip-to-Chip Skew (Note 8)
Chip-to-Chip 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)
RECEIVER
Differential Propagation Delay
High to Low
Differential Propagation Delay
Low to High
Differential Skew | tPHLD -
tPLHD | (Note 6)
Channel-to-Channel Skew
(Note 7)
Chip-to-Chip Skew (Note 8)
Chip-to-Chip Skew (Note 9)
Rise Time
t
PHLD
t
PLHD
t
SKD1
t
CCSK
t
SKD2
t
SKD3
t
TLH
DE_ = low, Figures 7, 8;
C
L
=15pF
DE_ = low, Figures 7, 8;
C
L
=15pF
MAX9157EGJ
MAX9157EHJ
MAX9157EGJ
MAX9157EHJ
1.8
1.8
1.8
1.8
2.58
2.61
2.49
2.52
90
131
0.7
0.7
0.5
1.1
4.1
4.1
4.1
4.1
450
580
1.7
1.7
1.6
ns
ns
ps
ps
ns
ns
ns
t
PHLD
t
PLHD
t
SKD1
t
CCSK
t
SKD2
T
SKD3
t
TLH
t
THL
t
PHZ
t
PLZ
t
PZH
t
PZL
f
MAX
RE_ = high, C
L
= 10pF,
Figures 3, 4
RE_ = high, C
L
= 10pF,
Figures 3, 4
MAX9157EGJ
MAX9157EHJ
MAX9157EGJ
MAX9157EHJ
1.2
1.1
1.2
1.1
1.96
1.87
1.94
1.84
33
58
0.38
0.6
0.6
0.6
0.6
1.13
1.07
1.16
1.11
6.79
6.79
3.16
3.48
4.67
4.71
4.36
4.39
100
2.5
2.4
2.5
2.4
160
300
0.8
1.3
1.4
1.4
1.4
1.4
8
8
8
8
7
7
7
7
ns
ns
ps
ps
ns
ns
ns
ns
ns
ns
ns
ns
MHz
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RE_ = high, C
L
= 10pF, Figures 3, 4
RE_ = high, C
L
= 10pF, Figures 3, 4
RE_ = high, C
L
= 10pF, Figures 3, 4
RE_ = high, C
L
= 10pF, Figures 3, 4
RE_ = high, C
L
= 10pF,
Figures 3, 4
RE_ = high, C
L
= 10pF,
Figures 3, 4
RE_ = high, C
L
= 10pF,
Figures 5, 6
RE_ = high, C
L
= 10pF,
Figures 5, 6
RE_ = high, C
L
= 10pF,
Figures 5, 6
RE_ = high, C
L
= 10pF,
Figures 5, 6
MAX9157EGJ
MAX9157EHJ
MAX9157EGJ
MAX9157EHJ
MAX9157EGJ
MAX9157EHJ
MAX9157EGJ
MAX9157EHJ
MAX9157EGJ
MAX9157EHJ
MAX9157EGJ
MAX9157EHJ
RE_ = high, C
L
= 10pF, Figures 5, 6
DE_ = low, Figures 7, 8; C
L
= 15pF
DE_ = low, Figures 7, 8; C
L
= 15pF
DE_ = low, Figures 7, 8; C
L
=15pF
DE_ = low, Figures 7, 8; C
L
=15pF
DE_ = low, Figures 7, 8; C
L
= 15pF
4
_______________________________________________________________________________________
Quad Bus LVDS Transceiver
AC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 3.0V to 3.6V, R
L
= 27Ω ±1%, differential input voltage |V
ID
| = 0.2V to V
CC
, input frequency to LVDS inputs = 85MHz, input fre-
quency to LVCMOS/LVTTL inputs = 100MHz, LVCMOS/LVTTL inputs = 0 to 3V with 2ns (10% to 90%) transition times. Differential input
voltage transition time = 1ns (20% to 80%). Input common-mode voltage V
CM
= 1.2V to 1.8V, DE_ = high,
RE_
= low, T
A
= -40°C to
+85°C, unless otherwise noted. Typical values are at V
CC
= 3.3V, |V
ID
| = 0.2V, V
CM
= 1.2V, and T
A
= +25°C.) (Notes 3 and 5)
PARAMETER
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
THL
t
PHZ
t
PLZ
t
PZH
t
PZL
f
MAX
CONDITIONS
DE_ = low, Figures 7, 8; C
L
= 15pF
DE_ = low, R
L
= 500Ω, C
L
= 15pF, Figures 9, 10
DE_ = low, R
L
= 500Ω, C
L
= 15pF, Figures 9, 10
DE_ = low, R
L
= 500Ω, C
L
= 15pF, Figures 9, 10
DE_ = low, R
L
= 500Ω, C
L
= 15pF, Figures 9, 10
DE_ = low, C
L
= 15pF
MAX9157EGJ
MAX9157EHJ
MAX9157EGJ
MAX9157EHJ
MAX9157EGJ
MAX9157EHJ
MAX9157EGJ
MAX9157EHJ
85
MIN
0.7
TYP
1.2
6.74
6.82
6.49
6.79
4.67
4.57
5.43
4.71
MAX
1.8
8
8
8
8
7
7
7
7
UNITS
ns
ns
ns
ns
ns
MHz
MAX9157
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
, V
TL
, V
ID
, V
HYST
, V
OD
, and
∆V
OD
.
Note 2:
Maximum and minimum limits over temperature are guaranteed by design and characterization. Devices are production
tested at T
A
= +25°C.
Note 3:
Guaranteed by design and characterization.
Note 4:
Short only one output at a time. Do not exceed the absolute maximum junction temperature specification.
Note 5:
C
L
includes scope probe and test jig capacitance.
Note 6:
t
SKD1
is the magnitude difference of differential propagation delays in a channel. t
SKD1
= | t
PHLD
- t
PLHD
|.
Note 7:
t
CCSK
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 8:
t
SKD2
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 9:
t
SKD3
is the magnitude difference of any differential propagation delays between parts operating over rated conditions.
Note 10:
Meets data sheet specifications while operating at minimum f
MAX
rating.
Typical Operating Characteristics
(V
CC
= 3.3V, R
L
= 27Ω, driver C
L
= 10pF, receiver C
L
= 15pF, |V
ID
| = 200mV, V
CM
= 1.2V, f
IN
= 20MHz, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. FREQUENCY
MAX9157 toc01
DIFFERENTIAL OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
MAX9157 toc02
DIFFERENTIAL OUTPUT VOLTAGE
vs. OUTPUT LOAD
DIFFERENTIAL OUTPUT VOLTAGE (V)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
MAX9157 toc03
105
100
SUPPLY CURRENT (mA)
95
90
DIFFERENTIAL OUTPUT VOLTAGE (V)
FOUR CHANNELS
DRIVEN
0.405
2.0
0.404
V
CC
= 3.6V
0.403
V
CC
= 3.3V
85
80
75
0.01
0.1
1
10
100
1000
FREQUENCY (MHz)
V
CC
= 3.0V
0.402
0.401
0.400
3.0
3.1
3.2
3.3
3.4
3.5
3.6
SUPPLY VOLTAGE (V)
0
15
45
75
105
135
OUTPUT LOAD (Ω)
_______________________________________________________________________________________
5
