MAX9391EHJ+ [MAXIM]
Anything-to-LVDS Dual 2 x 2 Crosspoint Switches; 任何对LVDS双路，2 x 2交叉点开关
| 型号： | MAX9391EHJ+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Anything-to-LVDS Dual 2 x 2 Crosspoint Switches |
| 文件： | 总14页 (文件大小：180K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2829; Rev 2; 5/07
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
General Description
Features
The MAX9390/MAX9391 dual 2 x 2 crosspoint switches
perform high-speed, low-power, and low-noise signal
distribution. The MAX9390/MAX9391 multiplex one of two
differential input pairs to either or both low-voltage differ-
ential signaling (LVDS) outputs for each channel.
Independent enable inputs turn on or turn off each differ-
ential output pair.
♦ 1.5GHz Operation with 250mV Differential Output
Swing
♦ 2ps
(max) Random Jitter
(RMS)
♦ AC Specifications Guaranteed for 150mV
Differential Input
♦ Signal Inputs Accept Any Differential Signaling
Standard
Four LVCMOS/LVTTL logic inputs (two per channel) con-
trol the internal connections between inputs and outputs.
This flexibility allows for the following configurations: 2 x 2
crosspoint switch, 2:1 mux, 1:2 splitter, or dual repeater.
This makes the MAX9390/MAX9391 ideal for protection
switching in fault-tolerant systems, loopback switching for
diagnostics, fanout buffering for clock/data distribution,
and signal regeneration.
♦ LVDS Outputs for Clock or High-Speed Data
♦ High-Level Input Fail-Safe Detection (MAX9390)
♦ Low-Level Input Fail-Safe Detection (MAX9391)
♦ 3.0V to 3.6V Supply Voltage Range
♦ LVCMOS/LVTTL Logic Inputs Control Signal
Routing
Fail-safe circuitry forces the outputs to a differential low
condition for undriven inputs or when the common-
mode voltage exceeds the specified range. The
MAX9390 provides high-level input fail-safe detection
for LVDS, HSTL, and other GND-referenced differential
inputs. The MAX9391 provides low-level input fail-safe
Ordering Information
PIN-
PACKAGE
PKG
CODE
PART
TEMP RANGE
MAX9390EHJ
MAX9390EHJ+
MAX9391EHJ
MAX9391EHJ+
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
32 TQFP
32 TQFP
32 TQFP
32 TQFP
H32-1
H32-1
H32-1
H32-1
detection for LVPECL, CML, and other V -referenced
CC
differential inputs.
Ultra-low 82ps
(max) pseudorandom bit sequence
(P-P)
(PRBS) jitter ensures reliable communications in high-
speed links that are highly sensitive to timing error,
especially those incorporating clock-and-data recovery,
or serializers and deserializers. The high-speed switch-
ing performance guarantees 1.5GHz operation and less
than 65ps (max) skew between channels.
+Denotes a lead-free package.
Pin Configurations
TOP VIEW
LVDS inputs and outputs are compatible with the
TIA/EIA-644 LVDS standard. The LVDS outputs drive
100Ω loads. The MAX9390/MAX9391 are offered in a
32-pin TQFP package and operate over the extended
temperature range (-40°C to +85°C).
32 31 30 29 28 27 26 25
+
ENB1 1
24 V
CC
Also refer to the MAX9392/MAX9393 with flow-through
pinout.
OUTA0
23
OUTB1
OUTB1
2
3
22 OUTA0
21 ENA0
20 GND
Applications
GND 4
MAX9390
MAX9391
High-Speed Telecom/Datacom Equipment
Central-Office Backplane Clock Distribution
DSLAM
ENB0
OUTB0
OUTB0
5
6
7
8
19 OUTA1
18 OUTA1
17 ENA1
Protection Switching
V
CC
Fault-Tolerant Systems
9
10 11 12 13 14 15 16
Functional Diagram and Typical Operating Circuit appear at
end of data sheet.
TQFP
________________________________________________________________ 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.
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
ABSOLUTE MAXIMUM RATINGS
CC
IN_ _, IN_ _, OUT_ _, OUT_ _, EN_ _,
_SEL_ to GND.........................................-0.3V to (V
V
to GND...........................................................-0.3V to +4.1V
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
ESD Protection (Human Body Model)
+ 0.3V)
CC
IN_ _ to IN_ _.......................................................................... 3V
Short-Circuit Duration (OUT_ _, OUT_ _) ...................Continuous
Continuous Power Dissipation (T = +70°C)
A
(IN_ _, IN_ _, OUT_ _, OUT_ _, EN_ _, SEL_ _) ................ 2kV
Soldering Temperature (10s)...........................................+300°C
32-Pin QFP (derate 13.1mW/°C
above +70°C).............................................................1047mW
Junction-to-Ambient Thermal Resistance in Still Air
32-Pin TQFP............................................................+76.4°C/W
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 = 3.0V to 3.6V, R = 100Ω 1%, EN_ _ = V , V
= 0.05V to (V - 0.6V) (MAX9390), V
= 0.6V to (V - 0.05V) (MAX9391) T =
CC
L
CC CM
CC
CM CC A
-40°C to +85°C, unless otherwise noted. Typical values are at V = 3.3V, |V | = 0.2V, V
= 1.2V, T = +25°C.) (Notes 1, 2, and 3)
CC
ID
CM
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LVCMOS/LVTTL INPUTS (EN_ _, _SEL_)
Input High Voltage
V
2.0
0
V
V
IH
CC
Input Low Voltage
V
0.8
20
10
V
IL
Input High Current
I
V
V
= 2.0V to V
= 0 to 0.8V
0
µA
µA
IH
IN
IN
CC
Input Low Current
I
0
IL
IN_ _
DIFFERENTIAL INPUTS (IN_ _,
)
Differential Input Voltage
V
V
> 0 and V
< V , Figure 1
0.1
0.05
0.6
3.0
V
V
ID
ILD
IHD
CC
MAX9390
MAX9391
MAX9390
MAX9391
V
- 0.6
CC
Input Common-Mode Range
Input Current
V
CM
V
- 0.05
+10
CC
|V | < 3.0V
ID
-75
-10
I
I
,
IN_ _
µA
IN_ _
|V | < 3.0V
ID
+100
450
50
OUT__
LVDS OUTPUTS (OUT_ _,
)
Differential Output Voltage
V
R = 100Ω, Figure 2
250
350
1.0
mV
mV
V
OD
L
Change in Magnitude of V
Between Complementary Output
States
OD
ΔV
Figure 2
Figure 2
Figure 2
OD
OS
Offset Common-Mode Voltage
V
1.125
1.25
1.0
1.375
50
Change in Magnitude of V
Between Complementary Output
States
OS
ΔV
mV
OS
2
_______________________________________________________________________________________
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
DC ELECTRICAL CHARACTERISTICS (continued)
(V = 3.0V to 3.6V, R = 100Ω 1%, EN_ _ = V , V
= 0.05V to (V - 0.6V) (MAX9390), V
= 0.6V to (V - 0.05V) (MAX9391) T =
CC
L
CC CM
CC
CM CC A
-40°C to +85°C, unless otherwise noted. Typical values are at V = 3.3V, |V | = 0.2V, V
= 1.2V, T = +25°C.) (Notes 1, 2, and 3)
CC
ID
CM
A
PARAMETER
SYMBOL
|I
CONDITIONS
MIN
TYP
30
MAX
40
UNITS
V
V
or V
= 0
= 0
OUT_ _
OUT_ _
OUT_ _
Output Short-Circuit Current
(Either Output Shorted to GND)
V
= 100mV
ID
|
mA
OS
(Note 4)
= V
= V
18
24
OUT_ _
Output Short-Circuit Current
(Outputs Shorted Together)
V
= 100mV, V
ID OUT_ _
OUT_ _
|I
OSB
|
5.0
12
mA
(Note 4)
SUPPLY CURRENT
R = 100Ω, EN_ _ = V
68
68
98
98
L
CC
Supply Current
I
CC
mA
R = 100Ω, EN_ _ = V , switching at
L
CC
670MHz (1.34Gbps)
AC ELECTRICAL CHARACTERISTICS
(V
= 3.0V to 3.6V, f < 1.34GHz, t
= t
= 125ps, R = 100Ω 1%, |V | > 150mV, V
= 0.075V to (V
- 0.6V) (MAX9390
CC
CC
IN
R_IN
F_IN
L
ID
CM
only), V
= 0.6V to (V
- 0.075V) (MAX9391 only), EN_ _ = V , T = -40°C to +85°C, unless otherwise noted. Typical values are
CM
CC CC A
at V
= 3.3V, |V | = 0.2V, V
= 1.2V, f = 1.34GHz, T = +25°C.) (Note 5)
CC
ID
CM
IN
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
_SEL_ to Switched Output
t
Figure 3
Figure 4
1.1
ns
SWITCH
Disable, Time to Differential
Output Low
t
1.7
1.7
ns
ns
PHD
Enable, Time to Differential
Output High
t
Figure 4
PDH
MAX
Switching Frequency
f
V
> 250mV
1.50
294
286
2.20
409
402
GHz
ps
OD
Low-to-High Propagation Delay
High-to-Low Propagation Delay
t
Figures 1, 5
Figures 1, 5
565
530
PLH
PHL
t
ps
Pulse Skew |t
- t
|
t
Figures 1, 5 (Note 6)
Figures 5, 6 (Note 7)
7
97
65
ps
ps
ps
PLH PHL
SKEW
Output-to-Output Skew
t
10
CCS
Output Low-to-High Transition
Time (20% to 80%)
t
R
Figures 1, 5; f = 100MHz
112
112
153
185
IN
Output High-to-Low Transition
Time (80% to 20%)
t
F
Figures 1, 5; f = 100MHz
153
185
ps
IN
Added Random Jitter
t
f
= 1.34GHz, clock pattern (Note 8)
2
ps
(RMS)
RJ
IN_ _
Added Deterministic Jitter
t
1.34Gbps, 223 - 1 PRBS (Note 8)
55
82
ps
(P-P)
DJ
Note 1: Measurements obtained with the device in thermal equilibrium. All voltages referenced to GND except V , V , and ΔV
.
OD
ID OD
Note 2: Current into the device defined as positive. Current out of the device defined as negative.
Note 3: DC parameters tested at T = +25°C and guaranteed by design and characterization for T = -40°C to +85°C.
A
A
Note 4: Current through either output.
Note 5: Guaranteed by design and characterization. Limits set at 6 sigma.
Note 6: t
is the magnitude difference of differential propagation delays for the same output over same conditions. t
=
SKEW
SKEW
|t
- t
|.
PHL PLH
Note 7: Measured between outputs of the same device at the signal crossing points for a same-edge transition, under the same
conditions.
Note 8: Device jitter added to the differential input signal.
_______________________________________________________________________________________
3
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
Typical Operating Characteristics
(V
= 3.3V, |V | = 0.2V, V
= 1.2V, f = 1.34GHz, T = +25°C.)
CC
ID
CM
IN
A
OUTPUT RISE AND FALL TIMES
vs. TEMPERATURE
OUTPUT AMPLITUDE
vs. FREQUENCY
SUPPLY CURRENT
vs. TEMPERATURE
180
400
350
300
250
200
150
100
50
82
f
= 100MHz
IN
78
74
70
170
160
150
140
130
120
t
F
V
= 3.6V
CC
t
R
66
62
58
54
V
= 3.3V
CC
V
= 3V
CC
0
-40
-15
10
35
60
85
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4
FREQUENCY (GHz)
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX9391
DIFFERENTIAL INPUT CURRENT
vs. TEMPERATURE
MAX9390
DIFFERENTIAL INPUT CURRENT
vs. TEMPERATURE
PROPAGATION DELAY
vs. TEMPERATURE
450
440
430
420
410
400
390
380
370
360
350
80
70
60
50
40
30
20
10
0
10
5
0
V
= 3V
IN
V
= 3.2V
IN
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
V
= 0.1V
IN
V
= 0.3V
IN
-10
-40
-15
10
35
60
85
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX9391
DIFFERENTIAL INPUT CURRENT vs. V
MAX9390 INPUT CURRENT vs. V
ILD
IHD
80
70
60
50
40
30
20
10
0
10
5
IN_ _ OR
IN_ _ = GND
IN_ _ OR
IN_ _ = V
V
= 3.6V
CC
CC
0
-5
V
= 3V
CC
-10
-15
-20
-25
-30
-35
-40
-45
-50
V
= 3.6V
CC
V
= 3V
CC
-10
0
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.3 3.6
(V)
0
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.3 3.6
(V)
V
V
ILD
IHD
4
_______________________________________________________________________________________
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
Pin Description
PIN
NAME
FUNCTION
B1 Output Enable. Drive ENB1 high to enable the B1 LVDS outputs. An internal 435kΩ resistor pulls ENB1
low when unconnected.
1
ENB1
B1 LVDS Noninverting Output. Connect a 100Ω termination resistor between OUTB1 and OUTB1 at the
receiver inputs to ensure proper operation.
2
3
OUTB1
OUTB1
GND
B1 LVDS Inverting Output. Connect a 100Ω termination resistor between OUTB1 and OUTB1 at the
receiver inputs to ensure proper operation.
4, 9,
20, 25
Ground
B0 Output Enable. Drive ENB0 high to enable the B0 LVDS outputs. An internal 435kΩ resistor pulls ENB0
low when unconnected.
5
6
7
ENB0
B0 LVDS Noninverting Output. Connect a 100Ω termination resistor between OUTB0 and OUTB0 at the
receiver inputs to ensure proper operation.
OUTB0
OUTB0
B0 LVDS Inverting Output. Connect a 100Ω termination resistor between OUTB0 and OUTB0 at the
receiver inputs to ensure proper operation.
8, 13,
24, 29
Power-Supply Input. Bypass each V
bypass capacitors as close to the device as possible, with the 0.01µF capacitor closest to the device.
to GND with 0. 1µF and 0.01µF ceramic capacitors. Install both
CC
V
CC
LVDS/HSTL (MAX9390) or LVPECL/CML (MAX9391) Inverting Input. An internal 128kΩ resistor to V pulls
CC
10
11
12
14
15
16
INB0
INB0
the input high when unconnected (MAX9390). An internal 68kΩ resistor to GND pulls the input low when
unconnected (MAX9391).
LVDS/HSTL (MAX9390) or LVPECL/CML (MAX9391) Noninverting Input. An internal 128kΩ resistor to V
CC
pulls the input high when unconnected (MAX9390). An internal 68kΩ resistor to GND pulls the input low
when unconnected (MAX9391).
Input Select for B0 Output. Selects the differential input to reproduce at the B0 differential outputs. Connect
BSEL0 to GND or leave open to select the INB0 (INB0) set of inputs. Connect BSEL0 to V
INB1 (INB1) set of inputs. An internal 435kΩ resistor pulls BSEL0 low when unconnected.
to select the
BSEL0
INB1
CC
LVDS/HSTL (MAX9390) or LVPECL/CML (MAX9391) Inverting Input. An internal 128kΩ resistor to V pulls
CC
the input high when unconnected (MAX9390). An internal 68kΩ resistor to GND pulls the input low when
unconnected (MAX9391).
LVDS/HSTL (MAX9390) or LVPECL/CML (MAX9391) Noninverting Input. An internal 128kΩ resistor to V
CC
pulls the input high when unconnected (MAX9390). An internal 68kΩ resistor to GND pulls the input low
when unconnected (MAX9391).
INB1
Input Select for B1 Output. Selects the differential input to reproduce at the B1 differential outputs. Connect
BSEL1
BSEL1 to GND or leave open to select the INB0 (INB0) set of inputs. Connect BSEL1 to V
to select the
CC
INB1 (INB1) set of inputs. An internal 435kΩ resistor pulls BSEL1 low when unconnected.
_______________________________________________________________________________________
5
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
Pin Description (continued)
PIN
NAME
FUNCTION
A1 Output Enable. Drive ENA1 high to enable the A1 LVDS outputs. An internal 435kΩ resistor pulls ENA1
low when unconnected.
17
ENA1
A1 LVDS Inverting Output. Connect a 100Ω termination resistor between OUTA1 and OUTA1 at the
receiver inputs to ensure proper operation.
18
19
21
22
23
OUTA1
OUTA1
ENA0
A1 LVDS Noninverting Output. Connect a 100Ω termination resistor between OUTA1 and OUTA1 at the
receiver inputs to ensure proper operation.
A0 Output Enable. Drive ENA0 high to enable the A0 LVDS outputs. An internal 435kΩ resistor pulls ENA0
low when unconnected.
A0 LVDS Inverting Output. Connect a 100Ω termination resistor between OUTA0 and OUTA0 at the
receiver inputs to ensure proper operation.
OUTA0
OUTA0
A0 LVDS Noninverting Output. Connect a 100Ω termination resistor between OUTA0 and OUTA0 at the
receiver inputs to ensure proper operation.
LVDS/HSTL (MAX9390) or LVPECL/CML (MAX9391) Noninverting Input. An internal 128kΩ resistor to V
CC
26
27
28
30
31
32
INA0
INA0
pulls the input high when unconnected (MAX9390). An internal 68kΩ resistor to GND pulls the input low
when unconnected (MAX9391).
LVDS/HSTL (MAX9390) or LVPECL/CML (MAX9391) Inverting Input. An internal 128kΩ resistor to V pulls
CC
the input high when unconnected (MAX9390). An internal 68kΩ resistor to GND pulls the input low when
unconnected (MAX9391).
Input Select for A0 Output. Selects the differential input to reproduce at the A0 differential outputs. Connect
ASEL0 to GND or leave open to select the INA0 (INA0) set of inputs. Connect ASEL0 to V
INA1 (INA1) set of inputs. An internal 435kΩ resistor pulls ASEL0 low when unconnected.
to select the
ASEL0
INA1
CC
LVDS/HSTL (MAX9390) or LVPECL/CML (MAX9391) Noninverting Input. An internal 128kΩ resistor to V
CC
pulls the input high when unconnected (MAX9390). An internal 68kΩ resistor to GND pulls the input low
when unconnected (MAX9391).
LVDS/HSTL (MAX9390) or LVPECL/CML (MAX9391) Inverting Input. An internal 128kΩ resistor to V pulls
CC
the input high when unconnected (MAX9390). An internal 68kΩ resistor to GND pulls the input low when
unconnected (MAX9391).
INA1
Input Select for A1 Output. Selects the differential input to reproduce at the A1 differential outputs. Connect
ASEL1
ASEL1 to GND or leave open to select the INA0 (INA0) set of inputs. Connect ASEL1 to V
to select the
CC
INA1 (INA1) set of inputs. An internal 435kΩ resistor pulls ASEL1 low when unconnected.
6
_______________________________________________________________________________________
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
V
V
V
IN_ _
IN_ _
IHD
V
t
= 0
V
= 0
ID
ID
V
ILD
OUT_ _
V
OD
OS
t
PHL
1/4 MAX9390/MAX9391
PLH
V
V
OUT_ _
OUT_ _
R /2
L
V
= 0
V
= 0
OD
OD
IN_ _
IN_ _
V
R /2
L
80%
= 0
80%
50%
EN_ _ = HIGH
= V - V
IN_ _
V
ID
IN_ _
OUT_ _
50%
20%
V
V
= 0
OD
OD
20%
ΔV = ⎪V - V *⎪
OD
OD
OS
OD
OS
ΔV = ⎪V - V *⎪
OS
t
t
F
R
V
V
AND V ARE MEASURED WITH V = +100mV
* AND V * ARE MEASURED WITH V = -100mV
OD
OD
OS ID
OS
ID
V
V
= V
- V
IN_ _ IN_ _
ID
= V
- V
OUT_ _
OD
OUT_ _
t
AND t MEASURED FOR ANY COMBINATION OF _SEL0 AND _SEL1.
PHL
PLH
Figure 1. Output Transition Time and Propagation Delay Timing
Diagram
Figure 2. Test Circuit for V and V
OD OS
V
IHD
IN_0
V
V
= 0
= 0
ID
ID
V
ILD
IN_0
V
IHD
IN_1
IN_1
V
ILD
V
V
IH
1.5V
IN_0
1.5V
IL
_SEL_
OUT_ _
OUT_ _
V
OD
= 0
IN_1
IN_0
V
OD
= 0
t
t
SWITCH
SWITCH
EN_0 = EN_1 = HIGH
= V - V
V
ID
IN_ _
IN_ _
Figure 3. Input to Rising/Falling Edge Select and Mux Switch Timing Diagram
_______________________________________________________________________________________
7
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
3V
0
OUT_ _
1.5V
1.5V
V
EN_ _
1/4 MAX9390/MAX9391
C
L
R /2
L
IN_ _
IN_ _
t
t
PHD
PDH
V
V
WHEN V = +100mV
ID
OUT_ _
50%
50%
50%
50%
1.25V
R /2
L
WHEN V = -100mV
OUT_ _
ID
PULSE
GENERATOR
OUT_ _
V
V
WHEN V = -100mV
ID
OUT_ _
C
L
WHEN V = +100mV
50Ω
OUT_ _
ID
t
t
PHD
PDH
R = 100Ω 1%
L
L
C = 1.0pF
V
ID
= V
- V
IN_ _ IN_ _
Figure 4. Output Active-to-Disable and Disable-to-Active Test Circuit and Timing Diagram
_SEL0
IN_0
C
L
0
OUT_0
OUT_0
IN_0
R
L
1
C
L
PULSE
GENERATOR
MAX9390
MAX9391
50Ω
50Ω
C
L
OUT_1
OUT_1
0
1
R
L
IN_1
IN_1
C
L
_SEL1
EN_0 = EN_1 = HIGH
1 CHANNEL SHOWN
R = 100Ω 1%
L
L
C = 1.0pF
Figure 5. Output Transition Time, Propagation Delay, and Output Channel-to-Channel Skew Test Circuit
8
_______________________________________________________________________________________
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
V
V
V
V
OUT_0
OUT_0
OUT_1
OUT_1
IN_0
IN_1
OUT_0
OUT_1
V
= 0
V
= 0
OD
OD
t
t
CCS
CCS
2 x 2 CROSSPOINT
V
OD
= 0
V
= 0
OD
V
= V
- V
OD
OUT_ _ OUT_ _
IN_0
IN_1
t
MEASURED WITH _SEL0 = _SEL1 = HIGH OR LOW
(1:2 SPLITTER CONFIGURATION).
CCS
OUT_0 OR OUT_1
Figure 6. Output Channel-to-Channel Skew
2:1 MUX
Detailed Description
OUT_0
OUT_1
The LVDS interface standard provides a signaling
method for point-to-point communication over a con-
trolled-impedance medium as defined by the ANSI
TIA/EIA-644 standard. LVDS utilizes a lower voltage
swing than other communication standards, achieving
higher data rates with reduced power consumption,
while reducing EMI emissions and system susceptibility
to noise.
IN_0 OR IN_1
1:2 SPLITTER
IN_0
IN_1
OUT_0
OUT_1
The MAX9390/MAX9391 1.5GHz dual 2 x 2 crosspoint
switches optimize high-speed, low-power, point-to-
point interfaces. The MAX9390 accepts LVDS and
HSTL signals, while the MAX9391 accepts LVPECL and
CML signals. Both devices route the input signals to
either or both LVDS outputs.
DUAL REPEATER
When configured as a 1:2 splitter, the outputs repeat
the selected inputs. This configuration creates copies
of signals for protection switching. When configured as
a repeater, the device operates as a two-channel
buffer. Repeating restores signal amplitude, allowing
isolation of media segments or longer media drive.
When configured as a 2:1 mux, select primary or back-
up signals to provide a protection-switched, fault-toler-
ant application.
Figure 7. Programmable Configurations
Select Function
The _SEL_ logic inputs control the input and output sig-
nal connections. Two logic inputs control the signal rout-
ing for each channel. _SEL0 and _SEL1 allow the
devices to be configured as a differential crosspoint
switch, 2:1 mux, dual repeater, or 1:2 splitter (Figure 7).
See Table 1 for mode-selection settings (insert A or B for
the _). Channels A and B possess separate select
inputs, allowing different configurations for each channel.
Input Fail-Safe
The differential inputs of the MAX9390/MAX9391 pos-
sess internal fail-safe protection. Fail-safe circuitry
forces the outputs to a differential low condition for
undriven inputs or when the common-mode voltage
exceeds the specified range. The MAX9390 provides
high-level input fail-safe detection for LVDS, HSTL, and
other GND-referenced differential inputs. The MAX9391
provides low-level input fail-safe detection for LVPECL,
Enable Function
The EN_ _ logic inputs enable and disable each set of
differential outputs. Connect EN_ 0 to V
to enable
CC
the OUT_0/OUT_0 differential output pair. Connect
EN_0 to GND to disable the OUT_0/OUT_0 differential
output pair. The differential output pairs assert to a dif-
ferential low condition when disabled.
CML, and other V -referenced differential inputs.
CC
_______________________________________________________________________________________
9
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
Table 1. Input/Output Function Table
_SEL0
_SEL1
OUT_0 / OUT_0
IN_0 / IN_0
IN_0 / IN_0
IN_1 / IN_1
IN_1 / IN_1
OUT_1 / OUT_1
IN_0 / IN_0
IN_1 / IN_1
IN_0 / IN_0
IN_1 / IN_1
MODE
1:2 splitter
Repeater
Switch
0
0
1
1
0
1
0
1
1:2 splitter
discontinuities. Reduce reflections by maintaining the
50Ω characteristic impedance through connectors and
across cables. Minimize skew by matching the electri-
cal length of the traces.
Applications Information
Differential Inputs
The MAX9390/MAX9391 inputs accept any differential
signaling standard within the specified common-mode
voltage range. The fail-safe feature detects common-
mode input signal levels and generates a differential
output low condition for undriven inputs or when the
common-mode voltage exceeds the specified range.
Output Termination
Terminate LVDS outputs with a 100Ω resistor between
the differential outputs at the receiver inputs. LVDS out-
puts require 100Ω termination for proper operation.
Leave unused inputs unconnected or connect to V
for the MAX9390 or to GND for the MAX9391.
CC
Ensure that the output currents do not exceed the cur-
rent limits specified in the Absolute Maximum Ratings.
Observe the total thermal limits of the MAX9390/
MAX9391 under all operating conditions.
Differential Outputs
The output common-mode voltage is not properly
established if the LVDS output is higher than 0.6V when
the supply voltage is ramping up at power-on. This
condition can occur when an LVDS output drives an
LVDS input on the same chip. To avoid this situation for
the MAX9390/MAX9391, connect a 10kΩ resistor from
the noninverting output (OUT_) to ground, and connect
a 10kΩ resistor from the inverting output (OUT_) to
ground. These pulldown resistors keep the output
below 0.6V when the supply is ramping up (Figure 8).
Cables and Connectors
Use matched differential impedance for transmission
media. Use cables and connectors with matched differ-
ential impedance to minimize impedance discontinu-
ities. Avoid the use of unbalanced cables. Balanced
cables such as twisted pair offer superior signal quality
and tend to generate less EMI due to canceling effects.
Board Layout
Use a four-layer printed circuit (PC) board providing
separate signal, power, and ground planes for high-
Expanding the Number of LVDS Output
Ports
Cascade devices to make larger switches. Consider
the total propagation delay and total jitter when deter-
mining the maximum allowable switch size.
speed signaling applications. Bypass V
to GND as
CC
close to the device as possible. Install termination
resistors as close to receiver inputs as possible. Match
the electrical length of the differential traces to minimize
signal skew.
Power-Supply Bypassing
to GND with high-frequency surface-
Bypass each V
CC
mount ceramic 0.1µF and 0.01µF capacitors in parallel
as close to the device as possible. Install the 0.01µF
capacitor closest to the device.
100Ω DIFFERENTIAL
TRANSMISSION LINE
MAX9390
MAX9391
OUT_
OUT_
Differential Traces
Input and output trace characteristics affect the perfor-
mance of the MAX9390/MAX9391. Connect each input
and output to a 50Ω characteristic impedance trace.
Maintain the distance between differential traces and
eliminate sharp corners to avoid discontinuities in dif-
ferential impedance and maximize common-mode
noise immunity. Minimize the number of vias on the dif-
ferential input and output traces to prevent impedance
100Ω
TERMINATION
RESISTOR
10kΩ
10kΩ
GND
Figure 8. Pulldown Resistor Configuration for LVDS Outputs
10 ______________________________________________________________________________________
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
Typical Operating Circuit
3.0V TO
3.6V
0.1μF
0.01μF
V
CC
Z = 50Ω
0
Z = 50Ω
0
INA0
OUTA0
100Ω
100Ω
MAX9390
MAX9391
OUTA0
OUTA1
Z = 50Ω
Z = 50Ω
0
INA0
0
LVDS
RECEIVER
INA1
INA1
INB0
INB0
INB1
INB1
Z = 50Ω
0
MAX9173
Z = 50Ω
0
OUTA1
OUTB0
Z = 50Ω
0
ENA0
ENA1
ENB0
ENB1
OUTB0
OUTB1
Z = 50Ω
0
Z = 50Ω
0
LVCMOS/LVTTL
LOGIC INPUTS
ASEL0
ASEL1
BSEL0
BSEL1
Z = 50Ω
0
OUTB1
GND GND GND GND
______________________________________________________________________________________ 11
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
Functional Diagram
Chip Information
TRANSISTOR COUNT: 1565
PROCESS: BIPOLAR
INA0
INA0
MAX9390
MAX9391
0
1
OUTA0
OUTA0
ENA0
ASEL0
INA1
INA1
1
0
OUTA1
OUTA1
ENA1
ASEL1
INB0
INB0
0
1
OUTB0
OUTB0
ENB0
BSEL0
INB1
INB1
1
0
OUTB1
OUTB1
ENB1
BSEL1
12 ______________________________________________________________________________________
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, 32L TQFP, 5x5x1.0mm
1
21-0110
B
2
______________________________________________________________________________________ 13
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
PACKAGE OUTLINE, 32L TQFP, 5x5x1.0mm
2
21-0110
B
2
Revision History
Pages changed at Rev 2: 1–4, 6, 8, 10–14
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.
14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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