19-2829; Rev 1; 7/03
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
General Description
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.
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.
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, CML, and other V
CC
-referenced
differential inputs.
Ultra-low 82ps
(
P-P)
(max) pseudorandom bit sequence
(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.
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 and 5mm x 5mm thin QFN package with
exposed paddle and operate over the extended tem-
perature range (-40°C to +85°C).
Also refer to the MAX9392/MAX9393 with flow-through
pinout.
Features
o
1.5GHz Operation with 250mV Differential Output
Swing
o
2ps
(RMS)
(max) Random Jitter
o
AC Specifications Guaranteed for 150mV
Differential Input
o
Signal Inputs Accept Any Differential Signaling
Standard
o
LVDS Outputs for Clock or High-Speed Data
o
High-Level Input Fail-Safe Detection (MAX9390)
o
Low-Level Input Fail-Safe Detection (MAX9391)
o
+3.0V to +3.6V Supply Voltage Range
o
LVCMOS/LVTTL Logic Inputs Control Signal
Routing
MAX9390/MAX9391
Ordering Information
PART
MAX9390EHJ
MAX9390ETJ*
MAX9391EHJ
MAX9391ETJ*
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
32 TQFP
32 Thin QFN
32 TQFP
32 Thin QFN
*Future
product—contact factory for availability.
Pin Configurations
TOP VIEW
ASEL1
ASEL0
INA1
INA1
INA0
INA0
26
GND
25
24 V
CC
23 OUTA0
22 OUTA0
21 ENA0
20 GND
19 OUTA1
18 OUTA1
17 ENA1
9
GND
10
INB0
11
INB0
12
BSEL0
13
V
CC
14
INB1
15
INB1
16
BSEL1
V
CC
32
ENB1 1
OUTB1 2
OUTB1 3
GND 4
ENB0 5
OUTB0 6
OUTB0 7
V
CC
8
31
30
29
28
27
Applications
High-Speed Telecom/Datacom Equipment
Central-Office Backplane Clock Distribution
DSLAM
Protection Switching
Fault-Tolerant Systems
Functional Diagram and Typical Operating Circuit appear at
end of data sheet.
MAX9390
MAX9391
TQFP
Pin Configurations continued at end of data sheet.
1
________________________________________________________________
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.
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
MAX9390/MAX9391
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ...........................................................-0.3V to +4.1V
IN_ _,
IN_ _,
OUT_ _,
OUT_ _,
EN_ _,
_SEL_ to GND.........................................-0.3V to (V
CC
+ 0.3V)
IN_ _ to
IN_ _
..........................................................................±3V
Short-Circuit Duration (OUT_ _,
OUT_ _)
...................Continuous
Continuous Power Dissipation (T
A
= +70°C)
32-Pin QFP (derate 13.1mW/°C
above +70°C).............................................................1047mW
32-Pin 5mm x 5mm Thin QFN (derate 21.3mW/°C
above +70°C).............................................................1702mW
Junction-to-Ambient Thermal Resistance in Still Air
32-Pin QFP..............................................................+76.4°C/W
32-Pin 5mm x 5mm Thin QFN....................................+47°C/W
Junction-to-Case Thermal Resistance
32-Pin 5mm x 5mm Thin QFN......................................+2°C/W
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)
(IN_ _,
IN_ _,
OUT_ _,
OUT_ _,
EN_ _, SEL_ _) ................±2kV
Soldering Temperature (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
= 100Ω
±1%,
EN_ _ = V
CC
, V
CM
= 0.05V to (V
CC
- 0.6V) (MAX9390), V
CM
= 0.6V to (V
CC
- 0.05V)
(MAX9391) 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, T
A
= +25°C.)
(Notes 1, 2, and 3)
PARAMETER
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
DIFFERENTIAL INPUTS (IN_ _,
I N _ _
)
Differential Input Voltage
Input Common-Mode Range
Input Current
LVDS OUTPUTS (OUT_ _,
OU T _ _
)
Differential Output Voltage
Change in Magnitude of V
OD
Between Complementary Output
States
Offset Common-Mode Voltage
Change in Magnitude of V
OS
Between Complementary Output
States
V
OD
∆V
OD
V
OS
∆V
OS
R
L
= 100Ω, Figure 2
Figure 2
Figure 2
Figure 2
1.125
250
350
1.0
1.25
1.0
450
50
1.375
50
mV
mV
V
mV
V
ID
V
CM
I
IN_ _
,
I
IN_ _
V
ILD
> 0 and V
IHD
< V
CC
, Figure 1
MAX9390
MAX9391
MAX9390
MAX9391
|V
ID
| < 3.0V
|V
ID
| < 3.0V
0.1
0.05
0.6
-75
-10
3.0
V
CC
- 0.6
V
CC
- 0.05
+10
+100
V
V
µA
SYMBOL
V
IH
V
IL
I
IH
I
IL
V
IN
= +2.0V to V
CC
V
IN
= 0 to +0.8V
CONDITIONS
MIN
2.0
0
0
0
TYP
MAX
V
CC
0.8
20
10
UNITS
V
V
µA
µA
LVCMOS/LVTTL INPUTS (EN_ _, _SEL_)
2
_______________________________________________________________________________________
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +3.6V, R
L
= 100Ω
±1%,
EN_ _ = V
CC
, V
CM
= 0.05V to (V
CC
- 0.6V) (MAX9390), V
CM
= 0.6V to (V
CC
- 0.05V)
(MAX9391) 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, T
A
= +25°C.)
(Notes 1, 2, and 3)
PARAMETER
Output Short-Circuit Current
(Either Output Shorted to GND)
Output Short-Circuit Current
(Outputs Shorted Together)
SUPPLY CURRENT
R
L
= 100Ω, EN_ _ = V
CC
Supply Current
I
CC
R
L
= 100Ω, EN_ _ = V
CC
, switching at
670MHz (1.34Gbps)
68
68
98
98
mA
SYMBOL
|I
OS
|
|I
OSB
|
CONDITIONS
V
ID
=
±100m
V
(Note 4)
V
OUT_ _
or V
OUT_ _
= 0
V
OUT_ _
= V
OUT_ _
= 0
MIN
TYP
30
18
5.0
MAX
40
24
12
UNITS
mA
mA
MAX9390/MAX9391
V
ID
=
±100mV,
V
OUT_ _
= V
OUT_ _
(Note 4)
AC ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, f
IN
< 1.34GHz, t
R_IN
= t
F_IN
= 125ps, R
L
= 100Ω
±1%,
|V
ID
| > 150mV, V
CM
= +0.075V to (V
CC
- 0.6V)
(MAX9390 only), V
CM
= +0.6V to (V
CC
- 0.075V) (MAX9391 only), EN_ _ = V
CC
, 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, f
IN
= 1.34GHz, T
A
= +25°C.) (Note 5)
PARAMETER
_SEL_ to Switched Output
Disable, Time to Differential
Output Low
Enable, Time to Differential
Output High
Switching Frequency
Low-to-High Propagation Delay
High-to-Low Propagation Delay
Pulse Skew |t
PLH
- t
PHL
|
Output-to-Output Skew
Output Low-to-High Transition
Time (20% to 80%)
Output High-to-Low Transition
Time (80% to 20%)
Added Random Jitter
Added Deterministic Jitter
SYMBOL
t
SWITCH
t
PHD
t
PDH
f
MAX
t
PLH
t
PHL
t
SKEW
t
CCS
t
R
t
F
t
RJ
t
DJ
Figure 3
Figure 4
Figure 4
V
OD
> 250mV
Figures 1, 5
Figures 1, 5
Figures 1, 5 (Note 6)
Figures 5, 6 (Note 7)
Figures 1, 5; f
IN
= 100MHz
Figures 1, 5; f
IN
= 100MHz
f
IN_ _
= 1.34GHz, clock pattern (Note 8)
1.34Gbps, 2 - 1 PRBS (Note 8)
23
CONDITIONS
MIN
TYP
MAX
1.1
1.7
1.7
UNITS
ns
ns
ns
GHz
1.50
294
286
2.20
409
402
7
10
565
530
97
65
185
185
2
55
82
ps
ps
ps
ps
ps
ps
ps
(RMS)
ps
(P-P)
112
112
153
153
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Measurements obtained with the device in thermal equilibrium. All voltages referenced to GND except V
ID
, V
OD
, and
∆V
OD
.
Current into the device defined as positive. Current out of the device defined as negative.
DC parameters tested at T
A
= +25°C and guaranteed by design and characterization for T
A
= -40°C to +85°C.
Current through either output.
Guaranteed by design and characterization. Limits set at
±6
sigma.
t
SKEW
is the magnitude difference of differential propagation delays for the same output over same conditions. t
SKEW
=
|t
PHL
- t
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
MAX9390/MAX9391
Typical Operating Characteristics
(V
CC
= +3.3V, |V
ID
| = 0.2V, V
CM
= +1.2V, f
IN
= 1.34GHz, T
A
= +25°C.)
SUPPLY CURRENT
vs. TEMPERATURE
MAX9390 toc01
OUTPUT AMPLITUDE
vs. FREQUENCY
MAX9390 toc02
OUTPUT RISE AND FALL TIMES
vs. TEMPERATURE
f
IN
= 100MHz
170
RISE/FALL TIME (ps)
160
150
140
130
120
MAX9390 toc03
82
78
SUPPLY CURRENT (mA)
74
70
66
62
58
54
-40
-15
10
35
60
V
CC
= +3V
V
CC
= +3.3V
V
CC
= +3.6V
400
350
OUTPUT AMPLITUDE (mV)
300
250
200
150
100
50
0
180
t
F
t
R
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)
PROPAGATION DELAY
vs. TEMPERATURE
MAX9390 toc04
MAX9390
DIFFERENTIAL INPUT CURRENT
vs. TEMPERATURE
10
5
0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
MAx9390 toc05
MAX9391
DIFFERENTIAL INPUT CURRENT
vs. TEMPERATURE
70
60
INPUT CURRENT (µA)
50
40
30
20
10
0
-10
V
IN
= 0.3V
-40
-15
10
35
60
85
V
IN
= 3.2V
MAX9390 toc06
450
440
PROPAGATION DELAY (ps)
430
420
410
400
390
380
370
360
350
-40
-15
10
35
60
80
V
IN
= 3V
INPUT CURRENT (µA)
V
IN
= -0.1V
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX9390 INPUT CURRENT vs. V
IHD
10
5
0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
MAX9390 toc07
MAX9391
DIFFERENTIAL INPUT CURRENT vs. V
ILD
70
60
INPUT CURRENT (µA)
50
40
30
20
10
0
-10
V
CC
= +3V
IN_ _ OR
IN_ _ = V
CC
V
CC
= +3.6V
MAX9390 toc08
80
IN_ _ OR
IN_ _ = GND
INPUT CURRENT (µA)
V
CC
= +3V
V
CC
= +3.6V
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
IHD
(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
ILD
(V)
4
_______________________________________________________________________________________
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
Pin Description
PIN
1
2
3
4, 9,
20, 25
5
6
7
8, 13,
24, 29
10
NAME
ENB1
OUTB1
OUTB1
GND
ENB0
OUTB0
OUTB0
V
CC
FUNCTION
B1 Output Enable. Drive ENB1 high to enable the B1 LVDS outputs. An internal 435kΩ resistor pulls ENB1
low when unconnected.
B1 LVDS Noninverting Output. Connect a 100Ω termination resistor between OUTB1 and
OUTB1
at the
receiver inputs to ensure proper operation.
B1 LVDS Inverting Output. Connect a 100Ω termination resistor between OUTB1 and
OUTB1
at the
receiver inputs to ensure proper operation.
Ground
B0 Output Enable. Drive ENB0 high to enable the B0 LVDS outputs. An internal 435kΩ resistor pulls ENB0
low when unconnected.
B0 LVDS Noninverting Output. Connect a 100Ω termination resistor between OUTB0 and
OUTB0
at the
receiver inputs to ensure proper operation.
B0 LVDS Inverting Output. Connect a 100Ω termination resistor between OUTB0 and
OUTB0
at the
receiver inputs to ensure proper operation.
Power-Supply Input. Bypass each V
CC
to GND with 0. 1µF and 0.01µF ceramic capacitors. Install both
bypass capacitors as close to the device as possible, with the 0.01µF capacitor closest to the device.
LVDS/HSTL (MAX9390) or LVPECL/CML (MAX9391) Inverting 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) 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
CC
to select the
INB1 (INB1) set of inputs. An internal 435kΩ resistor pulls BSEL0 low when unconnected.
LVDS/HSTL (MAX9390) or LVPECL/CML (MAX9391) Inverting 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) 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 B1 Output. Selects the differential input to reproduce at the B1 differential outputs. Connect
BSEL1 to GND or leave open to select the INB0 (INB0) set of inputs. Connect BSEL1 to V
CC
to select the
INB1 (INB1) set of inputs. An internal 435kΩ resistor pulls BSEL1 low when unconnected.
MAX9390/MAX9391
INB0
11
INB0
12
BSEL0
14
INB1
15
INB1
16
BSEL1
_______________________________________________________________________________________
5
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