
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
100
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.
Applications
High-Speed Telecom/Datacom Equipment
Central-Office Backplane Clock Distribution
DSLAM
Protection Switching
Fault-Tolerant Systems
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
M
Anything-to-LVDS Dual 2 x 2
Crosspoint Switches
________________________________________________________________
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.
1
TOP VIEW
MAX9390
MAX9391
TQFP
32
28
29
30
31
25
26
27
I
I
V
C
A
A
I
I
G
10
I
13
V
C
15
I
14
I
16
B
11
I
12
B
9
G
17
18
19
20
21
22
23 OUTA0
24 V
CC
OUTA0
ENA0
GND
OUTA1
OUTA1
ENA1
2
3
4
5
6
7
8
V
CC
OUTB0
OUTB0
GND
OUTB1
OUTB1
1
ENB1
ENB0
PART
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
MAX9390
EHJ
MAX9390ETJ*
MAX9391
EHJ
MAX9391ETJ*
Pin Configurations
Ordering Information
19-2829; Rev 1; 7/03
*
Future product—contact factory for availability.
Pin Configurations continued at end of data sheet.
Functional Diagram and Typical Operating Circuit appear at
end of data sheet.