max9394eti-t Maxim Integrated Products, Inc., max9394eti-t Datasheet - Page 9

• Manufacturer Part Number: max9394eti-t
• Description: 2 1 Multiplexers And 1 2 Demultiplexers With Loopback
• Manufacturer: Maxim Integrated Products, Inc.

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.
The MAX9394/MAX9395 high-speed, low-power 2:1
multiplexers and 1:2 demultiplexers with loopback pro-
vide signal redundancy switching in telecom and stor-
age applications. These devices select one of two
remote signal sources for local input and buffer a single
local output signal to two remote receivers.
The multiplexer section (channel B) accepts two differen-
tial inputs and generates a single LVDS output. The
demultiplexer section (channel A) accepts a single differ-
ential input and generates two parallel LVDS outputs. The
MAX9394/MAX9395 feature a loopback mode that con-
nects the input of channel A to the output of channel B
and connects the selected input of channel B to the out-
puts of channel A. LB_SELA and LB_SELB provide inde-
pendent loopback control for each channel.
Three LVCMOS/LVTTL logic inputs control the internal
connections between inputs and outputs, one for the
multiplexer portion of channel B (BSEL), and the other
two for loopback control of channels A and B (LB_SELA
and LB_SELB). Independent enable inputs for each dif-
ferential output pair provide additional flexibility.
The differential inputs of the MAX9394/MAX9395 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 MAX9394 provides
Figure 6. Output Channel-to-Channel Skew
2:1 Multiplexers and 1:2 Demultiplexers with
_______________________________________________________________________________________
Detailed Description
V
V
V
V
OUTA0
OUTA0
OUTA1
OUTA1
Input Fail-Safe
V
t
CCS
OD
V
OD
= 0V
= V
OUT_ _
V
OD
= 0V
- V
high-level input fail-safe detection for LVDS, HSTL, and
other GND-referenced differential inputs. The MAX9395
provides low-level input fail-safe detection for LVPECL,
CML, and other V
BSEL selects the differential input pair to transmit
through OUTB (OUTB) for LB_SELB = GND or through
OUTA_ (OUTA_) for LB_SELA = V
the loopback function for each channel. Connect
LB_SEL_ to GND to select the normal inputs for each
channel. Connect LB_SEL_ to V
back function. The loopback function routes the input of
channel A to the output of channel B, and the inputs of
channel B to the outputs of channel A. See Tables 1
and 2 for a summary of the input/output routing
between channels.
The EN_ _ logic inputs enable and disable each set of
differential outputs. Connect EN_ 0 to V
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 differential
low condition when disabled.
The MAX9394/MAX9395 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
(V
Leave unused inputs unconnected or connect to V
for the MAX9394 or to GND for the MAX9395.
OUT_ _
CM
≥ V
V
t
CC
CCS
OD
= 0V
- 0.6V, MAX9394; V
V
Applications Information
OD
CC
= 0V
-referenced differential inputs.
Loopback
Differential Inputs
CC
CM
CC
Enable Function
Select Function
to enable the loop-
≤ 0.6V, MAX9395).
. LB_SEL_ controls
CC
to enable the
CC
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