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MAX9394/MAX9395

Detailed Description

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.

Input Fail-Safe

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

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

-referenced differential inputs.

Select Function

BSEL selects the differential input pair to transmit

through OUTB (OUTB) for LB_SELB = GND or through

OUTA_ (OUTA_) for LB_SELA = V

. LB_SEL_ controls

the loopback function for each channel. Connect

LB_SEL_ to GND to select the normal inputs for each

channel. Connect LB_SEL_ to V

to enable the loop-

2:1 Multiplexers and 1:2 Demultiplexers with

Loopback

6 _______________________________________________________________________________________

Pin Description (continued)

TQFP QFN

NAME FUNCTION

21 19 ENA0

Channel A0 Output Enable. Drive ENA0 high to enable the A0 LVDS outputs. An

internal 435kΩ resistor to GND pulls ENA0 low when unconnected.

22 20 OUTA0

Channel A0 LVDS Inverting Output. Connect a 100Ω termination resistor between

OUTA0 and OUTA0 at the receiver inputs to ensure proper operation.

23 21 OUTA0

Channel A0 LVDS Noninverting Output. Connect a 100Ω termination resistor between

OUTA0 and OUTA0 at the receiver inputs to ensure proper operation.

26 24 INA

LVDS/HSTL (MAX9394) or LVPECL/CML (MAX9395) Noninverting Input. An internal

128kΩ pullup resistor to V

pulls the input high when unconnected (MAX9394). An

internal 68kΩ resistor to GND pulls the input low when unconnected (MAX9395).

27 25 INA

LVDS/HSTL (MAX9394) or LVPECL/CML (MAX9395) Inverting Input. An internal

128kΩ pullup resistor to V

pulls the input high when unconnected (MAX9394). An

internal 68kΩ resistor to GND pulls the input low when unconnected (MAX9395).

28 26 LB_SELA

Loopback Select for Channel A Output. Connect LB_SELA to GND or leave

unconnected to reproduce the INA (INA) differential inputs at OUTA_ (OUTA_).

Connect LB_SELA to V

to loop back the INB_ (INB_) differential inputs to OUTA_

(OUTA_). An internal 435kΩ resistor to GND pulls LB_SELA low when unconnected.

——EP Exposed Paddle. Connect to GND for optimal thermal and EMI characteristics.

1 2 3 4 5 6 7 8 9 10 11 12 13

MAX9394/MAX9395 1
Loopback 1

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