AEROFLEX UT54LVDS032 DATA SHEET

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Standard Products

UT54LVDS032 Quad Receiver

Data Sheet

May 22, 2003

FEATURES

q >155.5 Mbps (77.7 MHz) switching rates
q +340mV differential signaling
q 5 V power supply
q TTL compatible outputs
q Ultra low power CMOS technology
q 8.0ns maximum propagation delay
q 3.0ns maximum differential skew
q Radiation-hardened design; total dose irradiation testing to

MIL-STD-883 Method 1019

- Total-dose: 300 krad(Si) and 1Mrad(Si)

- Latchup immune (LET > 111 MeV-cm2/mg)

q Packaging options:

- 16-lead flatpack (dual in-line)

q Standard Microcircuit Drawing 5962-95834

- QML Q and V compliant part

q Compatible with IEEE 1596.3SCI LVDS
q Compatible with ANSI/TIA/EIA 644-1996 LVDS Standard

INTRODUCTION

The UT54LVDS032 Quad Receiver is a quad CMOS
differential line receiver designed for applications requiring
ultra low power dissipation and high data rates. The device
is designed to support data rates in excess of 155.5 Mbps
(77.7 MHz) utilizing Low Voltage Differential Signaling
(LVDS) technology.

The UT54LVDS032 accepts low voltage (340mV)
differential input signals and translates them to 5V TTL
output levels. The receiver supports a three-state function
that may be used to multiplex outputs. The receiver also
supports OPEN, shorted and terminated (100 Ω) input fail-
safe. Receiver output will be HIGH for all fail-safe
conditions.

The UT54LVDS032 and companion quad line driver
UT54LVDS031 provides new alternatives to high power
pseudo-ECL devices for high speed point-to-point interface
applications.

R
R

R
R

R
R

R
R

IN1+

IN1-

IN2+

IN2-

IN3+

IN3-

IN4+

IN4-

+
R1

-

+
R2

-

+
R3

-

+
R4

-

R

R

R

R

OUT1

OUT2

OUT3

OUT4

EN
EN

Figure 1. UT54LVDS032 Quad Receiver Block Diagram

1
2

3
4EN

5
6
7

8

UT54LVDS032

Receiver

R

R

R

R

R

R

IN1-

IN1+

OUT1

OUT2

IN2+

IN2-

V

SS

Figure 2. UT54LVDS032 Pinout

16

15
14

13
12
11

10

APPLICATIONS INFORMATION

The UT54LVDS032 receiver’s intended use is primarily in an
uncomplicated point-to-point configuration as is shown in

V

DD

R

IN4-

R

IN4+

R

OUT4

EN
R

OUT3

R

IN3+

9

R

IN3-

Figure 3. This configuration provides a clean signaling
environment for quick edge rates of the drivers. The receiver is
connected to the driver through a balanced media which may be
a standard twisted pair cable, a parallel pair cable, or simply
PCB traces. Typically, the characteristic impedance of the media
is in the range of 100Ω. A termination resistor of 100Ω should
be selected to match the media and is located as close to the
receiver input pins as possible. The termination resistor converts
the current sourced by the driver into voltages that are detected
by the receiver. Other configurations are possible such as a
multi-receiver configuration, but the effects of a mid-stream
connector(s), cable stub(s), and other impedance discontinuities,
as well as ground shifting, noise margin limits, and total
termination loading must be taken into account.

TRUTH TABLE

Enables Input Output

EN EN R

- RIN- R

IN+

L H X Z

All other combinations

of ENABLE inputs

VID > 0.1V H

VID < -0.1V L

Full Fail-safe

OPEN/SHORT or

Terminated

PIN DESCRIPTION

Pin No. Name Description

2, 6, 10, 14 R

1, 7, 9, 15 R

3, 5, 11, 13 R

IN+

IN-

OUT

Non-inverting receiver input pin

Inverting receiver input pin

Receiver output pin

4 EN Active high enable pin, OR-ed

with EN

12 EN Active low enable pin, OR-ed

with EN

OUT

H

ENABLE

DATA

INPUT

1/4 UT54LVDS031

RT 100 Ω

1/4 UT54LVDS032

+

-

DATA

OUTPUT

Figure 3. Point-to-Point Application

The UT54LVDS032 differential line receiver is capable of
detecting signals as low as 100mV, over a + 1V common-mode
range centered around +1.2V. This is related to the driver offset
voltage which is typically +1.2V. The driven signal is centered
around this voltage and may shift +1V around this center point.
The +1V shifting may be the result of a ground potential
difference between the driver’s ground reference and the
receiver’s ground reference, the common-mode effects of
coupled noise or a combination of the two. Both receiver input
pins should honor their specified operating input voltage range
of 0V to +2.4V (measured from each pin to ground).

16 V

8 V

DD

SS

Power supply pin, +5V + 10%

Ground pin

2

Receiver Fail-Safe

The UT54LVDS032 receiver is a high gain, high speed device
that amplifies a small differential signal (20mV) to TTL logic
levels. Due to the high gain and tight threshold of the receiver,
care should be taken to prevent noise from appearing as a valid
signal.

The receiver’s internal fail-safe circuitry is designed to source/
sink a small amount of current, providing fail-safe protection (a
stable known state of HIGH output voltage) for floating,
terminated or shorted receiver inputs.

1. Open Input Pins. The UT54LVDS032 is a quad

receiver device, and if an application requires only 1, 2
or 3 receivers, the unused channel(s) inputs should be
left OPEN. Do not tie unused receiver inputs to ground
or any other voltages. The input is biased by internal high
value pull up and pull down resistors to set the output to
a HIGH state. This internal circuitry will guarantee a
HIGH, stable output state for open inputs.

2. Terminated Input . If the driver is disconnected (cable

unplugged), or if the driver is in a three-state condition,
the receiver output will again be in a HIGH state, even
with the end of cable 100Ω termination resistor across
the input pins. The unplugged cable can become a
floating antenna which can pick up noise. If the cable
picks up more than 10mV of differential noise, the
receiver may see the noise as a valid signal and switch.
To insure that any noise is seen as common-mode and
not differential, a balanced interconnect should be used.
Twisted pair cable offers better balance than flat ribbon
cable.

3. Shorted Inputs. If a fault condition occurs that shorts

the receiver inputs together, thus resulting in a 0V
differential input voltage, the receiver output remains in
a HIGH state. Shorted input fail-safe is not supported
across the common-mode range of the device (VSS to

2.4V). It is only supported with inputs shorted and no
external common-mode voltage applied.

3

ABSOLUTE MAXIMUM RATINGS

(Referenced to VSS)

SYMBOL PARAMETER LIMITS

1

V

DD

V

I/O

T

STG

P

D

T

J Maximum junction temperature

Θ

JC

I

I

Notes:

1. Stresses outside the listed absolute maximum ratings may cause permanent damage to the device. This is a stress rating only, and functional operation of the device
at these or any other conditions beyond limits indicated in the operational sections of this specification is not recommended. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability and performance.

2. Maximum junction temperature may be increased to +175°C during burn-in and steady-static life.

3. Test per MIL-STD-883, Method 1012.

DC supply voltage -0.3 to 6.0V
Voltage on any pin -0.3 to (VDD + 0.3V)
Storage temperature -65 to +150°C

Maximum power dissipation 1.25 W

2

Thermal resistance, junction-to-case
DC input current

3

+150°C

10°C/W

±10mA

RECOMMENDED OPERATING CONDITIONS

SYMBOL PARAMETER LIMITS

V

DD

T

C

Positive supply voltage 4.5 to 5.5V
Case temperature range -55 to +125°C

V

IN

DC input voltage, receiver inputs
DC input voltage, logic inputs

2.4V

0 to VDD for EN, EN

4