Datasheet DS3486N, DS3486MX Datasheet (NSC)

DS3486
Quad RS-422, RS-423 Line Receiver

General Description

National’s quad RS-422, RS-423 receiver features four inde­pendent receivers which comply with EIA Standards for the
electrical characteristics of balanced/unbalanced voltage
digital interface circuits. Receiver outputs are 74LS compat­ible, TRI-STATE

®

structures which are forced to a high im­pedance state when the appropriate output control pin
reaches a logic zero condition. A PNP device buffers each
output control pin to assure minimum loading for either logic
one or logic zero inputs. In addition, each receiver has inter­nal hysteresis circuitry to improve noise margin and discour­age output instability for slowly changing input waveforms.

Features

n Four independent receivers
n TRI-STATE outputs
n Internal hysteresis −140 mV (typ)
n Fast propagation times −19 ns (typ)
n TTL compatible outputs
n 5V supply
n Pin compatible and interchangeable with MC3486

Block and Connection Diagrams

TRI-STATE®is a registeredtrademark of National Semiconductor Corp.

DS005779-1

Dual-In-Line Package

DS005779-2

Top View

Order Number DS3486M or DS3486N

See NS Package Number M16A or N16E

May 1998

DS3486 Quad RS-422, RS-423 Line Receiver

© 1999 National Semiconductor Corporation DS005779 www.national.com

Absolute Maximum Ratings (Note 2)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

Power Supply Voltage, V

CC

8V

Input Common-Mode Voltage,
V

ICM

±

25V

Input Differential Voltage, V

ID

±

25V

TRI-STATE Control Input
Voltage, V

I

8V

Output Sink Current, I

O

50 mA

Storage Temperature, T

STG

−65˚C to +150˚C

Maximum Power Dissipation (Note 1) at 25˚C

Molded Dip Package 1362 mW
SO Package 1002 mW

Operating Conditions

Max Min Units

Power Supply Voltage, V

CC

4.75 5.25 V

Operating Temperature, T

A

070˚C

Input Common-Mode Voltage −7.0 7.0 V

Range, V

ICR

Note 1: Derate Dip molded package 10.2 mW/˚C above 25˚C. Derate SO
package 8.01 mW/˚C above 25˚C.

Electrical Characteristics (Note 3)

(Unless otherwise noted, minimum and maximum limits apply over recommended temperature and power supply voltage
ranges. Typical values are for T

A

=

25˚C, V

CC

=

5V and V

IC

=

0V.)

Symbol Parameter Conditions Min Typ Max Units

V

IH

Input Voltage —High Logic State 2.0 V
(TRI-STATE Control)

V

IL

Input Voltage —Low Logic State 0.8 V
(TRI-STATE Control)

V

TH(D)

Differential Input Threshold Voltage −7V ≤ VIC≤ 7V, VIHTRI-STATE=2V 0.070 0.2 V

I

O

=

−0.4 mA, V

OH

≥ 2.7V

I

O

=

8 mA, V

OL

≥ 0.5V 0.070 −0.2 V

I

IB (D)

Input Bias Current V

CC

=

0V or 5.25V, Other Inputs at 0V

V

I

=

−10V −3.25 mA

V

I

=

−3V −1.50 mA

V

I

=

3V 1.50 mA

V

I

=

10V 3.25 mA

Input Balance −7V ≤ V

IC

≤ 7V, V

IH(3C)

=

2V,

(Note 5)

V

OH

I

O

=

−0.4 mA, V

ID

=

0.4V 2.7 V

V

OL

I

O

=

8 mA, V

ID

=

−0.4V 0.5 V

I

OZ

Output TRI-STATE Leakage Current V

I(D)

=

3V, V

IL

=

0.8V, V

OL

=

0.5V −40 µA

V

I(D)

=

−3V, V

IL

=

0.8V, V

OH

=

2.7V 40 µA

I

OS

Output Short-Circuit Current V

I(D)

=

3V, V

IH

TRI-STATE=2V, −15 −100 mA

V

O

=

0V, (Note 4)

I

IL

Input Current —Low Logic State V

IL

=

0.5V −100 µA

(TRI-STATE Control)

I

IH

Input Current —High Logic State V

IH

=

2.7V 20 µA

(TRI-STATE Control) V

IH

=

5.25V 100 µA

V

IC

Input Clamp Diode Voltage I

IN

=

−10 mA −1.5 V

(TRI-STATE Control)

I

CC

Power Supply Current All Inputs V

IL

=

0V 85 mA

Note 2: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The table of “Electrical Characteristics” provides conditions for actual device operation.

Note 3: All currents into device pins are shown as positive, out of device pins are negative. All voltages referenced to ground unless otherwise noted.
Note 4: Only one output at a time should be shorted.
Note 5: Refer to EIA RS-422/3 for exact conditions.

www.national.com 2

Switching Characteristics

(Unless otherwise noted, V

CC

=

5V and T

A

=

25˚C.)

Symbol Parameter Min Typ Max Units

t

PHL(D)

Propagation Delay Time— Differential Inputs to Output

Output High to Low 19 35 ns

t

PLH(D)

Output Low to High 19 30 ns

t

PLZ

TRI-STATE Control to Output

Output Low to TRI-STATE 23 35 ns

t

PHZ

Output High to TRI-STATE 25 35 ns

t

PZH

Output TRI-STATE to High 18 30 ns

t

PZL

Output TRI-STATE to Low 20 30 ns

AC Test Circuits and Switching Time Waveforms

DS005779-3

DS005779-4

Input pulse characteristics:
t

TLH

=

t

THL

=

6ns(10%to 90%)

PRR=1 MHz, 50%duty cycle

FIGURE 1. Propagation Delay Differential Input to Output

www.national.com3

AC Test Circuits and Switching Time Waveforms (Continued)

DS005779-5

1.5V for t

PHZ

and t

PLZ

1.5V for t

PLZ

and t

PZL

Input pulse characteristics:
t

TLH

=

t

THL

=

6ns(10%to 90%)

PRR=1 MHz, 50%duty cycle

t

PLZ

DS005779-6

t

PHZ

DS005779-7

t

PZH

DS005779-8

t

PZL

DS005779-9

FIGURE 2. Propagation Delay TRI-STATE Control Input to Output

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Physical Dimensions inches (millimeters) unless otherwise noted

SO Package (M)

Order Number DS3486M

NS Package Number M16A

Molded Dual-In-Line Package (N)

Order Number DS3486N

NS Package Number N16E

www.national.com5

Notes

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.

2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.

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DS3486 Quad RS-422, RS-423 Line Receiver

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.