Datasheet MC1489D, MC1489AP, MC1489P, MC1489AD Datasheet (SGS Thomson Microelectronics)

MC1489



■ INPUTRESISTANCE–3kto7kΩ

■ INPUTSIGNALRANGE– ± 30V

■

INPUTTHRESHOLDHYSTERESISBUILT-IN

■ RESPONSECONTR OL:

a) LOGICTHRESHOLDSHIFTING
b) INPUT NOISEFILTERING

DESCRIPTION

The MC1489 monolithic quad line receivers are
designed to interface data therminal equipment
with data communications equipment in
conformance with the specifications of EIA
StandardNo. RS-232C.

MC1489A

QUAD LINE RECEIVERS

P

DIP14

( Plastic)

D

SO14

(PlacticMicropackage)

PIN CONNECTION

ORDERCODES:

MC1489P,MC1489AP(DIP–14 Plastic)

MC1489D,MC1489AD(SO-14)

(topview)

March 2000

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MC1489 / MC1489A

SCHEMATIC DIAGRAM (1/4 of circuit shown)

ABSOLUTE MAXIMUM RATINGS

Symb ol Parameter Value Unit

V

Power Supply Voltage 10 V

S

V

Input Voltage Range

I

I

Output Load Current 20 mA

OL

P

Power Dissipation 1 W

tot

T

Operating Ambient Temperature 0 to 75

amb

T

Storage Temperature Range –65 to 150

stg

30 V

±

o

C

o

C

ELECTRICAL CHARACTERISTICS

ResponseControl Pin is Open ; V

= 5 V,T

S

Symb ol Parameter Test Cond t i ons Mi n . Typ . Max. Unit

Positive Input Current VIH=25V

I

IH

I

Negative Input Current VIL=_25V

IL

V

Input Turn-on Threshold Voltage

IH

V

Input Turn-off Threshold Voltage

IL

V

V

Ouptut Voltage High VIH= 0.75V, IL=-0.5mA

OH

Output Voltage Low VIL= 3V, IL= 10mA 0.2 0.45 V

OL

I

Output Short Circuit Current

OS

I

Power Supply Current All gates ”on”, Io=0mA

S

P

Power Consumption VIH= 5V 80 130 mW

C

= 0 to 75oC, unless otherwise specified

amb

3.6

V

IH

=3V

0.43

-3.6

V

=_3V

IL

=25oC, V

T

amb

= 10mA for MC1489

I

L

OL

0.45

≤

forMC1489A

=25oC, V

T

amb

I

= -0.5mA

L

= 0.5mA Input Open Circuit

I

L

V

=5V 16 26

IH

OL

2.5V

≥

-0.43

1

1.75 1.95

0.75 1.25

2.5

2.5

4
4

_

3

8.3 mA

-8.3 mA

1.5

2.25

5
5

_

4mA

mA

V

V

V

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MC1489 / MC1489A

SWITCHING CHARACTERISTICS

= 5V,T

V

S

Symbol Parameter Test Condtions Min. Typ. Max. Unit

t

PLH

t

TLH

t

PHL

t

THL

TESTCIRCUITS
Figure1 :

=25oC, see Figure1

amb

Propagation delay Time
Rise Time
Propagation Delay Time
Fall Time

Switching Response

R
R
R
R

=3.9k

L
L
L
L

Ω

=3.9k

Ω

=390

Ω

=390

Ω 10 20 ns

Figure2 :

ResponseControl Node

25 85 ns

120 175 ns

25 50 ns

Figure3 :

Input Current

Figure4 :

C: capacitor is fornoisefiltering

OutputShort-CircuitCurrent

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MC1489 / MC1489A

Figure5 :OutputVoltage and Input Threshold

Voltage

TYPICALAPPLICATION: RS232CData Transmission

Figure6 :Power Supply Current

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MC1489 / MC1489A

TYPICALCHARACTERISTICS

V

= 5V,T

S

Figure7 :Input Current Figure8 :MC1489Input ThresholdVoltage

=25oC, unlessotherwisespecified

amb

Adjustment

Figure9 :MC1489A Input ThresholdVoltage
Adjustment

Figure11 :

InputThreshold versusPower Supply

Voltag

Figure10 :InputThreshold versus Temperature

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MC1489 / MC1489A

APPLICATION INFORMATION
GENERAL INFORMATION

The Electronic Industries Association (EIA) has
released the RS-232C specification detailing the
requirements for the interface between data
processing equipment and data communications
equipment. This standard specifies not only the
number and type of interface leads, but also the
voltage levels to be used. The MC1488 quad
driver and its companion circuit, the MC1489
quad receiver, provide a complete interface
system between DTL or TTL logic levels and the
RS-232C defined levels. The RS-232C
requirements as applied to receivers are
discussedherein.

The required input impedance is defined as
between 3000Ω and 7000Ω for input voltages

between 3.0 and 25V in magnitude ; and any
voltage on the receiver input in an open circuit
condition must be less than 2.0V in magnitude.
The MC1489 circuits meet these requirements
witha maximum open circuitvoltage of one V

The receiver shall detect a voltage between - 3.0
and - 25V as a Logic ”1” and inputs between +

3.0 and + 2.5V as a Logic ”0”. On some
interchangeleads, an open circuit of power ”OFF”
condition (300Ω or more to ground) shall be
decoded as an ”OFF” condition or Logic ”1”. For
the reason, the input hysteresis thresholds of the
MC1489 circuits are all above ground. Thus an
open or grounded input will cause the same
output as a negativeor Logic ”1” input.

DEVICECHARACTERISTICS

The MC1489 interface receivers have internal
feedback from the second stage to the input
stage providing input hysteresis for noise

BE

rejection. The MC1489 input has typical turn-on
voltage of 1.25Vand turn-off of 1.0 V for a typical
hysteresis of 250mV. The MC1489A has typical
turn-on of 1.95V and turn-off of 0.8V for typically

1.15V of hysteresis.
Each receiver section has an external response

control node in addition to the input and output
pins, thereby allowing the designer to vary the
input threshold voltage levels. A resistor can be
connected between this node and and an
external power supply. Figures 2, 4 and 5
illustratethe inputthreshold vol­tage shiftpossible through this technique.

This response node can also be used for the
filtering of the high-frequency, high-energy noise
pulses. Figures 8 and 9 show typical noise-pulse
rejection for externalcapacitors of various sizes.

These two operations on the response node can
be combined or used individually for may
combinations of interfacing applications. The
MC1489 circuits are particularly useful for

.

interfacing between MOS circuits and
MDTL/MTTL logic systems. In this application,
the input threshold voltages are adjusted. (with
the appropiate supply and resistor values) to fall
in the center of the MOS voltage logic levels (see
Figure 10).

The response node may also be used as the
receiver input as long as the designer realizes
that he may not drive this node with a low
impedance source to a voltage greater than one
diode above ground or less than one diodebelow
ground. This feature is demonstrated in Figure 11
where two receivers are slaved to the same line
that must still meet the RS-232C impedance
requirement.

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MC1489 / MC1489A

Figure12 :TypicalTurn-on Therhold versus

Capacitancefrom Response Control
Pinto GND

Figure 13 :TypicalTurn-on Therholdversus
Capacitancefrom Response Control
Pin to GND

Figure14 : TypicalParallelingof Two MC1489/AReceiversto Meet RS-232C

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MC1489 / MC1489A

Plastic DIP-14 MECHANICAL DATA

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

a1 0.51 0.020

B 1.39 1.65 0.055 0.065
b 0.5 0.020

b1 0.25 0.010

D 20 0.787
E 8.5 0.335
e 2.54 0.100

e3 15.24 0.600

F 7.1 0.280

I 5.1 0.201
L 3.3 0.130
Z 1.27 2.54 0.050 0.100

mm inch

8/10

P001A

SO-14 MECHANICALDATA

MC1489 / MC1489A

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 1.75 0.068

a1 0.1 0.2 0.003 0.007
a2 1.65 0.064

b 0.35 0.46 0.013 0.018

b1 0.19 0.25 0.007 0.010

C 0.5 0.019

c1 45 (typ.)

D 8.55 8.75 0.336 0.344
E 5.8 6.2 0.228 0.244
e 1.27 0.050

e3 7.62 0.300

F 3.8 4.0 0.149 0.157
G 4.6 5.3 0.181 0.208
L 0.5 1.27 0.019 0.050

M 0.68 0.026

S 8 (max.)

mm inch

P013G

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MC1489 / MC1489A

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granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject tochange withoutnotice. This publication supersedes and replaces allinformation previously supplied. STMicroelectronics products
are not authorized for use as critical components in lifesupport devices or systems withoutexpress written approval of STMicroelectronics.

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