SGS Thomson Microelectronics ST75185CDR, ST75185CD, ST75185CN Datasheet

ST75185

MULTIPLE RS-232 DRIVERS AND RECEIVERS



June 2000

■ MEETS ANDEXCEEDSTHE

REQUIREM EN TSOFEIA/TIA-232-EAND
ITUV.28STANDARD

■

SINGLECHIPWITHEASYINTERFACE
BETWEEN UARTAND SERIALPORT
CONNECTOROFIBMPC/AT AND
COMPATIBLES

■ DESIGNEDTO SUPPORTDATARATESUP

TO120 Kbps

■ PINOUT COMPATIBLEWITHST75C185

DESCRIPTION

The ST75185 contains three drivers and five
receivers. The pinout matches the DB9S
connector design in order to decrease the part
count, reducethe boardspace requiredand allow
easy interconnection of the UART and serialport
connectorof IBM PC/AT and compatibles. The
bipolar circuits and processing of the ST75185
provides a rugged low-cost solution for this
function at the expense of quiescent power and
external passive components relative to the
ST75C185.

The ST75185 complies with the requirements of
the EIA/TIA 232-E and ITU (formallyCCITT) v.28

standards. These standards are for data
interchange between a host computer and
peripheral at signallingrates up to 20k-bits/s.The
switchingspeeds of the ST75185 are fast enough
to support rates up to 120K-bits/s with lower
capacitive loads (shorter cables). Interoperability
at the higher signalling rates cannot be assured
unless the designer has design control of the
cable and the interface circuits at the both ends.
For interoperability at signalling rates to 120
K-bits/s, use of EIA/ITA-423-B (ITU v.10) and
EIA/ITA-422-B (ITU v.11) standards are
recommended.

The ST75185 is characterized for operation over
the range of 0

o

Cto70oC.

PIN CONNECTION IEC LOGICSYMBOL AND LOGICDIAGRAM

ORDERCODES :

ST75185CN ST75185CD

D

(Micro Package)

N

(PlasticPackage)

1/12

ORDERCODES

Typ e T emperature Range Packag e Commen ts

ST75185CN 0 to 70

o

C DIP-20 20 parts per tube / 50 tubesper box

ST75185CD 0 to 70

o

C SO-20 (Tube) 40 parts per tube / 25 tubesper box

ST75185CDR 0 to 70

o

C SO-20 (Tape &Reel) 1000 parts per reel

PIN DESCRIPTION

PIN No SYMBOL NAME AND F UNCTION

1V

DD

Supply Voltage (+12V)
2 RA1 First Receiver Input
3 RA2 Second Receiver Input
4 RA3 Third Receiver Input
5 DY1 First Driver Output
6 DY2 Second Driver Output
7 RA4 FourthReceiver Input
8 DY3 Third Driver Output
9 RA5 Fifth Receiver Input

10 V

SS

Supply Voltage (-12V)

11 GND Ground
12 RY5 Fifth Receiver Output
13 DA3 Third Driver Input
14 RY4 Fourth Receiver Output
15 DA2 Second Driver Input
16 DA1 First Driver Input
17 RY3 Third Receiver Output
18 RY2 Second Receiver Output
19 RY1 First Receiver Output
20 V

CC

Supply Voltage (+5V)

ST75185

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ABSOLUTE MAXIMUM RATINGSOVER OPERATINGFREE-AIR TEMPERATURE RANGE

(unlessotherwise specified)

Symb o l P ara meter Val u e Un i t

V

DD

Supply Voltage (Note 1) 15 V

V

SS

Supply Voltage (Note 1) -15 V

V

CC

Supply Voltage (Note 1) 10 V

V

I

Input Voltage Range (DRIVER) -15 to 7 V

V

I

Input Voltage Range (RECEIVER) -30 to 30 V

V

O

Output Voltage Range (DRIVER) -15 to 15 V

I

O

Receiver Low Level Output Current 20 mA

P

D

Continuous Total Power Dissipation See Dissipation Rating Table

T

A

Operating Free-Air Temperature Range 0 to 70

o

C

T

stg

Storage Temperature Range -65 to +150

o

C

T

L

Lead Temperature 1.6mm from case for 10 sec 260

o

C

AbsoluteMaximumRatingsarethose values beyond whichdamage tothedevicemayoccur. Functionaloperationunderthese condition isnotimplied.
NOTE1:Allvoltage arewithrespecttothenetworkground terminal.

DISSIPATION RATING TABLE

Packag e Pow er Rating

at T

A

≤

25

o

C

Derati n g F actor

above TA=25oC(*)

Power Rating

at T

A

≤

70

o

C

MICROPACKAGE (D) 1125 mW 9.0 mW/

o

C 720 mW

DIP (N) 1150 mW 9.2 mW/

o

C 736 mW

(*)This is thereverse of the traditional junction-case thermal resistance R

tJ-C

RECOMMENDED OPERATINGCONDITIONS

Symb o l P a rameter Mi n Max Uni t

V

DD

Supply Voltage 7.5 15 V

V

SS

Supply Voltage -7.5 -15 V

V

CC

Supply Voltage 4.5 5.5 V

V

IN

Driver Input Voltege 0 V

CC

V

I

OH

High Level Output Current DRIVER -6 mA

RECEIVER -0.5

I

OL

Low Level Output Current DRIVER 6 mA

RECEIVER 16

T

A

Operating Free-Air Temperature 0 70

o

C

ST75185

3/12

SUPPLYCURRENTS

Symbol Parameter Test C ondition s Value Unit

V

DD

V

SS

Min. Typ. Max.

I

DD

Supply Current from V

DD

9-9

No load.

All inputs at

1.9V

15

mA

12 -12 19
15 -15 25

9-9

No load.

All inputs at

0.8V

4.5 mA
12 -12 5.5
15 -15 9

I

SS

Supply Current from V

SS

9-9

No load.

All inputs at

1.9V

-15

mA

12 -12 -19
15 -15 -25

9-9

No load.

All inputs at

0.8V

-3.2 mA
12 -12 -3.2
15 -15 -3.2

I

CC

Supply Current from V

CC

No load. All inputs at 5V

V

CC

=5V

30 mA

DRIVERELECTRICALCHARACTERISTICS OVER OPERATINGFREE-AIR TEMPERATURE
RANGE (V

DD

= 9V, VSS= -9V,VCC=5V, unlessotherwise specified)

Symbol Parameter Test C ondition s Value Unit

Min. Typ. Max.

V

OH

High Level Output Voltage

V

IL

=0.8V RL=3KΩ

(See Figure 1)

6 7.5

V

V

OL

Low Level Output Voltage (Note 3)

V

IH

=1.9V RL=3KΩ

(See Figure 1)

-7.5 -6 V

I

IH

High Level Input Current VI= 5 V (See Figure 2) 10

µ

A

I

IL

Low Level Input Current VI= 0 V (See Figure 2) -1.6 mA

I

OS(H)

High Level Short Circuit Output Current
(Note 4)

VIL=0.8V VO=0V
(See Figure 1)

-4.5 -12 -19.5 mA

I

OS(L)

Low Level Short Circuit Output Current VIH=2V VO=0V

(See Figure 1)

4.5 12 19.5 mA

R

O

Output Resistance VDD=VSS=VCC=0V

V

O

= -2 to 2 V (Note 5)

300

Ω

NOTE3:

The algebraic convention, where the more positive (less negative) limitisdesignated as maximum, isused in this datasheet for logic levels only

(e.g.if-10V isa maximum,thetypicalvalue isa morenegative voltage).

NOTE4:

Outputshortcircuitconditions must mantainthetotal power dissipation below absolute maximumratings.

NOTE5: Testcond ition s arethose specifiedby EIA-232-Eand aslisted above.

ST75185

4/12

RECEIVERELECTRICAL CHARACTERISTICS OVER OPERATING CONDITIONS

Symbol Parameter Test C ondition s Value Unit

Min. Typ. Max.

V

T+

Positive Going Threshold Voltage (See Figure 6) 2.2 2.4 V

V

T-

Negative Going Threshold Voltage TA=25oC (See Figure 6) 0.75 0.97 V

V

hys

Input Hysteresis (VT+-VT-) 0.5

V

V

OH

High Level Output Voltage IOH= -0.5mA VIH= 0.75 V 2.6 4 5

V

Inputs Open 2.6

V

OL

Low Level Output Voltage VI=3V IOL= 10 mA 0.2 0.45 V

I

IH

High Level Input Current VI= 25 V (See Figure 6) 3.6 8.3 mA

V

I

= 3 V (See Figure 6) 0.43

I

IL

Low Level Input Current VI= -25 V (See Figure 6) -3.6 -8.3 mA

V

I

= -3 V (See Figure 6) -0.43

I

OS

Short-Circuit Output Current VI=0V VO=0V

(See Figure 5)

-3.4 -12 mA

Alltypicalvalues areatTA=25oC,VCC=5V,VDD=9VandVSS=-9V

DRIVERSWITCHING CHARACTERISTICS

(V

DD

= 12V, VSS=-12V, VCC=5V TA=25oC)

Symbol Parameter Test C ondition s Value Unit

Min. Typ. Max.

t

PLH

Propagation Delay Time, Low to High
Level Output

R

L

=3to7KΩ CL=15pF

(See Figures 3, 4)

315 500

ns

t

PHL

Propagation Delay Time High to Low
Level Output

R

L

=3to7KΩCL=15pF

(See Figures 3, 4)

75 175 ns

t

TLH

Transition Time Low to High Level
Output

R

L

=3to7KΩ CL=15pF

(See Figures 3, 4)

60 100 ns

R

L

=3to7KΩ CL=2500pF

(Note 6, See Figure 3, 4)

1.7 2.5 µs

t

THL

Transition Time High to Low Level
Output

R

L

=3to7KΩCL=15pF

(See Figure 3, 4)

40 7.5 ns

R

L

=3to7KΩ CL=2500pF

(Note 6, See Figure 3, 4)

1.5 2.5 µs

NOTE6: Measured between-3Vand3V pointsofoutputwaveform(EIA-232-Econditions), allunusedinputsare tied.

RECEIVER SWITCHINGCHARACTERISTICS

(V

DD

= 12V, VSS= -12V,VCC=5V TA=25oC)

Symb ol Parameter Test C o n dit i ons Val ue Unit

Min. Typ. M ax.

t

PLH

Propagation Delay Time, Low to High
Level Output

R

L

=5KΩ CL=50pF

(See Figure 6)

400 1000

ns

t

PHL

Propagation Delay Time High to Low
Level Output

R

L

=5KΩCL=50pF

(See Figure 6)

70 150 ns

t

TLH

Transition Time Low to High Level
Output

R

L

=5KΩ CL=50pF

(See Figure 6)

200 525 ns

t

THL

Transition Time High to Low Level
Output

R

L

=5KΩ CL=50pF

(See Figure 6)

20 60 ns

ST75185

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APPLICATION CIRCUITS

To CPU

RI

5

1

2

3

4

9

6

7

8

GND

DCD
DSR

RXD
RTS

TXD
CTS
DTR

Rin1

Rin5

Rin4

Rin3

Rin2

Dout3

Dout2

Dout1

Rout1

Rout5

Rout4

Rout3

Rout2

Din1

Din3

Din2

1

Vss

GND

2

Vcc

Vdd

ST75185

20

19

9

7

6

5

4

3

14

13

8

10

18

11

12

17

16

15

Vcc
+5V

Vdd
+12 V

Vss

-12V

Dib9 Serial Port Connector

RS232 LEVEL

TTL LEVEL

PC Serial Port

100nF

100nF

100nF

C

L

CL

CL

UART

(16550)

DCD 38

DSR 37

DTR 33

TXD 11

RXD 21

CTS 36

RTS 32

RI 39

FIGURE1: Driver Test Circuitfor VOH,VOL,
I

SO(H)

and I

SO(L)

FIGURE2: Driver Test Circuitfor IIHandI

IL

ST75185

6/12

FIGURE3:

DriverTest Circuit

FIGURE4:

Driver VoltageWaveforms

FIGURE5: Receiver Test Circuit for I

OS

FIGURE6: Receiver Test Circuit for VT,VOH,V

OL

NOTEA:Thepulsegenerator has thefollowingcharacteristics: t

W

=25µs,PRR= 20KHz,ZO=50Ω,tr=tf<50ns.

NOTEB:C

L

includesprobeandjigcapacitance.

FIGURE7: Receiver Test Circuit FIGURE8: Receiver VoltageWaveforms

ST75185

7/12

DriverVoltage Transfer Characteristics

DriverShort Circuit OutputCurrent vs Free-Air
Temperature

DeviceSupply Current vsTemperature

DriverOutput Current vs OutputVoltage

DriverOutput Slew Rate vs LoadCapacitance

ReceiverThresholdvs Temperature

ST75185

8/12

ReceiverThresholdvs Supply Voltage

+V

-V

ST75185

Output

Lowimpedance
in the power off
condition.

ST75185

Output

Outputshorted
to ±15V

DD

SS

APPLICATION INFORMATION: DIODESON POWERSUPPLY

Diodes placed in series with the V

DD

and VSSleads protect the ST75185 in the fault condition in which
the devices output are shorted to±15V and the power supplies are at low state and provide
low-impedancepath toground (see Figure below)

ST75185

9/12

DIM.

mm inch

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

a1 0.254 0.010

B 1.39 1.65 0.055 0.065
b 0.45 0.018

b1 0.25 0.010

D 25.4 1.000
E 8.5 0.335
e 2.54 0.100

e3 22.86 0.900

F 7.1 0.280

I 3.93 0.155
L 3.3 0.130
Z 1.34 0.053

P001J

Plastic DIP-20 (0.25) MECHANICAL DATA

ST75185

10/12

DIM.

mm inch

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

A 2.65 0.104

a1 0.10 0.20 0.004 0.007
a2 2.45 0.096

b 0.35 0.49 0.013 0.019

b1 0.23 0.32 0.009 0.012

C 0.50 0.020

c1 45 (typ.)

D 12.60 13.00 0.496 0.512
E 10.00 10.65 0.393 0.419
e 1.27 0.050

e3 11.43 0.450

F 7.40 7.60 0.291 0.299
L 0.50 1.27 0.19 0.050

M 0.75 0.029

S 8 (max.)

P013L

SO-20 MECHANICAL DATA

ST75185

11/12

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are not authorized for use as critical components in lifesupport devices or systems withoutexpress written approval of STMicroelectronics.

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ST75185

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