®
ST75185
MULTIPLE RS-232 DRIVERS AND RECEIVERS
s
s
s
s
MEETS AND EXCEEDS THE
REQUIREMENTS OF EIA/TIA-232-E AND
ITUV.28 STANDARD
SINGLE CHIP WITH EASY INTERFACE
BETWEEN UART AND SERIAL PORT
CONNECTOR OF IBM PC/AT™ AND
COMPATIBLES
DESIGNED TO SUPPORT DATA RATES UP
TO 120 Kbps
PINOUT COMPATIBLE WITH ST75C185
N
D
(Plastic Package)
(Micro Package)
ORDER CODES :
ST75185CN
ST75185CD
standards. These standards are for data
interchange between a host computer and
peripheral at signalling rates up to 20k-bits/s. The
switching speeds 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
C to 70
o
C.
DESCRIPTION
The ST75185 contains three drivers and five
receivers. The pinout matches the DB9S
connector design in order to decrease the part
count, reduce the board space required and allow
easy interconnection of the UART and serial port
connector of 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 (formally CCITT) v.28
PIN CONNECTION IEC LOGIC SYMBOL AND LOGIC DIAGRAM
June 2000
1/12
ST75185
ORDER CODES
T ype
ST75185CN
ST75185CD
ST75185CDR
T emp eratu re Range
0 to 70 C
0 to 70 C
0 to 70 C
o
o
o
Package
DIP-20
SO-20 (Tube)
SO-20 (Tape & Reel)
Comments
20 parts per tube / 50 tubes per box
40 parts per tube / 25 tubes per box
1000 parts per reel
PIN DESCRIPTION
PIN No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
SYMBOL
V
DD
RA1
RA2
RA3
DY1
DY2
RA4
DY3
RA5
V
SS
GND
RY5
DA3
RY4
DA2
DA1
RY3
RY2
RY1
V
CC
NAME AND F UNCTIO N
Supply Voltage (+12V)
First Receiver Input
Second Receiver Input
Third Receiver Input
First Driver Output
Second Driver Output
FourthReceiver Input
Third Driver Output
Fifth Receiver Input
Supply Voltage (-12V)
Ground
Fifth Receiver Output
Third Driver Input
Fourth Receiver Output
Second Driver Input
First Driver Input
Third Receiver Output
Second Receiver Output
First Receiver Output
Supply Voltage (+5V)
2/12
ST75185
ABSOLUTE MAXIMUM RATINGS OVER OPERATING FREE-AIR TEMPERATURE RANGE
(unless otherwise specified)
Symbol
V
DD
V
SS
V
CC
V
I
V
I
V
O
I
O
P
D
T
A
T
stg
T
L
Parameter
Supply Voltage (Note 1)
Supply Voltage (Note 1)
Supply Voltage (Note 1)
Input Voltage Range (DRIVER)
Input Voltage Range (RECEIVER)
Output Voltage Range (DRIVER)
Receiver Low Level Output Current
Continuous Total Power Dissipation
Operating Free-Air Temperature Range
Storage Temperature Range
Lead Temperature 1.6mm from case for 10 sec
Value
15
-15
10
-15 to 7
-30 to 30
-15 to 15
20
See Dissipation Rating Table
0 to 70
-65 to +150
260
o
o
o
Unit
V
V
V
V
V
V
mA
C
C
C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
NOTE1:All voltage are with respect to the network ground terminal.
DISSIPATION RATING TABLE
Packag e
MICROPACKAGE (D)
DIP (N)
Po wer Rating
at T
A
≤
25
o
C
1125 mW
1150 mW
Derating Factor
above T
A
= 25
o
C (*)
9.0 mW/
o
C
9.2 mW/
o
C
Po wer Rating
at T
A
≤
70
o
C
720 mW
736 mW
(*) This is the reverse of the traditional junction-case thermal resistance R
tJ-C
RECOMMENDED OPERATING CONDITIONS
Symbol
V
DD
V
SS
V
CC
V
IN
I
OH
I
OL
T
A
Supply Voltage
Supply Voltage
Supply Voltage
Driver Input Voltege
High Level Output Current
Low Level Output Current
Operating Free-Air Temperature
DRIVER
RECEIVER
DRIVER
RECEIVER
0
Parameter
Min
7.5
-7.5
4.5
0
Max
15
-15
5.5
V
CC
-6
-0.5
6
16
70
o
Unit
V
V
V
V
mA
mA
C
3/12
ST75185
SUPPLY CURRENTS
Symb ol
I
DD
Parameter
V
DD
Supply Current from V
DD
9
12
15
9
12
15
I
SS
Supply Current from V
SS
9
12
15
9
12
15
I
CC
Supply Current from V
CC
Test Con dition s
V
SS
-9
-12
-15
-9
-12
-15
-9
-12
-15
-9
-12
-15
No load.
All inputs at
1.9V
No load.
All inputs at
0.8V
No load.
All inputs at
1.9V
No load.
All inputs at
0.8V
Min .
Value
T yp.
Max.
15
19
25
4.5
5.5
9
-15
-19
-25
-3.2
-3.2
-3.2
30
mA
mA
mA
mA
mA
Un it
No load. All inputs at 5V
V
CC
= 5V
DRIVER ELECTRICAL CHARACTERISTICS OVER OPERATING FREE-AIR TEMPERATURE
RANGE
(V
DD
= 9V, V
SS
= -9V, V
CC
= 5V, unless otherwise specified)
Symb ol
V
OH
V
OL
I
IH
I
IL
I
OS(H)
I
OS(L)
R
O
Parameter
High Level Output Voltage
Low Level Output Voltage (Note 3)
High Level Input Current
Low Level Input Current
High Level Short Circuit Output Current
(Note 4)
Low Level Short Circuit Output Current
Output Resistance
Test Con dition s
Min .
V
IL
= 0.8 V R
L
= 3KΩ
(See Figure 1)
V
IH
= 1.9 V R
L
= 3KΩ
(See Figure 1)
V
I
= 5 V (See Figure 2)
V
I
= 0 V (See Figure 2)
V
IL
= 0.8 V V
O
= 0 V
(See Figure 1)
V
IH
= 2 V V
O
= 0 V
(See Figure 1)
V
DD
= V
SS
= V
CC
= 0 V
V
O
= -2 to 2 V (Note 5)
-4.5
4.5
300
-12
12
6
Value
T yp.
7.5
-7.5
-6
10
-1.6
-19.5
19.5
Max.
V
V
µ
A
mA
mA
mA
Ω
Un it
NOTE 3:
The algebraic convention, where the more positive (less negative) limitis designated as maximum, is used in this datasheet for logic levels only
(e.g. if -10V is a maximum, the typical value is a more negative voltage).
NOTE 4:
Output short circuit conditions must mantain the total power dissipation below absolute maximum ratings.
NOTE 5:
Testconditions are those specified by EIA-232-E and as listed above.
4/12
ST75185
DRIVER SWITCHING CHARACTERISTICS
(V
DD
= 12V, V
SS
= -12V, V
CC
= 5V T
A
= 25
o
C)
Symb ol
t
PLH
t
PHL
t
TLH
Parameter
Propagation Delay Time, Low to High
Level Output
Propagation Delay Time High to Low
Level Output
Transition Time Low to High Level
Output
Test Con dition s
Min .
R
L
= 3 to 7 KΩ C
L
= 15 pF
(See Figures 3, 4)
R
L
= 3 to 7 K
Ω
C
L
= 15 pF
(See Figures 3, 4)
R
L
= 3 to 7 KΩ C
L
= 15 pF
(See Figures 3, 4)
R
L
= 3 to 7 KΩ C
L
= 2500 pF
(Note 6, See Figure 3, 4)
t
THL
Transition Time High to Low Level
Output
R
L
= 3 to 7 K
Ω
C
L
= 15 pF
(See Figure 3, 4)
R
L
= 3 to 7 KΩ C
L
= 2500 pF
(Note 6, See Figure 3, 4)
NOTE 6:
Measured between -3V and 3V points of output waveform (EIA-232-E conditions), all unused inputs are tied.
Value
T yp.
315
75
60
1.7
40
1.5
Max.
500
175
100
2.5
7.5
2.5
Un it
ns
ns
ns
µs
ns
µs
RECEIVER ELECTRICAL CHARACTERISTICS OVER OPERATING CONDITIONS
Symb ol
V
T+
V
T-
V
hys
V
OH
V
OL
I
IH
I
IL
I
OS
Parameter
Positive Going Threshold Voltage
Negative Going Threshold Voltage
Input Hysteresis (V
T+
- V
T-
)
High Level Output Voltage
Low Level Output Voltage
High Level Input Current
Low Level Input Current
Short-Circuit Output Current
I
OH
= -0.5mA
V
I
= 3 V
V
I
= 25 V
V
I
= 3 V
V
I
= -25 V
V
I
= -3 V
V
IH
= 0.75 V
Inputs Open
I
OL
= 10 mA
(See Figure 6)
(See Figure 6)
(See Figure 6)
(See Figure 6)
3.6
0.43
-3.6
-0.43
-3.4
-12
mA
-8.3
mA
Test Con dition s
Min .
(See Figure 6)
T
A
= 25
o
C (See Figure 6)
0.75
0.5
2.6
2.6
0.2
0.45
8.3
4
5
Value
T yp.
2.2
0.97
Max.
2.4
V
V
V
V
V
mA
Un it
V
I
= 0 V
V
O
= 0 V
(See Figure 5)
Alltypical values are at T
A
= 25
o
C, V
CC
= 5V, V
DD
= 9Vand V
SS
= -9V
RECEIVER SWITCHING CHARACTERISTICS
(V
DD
= 12V, V
SS
= -12V, V
CC
= 5V T
A
= 25
o
C)
Symbo l
t
PLH
t
PHL
t
TLH
t
THL
Parameter
Propagation Delay Time, Low to High
Level Output
Propagation Delay Time High to Low
Level Output
Transition Time Low to High Level
Output
Transition Time High to Low Level
Output
T est Cond ition s
Min.
R
L
= 5 KΩ C
L
= 50 pF
(See Figure 6)
R
L
= 5 K
Ω
C
L
= 50 pF
(See Figure 6)
R
L
= 5 KΩ C
L
= 50 pF
(See Figure 6)
R
L
= 5 KΩ C
L
= 50 pF
(See Figure 6)
Value
Typ .
400
70
200
20
Max.
1000
150
525
60
ns
ns
ns
ns
Unit
5/12
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