ST75185
MULTIPLE RS-232 DRIVERS AND RECEIVERS
June 2000
s
MEETS AND EXCEEDS THE
REQUIREMENTS OF EIA/TIA-232-E AND
ITUV.28 STANDARD
s
SINGLE CHIP WITH EASY INTERFACE
BETWEEN UART AND SERIAL PORT
CONNECTOR OF IBM PC/AT
TM
AND
COMPATIBLES
s
DESIGNED TO SUPPORT DATA RATES UP
TO 120 Kbps
s
PINOUT COMPATIBLE WITH ST75C185
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
TM
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
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.
PIN CONNECTION IEC LOGIC SYMBOL AND LOGIC DIAGRAM
ORDER CODES :
ST75185CN
ST75185CD
D
(Micro Package)
N
(Plastic Package)
1/12
ORDER CODES
T ype
T emp eratu re Range
Package
Comments
ST75185CN
0 to 70
o
C
DIP-20
20 parts per tube / 50 tubes per box
ST75185CD
0 to 70
o
C
SO-20 (Tube)
40 parts per tube / 25 tubes per box
ST75185CDR
0 to 70
o
C
SO-20 (Tape & Reel)
1000 parts per reel
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND F UNCTIO N
1
V
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
2/12
ABSOLUTE MAXIMUM RATINGS OVER OPERATING FREE-AIR TEMPERATURE RANGE
(unless otherwise specified)
Symbol
Parameter
Val ue
Unit
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
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
Po wer Rati ng
at T
A
25
o
C
Derating Factor
above T
A
= 25
o
C (*)
Po wer Rati ng
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 the reverse of the traditional junction-case thermal resistance R
tJ-C
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Min
Max
Unit
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
SUPPLY CURRENTS
Symb ol
Parameter
Test Con dition s
Value
Un it
V
DD
V
SS
Min .
T yp.
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
DRIVER ELECTRICAL CHARACTERISTICS OVER OPERATING FREE-AIR TEMPERATURE
RANGE (V
DD
= 9V, V
SS
= -9V, V
CC
= 5V, unless otherwise specified)
Symb ol
Parameter
Test Con dition s
Value
Un it
Min .
T yp.
Max.
V
OH
High Level Output Voltage
V
IL
= 0.8 V
R
L
= 3K
(See Figure 1)
6
7.5
V
V
OL
Low Level Output Voltage (Note 3)
V
IH
= 1.9 V
R
L
= 3K
(See Figure 1)
-7.5
-6
V
I
IH
High Level Input Current
V
I
= 5 V (See Figure 2)
10
A
I
IL
Low Level Input Current
V
I
= 0 V (See Figure 2)
-1.6
mA
I
OS(H)
High Level Short Circuit Output Current
(Note 4)
V
IL
= 0.8 V V
O
= 0 V
(See Figure 1)
-4.5
-12
-19.5
mA
I
OS(L)
Low Level Short Circuit Output Current
V
IH
= 2 V V
O
= 0 V
(See Figure 1)
4.5
12
19.5
mA
R
O
Output Resistance
V
DD
= V
SS
= V
CC
= 0 V
V
O
= -2 to 2 V (Note 5)
300
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.
ST75185
4/12
RECEIVER ELECTRICAL CHARACTERISTICS OVER OPERATING CONDITIONS
Symb ol
Parameter
Test Con dition s
Value
Un it
Min .
T yp.
Max.
V
T+
Positive Going Threshold Voltage
(See Figure 6)
2.2
2.4
V
V
T-
Negative Going Threshold Voltage
T
A
= 25
o
C (See Figure 6)
0.75
0.97
V
V
hys
Input Hysteresis (V
T+
- V
T-
)
0.5
V
V
OH
High Level Output Voltage
I
OH
= -0.5mA
V
IH
= 0. 75 V
2.6
4
5
V
Inputs Open
2.6
V
OL
Low Level Output Voltage
V
I
= 3 V
I
OL
= 10 mA
0.2
0.45
V
I
IH
High Level Input Current
V
I
= 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
V
I
= -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
V
I
= 0 V
V
O
= 0 V
(See Figure 5)
-3.4
-12
mA
Alltypical values are at T
A
= 25
o
C, V
CC
= 5V, V
DD
= 9Vand V
SS
= -9V
DRIVER SWITCHING CHARACTERISTICS
(V
DD
= 12V, V
SS
= -12V, V
CC
= 5V T
A
= 25
o
C)
Symb ol
Parameter
Test Con dition s
Value
Un it
Min .
T yp.
Max.
t
PLH
Propagation Delay Time, Low to High
Level Output
R
L
= 3 to 7 K
C
L
= 15 pF
(See Figures 3, 4)
315
500
ns
t
PHL
Propagation Delay Time High to Low
Level Output
R
L
= 3 to 7 K
C
L
= 15 pF
(See Figures 3, 4)
75
175
ns
t
TLH
Transition Time Low to High Level
Output
R
L
= 3 to 7 K
C
L
= 15 pF
(See Figures 3, 4)
60
100
ns
R
L
= 3 to 7 K
C
L
= 2500 pF
(Note 6, See Figure 3, 4)
1.7
2.5
s
t
THL
Transition Time High to Low Level
Output
R
L
= 3 to 7 K
C
L
= 15 pF
(See Figure 3, 4)
40
7.5
ns
R
L
= 3 to 7 K
C
L
= 2500 pF
(Note 6, See Figure 3, 4)
1.5
2.5
s
NOTE 6: Measured between -3V and 3V points of output waveform (EIA-232-E conditions), all unused inputs are tied.
RECEIVER SWITCHING CHARACTERISTICS
(V
DD
= 12V, V
SS
= -12V, V
CC
= 5V T
A
= 25
o
C)
Symbo l
Parameter
T est Cond ition s
Value
Uni t
Min.
Typ .
Max.
t
PLH
Propagation Delay Time, Low to High
Level Output
R
L
= 5 K
C
L
= 50 pF
(See Figure 6)
400
1000
ns
t
PHL
Propagation Delay Time High to Low
Level Output
R
L
= 5 K
C
L
= 50 pF
(See Figure 6)
70
150
ns
t
TLH
Transition Time Low to High Level
Output
R
L
= 5 K
C
L
= 50 pF
(See Figure 6)
200
525
ns
t
THL
Transition Time High to Low Level
Output
R
L
= 5 K
C
L
= 50 pF
(See Figure 6)
20
60
ns
ST75185
5/12
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