ST75185C
Multiple RS-232 drivers and receivers
Features
■
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
SO-20
TSSOP20
Description
The ST75185C 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 ST75185C
provides a rugged low-cost solution for this
function at the expense of quiescent power and
external passive components relative to the
ST75C185.
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 ST75185C is characterized for operation over
the range of 0°C to 70 °C.
The ST75185C 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 20 k-bits/s. The
switching speeds of the ST75185C are fast
enough to support rates up to 120 K-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 inter-operability at signalling rates to
Table 1.
Device summary
Order codes
Temperature range
Packages
Packaging
ST75185CTR
0 to 70 °C
TSSOP20 (tape and reel)
2500 parts per reel
ST75185CDR
0 to 70 °C
SO-20 (tape and reel)
1000 parts per reel
April 2009
Doc ID 6228 Rev 18
1/22
www.st.com
22
Contents
ST75185C
Contents
1
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5
Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6
Application information: diodes on power supply . . . . . . . . . . . . . . . . 15
7
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
8
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
2/22
Doc ID 6228 Rev 18
ST75185C
Pin configuration
1
Pin configuration
Figure 1.
Pin connection IEC logic symbol and logic diagram
Table 2.
Pin description
Pin n°
Symbol
Name and function
1
VDD
Supply voltage (+12 V)
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
Fourth receiver input
8
DY3
Third driver output
9
RA5
Fifth receiver input
10
VSS
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
VCC
Supply voltage (+5 V)
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3/22
Maximum ratings
ST75185C
2
Maximum ratings
Table 3.
Absolute maximum ratings over operating free-air temperature range
Symbol
Parameter
Value
Unit
VDD
Supply voltage (1)
15
V
VSS
Supply voltage
(1)
-15
V
VCC
Supply voltage (1)
10
V
VI
Input voltage range (Driver)
-15 to 7
V
VI
Input voltage range (Receiver)
-30 to 30
V
VO
Output voltage range (Driver)
-15 to 15
V
IO
Receiver low level output current
20
mA
PD
Continuous total power dissipation
TA
Operating free-air temperature range
TSTG
See dissipation rating table
Storage temperature range
Lead temperature 1.6 mm. from case for 10 sec.
TL
0 to 70
°C
-65 to + 150
°C
260
°C
1. All voltage are with respect to the network ground terminal.
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
Table 4.
Dissipation rating table
Package
Power rating
at TA ≤ 25°C
Derating factor
above TA = 25°C
Power rating
at TA ≤ 70°C
MICROPACKAGE (D)
1125 mW
9.0 mW/°C
720 mW
Table 5.
Symbol
Thermal data
Parameter
RthJC
Thermal resistance junction-case
RthJA
Thermal resistance junction-ambient
1. This value is referred to single-layer PCB, JEDEC standard test board.
4/22
Doc ID 6228 Rev 18
TSSOP20
Unit
27.22
°C/W
114.5 (1)
°C/W
ST75185C
Table 6.
Maximum ratings
Recommended operating conditions
Symbol
Parameter
Min.
Max.
Unit.
VDD
Supply voltage
7.5
15
V
VSS
Supply voltage
-7.5
-15
V
VCC
Supply voltage
4.5
5.5
V
0
VCC
V
VI
Driver input voltage
IOH
High level output current
IOL
Low level output current
TA
Operating free-air temperature range
Driver
-6
mA
Receiver
-0.5
Driver
6
Receiver
16
mA
Doc ID 6228 Rev 18
0
70
°C
5/22
Electrical characteristics
ST75185C
3
Electrical characteristics
Table 7.
Supply currents
Test conditions
Symbol
IDD
ISS
ICC
6/22
Value
Parameter
Supply current from VDD
Supply current from VSS
Supply current from VCC
Unit
VDD
VSS
9
-9
12
-12
15
-15
9
-9
12
-12
15
-15
9
-9
12
-12
15
-15
9
-9
12
-12
15
-15
Min.
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
No load. All inputs at 5V
VCC = 5V
Doc ID 6228 Rev 18
Typ.
Max.
15
19
mA
25
4.5
5.5
mA
9
-15
-19
mA
-25
-3.2
-3.2
mA
-3.2
30
mA
ST75185C
Electrical characteristics
VDD = 9 V, VSS = -9 V, VCC = 5 V, unless otherwise specified.
Table 8.
Driver electrical characteristics over operating free-air temperature range
Value
Symbol
Parameter
Test conditions
VOH
High level output voltage
VIL = 0.8 V, RL = 3kΩ
(See Figure 3)
VOL
Low level output voltage
(Note 3)
VIH = 1.9 V, RL = 3kΩ
(See Figure 3)
IIH
High level input current
IIL
Unit
Min.
Typ.
6
7.5
Max.
V
-6
V
VI = 5 V (See Figure 4)
10
µA
Low level input current
VI = 0 V (See Figure 4)
−1.6
mA
IOS(H)
High level short circuit
output current (Note 4)
VIL = 0.8 V, VO = 0 V
(See Figure 3)
-4.5
−12
−19.5
mA
IOS(L)
Low level short circuit output VIH = 2 V VO = 0 V
current
(See Figure 3)
4.5
12
19.5
mA
Output resistance
RO
Note:
VDD = VSS = VCC = 0 V
VO = -2 to 2 V (Note 3)
-7.5
Ω
300
1
The algebraic convention, where the more positive (less negative) limits designated as
maximum, is used in this datasheet for logic levels only (e.g. if - 10 V is a maximum, the
typical value is a more negative voltage).
2
Output short circuit conditions must maintain the total power dissipation below absolute
maximum ratings.
3
Test conditions are those specified by EIA-232-E and as listed above.
VDD = 12 V, VSS = -12 V, VCC = 5 V, TA = 25 °C
Table 9.
Driver switching characteristics
Value
Symbol
Parameter
Test conditions
Unit
Min.
Typ.
Max.
tPLH
Propagation Delay Time, Low to
High Level Output
RL = 3 to 7 kΩ CL = 15 pF
(See Figure 5, Figure 6)
315
500
ns
tPHL
Propagation Delay Time, High to
Low Level Output
RL = 3 to 7 kΩ CL = 15 pF
(See Figure 5, Figure 6)
75
175
ns
RL = 3 to 7 kΩ CL = 15 pF
(See Figure 5, Figure 6)
60
100
ns
tTLH
Transition Time Low to High Level
Output
RL = 3 to 7 kΩ CL = 2500 pF
(Note 4, Figure 5, Figure 6)
1.7
2.5
µs
RL = 3 to 7 kΩ CL = 15 pF
(See Figure 5, Figure 6)
40
7.5
ns
RL = 3 to 7 kΩ CL = 2500 pF
(Note 4, Figure 5, Figure 6)
1.5
2.5
µs
Transition Time High to Low Level
Output
tTHL
4
Measured between -3 V and 3 V points of output waveform (EIA-232-E conditions), all
unused inputs are tied.
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7/22
Electrical characteristics
Table 10.
ST75185C
Receiver electrical characteristics over operating conditions
Value
Symbol
Parameter
Test conditions
Unit
Min.
VT+
Positive going threshold voltage
(See Figure 9)
VT-
Negative going threshold voltage
TA = 25 °C (See Figure 9)
Vhys
Input hysteresis (VT+ - VT-)
VOH
High level output voltage
VOL
Low level output voltage
IIH
High level input current
IIL
Low level input current
IOS
Short-circuit output current
Note:
0.75
Typ.
Max.
2.2
2.4
0.97
V
0.5
IOH = -0.5mA
VI = 3 V
VIH = 0.75 V
2.6
Inputs Open
2.6
V
4
5
V
IOL = 10 mA
0.2
VI = 25 V (See Figure 9)
3.6
VI = 3 V
(See Figure 9)
0.43
VI = -25 V (See Figure 9)
-3.6
VI = -3 V
-0.43
(See Figure 9)
V
0.45
V
8.3
mA
-8.3
mA
VI = 0 V VO = 0 V
(See Figure 7)
-3.4
-12
mA
All typical values are at TA = 25 °C, VCC = 5 V, VDD = 9 V and VSS = -9 V
VDD = 12 V, VSS = -12 V, VCC = 5 V TA = 25 °C
Table 11.
Receiver switching characteristics
Value
Symbol
Parameter
Test conditions
Unit
Min.
Typ.
Max.
tPLH
Propagation delay time low to high
level output
RL = 5 kΩ CL = 50 pF
(See Figure 9)
400
1000
ns
tPHL
Propagation delay time high to low
level output
RL = 5 kΩ CL = 50 pF
(See Figure 9)
70
150
ns
tTLH
Transition time low to high level
output
RL = 5 kΩ CL = 50 pF
(See Figure 9)
200
525
ns
tTHL
Transition time high to low level
output
RL = 5 kΩ CL = 50 pF
(See Figure 9)
20
60
ns
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Doc ID 6228 Rev 18
ST75185C
Typical application
4
Typical application
Figure 2.
Application circuits
Figure 3.
Driver test circuit for VOH, ISO(H) and ISO(L)
Doc ID 6228 Rev 18
9/22
Typical application
ST75185C
Figure 4.
Driver test circuit for IIH and IIL
Figure 5.
Driver test circuit
Figure 6.
Driver voltage waveforms
10/22
Doc ID 6228 Rev 18
ST75185C
Typical application
Figure 7.
Receiver test circuit for IOS
Figure 8.
Receiver test circuit for VT, VOH, VOL
Figure 9.
Receiver test circuit
Doc ID 6228 Rev 18
11/22
Typical application
ST75185C
Figure 10. Receiver voltage waveforms
Note:
12/22
1
The pulse generator has the following characteristics: tW = 25 µs, PRR = 20 kHz,
ZO = 50 Ω, tr = tf < 50 ns
2
CL includes probe and jig capacitance.
Doc ID 6228 Rev 18
ST75185C
5
Typical characteristics
Typical characteristics
Figure 11. Driver voltage transfer
characteristics
Figure 12. Driver short circuit output current
vs. free-air temperature
Figure 13. Device supply current vs.
temperature
Figure 14. Driver output current vs. output
voltage
Doc ID 6228 Rev 18
13/22
Typical characteristics
ST75185C
Figure 15. Driver output slew rate vs. load
capacitance
Figure 16. Receiver threshold vs. temperature
Figure 17. Receiver threshold vs. supply
voltage
14/22
Doc ID 6228 Rev 18
ST75185C
6
Application information: diodes on power supply
Application information: diodes on power supply
Diodes placed in series with the VDD and VSS leads protect the ST75185C in the fault
condition in which the devices output are shorted to ±15 V and the power supplies are at low
state and provide low-impedance path to ground (see Figure 18).
Figure 18. Diodes on power supply
Doc ID 6228 Rev 18
15/22
Package mechanical data
7
ST75185C
Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
16/22
Doc ID 6228 Rev 18
ST75185C
Package mechanical data
SO-20 mechanical data
Dim.
mm.
Min.
Typ.
inch.
Max.
Min.
Typ.
Max.
A
2.35
2.65
0.093
0.104
A1
0.1
0.30
0.004
0.012
B
0.33
0.51
0.013
0.020
C
0.23
0.32
0.009
0.013
D
12.60
13.00
0.496
0.512
E
7.4
7.6
0.291
0.299
e
1.27
0.050
H
10.00
10.65
0.394
0.419
h
0.25
0.75
0.010
0.030
L
0.4
1.27
0.016
0.050
k
0°
8°
0°
8°
ddd
0.100
0.004
0016022D
Doc ID 6228 Rev 18
17/22
Package mechanical data
ST75185C
TSSOP20 mechanical data
mm.
inch.
Dim.
Min.
Typ.
Max.
A
Min.
Typ.
Max.
1.2
A1
0.05
A2
0.8
b
0.047
0.15
0.002
0.004
0.006
1.05
0.031
0.039
0.041
0.19
0.30
0.007
0.012
c
0.09
0.20
0.004
0.0079
D
6.4
6.5
6.6
0.252
0.256
0.260
E
6.2
6.4
6.6
0.244
0.252
0.260
E1
4.3
4.4
4.48
0.169
0.173
0.176
1
e
0.65 BSC
K
0°
L
0.45
A
0.0256 BSC
0.60
8°
0°
0.75
0.018
8°
0.024
0.030
A2
A1
b
K
e
L
E
c
D
E1
PIN 1 IDENTIFICATION
1
0087225C
18/22
Doc ID 6228 Rev 18
ST75185C
Package mechanical data
Tape & reel SO-20 mechanical data
mm.
inch.
Dim.
Min.
A
Typ.
Max.
Min.
330
Max.
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
13.2
Typ.
0.504
30.4
0.519
1.197
Ao
10.8
11
0.425
0.433
Bo
13.2
13.4
0.520
0.528
Ko
3.1
3.3
0.122
0.130
Po
3.9
4.1
0.153
0.161
P
11.9
12.1
0.468
0.476
Doc ID 6228 Rev 18
19/22
Package mechanical data
ST75185C
Tape & reel TSSOP20 mechanical data
mm.
inch.
Dim.
Min.
A
Max.
Min.
330
13.2
Typ.
Max.
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
20/22
Typ.
0.504
22.4
0.519
0.882
Ao
6.8
7
0.268
0.276
Bo
6.9
7.1
0.272
0.280
Ko
1.7
1.9
0.067
0.075
Po
3.9
4.1
0.153
0.161
P
11.9
12.1
0.468
0.476
Doc ID 6228 Rev 18
ST75185C
Revision history
8
Revision history
Table 12.
Document revision history
Date
Revision
Changes
28-Apr-2006
15
Order codes updated.
01-Jun-2006
16
Modified: Figure 2.
19-Dec-2007
17
Added: Table 5.
07-Apr-2009
18
Modified Table 5 on page 4.
Doc ID 6228 Rev 18
21/22
ST75185C
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Doc ID 6228 Rev 18
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