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ST75185
Multiple RS-232 drivers and receivers
General 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/ATTM and compatibles Designed to support data rates up to 120kbps Pinout compatible with ST75C185
SO-20 TSSOP20

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/ATTM 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 Kbits/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 0C to 70C.
Order code
Part number ST75185CTR ST75185CDR Temperature range 0 to 70 C 0 to 70 C Package TSSOP20 (Tape & Reel) SO-20 (Tape & Reel) Packaging 2500 parts per reel 1000 parts per reel
June 2006
Rev 16
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www.st.com
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Contents
ST75185
Contents
1 2 3 4 5 6 7 8 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Application information: diodes on power supply . . . . . . . . . . . . . . . . 14 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
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ST75185
Pin configuration
1
Figure 1.
Pin configuration
Pin connection IEC logic symbol and logic diagram
Table 1.
Pin description
Pin N 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Symbol VDD RA1 RA2 RA3 DY1 DY2 RA4 DY3 RA5 VSS GND RY5 DA3 RY4 DA2 DA1 RY3 RY2 RY1 VCC Name and function Supply voltage (+12V) First receiver input Second receiver input Third Receiver Input First driver output Second driver output Fourth receiver 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) 3/21
Maximum ratings
ST75185
2
Table 2.
Symbol VDD VSS VCC VI VI VO IO PD TA TSTG TL
Maximum ratings
Absolute maximum ratings over operating free-air temperature range
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 C C C Unit V V V V V V mA
Note: Note:
Table 3.
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. 1 All voltage are with respect to the network ground terminal.
Dissipation rating table
Package Power rating at TA 25C 1125 mW Derating factor (1) above TA = 25C 9.0 mW/C Power rating at TA 70C 720 mW
MICROPACKAGE (D)
1. This is the reverse of the traditional junction-case thermal resistance RtJ-C
Table 4.
Symbol VDD VSS VCC VI IOH
Recommended operating conditions
Parameter Supply voltage Supply voltage Supply voltage Driver input voltage Driver High level output current Receiver Driver Low level output current Receiver Operating free-air temperature range 0 16 70 C -0.5 6 mA Min 7.5 -7.5 4.5 0 Max 15 -15 5.5 VCC -6 mA Unit V V V V
IOL TA
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ST75185
Electrical characteristics
3
Table 5.
Symbol
Electrical characteristics
Supply currents
Test Conditions Parameter VDD 9 12 15 IDD Supply current from VDD 9 12 15 9 12 15 ISS Supply current from VSS 9 12 15 ICC Supply current from VCC VSS -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. Typ. Max. 15 19 25 4.5 5.5 9 -15 -19 -25 -3.2 -3.2 -3.2 30 mA mA mA mA mA Value Unit
No load. All inputs at 5V VCC = 5V
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Electrical characteristics Table 6. Driver electrical characteristics over operating free-air temperature range (VDD = 9V, VSS = -9V, VCC = 5V, unless otherwise specified)
Value Symbol Parameter Test Conditions Min. VOH VOL IIH IIL IOS(H) IOS(L) RO 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 VIL = 0.8 V, RL = 3K (See Figure 3.) VIH = 1.9 V, RL = 3K (See Figure 3.) VI = 5 V (See Figure 4.) VI = 0 V (See Figure 4.) VIL = 0.8 V, VO = 0 V (See Figure 3.) VIH = 2 V VO = 0 V (See Figure 3.) VDD = VSS = VCC = 0 V VO = -2 to 2 V (Note 5) -4.5 4.5 300 - 12 12 6 Typ. 7.5 -7.5 -6 10 - 1.6 - 19.5 19.5 Max.
ST75185
Unit
V V A mA mA mA W
Note:
3
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 - 10V is a maximum, the typical value is a more negative voltage). Output short circuit conditions must maintain the total power dissipation below absolute maximum ratings. Test conditions are those specified by EIA-232-E and as listed above.
Driver switching characteristics (VDD = 12V, VSS = -12V, VCC = 5V, TA = 25 C)
Value Parameter Propagation Delay Time, Low to High Level Output Propagation Delay Time, High to Low Level Output Test Conditions Min. Typ. 315 75 60 1.7 40 1.5 Max. 500 175 100 2.5 7.5 2.5 ns ns ns s ns s RL = 3 to 7 K CL = 15 pF (See Figure 5, Figure 6) RL = 3 to 7 K CL = 15 pF (See Figure 5, Figure 6) RL = 3 to 7 K CL = 15 pF (See Figure 5, Figure 6) RL = 3 to 7 K CL = 2500 pF (Note 6, Figure 5, Figure 6) RL = 3 to 7 K CL = 15 pF (See Figure 5, Figure 6) RL = 3 to 7 K CL = 2500 pF (Note 6, Figure 5, Figure 6) Unit
4 5
Table 7.
Symbol
tPLH tPHL
tTLH
Transition Time Low to High Level Output
tTHL
Transition Time High to Low Level Output
6
Measured between -3V and 3V points of output waveform (EIA-232-E conditions), all unused inputs are tied.
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ST75185
Electrical characteristics
Table 8.
Symbol VT+ VTVhys VOH VOL IIH
Receiver electrical characteristics over operating conditions
Value Parameter Positive Going Threshold Voltage Negative Going Threshold Voltage Input Hysteresis (VT+ - VT-) High Level Output Voltage Low Level Output Voltage High Level Input Current IOH = -0.5mA VI = 3 V VIH = 0.75 V Inputs Open Test Conditions Min. (See Figure 9) TA = 25 C (See Figure 9) 0.75 0.5 2.6 2.6 0.2 3.6 0.43 -3.6 -0.43 -3.4 -12 mA -8.3 mA 0.45 8.3 mA V 4 5 V Typ. 2.2 0.97 Max. 2.4 V V V Unit
IOL = 10 mA
VI = 25 V (See Figure 9) VI = 3 V (See Figure 9)
IIL IOS
Low Level Input Current
VI = -25 V (See Figure 9) VI = -3 V (See Figure 9)
Short-Circuit Output Current
VI = 0 V VO = 0 V (See Figure 7)
Note:
Table 9.
All typical values are at TA = 25C, VCC = 5V, VDD = 9V and VSS=-9V
Receiver switching characteristics (VDD = 12V, VSS = -12V, VCC = 5V TA = 25C)
Value 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 Test Conditions Min. Typ. 400 70 200 20 Max. 1000 150 525 60 ns ns ns ns RL = 5 K CL = 50 pF (See Figure 9) RL = 5 K CL = 50 pF (See Figure 9) RL = 5 K CL = 50 pF (See Figure 9) RL = 5 K CL = 50 pF (See Figure 9) Unit
Symbol
tPLH tPHL tTLH tTHL
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Typical application
ST75185
4
Figure 2.
Typical application
Application circuits
Figure 3.
Driver test circuit for VOH, ISO(H) and ISO(L)
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ST75185
Typical application
Figure 4.
Driver test circuit for IIH and IIL
Figure 5.
Driver test circuit
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Typical application
ST75185
Figure 6.
Driver voltage waveforms
Figure 7.
Receiver test circuit for IOS
Figure 8.
Receiver test circuit for VT, VOH, VOL
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ST75185
Typical application
Figure 9.
Receiver test circuit
Figure 10. Receiver voltage waveforms
Note:
1 2
The pulse generator has the following characteristics: tW = 25s, PRR = 20KHz, ZO = 50 , tr = tf < 50ns CL includes probe and jig capacitance.
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Typical characteristics
ST75185
5
Typical characteristics
Figure 12. Driver short circuit output current vs. free-air temperature
Figure 11. Driver voltage transfer characteristics
Figure 13. Device supply current vs temperature
Figure 14. Driver output current vs output voltage
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ST75185 Figure 15. Driver output slew rate vs load capacitance
Typical characteristics Figure 16. Receiver threshold vs temperature
Figure 17. Receiver threshold vs supply voltage
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Application information: diodes on power supply
ST75185
6
Application information: diodes on power supply
Diodes placed in series with the VDD and VSS leads 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-impedance path to ground (see Figure below).
Figure 18. Diodes on power supply
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ST75185
Package mechanical data
7
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a Lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com
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Package mechanical data
ST75185
SO-20 MECHANICAL DATA
DIM. A A1 B C D E e H h L k ddd 10.00 0.25 0.4 0 mm. MIN. 2.35 0.1 0.33 0.23 12.60 7.4 1.27 10.65 0.75 1.27 8 0.100 0.394 0.010 0.016 0 TYP MAX. 2.65 0.30 0.51 0.32 13.00 7.6 MIN. 0.093 0.004 0.013 0.009 0.496 0.291 0.050 0.419 0.030 0.050 8 0.004 inch TYP. MAX. 0.104 0.012 0.020 0.013 0.512 0.299
0016022D
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ST75185
Package mechanical data
TSSOP20 MECHANICAL DATA
mm. DIM. MIN. A A1 A2 b c D E E1 e K L 0 0.45 0.60 0.05 0.8 0.19 0.09 6.4 6.2 4.3 6.5 6.4 4.4 0.65 BSC 8 0.75 0 0.018 0.024 1 TYP MAX. 1.2 0.15 1.05 0.30 0.20 6.6 6.6 4.48 0.002 0.031 0.007 0.004 0.252 0.244 0.169 0.256 0.252 0.173 0.0256 BSC 8 0.030 0.004 0.039 MIN. TYP. MAX. 0.047 0.006 0.041 0.012 0.0079 0.260 0.260 0.176 inch
A
A2 A1 b e K c L E
D
E1
PIN 1 IDENTIFICATION
1
0087225C
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Package mechanical data
ST75185
Tape & Reel SO-20 MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 10.8 13.2 3.1 3.9 11.9 12.8 20.2 60 30.4 11 13.4 3.3 4.1 12.1 0.425 0.520 0.122 0.153 0.468 TYP MAX. 330 13.2 0.504 0.795 2.362 1.197 0.433 0.528 0.130 0.161 0.476 MIN. TYP. MAX. 12.992 0.519 inch
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ST75185
Package mechanical data
Tape & Reel TSSOP20 MECHANICAL DATA
mm. DIM. MIN. A C D N T Ao Bo Ko Po P 6.8 6.9 1.7 3.9 11.9 12.8 20.2 60 22.4 7 7.1 1.9 4.1 12.1 0.268 0.272 0.067 0.153 0.468 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.276 0.280 0.075 0.161 0.476 MIN. TYP. MAX. 12.992 0.519 inch
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Revision history
ST75185
8
Table 10.
Date
Revision history
Revision history
Revision 15 16 Changes Order codes has been updated and new template.
28-Apr-2006 01-Jun-2006
Figure 2. updated.
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ST75185
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