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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/ATTM 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/ATTM 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. 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 120 k-bits/s, use of EIA/ITA-423-B (ITU v.10) and Table 1. Device summary
Temperature range 0 to 70 °C 0 to 70 °C Package TSSOP20 (Tape and reel) SO-20 (Tape and reel) Packaging 2500 parts per reel 1000 parts per reel
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.
Order codes ST75185CTR ST75185CDR
December 2007
Rev 17
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Contents
ST75185C
Contents
1 2 3 4 5 6 7 8 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Application information: diodes on power supply . . . . . . . . . . . . . . . . 15 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
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ST75185C
Pin configuration
1
Figure 1.
Pin configuration
Pin connection IEC logic symbol and logic diagram
Table 2.
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) 3/22
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Maximum ratings
ST75185C
2
Table 3.
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 (1) Supply voltage
(1)
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
Unit V V V V V V mA
Supply voltage (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 1.6 mm. from case for 10 sec.
°C °C °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. Dissipation rating table
Package Power rating at TA ≤25°C 1125 mW Derating factor above TA = 25°C 9.0 mW/°C Power rating at TA ≤70°C 720 mW
Table 4.
MICROPACKAGE (D)
Table 5.
Symbol RthJC
Thermal data
Parameter Thermal resistance junction-case TSSOP20 27.22 Unit °C/W
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ST75185C
Maximum ratings
Table 6.
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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Electrical characteristics
ST75185C
3
Table 7.
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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ST75185C Table 8.
Electrical characteristics Driver electrical characteristics over operating free-air temperature range (VDD = 9 V, VSS = -9 V, VCC = 5 V, unless otherwise specified)
Value Parameter Test conditions Min. Typ. 7.5 -7.5 -6 10 − 1.6 -4.5 4.5 300 − 12 12 − 19.5 19.5 Max. V V µA mA mA mA Ω VIL = 0.8 V, RL = 3kΩ (See Figure 3) VIH = 1.9 V, RL = 3kΩ (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) Unit
Symbol
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)
6
Low level short circuit output VIH = 2 V VO = 0 V current (See Figure 3) Output resistance VDD = VSS = VCC = 0 V VO = -2 to 2 V (Note 3)
Note:
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). 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 = 12 V, VSS = -12 V, VCC = 5 V, 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 μs ns μs RL = 3 to 7 kΩ CL = 15 pF (See Figure 5, Figure 6) RL = 3 to 7 kΩ CL = 15 pF (See Figure 5, Figure 6) RL = 3 to 7 kΩ CL = 15 pF (See Figure 5, Figure 6) RL = 3 to 7 kΩ CL = 2500 pF (Note 4, Figure 5, Figure 6) RL = 3 to 7 kΩ CL = 15 pF (See Figure 5, Figure 6) RL = 3 to 7 kΩ CL = 2500 pF (Note 4, Figure 5, Figure 6) Unit
2 3 Table 9.
Symbol
tPLH tPHL
tTLH
Transition Time Low to High Level Output
tTHL
Transition Time High to Low Level Output
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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Electrical characteristics
ST75185C
Table 10.
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 11.
All typical values are at TA = 25 °C, VCC = 5 V, VDD = 9 V and VSS = -9 V Receiver switching characteristics (VDD = 12 V, VSS = -12 V, VCC = 5 V TA = 25 °C)
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 kΩ CL = 50 pF (See Figure 9) RL = 5 kΩ CL = 50 pF (See Figure 9) RL = 5 kΩ CL = 50 pF (See Figure 9) RL = 5 kΩ CL = 50 pF (See Figure 9) Unit
Symbol
tPLH tPHL tTLH tTHL
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ST75185C
Typical application
4
Figure 2.
Typical application
Application circuits
Figure 3.
Driver test circuit for VOH, ISO(H) and ISO(L)
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Typical application
ST75185C
Figure 4.
Driver test circuit for IIH and IIL
Figure 5.
Driver test circuit
Figure 6.
Driver voltage waveforms
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ST75185C
Typical application
Figure 7.
Receiver test circuit for IOS
Figure 8.
Receiver test circuit for VT, VOH, VOL
Figure 9.
Receiver test circuit
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Typical application
ST75185C
Figure 10. Receiver voltage waveforms
Note:
1 2
The pulse generator has the following characteristics: tW = 25 µs, PRR = 20 kHz, ZO = 50 Ω tr = tf < 50 ns , CL includes probe and jig capacitance.
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ST75185C
Typical characteristics
5
Typica
