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| ST75C176 Low power RS-485/RS-422 transceiver General features s s s s Low quiescent current: 300mA Designed for RS-485 interface applications -7V to 12V common mode input voltage range Driver maintains high impedance in 3-state or with the power OFF 70mV typical input hysteresis 30ns propagation delays, 5ns skew Operate from a single 5V supply Current limiting and thermal shutdown for driver overload protection Allows up to 32 transceivers on the bus Bic mos technology DIP-8 SO-8 s s s s s s It operates from a single 5V supply. Driver is short-circuit current limited and is protected against excessive power dissipation by thermal shutdown circuitry that placed the driver outputs into a high-impedance state. The receiver input has a fail safe feature that guarantees a logic-high output if the input is open circuit. The ST75C176 is designed for bi-directional data communications on multipoint bus transmission line (half-duplex applications). Description The ST75C176 is al low power transceiver for RS-485 and RS-422 communication. Each part contains one driver and one receiver. This transceiver draw 300mA (typ.) of supply current when unloaded or fully loaded with disabled drivers. Order code Part number ST75C176CN ST75C176BN ST75C176CDR ST75C176BDR May 2006 Temperature range 0 to 70 C -40 to 85 C 0 to 70 C -40 to 85 C Package DIP-8 DIP-8 SO-8 (Tape & Reel) SO-8 (Tape & Reel) Rev 3 Packaging 50parts per tube / 40tube per box 50parts per tube / 40tube per box 2500 parts per reel 2500 parts per reel 1/18 www.st.com 18 Contents ST75C176 Contents 1 2 3 4 5 6 7 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Test circuits and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2/18 ST75C176 Pin configuration 1 Figure 1. Pin configuration Pin connections Table 1. Pin n 1 2 3 4 5 6 7 8 Pin description Symbol RO RE DE DI GND A B VCC Receiver output Receiver output enable Driver output enable Driver input Ground Non-inverting receiver input and non-inverting driver output Inverting receiver input and inverting driver output Supply voltage Name and function 3/18 Truth tables ST75C176 2 Table 2. Truth tables Truth table (driver) Inputs RE X X X DE H H L DI H L X B L H Z Outputs A H L Z Note: Table 3. X= Don't care; Z=High impedance Truth table (receiver) Inputs Output A-B RE L L L H DE L L L L RO H L H Z +0.2V -0.2V INPUTS OPEN X Note: X= Don't care; Z=High impedance 4/18 ST75C176 Maximum ratings 3 Table 4. Symbol VCC VI VDI VDO VRI VRO Maximum ratings Absolute maximum ratings Parameter Supply voltage Control input voltage (RE, DE) Driver input voltage (DI) Driver output voltage (A, B) Receiver input voltage (A, B) Receiver output voltage (RO) Value 7 -0.5 to (VCC + 0.5) -0.5 to (VCC + 0.5) 14 14 -0.5 to (VCC + 0.5) Unit V V V V V V Note: Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. 5/18 Electrical characteristics ST75C176 4 Table 5. Electrical characteristics DC electrical characteristics (VCC = 5V 5%, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25C) (See Note 1) Parameter Differential driver output (no load) Differential driver output (with load) RL = 27 (RS-485), (See Figure 2.) RL = 50 (RS-422), (See Figure 2.) 1.5 Test Conditions Min. Typ. Max. 5 5 5 Unit V V V Symbol VOD1 VOD2 VOD Change in magnitude of driver differential output RL = 27 or 50 (See Figure 2.) voltage for complementary output states Driver common-mode output voltage Change in magnitude of driver common-mode output voltage for complementary output states Input high voltage Input low voltage Input current Input current (A, B) Receiver differential threshold voltage Receiver input hysteresis Receiver output high voltage Receiver output low voltage 3-State (high impedance) output current at receiver Receiver input resistance No load supply current (Note 2) RL = 27 or 50 (See Figure 2.) 0.2 V VOC 3 V VOC RL = 27 or 50 (See Figure 2.) 0.2 V VIH VIL IIN1 IIN2 RE, DE, DI RE, DE, DI RE, DE, DI VCM = 0V or 5.25V, VDE = 0V VIN = 12V VIN = -7V VCM = -7 to 12V VCM = 0V IO = -4mA, VID = 200mV IO = 4mA, VID = -200mV VO = 0.4 to 2.4V VCM = -7 to 12V VRE = 0V or VCC VDE = VCC VDE = 0V 2.0 0.8 2 1 -0.8 -0.2 70 3.5 0.4 1 12 400 300 35 900 500 250 0.2 V V A mA mA V mV V V A KW A A mA VTH VTH VOH VOL IOZR RIN ICC IOSD1 Driver short-circuit current, VO = -7 to 12V (Note 3) VO=High 6/18 ST75C176 Table 5. Electrical characteristics DC electrical characteristics (VCC = 5V 5%, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25C) (See Note 1) Parameter Test Conditions Min. 35 7 Typ. Max. 250 95 Unit mA mA Symbol IOSD2 IOSR Driver short-circuit current, VO = -7 to 12V (Note 3) VO=Low Receiver short-circuit current VO = 0V to VCC 1 2 3 Table 6. All currents into device pins are positive; all cuts out of device pins are negative; all voltages are referenced to device ground unless specified. Supply current specification is valid for loaded transmitters when VDE = 0V Applies to peak current. See typical operating characteristics. Driver switching characteristics (VCC = 5V 5%, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25C) (See Note 1) Parameter Test Conditions Min. 10 Typ. 30 5 3 15 40 40 40 40 Max. 60 10 40 70 70 70 70 Unit ns ns ns ns ns ns ns Symbol tPLH tPHL tSK tTLH tTHL tPZH tPZL tPLZ tPHZ Propagation delay input to RDIFF = 54, CL1 = CL2 = 100pF output (See Figure 4 and Figure 6) Output skew to output Rise or fall time Output enable time Output enable time Output disable time Output disable time RDIFF = 54, CL1 = CL2 = 100pF (See Figure 4 and Figure 6) RDIFF = 54, CL1 = CL2 = 100pF (See Figure 4 and Figure 6) CL = 100pF, S2 = Closed (See Figure 5 and Figure 7) CL = 100pF, S1 = Closed (See Figure 5 and Figure 7) CL = 15pF, S1 = Closed (See Figure 5 and Figure 7) CL = 15pF, S2 = Closed (See Figure 5 and Figure 7) Note: 1 All currents into device pins are positive; all cuts out of device pins are negative; all voltages are referenced to device ground unless specified. 7/18 Electrical characteristics ST75C176 Table 7. Receiver switching characteristics (VCC = 5V 5%, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25C) (See Note 1) Parameter Test Conditions Min. 20 Typ. 130 13 20 20 20 20 2.5 50 50 50 50 Max. 210 Unit ns ns ns ns ns ns Mbps Symbol tPLH tPHL tSKD tPZH tPZL tPLZ tPHZ fMAX Propagation delay input to RDIFF = 54, CL1 = CL2 = 100pF output (See Figure 4 and Figure 8) Differential receiver skew Output enable time Output enable time Output disable time Output disable time Maximum data rate RDIFF = 54, CL1 = CL2 = 100pF (See Figure 4 and Figure 8) CRL = 15pF, S1 = Closed (See Figure 3 and Figure 9) CRL = 15pF, S2 = Closed (See Figure 3 and Figure 9) CRL = 15pF, S1 = Closed (See Figure 3 and Figure 9) CRL = 15pF, S2 = Closed (See Figure 3 and Figure 9) Note: All currents into device pins are positive; all cuts out of device pins are negative; all voltages are referenced to device ground unless specified. 8/18 ST75C176 Test circuits and typical characteristics 5 Figure 2. Test circuits and typical characteristics Driver DC test load Figure 3. Receiver timing test load Figure 4. Drive/receiver timing test circuit Figure 5. Driver timing test load 9/18 Test circuits and typical characteristics Figure 6. Driver propagation delay ST75C176 Figure 7. Driver enable and disable time 10/18 ST75C176 Figure 8. Receiver propagation delay Test circuits and typical characteristics Figure 9. Receiver enable and disable time Figure 10. Receiver output current vs output low voltage Figure 11. Receiver output current vs output high voltage 11/18 Test circuits and typical characteristics ST75C176 Figure 12. Driver output current vs output low Figure 13. Driver output current vs output voltage high voltage Figure 14. Supply current vs temperature Figure 15. Receiver high level output voltage vs. temperature Figure 16. Receiver low level output voltage vs. temperature Figure 17. Differential driver output voltage vs temperature 12/18 ST75C176 Package mechanical data 6 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 13/18 Package mechanical data ST75C176 Plastic DIP-8 MECHANICAL DATA mm. DIM. MIN. A a1 B B1 b b1 D E e e3 e4 F I L Z 0.44 3.3 1.6 0.017 8.8 2.54 7.62 7.62 7.1 4.8 0.130 0.063 0.38 0.7 1.39 0.91 0.5 0.5 9.8 0.346 0.100 0.300 0.300 0.280 0.189 0.015 1.65 1.04 TYP 3.3 0.028 0.055 0.036 0.020 0.020 0.386 0.065 0.041 MAX. MIN. TYP. 0.130 MAX. inch P001F 14/18 ST75C176 Package mechanical data SO-8 MECHANICAL DATA DIM. A A1 A2 B C D E e H h L k ddd 0.1 5.80 0.25 0.40 mm. MIN. 1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 6.20 0.50 1.27 0.228 0.010 0.016 TYP MAX. 1.75 0.25 1.65 0.51 0.25 5.00 4.00 MIN. 0.053 0.04 0.043 0.013 0.007 0.189 0.150 0.050 0.244 0.020 0.050 inch TYP. MAX. 0.069 0.010 0.065 0.020 0.010 0.197 0.157 8 (max.) 0.04 0016023/C 15/18 Package mechanical data ST75C176 Tape & Reel SO-8 MECHANICAL DATA mm. DIM. MIN. A C D N T Ao Bo Ko Po P 8.1 5.5 2.1 3.9 7.9 12.8 20.2 60 22.4 8.5 5.9 2.3 4.1 8.1 0.319 0.216 0.082 0.153 0.311 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.335 0.232 0.090 0.161 0.319 MIN. TYP. MAX. 12.992 0.519 inch 16/18 ST75C176 Revision history 7 Table 8. Date Revision history Revision history Revision 3 Changes Order codes has been updated and new template. 04-May-2006 17/18 ST75C176 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST's terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. 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