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| ST485 LOW POWER RS-485/RS-422 TRANSCEIVER s s s s s s s s s LOW QUIESCENT CURRENT: 300A 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 64 TRANSCEIVERS ON THE BUS DIP SOP DESCRIPTION The ST485 is al low power transceiver for RS-485 and RS-422 communication. Each part contains one driver and one receiver. This transceiver draw 300A (typ.) of supply current when unloaded or fully loaded with disabled drivers. ORDERING CODES Type ST485CN ST485BN ST485AN ST485CD ST485BN ST485AD ST485CDR ST485BDR ST485ADR Temperature Range 0 to 70 C -40 to 85 C -55 to 125 C 0 to 70 C -40 to 85 C -55 to 125 C 0 to 70 C -40 to 85 C -55 to 125 C Package 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 ST485 is designed for bi-directional data communications on multipoint bus transmission line (half-duplex applciations). Comments 50parts per tube / 40tube per box 50parts per tube / 40tube per box 50parts per tube / 40tube per box 100parts per tube / 20tube per box 50parts per tube / 40tube per box 100parts per tube / 20tube per box 2500 parts per reel 2500 parts per reel 2500 parts per reel DIP-8 DIP-8 DIP-8 SO-8 (Tube) DIP-8 SO-8 (Tube) SO-8 (Tape & Reel) SO-8 (Tape & Reel) SO-8 (Tape & Reel) March 2002 1/12 ST485 PIN CONFIGURATION PIN DESCRIPTION PlN N 1 2 3 4 5 6 7 8 SYMBOL RO RE DE DI GND A B V CC NAME AND FUNCTION 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 TRUTH TABLE (DRIVER) INPUTS RE X X X DE H H L DI H L X OUTPUTS B L H Z A H L Z TRUTH TABLE (RECEIVER) INPUTS RE L L L H DE L L L L A-B +0.2V -0.2V INPUTS OPEN X OUTPUT RO H L H Z X= Don't Care; Z=High Impedance X= Don't Care; Z=High Impedance ABSOLUTE MAXIMUM RATINGS Symbol V CC VI VDI V DO VRI V RO 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) Parameter Value 12 -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 Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. 2/12 ST485 DC ELECTRICAL CHARACTERISTICS (VCC = 5V 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred to TA = 25C) (See Note 1) Symbol V OD1 V OD2 V OD Parameter Differential Driver Output (No Load) Differential Driver Output (With Load) Change in Magnitude of Driver Differential Output 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) Test Conditions Min. Typ. Max. 5 R L = 27 (RS-485) (See Fig. 1) R L = 50 (RS-422) (See Fig. 1) R L = 27 or 50 (See Fig. 1) 1.4 5 5 0.2 Unit V V V V VOC V OC R L = 27 or 50 (See Fig. 1) R L = 27 or 50 (See Fig. 1) 3 0.2 V V VIH VIL IIN1 IIN2 RE, DE, DI RE, DE, DI RE, DE, DI V CM = 0V or 5.25V V IN = 12V V IN = -7V V CM = -7 to 12V V CM = 0V IO = -4mA IO = 4mA VID = 200mV VID = -200mV VDE = 0V 2.0 0.8 2 1 -0.8 -0.2 70 3.4 0.5 1 24 400 300 35 35 7 900 500 250 250 95 0.2 V V A mA mA V mV V V A K A A mA mA mA VTH VTH VOH VOL IOZR R IN ICC 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) V O = 0.4 to 2.4V V CM = -7 to 12V V RE = 0V or VCC V DE = VCC V DE = 0V IOSD1 IOSD2 IOSR Driver Short-Circuit Current, V O = -7 to 12V (Note 3) VO=High Driver Short-Circuit Current, V O = -7 to 12V (Note 3) VO=Low Receiver Short-Circuit Current V O = 0V to V CC Note 1: All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device ground unless specified. Note 2: Supply current specification is valid for loaded transmitters when VDE = 0V Note 3: Applies to peak current. See typical Operating Characteristics. 3/12 ST485 DRIVER SWITCHING CHARACTERISTICS (VCC = 5V 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred to TA = 25C) (See Note 1) Symbol tPLH tPHL tSK tTLH tTHL tPZH tPZL tPLZ tPHZ Parameter Propagation Delay Input to Output Output Skew to Output Rise or Fall Time Output Enable Time Output Enable Time Output Disable Time Output Disable Time R DIFF = 54 Test Conditions CL1 = CL2 = 100pF Min. 10 Typ. 30 5 3 15 70 70 70 70 Max. 70 10 45 90 90 90 90 Unit ns ns ns ns ns ns ns (See Fig. 3 and 5) R DIFF = 54 CL1 = CL2 = 100pF (See Fig. 3 and 5) R DIFF = 54 CL1 = CL2 = 100pF (See Fig. 3 and C L = 100pF (See Fig. 4 and C L = 100pF (See Fig. 4 and CL = 15pF (See Fig. 4 and CL = 15pF (See Fig. 4 and 5) S2 = Closed 6) S1 = Closed 6) S1 = Closed 6) S2 = Closed 6) Note 1: All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device ground unless specified. RECEIVER SWITCHING CHARACTERISTICS (VCC = 5V 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred to TA = 25C) (See Note 1) Symbol tPLH tPHL tSKD tPZH tPZL tPLZ tPHZ fMAX Parameter Propagation Delay Input to Output Differential Receiver Skew Output Enable Time Output Enable Time Output Disable Time Output Disable Time Maximum Data Rate Test Conditions R DIFF = 54 CL1 = CL2 = 100pF (See Fig. 3 and 7) RDIFF = 54 (See Fig. 3 and C RL = 15pF (See Fig. 2 and C RL = 15pF (See Fig. 2 and CRL = 15pF (See Fig. 2 and CRL = 15pF (See Fig. 2 and CL1 = CL2 = 100pF 7) S1 = Closed 8) S2 = Closed 8) S1 = Closed 8) S2 = Closed 8) 2.5 Mbps 20 55 ns 20 55 ns 20 55 ns 20 55 ns Min. 20 Typ. 130 13 Max. 230 Unit ns ns Note 1: All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device ground unless specified. 4/12 ST485 TEST CIRCUITS AND TYPICAL CHARACTERISTICS Figure 1 : Driver DC Test Load Figure 3 : Drive/Receiver Timing Test Circuit Figure 2 : Receiver Timing Test Load Figure 4 : Driver Timing Test Load 5/12 ST485 Figure 5 : Driver Propagation Delay Figure 6 : Driver Enable and Disable Time 6/12 ST485 Figure 7 : Receiver Propagation Delay Figure 8 : Receiver Enable and Disable Time 7/12 ST485 Figure 9 : Receiver Output Current vs Output Low Voltage Figure 12 : Driver Output Current vs Output High Voltage Figure 10 : Receiver Output Current vs Output High Voltage Figure 13 : Supply Current vs Temperature Figure 11 : Driver Output Current vs Output Low Voltage Figure 14 : Receiver High Level Output Voltage vs Temperature 8/12 ST485 Figure 15 : Receiver Low Level Output Voltage vs Temperature Figure 16 : Differential Driver Output Voltage vs Temperature 9/12 ST485 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 10/12 ST485 SO-8 MECHANICAL DATA DIM. A a1 a2 a3 b b1 C c1 D E e e3 F L M S 3.8 0.4 4.8 5.8 1.27 3.81 4.0 1.27 0.6 8 (max.) 0.149 0.015 5.0 6.2 0.65 0.35 0.19 0.25 0.1 mm. MIN. TYP MAX. 1.75 0.25 1.65 0.85 0.48 0.25 0.5 45 (typ.) 0.189 0.228 0.050 0.150 0.157 0.050 0.023 0.196 0.244 0.025 0.013 0.007 0.010 0.003 MIN. inch TYP. MAX. 0.068 0.009 0.064 0.033 0.018 0.010 0.019 0016023 11/12 ST485 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. (c) The ST logo is a registered trademark of STMicroelectronics (c) 2002 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. (c) http://www.st.com 12/12 |
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