ST485XN

ST485B ST485C Low power RS-485/RS-422 transceiver Features ■ Low quiescent current: 300 µA ■ Designed for RS-485 interface application ■ - 7 V to 12 V common mode input voltage range ■ Driver maintains high impedance in 3-state or with the power OFF ■ 70 mV typical input hysteresis ■ 30 ns propagation delay, 5 ns skew ■ Operate from a single 5 V supply ■ Current limiting and thermal shutdown for driver overload protection ■ Allows up to 64 transceivers on the bus DIP-8 SO-8 The ST485 is available in three temperature range: commercial (0 °C to 70 °C), industrial (- 40 °C to 85 °C) and automotive (- 55 °C to 125 °C). 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 300 µA (typ.) of supply current when unloaded or fully loaded with disabled drivers. It operates from a single 5 V 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 applications). Table 1. Device summary Order code Temperature range Package Packaging ST485CN 0 to 70 °C DIP-8 50 parts per tube / 40 tube per box ST485BN - 40 to 85 °C DIP-8 50 parts per tube / 40 tube per box ST485CDR 0 to 70 °C SO-8 (tape and reel) 2500 parts per reel ST485BDR - 40 to 85 °C SO-8 (tape and reel) 2500 parts per reel February 2009 Rev 16 1/19 www.st.com 19 Contents ST485B - ST485C Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.1 Driver switching characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.2 Receiver switching characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 Test circuit and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2/19 ST485B - ST485C Pin configuration 1 Pin configuration Figure 1. Pin connections Table 2. Pin description Pin n° Symbol Name and function 1 RO Receiver output 2 RE Receiver output enable 3 DE Driver output enable 4 DI Driver input 5 GND 6 A Non-inverting receiver input and non-inverting driver output 7 B Inverting receiver input and inverting driver output 8 VCC Ground Supply voltage 3/19 Truth tables ST485B - ST485C 2 Truth tables Table 3. Truth table (driver) Inputs Outputs RE DE DI B A X H H L H X H L H L X L X Z Z Note: X = Don’t care; Z = High impedance Table 4. Truth table (receiver) Inputs Note: 4/19 Outputs RE DE A-B L L ≥ +0.2V H L L ≤ -0.2V L L L Inputs open H H L X Z X = Don’t care; Z = High impedance RO ST485B - ST485C Maximum ratings 3 Maximum ratings Table 5. Absolute maximum ratings Symbol VCC Parameter Supply voltage Value Unit 7 V VI Control input voltage (RE, DE) -0.5 to (VCC + 0.5) V VDI Driver input voltage (DI) -0.5 to (VCC + 0.5) V VDO Driver output voltage (A, B) ± 14 V VRI Receiver input voltage (A, B) ± 14 V VRO Receiver output voltage (RO) -0.5 to (VCC + 0.5) V Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. 5/19 Electrical characteristics 4 ST485B - ST485C Electrical characteristics VCC = 5 V ± 5 %, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25 °C Table 6. DC electrical characteristics Value Symbol Parameter Test conditions (1) -40 to 85 °C Min. VOD1 Differential driver output (no load) VOD2 Differential driver output (with load) ΔVOD Change in magnitude of driver differential output RL = 27Ω or 50Ω Figure 2 voltage for complementary output states VOC Driver common-mode output voltage ΔVOC Typ. -55 to 125 °C Max. Min. Max. 5 V 5 5 V V 0.2 0.2 V RL = 27Ω or 50Ω Figure 2 3 3 V Change in magnitude of driver common-mode output voltage for complementary output states RL = 27Ω or 50Ω Figure 2 0.2 0.2 V VIH Input high voltage RE, DE, DI VIL Input low voltage RE, DE, DI 0.8 0.8 V IIN1 Input current RE, DE, DI ±2 ±2 µA IIN2 Input current (A, B) VCM = 0V or 5.25V, VDE = 0V VIN = 12V VIN = -7V 1 -0.8 1 -0.8 mA mA VTH Receiver differential threshold voltage VCM = -7 to 12V 0.2 V ΔVTH Receiver input hysteresis VCM = 0V VOH Receiver output high voltage IO = -4mA, VID = 200mV VOL Receiver output low voltage IO = 4mA, VID = -200mV 0.4 0.55 V IOZR 3-state (high impedance) output current at receiver VO = 0.4 to 2.4V ±1 ±1 µA RIN Receiver input resistance VCM = -7 to 12V ICC No load supply current (2) VRE = 0V or VCC VDE = VCC VDE = 0V 6/19 5 Unit RL = 27Ω (RS-485) Figure 2 RL = 50Ω (RS-422) Figure 2 5 5 1.5 2.0 1.4 2.0 -0.2 0.2 -0.2 V 70 mV 3.5 3.4 24 V 24 400 300 900 500 kΩ 900 500 µA µA ST485B - ST485C Table 6. Electrical characteristics DC electrical characteristics (continued) Value Symbol Parameter Test conditions (1) -40 to 85 °C Min. Typ. -55 to 125 °C Max. Min. Max. Unit IOSD1 Driver short-circuit current, VO=High VO = -7 to 12V (3) 35 250 35 250 mA IOSD2 Driver short-circuit current, VO=Low VO = -7 to 12V (3) 35 250 35 250 mA IOSR Receiver short-circuit current VO = 0V to VCC 7 95 7 95 mA 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. 2. Supply current specification is valid for loaded transmitters when VDE = 0V 3. Applies to peak current. See typical Operating Characteristics. VCC = 5 V ± 5 %, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25 °C Table 7. Driver switching characteristics Value Symbol Parameter Test conditions (1) -40 to 85 °C -55 to 125°C Min. Unit Min. Typ. Max. Max. 10 30 60 70 ns 5 10 10 ns 15 40 45 ns tPLH tPHL Propagation delay input to output RDIFF = 54Ω, CL1 = CL2 = 100pF (See Figure 4 and Figure 6) tSK Output skew to output RDIFF = 54Ω, CL1 = CL2 = 100pF (See Figure 4 and Figure 6) tTLH tTHL Rise or fall time RDIFF = 54Ω, CL1 = CL2 = 100pF (See Figure 4 and Figure 6) tPZH Output enable time CL = 100pF, S2 = Closed (See Figure 5 and Figure 7) 70 90 90 ns tPZL Output enable time CL = 100pF, S1 = Closed (See Figure 5 and Figure 7) 70 90 90 ns tPLZ Output disable time CL = 15pF, S1 = Closed (See Figure 5 and Figure 7) 70 90 90 ns tPHZ Output disable time CL = 15pF, S2 = Closed (See Figure 5 and Figure 7) 70 90 90 ns 3 3 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. 7/19 Electrical characteristics ST485B - ST485C VCC = 5 V ± 5%, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25 °C Table 8. Receiver switching characteristics Value Symbol Parameter Test conditions (1) -40 to 85 °C Min. Typ. Max. 20 130 210 -55 to 125°C Min. Unit Max. tPLH tPHL Propagation delay input to output RDIFF=54Ω, CL1 = CL2 = 100pF (See Figure 4 and Figure 8) tSKD Differential receiver skew RDIFF=54Ω, CL1 = CL2 = 100pF (See Figure 4 and Figure 8) 13 tPZH Output enable time CRL = 15pF, S1 = Closed (See Fig. 2 and Figure 9) 20 50 56 ns tPZL Output enable time CRL = 15pF, S2 = Closed (See Fig. 2 and Figure 9) 20 50 56 ns tPLZ Output disable time CRL = 15pF, S1 = Closed (See Fig. 2 and Figure 9) 20 50 56 ns tPHZ Output disable time CRL = 15pF, S2 = Closed (See Fig. 2 and Figure 9) 20 50 56 ns fMAX Maximum data rate 2.5 230 ns ns 2.5 Mbps 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 8/19 ST485B - ST485C Test circuit and typical characteristics 5 Test circuit and typical characteristics Figure 2. Driver DC test load Figure 3. Receiver timing test load Figure 4. Drive/receiver timing test circuit Figure 5. Driver timing test load 9/19 Test circuit and typical characteristics 10/19 Figure 6. Driver propagation delay Figure 7. Driver enable and disable time ST485B - ST485C ST485B - ST485C Test circuit and typical characteristics Figure 8. Receiver propagation delay Figure 9. Receiver enable and disable time 11/19 Test circuit and typical characteristics Figure 10. Receiver output current vs. output low voltage ST485B - ST485C Figure 11. Receiver output current vs. output high voltage Figure 12. Driver output current vs. output low Figure 13. Driver output current vs. output voltage high voltage Figure 14. Supply current vs. temperature 12/19 Figure 15. Receiver high level output voltage vs. temperature ST485B - ST485C Figure 16. Receiver low level output voltage vs. temperature Test circuit and typical characteristics Figure 17. Differential driver output voltage vs. temperature 13/19 Package mechanical data 6 ST485B - ST485C 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. 14/19 ST485B - ST485C Package mechanical data Plastic DIP-8 mechanical data mm. inch. Dim. Min. A Typ. Max. Min. 3.3 Typ. Max. 0.130 a1 0.7 B 1.39 1.65 0.055 0.065 B1 0.91 1.04 0.036 0.041 b b1 0.028 0.5 0.38 0.020 0.5 D 0.015 0.020 9.8 0.386 E 8.8 0.346 e 2.54 0.100 e3 7.62 0.300 e4 7.62 0.300 F 7.1 0.280 I 4.8 0.189 L Z 3.3 0.44 0.130 1.6 0.017 0.063 P001F 15/19 Package mechanical data ST485B - ST485C SO-8 mechanical data Dim. mm. Min. Typ. inch. Max. Min. Typ. Max. A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.04 0.010 A2 1.10 1.65 0.043 0.065 B 0.33 0.51 0.013 0.020 C 0.19 0.25 0.007 0.010 D 4.80 5.00 0.189 0.197 E 3.80 4.00 0.150 0.157 e 1.27 0.050 H 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k ddd 8° (max.) 0.1 0.04 0016023/C 16/19 ST485B - ST485C Package mechanical data Tape & reel SO-8 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 22.4 0.519 0.882 Ao 8.1 8.5 0.319 0.335 Bo 5.5 5.9 0.216 0.232 Ko 2.1 2.3 0.082 0.090 Po 3.9 4.1 0.153 0.161 P 7.9 8.1 0.311 0.319 17/19 Revision history ST485B - ST485C 7 Revision history Table 9. Document revision history Date Revision 21-Mar-2006 12 Order codes has been updated and new template. 02-Aug-2006 13 Mistake in cover page first row mA ==> µA. 08-Nov-2006 14 Added: Table 1. 07-Feb-2008 15 Modified: Table 1 on page 1. 16-Feb-2009 16 Modified Note: on page 5. 18/19 Changes ST485B - ST485C 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. 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