ST1480AB ST1480AC 3.3 V powered, 15 kV ESD protected, up to 12 Mbps true RS-485/RS-422 transceiver Datasheet - production data Description The ST1480Ax is ±15kV ESD protected, 3.3V low power transceiver for RS-485 and RS-422 communications. The device contains one driver and one receiver in half duplex configuration. The ST1480Ax transmits and receives at a guaranteed data rate of at least 12Mbps. DIP-8 SO-8 All transmitter outputs and receiver inputs are protected to ±15 kV using Human Body Model. Driver is short-circuit current limited and is protected against excessive power dissipation by Features thermal shutdown circuitry that places the driver • ESD protection outputs into a high-impedance state. – ±15 kV human body model The ST1480Ax input has a true fail-safe feature – ±8 kV IEC 1000-4-2 contact discharge that guarantees a logic high output if both inputs are open circuit, shorted together or in the • Operates from a single 3.3 V supply - no presence of a termination with no signal on the charge pump required bus. • Interoperable with 5V logic • 1µA low current shutdown mode max • Guaranteed 12Mbps data rate • -7 to 12 common mode input voltage range • Half duplex versions available • Industry standard 75176 pinout • Current limiting and thermal shutdown for driver overload protection • Guaranteed high receiver output state for floating, shorted or terminated inputs with no signal present • Allows up to 64 transceivers on the bus Table 1. Device summary Order codes Temperature range Package Packaging ST1480ACN 0 to 70 °C DIP-8 50 parts per tube / 40 tube per box ST1480ACDR 0 to 70 °C SO-8 (tape & reel) 2500 parts per reel ST1480ABDR -40 to 85 °C SO-8 (tape & reel) 2500 parts per reel July 2013 DocID9101 Rev 4 1/21 This is information on a product in full production. www.st.com

Contents ST1480AB - ST1480AC Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Test circuits and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2/21 DocID9101 Rev 4

ST1480AB - ST1480AC Pin configuration 1 Pin configuration Figure 1. Pin connections Figure 2. Pin description Pin n° Symbol Name and function 1 RO Receiver output. If A>B by 200mV, RO is high; if A<B by 200mV, RO is low Receiver Output Enable. RO is enabled when RE is low; RO is high impedance when RE 2 RE is high. If RE is high and DE is low, the device enters a low power shutdown mode. Driver Output Enable. The driver outputs are enabled by bringing DE high. They are high impedance when DE is low. If RE is high DE is low, the device enters a low-power 3 DE shutdown mode. If the driver outputs are enabled, the part functions as line driver, while they are high impedance, it functions as line receivers if RE is low. Driver input. A low on DI forces output A low and output B high. Similarly, a high on DI 4 DI forces output A high and output B low 5 GND Ground 6 A Non-inverting receiver input and non-inverting driver output 7 B Inverting receiver input and inverting driver output 8 V Supply voltage: V = 3V to 3.6V CC CC DocID9101 Rev 4 3/21 21

Truth tables ST1480AB - ST1480AC 2 Truth tables Table 2. Truth table (driver) Inputs Outputs Mode RE DE DI B A X H H L H Normal X H L H L Normal L L X Z Z Normal H L X Z Z Shutdown Note: X= Don’t care; Z=High impedance Table 3. Truth table (receiver) Inputs Output Mode RE DE A-B RO L L ≥ -0.015V H Normal L L ≤ -0.2V L Normal L L Inputs open H Normal L L Inputs shorted H Normal H L X Z Shutdown Note: X= Don’t care; Z=High impedance 4/21 DocID9101 Rev 4

ST1480AB - ST1480AC Maximum ratings 3 Maximum ratings Table 4. Absolute maximum ratings Symbol Parameter Value Unit V Supply voltage 7 V CC V Control input voltage (RE, DE) -0.3 to 7 V I V Driver input voltage (DI) -0.3 to 7 V DI V Driver output voltage (A, B) ± 14 V DO V Receiver input voltage (A, B) ± 14 V RI V Receiver output voltage (RO) -0.3 to (V + 0.3) V RO CC Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 5. ESD performance: transmitter outputs, receiver inputs Symbol Parameter Test conditions Min. Typ. Max. Unit ESD ESD protection voltage Human body model ± 15 kV ESD ESD protection voltage IEC-1000-4-2 contact discharge ± 8 kV DocID9101 Rev 4 5/21 21

Electrical characteristics ST1480AB - ST1480AC 4 Electrical characteristics V = 3 V to 3.6 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred CC to TA = 25 °C). Table 6. Electrical characteristics Symbol Parameter Test conditions Min. Typ. Max. Unit DE=V , CC RE=0V or 1.3 2.2 mA ISUPPLY VCC Power supply current NVo Load, DI=0V or VCC CC DE=0V, 1.2 1.9 mA RE=0V I Shutdown supply current DE=0V, RE=V , DI=0V or V 0.002 1 µA SHDN CC CC Table 7. Logic input electrical characteristics Symbol Parameter Test conditions Min. Typ. Max. Unit V Input logic threshold low DE, DI, RE 1.3 0.8 V IL V Input logic threshold high DE, DI, RE 2 V IH I Logic input current DE, DI, RE ± 2.0 µA IN1 V =12V 1 mA IN I Input current (A, B) DE=0V, V = 0 or 3.6V IN2 CC V =-7V -0.8 mA IN Table 8. Transmitter electrical characteristics Symbol Parameter Test conditions Min. Typ. Max. Unit R = 100Ω (RS-422) (Figure1) 2 V L V Differential drive output R = 54Ω (RS-485) (Figure1) 1.5 V OD L R = 60Ω (RS-485) (Figure3) 1.5 V L Change in magnitude of driver differential output voltage for ΔV R = 54Ω or 100Ω (Figure1) 0.2 V OD complementary output states L (Note: 1) Driver common mode output V R = 54Ω or 100Ω (Figure1) 3 V OC voltage L Change in magnitude of driver ΔV common mode output voltage R = 54Ω or 100Ω (Figure1) 0.2 V OC L (Note: 1) Driver short circuit output I ± 250 mA OSD current 6/21 DocID9101 Rev 4

ST1480AB - ST1480AC Electrical characteristics Table 9. Receiver electrical characteristics Symbol Parameter Test Conditions Min. Typ. Max. Unit Receiver differential V V = -7V to 12V, DE = 0 -0.2 -0.015 V TH threshold voltage CM ΔV Receiver input hysteresis V = 0V 30 µV TH CM Receiver output high V I = -4mA, V = 200mV, (Figure9) 2 V OH voltage OUT ID Receiver output low V I = 4mA, V = -200mV, (Figure4) 0.4 V OL voltage OUT ID 3-state (high impedance) I V = 3.6V, V = 0V to V ± 1 µA OZR output current at receiver CC O CC R Receiver input resistance V = -7V to 12V 24 kΩ RIN CM Receiver short-circuit I V = 0V to V 7 60 mA OSR current RO CC Table 10. Driver switching characteristics Symbol Parameter Test Conditions Min. Typ. Max. Unit D Maximum data rate 12 15 Mbps R R = 60Ω, C = 15pF, (Figure5 and t Differential output delay L L 18 30 ns DD Figure6) Differential output R = 60Ω, C = 15pF, (Figure5 and t L L 12 20 ns TD transition time Figure6) t R = 27Ω, C = 15pF, (Figure9 and PLH Propagation delay L L 18 30 ns t Figure10) PHL |t t | propagation R = 27Ω, C = 15pF, (Figure9 and t PLH - PHL L L 2 5 ns PDS delay skew (Note2) Figure10) t Output enable time R = 110Ω, (Figure11 and Figure12) 19 35 ns PZL L t Output enable time R = 110Ω, (Figure7 and Figure8) 30 50 ns PZH L t Output disable time R = 110Ω, (Figure7 and Figure8) 19 35 ns PHZ L t Output disable time R = 110Ω, (Figure11 and Figure12) 30 50 ns PLZ L Differential output delay t 1 3 ns SKEW skew Driver enable from t 30 50 ns ZH(SHDN) shutdown to output high Driver enable from t 19 35 ns ZL(SHDN) shutdown to output low DocID9101 Rev 4 7/21 21

Electrical characteristics ST1480AB - ST1480AC Table 11. Receiver switching characteristics Symbol Parameter Test Conditions Min. Typ. Max. Unit t V = 0V to 3V, C =15pF PLH Propagation delay ID L1 30 50 ns t (Figure13 and Figure14) PHL |t t | propagation V = 0V to 3V, C = 15pF t PLH - PHL ID L1 1 3 ns RPDS delay skew (Figure13 and Figure14) t Output enable time C = 15pF, (Figure15 and Figure19) 10 20 ns PZL RL t Output enable time C = 15pF, (Figure15 and Figure19) 10 20 ns PZH RL t Output disable time C = 15pF, (Figure15 and Figure19) 10 20 ns PHZ RL t Output disable time C = 15pF, (Figure15 and Figure19) 10 20 ns PLZ RL Receiver enable from t C = 15pF, (Figure15 and Figure19) 10 20 ns ZH(SHDN) shutdown to output high RL Receiver enable from t C = 15pF, (Figure15 and Figure19) 20 40 µs ZL(SHDN) shutdown to output low RL Note: 1 ΔV and ΔV are the changes in V and V , respectively, when the DI input changes OD OC OD OC state. 2 Measured on |t (A)-t (A)| and |t (B)-t (B)| PLH PHL PLH PHL 3 The transceivers are put into shutdown by bring RE high and DE low. If the input are in state for less than 80ns, the part are guaranteed not to enter shutdown. If the inputs are in this state for at least 300ns, the parts are guaranteed to have entered shutdown. 8/21 DocID9101 Rev 4

ST1480AB - ST1480AC Test circuits and typical characteristics 5 Test circuits and typical characteristics Figure 3. Driver and V test load OC Figure 4. Driver V with varying common mode voltage test load OD Figure 5. Receiver V and V test circuit OH OL DocID9101 Rev 4 9/21 21

Test circuits and typical characteristics ST1480AB - ST1480AC Figure 6. Drive differential output delay transition time test circuit Figure 7. Drive differential output delay transition time waveform Figure 8. Drive enable and disable times test circuit 10/21 DocID9101 Rev 4

ST1480AB - ST1480AC Test circuits and typical characteristics Figure 9. Drive enable and disable times waveforms Figure 10. Drive propagation time test circuit Figure 11. Drive propagation time waveform DocID9101 Rev 4 11/21 21

Test circuits and typical characteristics ST1480AB - ST1480AC Figure 12. Drive enable and disable times test circuit Figure 13. Drive enable and disable times waveforms Figure 14. Receiver propagation delay time test circuit 12/21 DocID9101 Rev 4

ST1480AB - ST1480AC Test circuits and typical characteristics Figure 15. Receiver propagation delay time waveforms Figure 16. Receiver enable and disable times test circuit Figure 17. Receiver enable and disable times waveform DocID9101 Rev 4 13/21 21

Test circuits and typical characteristics ST1480AB - ST1480AC Figure 18. Receiver enable and disable times waveform Figure 19. Receiver enable and disable times waveform Figure 20. Receiver enable and disable times waveform 14/21 DocID9101 Rev 4

ST1480AB - ST1480AC Test circuits and typical characteristics Figure 21. Receiver output current vs output Figure 22. Receiver output current vs output low voltage high voltage Figure 23. Low level driver output capability Figure 24. High level driver output capability Figure 25. Receiver input characteristics Figure 26. Driver short circuit current DocID9101 Rev 4 15/21 21

Test circuits and typical characteristics ST1480AB - ST1480AC Figure 27. Driver short circuit current 16/21 DocID9101 Rev 4

ST1480AB - ST1480AC Package mechanical data 6 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. Plastic DIP-8 mechanical data mm. inch. Dim. Min. Typ. Max. Min. Typ. Max. A 3.3 0.130 a1 0.7 0.028 B 1.39 1.65 0.055 0.065 B1 0.91 1.04 0.036 0.041 b 0.5 0.020 b1 0.38 0.5 0.015 0.020 D 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 3.3 0.130 Z 0.44 1.6 0.017 0.063 P001F DocID9101 Rev 4 17/21 21

Package mechanical data ST1480AB - ST1480AC SO-8 mechanical data mm. inch. Dim. Min. Typ. 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 8° (max.) ddd 0.1 0.04 0016023/C 18/21 DocID9101 Rev 4

ST1480AB - ST1480AC Package mechanical data Tape & reel SO-8 mechanical data mm. inch. Dim. Min. Typ. Max. Min. Typ. Max. A 330 12.992 C 12.8 13.2 0.504 0.519 D 20.2 0.795 N 60 2.362 T 22.4 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 DocID9101 Rev 4 19/21 21

Revision history ST1480AB - ST1480AC 7 Revision history Table 12. Document revision history Date Revision Changes 02-May-2006 2 Order codes updated. 19-Nov-2007 3 Added Table2. Updated: ECOPACK® section in Chapter6 . 24-Jul-2013 4 Corrected: unit of measurement in Table9 (Receiver input hysteresis from V to µV).Minor text changes. 20/21 DocID9101 Rev 4

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