8339 STMICROELECTRONICS | Alldatasheet

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Technical content

■ LOW QUIESCENT CURRENT: 300 µA ■ DESIGNED FOR RS-485 INTERFACE

APPLICATIONS

■ -7V TO 12V COMMON MODE INPUT VOLTAGE RANGE ■ DRIVER MAINTAINS HIGH IMPEDANCE IN 3 - S T A T EO RW I T HT H EP O W E RO F F ■ 70mV TYPICAL INPUT HYSTERESIS ■ 30ns PROPAGATION DELAYS, 5ns SKEW ■ OPERATE FROM A SINGLE 5V SUPPLY ■ CURRENT LIMITING AND THERMAL SHUTDOWN FOR DRIVER OVERLOAD PROTECTION ■ ESD PROTECTION: ±15KV (H.B.M.) ±8KV (IEC-1000-4-2 CONTACT DISCHARGE) ■ ALLOWS UP TO 64 TRANSCEIVERS ON THE BUS

DESCRIPTION

The ST485E is al low power transceiver for RS-485 and RS-422 communication. Each driver output and receiver input is protected against ±15KV electrostatic discharge (H.B.M.) (ESD) shocks, without latcup. These parts contain one driver and one receiver in half duplex configuration. This transceiver draw 300µA (typ.) of supply current when unloaded or fully loaded with disabled drivers. 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 place the driver outputs into a high-impedance state. The ST485E is designed for bi-directional data communications on multipoint bus transmission line (half-duplex applications). ORDERING CODES Type Temperature Range Package Comments ST485ECN 0 to 70 °C DIP-8 50parts per tube / 40tube per box ST485EBN -40 to 85 °C DIP-8 50parts per tube / 40tube per box ST485EXN -55 to 125 °C DIP-8 50parts per tube / 40tube per box ST485ECD 0 to 70 °C SO-8 (Tube) 100parts per tube / 20tube per box ST485EBD -40 to 85 °C SO-8 (Tube) 100parts per tube / 20tube per box ST485EXD -55 to 125 °C SO-8 (Tube) 100parts per tube / 20tube per box ST485ECDR 0 to 70 °C SO-8 (Tape & Reel) 2500 parts per reel ST485EBDR -40 to 85 °C SO-8 (Tape & Reel) 2500 parts per reel ST485EXDR -55 to 125 °C SO-8 (Tape & Reel) 2500 parts per reel ST485E ±15KV ESD PROTECTED, LOW POWER RS-485/RS-422 TRANSCEIVER DIP SOP

TRUTH TABLE (DRIVER) X= Don’t Care; Z=High Impedance TRUTH TABLE (RECEIVER) X= Don’t Care; Z=High Impedance ABSOLUTE MAXIMUM RATINGS Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. PlN N° SYMBOL NAME AND FUNCTION

1 RO Receiver Output

2R E Receiver Output Enable

3 DE Driver Output Enable

4 DI Driver Input

5 GND Ground

6 A Non-inverting Receiver Input and Non-inverting Driver Output

7 B Inverting Receiver Input and Inverting Driver Output

LL ≥ +0.2V H LL ≤ -0.2V L L L INPUTS OPEN H HL X Z Symbol Parameter Value Unit VCC Supply Voltage 7V VI Control Input Voltage (RE, DE) -0.5 to (V CC + 0.5) V V DI Driver Input Voltage (DI) -0.5 to (V CC + 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 (V CC + 0.5) V

ESD PERFORMANCE: TRANSMITTER OUTPUTS, RECEIVER INPUTS DC ELECTRICAL CHARACTERISTICS (VCC =5 V± 5%, TA =T MIN to TMAX , unless otherwise specified. Typical values are referred to TA = 25°C) (See Note 1) 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 =0 V Note 3: Applies to peak current. See typical Operating Characteristics. 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 ±8K V Symbol Parameter Test Conditions Min. Typ. Max. Unit VOD1 Differential Driver Output (No Load) VOD2 Differential Driver Output (With Load) R L =2 7Ω (RS-485) (See Fig. 1) R L =5 0Ω (RS-422) (See Fig. 1) 1.5 5 V V ΔVOD Change in Magnitude of Driver Differential Output Voltage for Complementary Output States R L =2 7Ω or 50Ω (See Fig. 1) 0.2 V VOC Driver Common-Mode Output Voltage R L =2 7Ω or 50Ω (See Fig. 1) 3 V ΔVOC Change in Magnitude of Driver Common-Mode Output Voltage for Complementary Output States R L =2 7Ω or 50Ω (See Fig. 1) 0.2 V VIH Input High Voltage RE , DE, DI 2.0 V VIL Input Low Voltage RE , DE, DI 0.8 V IIN1 Input Current RE , DE, DI ± 2 µA IIN2 Input Current (A, B) V CM = 0V or 5.25V V DE =0 V VIN = 12V VIN = -7V -0.8 mA mA V TH Receiver Differential Threshold Voltage VCM = -7 to 12V -0.2 0.2 V ΔV TH Receiver Input Hysteresis VCM =0 V 7 0 m V VOH Receiver Output High Voltage IO = -4mA V ID = 200mV 3.5 V V OL Receiver Output Low Voltage IO =4 m A V ID = -200mV 0.4 V IOZR 3-State (High Impedance) Output Current at Receiver VO = 0.4 to 2.4V ± 1 µA R IN Receiver Input Resistance VCM = -7 to 12V 24 K Ω ICC No Load Supply Current (Note 2) VRE =0 Vo rVCC VDE =V CC VDE =0 V 400 300 900 500 µA µA IOSD1 Driver Short-Circuit Current, VO =High VO = -7 to 12V (Note 3) 35 250 mA IOSD2 Driver Short-Circuit Current, VO =Low VO = -7 to 12V (Note 3) 35 250 mA IOSR Receiver Short-Circuit Current VO =0 Vt oVCC 79 5 m A

DRIVER SWITCHING CHARACTERISTICS (VCC =5 V± 5%, TA =T MIN to TMAX , unless otherwise specified. Typical values are referred to TA =2 5 ° C ) (See Note 1) 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 =5 V± 5%, TA =T MIN to TMAX , unless otherwise specified. Typical values are referred to TA = 25°C) (See Note 1) 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. Symbol Parameter Test Conditions Min. Typ. Max. Unit tPLH tPHL Propagation Delay Input to Output R DIFF =5 4Ω C L1 =C L2 = 100pF (See Fig. 3 and 5) 25 45 ns tSK Output Skew to Output R DIFF =5 4Ω C L1 =C L2 = 100pF (See Fig. 3 and 5) 25 n s tTLH tTHL Rise or Fall Time R DIFF =5 4Ω C L1 =C L2 = 100pF (See Fig. 3 and 5) 15 40 ns tPZH Output Enable Time C L = 100pF S2 = Closed (See Fig. 4 and 6) 35 50 ns tPZL Output Enable Time C L = 100pF S1 = Closed (See Fig. 4 and 6) 25 40 ns tPLZ Output Disable Time C L = 15pF S1 = Closed (See Fig. 4 and 6) 25 40 ns tPHZ Output Disable Time C L = 15pF S2 = Closed (See Fig. 4 and 6) 35 50 ns Symbol Parameter Test Conditions Min. Typ. Max. Unit tPLH tPHL Propagation Delay Input to Output R DIFF =5 4Ω C L1 =C L2 = 100pF (See Fig. 3 and 7) 110 130 ns tSKD Differential Receiver Skew RDIFF =5 4Ω C L1 =C L2 = 100pF (See Fig. 3 and 7) 51 0 n s tPZH Output Enable Time C RL = 15pF S2 = Closed (See Fig. 2 and 8) 11 35 ns tPZL Output Enable Time C RL = 15pF S1 = Closed (See Fig. 2 and 8) 13 35 ns tPLZ Output Disable Time C RL = 15pF S1 = Closed (See Fig. 2 and 8) 13 35 ns tPHZ Output Disable Time C RL = 15pF S2 = Closed (See Fig. 2 and 8) 11 35 ns fMAX Maximum Data Rate 5 Mbps

DIM. mm. inch 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 Plastic DIP-8 MECHANICAL DATA P001F

DIM. mm. inch 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 ˚ (max.) ddd 0.1 0.04 SO-8 MECHANICAL DATA 0016023/C

DIM. mm. inch 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 Tape & Reel SO-8 MECHANICAL DATA

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