ST75C176 STMICROELECTRONICS | Alldatasheet

Document overview

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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 ■ ALLOWS UP TO 32 TRANSCEIVERS ON THE BUS ■ BIC MOS TECHNOLOGY

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 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 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 applciations). ORDERING CODES Type Temperature Range Package Comments ST75C176CN 0 to 70 °C DIP-8 50parts per tube / 40tube per box ST75C176BN -40 to 85 °C DIP-8 50parts per tube / 40tube per box ST75C176CD 0 to 70 °C SO-8 (Tube) 100parts per tube / 20tube per box ST75C176BD -40 to 85 °C SO-8 (Tube) 100parts per tube / 20tube per box ST75C176CDR 0 to 70 °C SO-8 (Tape & Reel) 2500 parts per reel ST75C176BDR -40 to 85 °C SO-8 (Tape & Reel) 2500 parts per reel ST75C176 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

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 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 VTH 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 12 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) 10 30 60 ns tSK Output Skew to Output R DIFF =5 4Ω C L1 =C L2 = 100pF (See Fig. 3 and 5) 51 0 n s tTLH tTHL Rise or Fall Time R DIFF =5 4Ω C L1 =C L2 = 100pF (See Fig. 3 and 5) 31 5 4 0 n s tPZH Output Enable Time C L = 100pF S2 = Closed (See Fig. 4 and 6) 40 70 ns tPZL Output Enable Time C L = 100pF S1 = Closed (See Fig. 4 and 6) 40 70 ns tPLZ Output Disable Time C L = 15pF S1 = Closed (See Fig. 4 and 6) 40 70 ns tPHZ Output Disable Time C L = 15pF S2 = Closed (See Fig. 4 and 6) 40 70 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) 20 130 210 ns tSKD Differential Receiver Skew RDIFF =5 4Ω C L1 =C L2 = 100pF (See Fig. 3 and 7) 13 ns tPZH Output Enable Time C RL = 15pF S1 = Closed (See Fig. 2 and 8) 20 50 ns tPZL Output Enable Time C RL = 15pF S2 = Closed (See Fig. 2 and 8) 20 50 ns tPLZ Output Disable Time C RL = 15pF S1 = Closed (See Fig. 2 and 8) 20 50 ns tPHZ Output Disable Time C RL = 15pF S2 = Closed (See Fig. 2 and 8) 20 50 ns fMAX Maximum Data Rate 2.5 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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