ST490

ST490A STMICROELECTRONICS | Alldatasheet

Document overview

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Technical content

■ LOW SUPPLY CURRENT: 5mA MAX ■ -7 TO 12 COMMON MODE INPUT VOLTAGE RANGE ■ 70mV TYPICAL INPUT HYSTERESIS ■ DESIGNED FOR 25Mbps OPERATION ■ OPERATE FROM SINGLE 5 SUPPLY ■ ±4kV ESD PROTECTION ■ CURRENT LIMITING AND THERMAL SHUTDOWN FOR DRIVER OVERLOAD PROTECTION

DESCRIPTION

The ST490A is a low power transceiver for RS-485 and RS-422 communications. The device contains one driver and one receiver in full duplex configuration. The ST490A draws 5mA (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 receiver input has a fail-safe feature that guarantees a logic high output if both inputs are open circuit. ORDERING CODES Type Temperature Range Package Comments ST490ACN 0 to 70 °C DIP-8 50parts per tube / 40tube per box ST490ABN -40 to 85 °C DIP-8 50parts per tube / 40tube per box ST490ACD 0 to 70 °C SO-8 (Tube) 100parts per tube / 20tube per box ST490ABD -40 to 85 °C SO-8 (Tube) 100parts per tube / 20tube per box ST490ACDR 0 to 70 °C SO-8 (Tape & Reel) 2500 parts per reel ST490ABDR -40 to 85 °C SO-8 (Tape & Reel) 2500 parts per reel ST490A LOW POWER HIGH SPEED RS-485/RS-422 TRANSCEIVER DIP SOP

TRUTH TABLE (DRIVER) X= Don’t Care; Z=High Impedance TRUTH TABLE (RECEIVER) ?= Irrelevant; 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 VCC Supply Voltage

2 RO Receiver Output. 3 DI Driver Input.

4 GND Ground

5 Z Inverting Driver Output

6 Y Non-inverting Driver Output

7 B Inverting Receiver Input

8 A Non-inverting Receiver Input

≥ -0.2V H between -0.2V to 0.2V ? ≤ -0.2V L OPEN H Symbol Parameter Value Unit VCC Supply Voltage 7V VDI Driver Input Voltage -0.5 to 7 V VY,VZ Driver Output Voltage -7.5 to 12.5 V VA,VB Receiver Input Voltage -7.5 to 12.5 V VRO Receiver Output Voltage -0.3 to (V CC + 0.3) V ESD Human Boby Model 3.5 KV

ELECTRICAL CHARACTERISTICS

VCC =4 . 5 Vt o5 . 5 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA =2 5 ° C ) TRANSMITTER ELECTRICAL CHARACTERISTICS VCC = 4.5V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are referred to Ta = 25°C) Symbol Parameter Test Conditions Min. Typ. Max. Unit ISUPPLY No Load Supply Current 2 5 mA C IN Input Capacitance 1.8 pF C YZ Driver Output Capacitance 1.2 pF C OUT Output Capacitance 2.3 pF Symbol Parameter Test Conditions Min. Typ. Max. Unit VOD1 Differential Drive Output (No load) VCC V VOD2 Differential Drive Output (With Load) R L=5 4Ω (RS-422) (Figure 1) 1.5 2.6 5 V VOD3 Differential Drive Output (With Load) R L= 100Ω (RS-422) (Figure 1) 2 3 V ΔVOD Change in magnitude of Driver Differential Output Voltage for Complementary Output States (Note1) R L=5 4Ω or 100Ω (Figure 1) 0 0.2 V VOC Driver Common Mode Output Voltage R L=5 4Ω (Figure 1) 1 3 V ΔVOC Change in magnitude of Driver Common Mode Output Voltage (Note1) R L=5 4Ω (Figure 1) 0 0.2 V IOFF Power Off Output Current VCC =0 V V O =-7V to 12V ± 100 µA IOSD Driver Short Circuit Output Current VO =-7V to 12V ± 35 ± 250 mA VIL Input Logic Threshold Low 0.8 V VIH Input Logic Threshold High 2 V

RECEIVER ELECTRICAL CHARACTERISTICS VCC = 4.5V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are referred to Ta = 25°C) DRIVER SWITCHING CHARACTERISTICS VCC =4 . 5 Vt o5 . 5 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to Ta = 25°C) RECEIVER SWITCHING CHARACTERISTICS VCC =4 . 5 Vt o5 . 5 V ,TA = -40 to 85°C, unless otherwise specified. Typical values are referred to Ta = 25°C) Symbol Parameter Test Conditions Min. Typ. Max. Unit IIN1 Logic Input Current ± 2.0 µA IIN2 Input Current (A, B) other input=0V VCC = 0 or 5.25V VIN=12V 0.5 1 mA VIN=-7V -0.35 -0.8 mA V TH Receiver Differential Threshold Voltage VCM = -7V to 12V -0.2 0.2 V ΔV TH Receiver Input Hysteresis VCM =0 V 7 0 m V VOH Receiver Output High Voltage IOUT = -8mA, VID = 200mV 3.5 4.7 V V OL Receiver Output Low Voltage IOUT = 8mA, VID = -200mV 0.2 0.4 V R RIN Receiver Input Resistance VCM = -7V to 12V 12 24 K Ω IOSR Receiver Short-Circuit Current VO =0 Vt oVCC 79 5 m A Symbol Parameter Test Conditions Min. Typ. Max. Unit D R Maximum Data Rate Jitter <5% 25 50 Mbps tPLH tPHL Propagation Delay Input to Output R L=5 4Ω C L1=C L2=50pF, (Figure 1) 10 16 ns tSKEW Differential Output Delay Skew R L=5 4Ω C L1=C L2=50pF, (Figure 1) 1 3 ns tTLH tTHL Rise or Fall Differential Time R L=5 4Ω C L1=C L2=50pF, (Figure 1) 8 12 ns Symbol Parameter Test Conditions Min. Typ. Max. Unit tPLH tPHL Propagation Delay Input to Output C L = 15pF (Figures 2,4) 19 30 ns tSKD |tPLH -tPHL | Receiver Output Skew C L = 15pF (Figures 2,4) 1 3 ns tTLH tTHL Rise or Fall Time C L = 15pF (Figures 2,4) 8 ns

Figure 11 :Receiver Input Current vs Input Voltage

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 1.75 0.068 a1 0.1 0.25 0.003 0.009 a2 1.65 0.064 a3 0.65 0.85 0.025 0.033 b 0.35 0.48 0.013 0.018 b1 0.19 0.25 0.007 0.010 C 0.25 0.5 0.010 0.019 c1 45˚ (typ.) D 4.8 5.0 0.189 0.196 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 3.81 0.150 F 3.8 4.0 0.149 0.157 L 0.4 1.27 0.015 0.050 M 0.6 0.023 S ˚ (max.) SO-8 MECHANICAL DATA 0016023

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