ST490A LOW POWER HIGH SPEED RS-485/RS-422 TRANSCEIVER ■ ■ ■ ■ ■ ■ ■ 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. DIP SOP 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 ST490ABN ST490ACD ST490ABD ST490ACDR ST490ABDR 0 to 70 °C -40 to 85 °C 0 to 70 °C -40 to 85 °C 0 to 70 °C -40 to 85 °C DIP-8 DIP-8 SO-8 (Tube) SO-8 (Tube) SO-8 (Tape & Reel) SO-8 (Tape & Reel) 50parts per tube / 40tube per box 50parts per tube / 40tube per box 100parts per tube / 20tube per box 100parts per tube / 20tube per box 2500 parts per reel 2500 parts per reel November 2002 1/11 ST490A PIN CONFIGURATION PIN DESCRIPTION PlN N° SYMBOL NAME AND FUNCTION 1 VCC Supply Voltage 2 3 4 5 6 7 8 RO DI GND Z Y B A Receiver Output. Driver Input. Ground Inverting Driver Output Non-inverting Driver Output Inverting Receiver Input Non-inverting Receiver Input TRUTH TABLE (RECEIVER) TRUTH TABLE (DRIVER) INPUT OUTPUTS DIFFERENTIAL INPUT OUTPUT DI Y Z A-B RO L H L H H L ≥ -0.2V between -0.2V to 0.2V ≤ -0.2V OPEN H ? L H X= Don’t Care; Z=High Impedance ?= Irrelevant; Z=High Impedance ABSOLUTE MAXIMUM RATINGS Symbol Parameter VCC Supply Voltage VDI Driver Input Voltage VY, VZ Driver Output Voltage VA, VB Receiver Input Voltage VRO Receiver Output Voltage ESD Human Boby Model Value Unit 7 V -0.5 to 7 V -7.5 to 12.5 V -7.5 to 12.5 V -0.3 to (VCC + 0.3) V 3.5 KV Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. 2/11 ST490A 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. ISUPPLY No Load Supply Current Typ. Max. Unit 2 5 mA CIN Input Capacitance 1.8 pF CYZ Driver Output Capacitance 1.2 pF Output Capacitance 2.3 pF COUT 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 VOD1 Differential Drive Output (No load) Differential Drive Output (With Load) Differential Drive Output (With Load) Change in magnitude of Driver Differential Output Voltage for Complementary Output States (Note1) Driver Common Mode Output Voltage Change in magnitude of Driver Common Mode Output Voltage (Note1) Power Off Output Current VOD2 VOD3 ∆VOD VOC ∆VOC IOFF VIL Driver Short Circuit Output Current Input Logic Threshold Low VIH Input Logic Threshold High IOSD Test Conditions Min. Typ. RL= 54Ω (RS-422) (Figure 1) 1.5 2.6 RL= 100Ω (RS-422) (Figure 1) 2 3 RL= 54Ω or 100Ω (Figure 1) RL= 54Ω (Figure 1) 0 1 RL= 54Ω (Figure 1) VCC = 0V 0 VO=-7V to 12V VO=-7V to 12V ± 35 Max. Unit VCC V 5 V V 0.2 V 3 V 0.2 V ± 100 µA ± 250 mA 0.8 2 V V 3/11 ST490A 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) Symbol Parameter Test Conditions Min. IIN1 Logic Input Current IIN2 Input Current (A, B) other input=0V VCC= 0 or 5.25V VTH Receiver Differential Threshold Voltage Receiver Input Hysteresis VCM = -7V to 12V Receiver Output High Voltage Receiver Output Low Voltage Receiver Input Resistance IOUT = -8mA, VID = 200mV VCM = -7V to 12V 12 Receiver Short-Circuit Current VO = 0V to VCC 7 ∆VTH VOH VOL RRIN IOSR VIN=12V VIN=-7V Typ. 3.5 IOUT = 8mA, VID = -200mV Unit ± 2.0 µA 0.5 1 mA -0.35 -0.8 mA 0.2 V -0.2 VCM = 0V Max. 70 mV 4.7 V 0.2 0.4 V 95 mA 24 KΩ DRIVER SWITCHING 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. 25 50 Max. Unit DR Maximum Data Rate Jitter <5% tPLH tPHL Propagation Delay Input to Output RL= 54Ω CL1=CL2=50pF, (Figure 1) 10 16 ns Differential Output Delay Skew Rise or Fall Differential Time RL= 54Ω CL1=CL2=50pF, (Figure 1) 1 3 ns RL= 54Ω CL1=CL2=50pF, (Figure 1) 8 12 ns tSKEW tTLH tTHL Mbps RECEIVER SWITCHING 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 tPLH tPHL Propagation Delay Input to Output CL = 15pF (Figures 2,4) 19 30 ns tSKD |tPLH - tPHL| Receiver Output CL = 15pF Skew Rise or Fall Time CL = 15pF (Figures 2,4) 1 3 ns (Figures 2,4) 8 tTLH tTHL 4/11 ns ST490A TEST CIRCUITS AND TYPICAL CHARACTERISTICS Figure 1 : Driver DC Test Load Figure 2 : Driver/Receiver Timing Test Circuit 5/11 ST490A Figure 3 : Driver Propagation Delay Figure 4 : Receiver Propagation Delay 6/11 ST490A Figure 5 : Receiver Output Current vs Output Voltage (Output Low) Figure 8 : Driver Diff. Output Voltage vs Common Mode Voltage (Diff. Output High) Figure 6 : Receiver Output Current vs Output Voltage (Output High) Figure 9 : Driver Short Circuit Current vs Line Voltage (Output High) Figure 7 : Driver Diff. Output Voltage vs Common Mode Voltage (Diff. Output Low) Figure 10 : Driver Short Circuit Current vs. Line Voltage (Output Low) 7/11 ST490A Figure 11 : Receiver Input Current vs Input Voltage 8/11 ST490A 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 9/11 ST490A SO-8 MECHANICAL DATA DIM. mm. MIN. TYP A a1 inch MAX. MIN. TYP. 1.75 0.1 0.068 0.25 a2 MAX. 0.003 0.009 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 S 0.6 0.023 8˚ (max.) 0016023 10/11 ST490A Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. © The ST logo is a registered trademark of STMicroelectronics © 2002 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. © http://www.st.com 11/11