ST490AB Low power high speed RS-485/RS-422 transceiver Features ■ Low supply current: 5 mA max ■ -7 V to 12 V common mode input voltage range ■ 70 mV typical input hysteresis ■ Designed for 25 Mbps operation ■ Operate from a single 5 V supply ■ ±4 kV ESD protection ■ Current limiting and thermal shutdown for driver overload protection DIP-8 SO-8 Description The ST490A is a low power transceiver for RS485 and RS-422 communications. The device contains one driver and one receiver in full duplex configuration. The ST490A draws 5 mA (typ.) of supply current when unloaded or fully loaded with disabled drivers. It operates from a single 5 V 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. Table 1. Device summary Order code Temperature range Package Packaging ST490ABN -40 to 85 °C DIP-8 50 parts per tube / 40 tube per box ST490ABDR -40 to 85 °C SO-8 (tape and reel) 2500 parts per reel February 2008 Rev 5 1/17 www.st.com 17 Contents ST490AB Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Test circuit and typical characteristics 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/17 ......................... 8 ST490AB Pin configuration 1 Pin configuration Figure 1. Pin connections Table 2. Pin description Pin n° Symbol Name and function 1 VCC Supply voltage 2 RO Receiver output 3 DI Driver input 4 GND 5 Y Non-inverting driver output 6 Z Inverting driver output 7 B Inverting receiver input 8 A Non-inverting receiver input Ground 3/17 Truth tables ST490AB 2 Truth tables Table 3. Truth table (driver) Inputs DI Y Z L L H H H L Note: X = Don’t care; Z = High impedance Table 4. Truth table (receiver) Note: 4/17 Outputs Differential inputs Outputs A-B RO ≥ -0.2V H between -0.2V to 0.2V ? ≤-0.2V L OPEN H X = Don’t care; Z = High impedance ST490AB Maximum ratings 3 Maximum ratings Table 5. Absolute maximum ratings Symbol Parameter VCC Supply voltage VDI Driver input voltage Value Unit 7 V -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 -0.3 to (VCC + 0.3) V 3.5 kV VRO Receiver output voltage ESD Human body model Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. 5/17 Electrical characteristics ST490AB 4 Electrical characteristics Table 6. Electrical characteristics (VCC = 4.5 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C) Symbol ISUPPLY Parameter Min. 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 Table 7. Transmitter electrical characteristics (VCC = 4.5 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C) Symbol Parameter VOD1 Differential drive output (no load) VOD2 Differential drive output (with load) RL= 54Ω (RS-422) (Figure 1) 1.5 2.6 VOD3 Differential drive output (with load) RL= 100Ω (RS-422) (Figure 1) 2 3 ΔVOD Change in magnitude of driver differential output voltage for complementary output states RL= 54Ω or 100Ω (Figure 1) VOC Driver common mode output voltage RL= 54Ω (Figure 1) ΔVOC Change in magnitude of driver common mode output voltage RL= 54Ω (Figure 1) IOFF Power off output current VCC = 0V, VO=-7V to 12V IOSD Driver short circuit output current VO=-7V to 12V 6/17 VIL Input logic threshold low VIH Input logic threshold high Test conditions Min. Typ. 0 1 0 ± 35 2 Max. Unit VCC V 5 V V 0.2 V 3 V 0.2 V ± 100 µA ± 250 mA 0.8 V V ST490AB Table 8. Symbol Electrical characteristics Receiver electrical characteristics (VCC = 4.5 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C) Parameter Test conditions Min. IIN1 Logic input current IIN2 Input current (A, B) VTH Receiver differential threshold voltage VCM = -7V to 12V ΔVTH Receiver input hysteresis VCM = 0V VOH Receiver output high voltage IOUT = -8mA, VID = 200mV VOL Receiver output low voltage IOUT = 8mA, VID = -200mV RRIN Receiver input resistance VCM = -7V to 12V 12 IOSR Receiver short-circuit current VO = 0V to VCC 7 Table 9. Symbol Other input=0V VCC= 0 or 5.25V Typ. Max. Unit ± 2.0 μA VIN=12V 0.5 1 mA VIN=-7V -0.35 -0.8 mA 0.2 V -0.2 3.5 70 mV 4.7 V 0.2 0.4 24 V kΩ 95 mA Driver switching characteristics (VCC = 4.5 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C) 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 tSKEW Differential output delay skew RL= 54Ω, CL1=CL2=50pF, (Figure 1) 1 3 ns Rise or fall differential time RL= 54Ω, CL1=CL2=50pF, (Figure 1) 8 12 ns tTLH tTHL Table 10. Symbol Mbps Receiver switching characteristics (VCC = 4.5 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C) Parameter Test conditions Min. Typ. Max. Unit tPLH tPHL Propagation delay input to output CL = 15pF, (Figure 2, Figure 4) 19 30 ns tSKD |tPLH - tPHL| Receiver output skew CL = 15pF, (Figure 2, Figure 4) 1 3 ns tTLH tTHL Rise or fall time CL = 15pF, (Figure 2, Figure 4) 8 ns 7/17 Test circuit and typical characteristics 5 Test circuit and typical characteristics Figure 2. Driver DC test load Figure 3. Drive/receiver timing test circuit 8/17 ST490AB ST490AB Test circuit and typical characteristics Figure 4. Driver propagation delay Figure 5. Receiver propagation delay 9/17 Test circuit and typical characteristics ST490AB Figure 6. Receiver output current vs. output low voltage (output low) Figure 8. Driver diff. output voltage vs Figure 9. common mode voltage (diff. output low) Figure 10. driver short circuit current vs line voltage (output high) 10/17 Figure 7. Receiver output current vs. output high voltage (output high) Driver diff. output voltage vs common mode voltage (diff. output high) Figure 11. Receiver high level output voltage vs. temperature ST490AB Test circuit and typical characteristics Figure 12. Receiver input current vs input voltage 11/17 Package mechanical data 6 ST490AB Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com 12/17 ST490AB Package mechanical data 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 13/17 Package mechanical data ST490AB SO-8 mechanical data Dim. mm. Min. Typ. inch. 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 ddd 8° (max.) 0.1 0.04 0016023/C 14/17 ST490AB Package mechanical data Tape & reel SO-8 mechanical data mm. inch. Dim. Min. A Typ. Max. Min. 330 Max. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 Typ. 0.504 22.4 0.519 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 15/17 Revision history ST490AB 7 Revision history Table 11. Document revision history Date Revision 06-Jul-2005 2 Typing error on table 2 - pin 5 non-inverting, pin 6 inverting. 04-May-2006 3 Order codes updated. 08-Nov-2007 4 Added: Table 1. 07-Feb-2008 5 Modified: Table 1 on page 1. 16/17 Changes ST490AB Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. 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