ST490A Low power high speed RS-485/RS-422 transceiver General features ■ ■ Low supply current: 5mA max -7V to 12V common mode input voltage range ■ 70mV tipycal input hysteresis ■ Designed for 25Mbps operation ■ Operate from a single 5V supply ■ ±4kV 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 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. Order code Part number Temperature range Package Packaging 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 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 May 2006 Rev 3 1/17 www.st.com 17 Contents ST490A 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 ST490A Pin configuration 1 Pin configuration Figure 1. Pin connections Table 1. 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 ST490A 2 Truth tables Table 2. Truth table (driver) Inputs DI Y Z L L H H H L Note: X = Don’t care; Z = High impedance Table 3. 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 ST490A Maximum ratings 3 Maximum ratings Table 4. 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 VRO Receiver output voltage -0.3 to (VCC + 0.3) V ESD Human body model 3.5 KV 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 ST490A 4 Electrical characteristics Table 5. 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 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 6. 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) 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 ∆VOD Change in magnitude of driver differential output voltage for complementary output states RL= 54Ω or 100Ω (Figure 1.) Driver common mode output voltage RL= 54Ω (Figure 1.) ∆VOC 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 VOC 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 ST490A Table 7. Symbol Electrical characteristics 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) Parameter Test Conditions Min. IIN1 Logic input current IIN2 Input current (A, B) VTH Receiver differential threshold voltage VCM = -7V to 12V ∆VTH 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 8. 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 = 4.5V to 5.5V, 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 9. Symbol 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) 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 ST490A ST490A Test circuit and typical characteristics Figure 4. Driver propagation delay Figure 5. Receiver propagation delay 9/17 Test circuit and typical characteristics ST490A 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 ST490A Test circuit and typical characteristics Figure 12. Receiver input current vs input voltage 11/17 Package mechanical data 6 ST490A 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 ST490A 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 ST490A 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 ST490A 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 ST490A 7 Revision history Table 10. 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 has been updated and new template. 16/17 Changes ST490A Please Read Carefully: Information in this document is provided solely in connection with ST products. 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