ST485E ±15KV ESD protected, low power RS-485/RS-422 transceiver General features ■ Low quiescent current: 300µA ■ Designed for RS-485 interface application ■ -7V to 12V common mode input voltage range ■ Driver maintains high impedance in 3-state or with the power OFF ■ 70mV typical input hysteresis ■ 30ns propagation delay, 5ns skew ■ Operates from a single 5V supply ■ Current limiting and thermal shutdown for driver overload protection driver and one receiver in half duplex configuration. ■ ESD protection: – ±15KV (H.B.M.) – ±8KV (IEC-1000-4-2 contact discharge) This transceiver draws 300µA (typ.) of supply current when unloaded or fully loaded with disabled drivers. ■ Allows up to 64 transceivers on the bus It operates from a single 5V supply. DIP-8 Description The ST485E is a low power transceiver for RS485 and RS-422 communication. Each driver output and receiver input is protected against ±15KV electrostatic discharge (H.B.M.) (ESD) shocks, without latch-up. These parts contain one SO-8 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 ST485E is designed for bi-directional data communications on multipoint bus transmission lines (half-duplex applications). Order codes Part numbers Temperature range Package Packaging ST485ECN 0 to 70 °C DIP-8 50parts per tube / 40tube per box ST485EBN -40 to 85 °C DIP-8 50parts per tube / 40tube per box ST485EXN -55 to 125 °C DIP-8 50parts per tube / 40tube per box ST485EBD -40 to 85 °C SO-8 (Tube) 100parts per tube / 20tube per box ST485ECDR 0 to 70 °C SO-8 (Tape & reel) 2500 parts per reel ST485EBDR -40 to 85 °C SO-8 (Tape & reel) 2500 parts per reel ST485EXDR -55 to 125 °C SO-8 (Tape & reel) 2500 parts per reel January 2007 Rev 11 1/19 www.st.com 19 Contents ST485E Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Test circuit and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2/19 ST485E Pin configuration 1 Pin configuration Figure 1. Pin connections (top view) Table 1. Pin description Pin n° Symbol Name and function 1 RO Receiver output 2 RE Receiver output enable 3 DE Driver output enable 4 DI Driver input 5 GND 6 A Non-inverting receiver input and non-inverting driver output 7 B Inverting receiver input and inverting driver output 8 VCC Ground Supply voltage 3/19 Truth tables ST485E 2 Truth tables Table 2. Truth table (driver) Inputs Outputs RE DE DI B A X H H L H X H L H L X L X Z Z Note: X = Don’t care; Z = High impedance Table 3. Truth table (receiver) Inputs Note: 4/19 Outputs RE DE A-B L L L L ≤-0.2V L L L Inputs open H H L X Z ≥ X = Don’t care; Z = High impedance +0.2V RO H ST485E Maximum ratings 3 Maximum ratings Table 4. Absolute maximum ratings Symbol VCC Parameter Supply voltage Value Unit 7 V VI Control input voltage (RE, DE) -0.5 to (VCC + 0.5) V VDI Driver input voltage (DI) -0.5 to (VCC + 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 (VCC + 0.5) V Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these is not implied. V+ and V- can have a maximum magnitude of +7V, but their absolute addition exceed 13 V. 5/19 Electrical characteristics ST485E 4 Electrical characteristics Table 5. ESD Performance: transmitter outputs, receiver inputs Symbol Parameter Test conditions Min. Typ. Max. Unit ESD ESD Protection voltage Human body model ±15 KV ESD ESD Protection voltage IEC-1000-4-2 ±8 KV Table 6. DC Electrical characteristics (VCC = 5V ± 5%, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25°C) Test conditions (1) Symbol Parameter VOD1 Differential driver output (No Load) VOD2 Differential driver output (With Load) RL = 27Ω (RS-485) (Figure 2.) RL = 50Ω (RS-422) (Figure 2.) ∆VOD Change in magnitude of driver differential output voltage for complementary output states RL = 27Ω or 50Ω (Figure 2.) VOC Driver common-mode output RL = 27Ω or 50Ω (Figure 2.) voltage ∆VOC Change in magnitude of driver common-mode output voltage for complementary output states RL = 27Ω or 50Ω (Figure 2.) VIH Input high voltage RE, DE, DI VIL Input low voltage RE, DE, DI 0.8 V IIN1 Input current RE, DE, DI ±2 µA IIN2 Input current (A, B) VCM = 0V or 5.25V, VDE = 0V VIN = 12V VIN = -7V 1 -0.8 mA mA VTH Receiver differential threshold voltage VCM = -7 to 12V 0.2 V ∆VTH Receiver input hysteresis VCM = 0V VOH Receiver output high voltage IO = -4mA, VID = 200mV VOL Receiver output low voltage IO = 4mA, VID = -200mV 0.4 V IOZR 3-State (high impedance) output current at receiver VO = 0.4 to 2.4V ±1 µA RIN Receiver input resistance VCM = -7 to 12V ICC No load supply current (2) VRE = 0V or VCC VDE = VCC VDE = 0V IOSD1 Driver short-circuit current, VO=High VO = -7 to 12V (3) 6/19 Min. Typ. 1.5 Max. Unit 5 V 5 5 V V 0.2 V 3 V 0.2 V 2.0 V -0.2 70 mV 3.5 V 24 KΩ 400 300 35 900 500 µA µA 250 mA ST485E Table 6. Symbol Electrical characteristics DC Electrical characteristics (VCC = 5V ± 5%, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25°C) Parameter Test conditions (1) IOSD2 Driver short-circuit current, VO=Low IOSR Receiver short-circuit current VO = 0V to VCC VO = -7 to 12V (3) Min. Typ. Max. Unit 35 250 mA 7 95 mA 1. All currents into device pins are positive; all out of device pins are negative; all voltages are referenced to device ground unless specified. 2. Supply current specification is valid for loaded transmitters when VDE = 0V 3. Applies to peak current. See typical Operating Characteristics. Table 7. Symbol Driver switching characteristics (VCC = 5V ± 5%, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25°C) Parameter Test conditions (1) Min. Typ. Max. Unit tPLH tPHL Propagation delay input to RDIFF = 54ΩCL1 = CL2 = 100pF output (See Figure 4. and Figure 6.) 25 45 ns tSK Output skew to output RDIFF = 54ΩCL1 = CL2 = 100pF (See Figure 4. and Figure 6.) 2 5 ns tTLH tTHL Rise or fall time RDIFF = 54Ω, CL1 = CL2 = 100pF (See Figure 4. and Figure 6.) 15 40 ns tPZH Output enable time CL = 100pF, S2 = Closed (See Figure 5. and Figure 7.) 35 50 ns tPZL Output enable time CL = 100pF, S1 = Closed (See Figure 5. and Figure 7.) 25 40 ns tPLZ Output disable time CL = 15pF, S1 = Closed (See Figure 5. and Figure 7.) 25 40 ns tPHZ Output disable time CL = 15pF, S2 = Closed (See Figure 5. and Figure 7.) 35 50 ns 1. All currents into device pins are positive; all out of device pins are negative; all voltages are referenced to device ground unless specified. 7/19 Electrical characteristics Table 8. Symbol ST485E Receiver switching characteristics (VCC = 5V ± 5%, TA = TMIN to TMAX, unless otherwise specified. Typical values are referred to TA = 25°C) Parameter Test conditions (1) Min. Typ. Max. Unit tPLH tPHL Propagation delay input to output RDIFF = 54Ω, CL1 = CL2 = 100pF (See Figure 4. and Figure 8.) 110 130 ns tSKD Differential receiver skew RDIFF = 54Ω, CL1 = CL2 = 100pF (See Figure 4. and Figure 8.) 5 10 ns tPZH Output enable time CRL = 15pF, S1 = Closed (See Fig. 2 and Figure 9.) 11 35 ns tPZL Output enable time CRL = 15pF, S2 = Closed (See Fig. 2 and Figure 9.) 13 35 ns tPLZ Output disable time CRL = 15pF, S1 = Closed (See Fig. 2 and Figure 9.) 13 35 ns tPHZ Output disable time CRL = 15pF, S2 = Closed (See Fig. 2 and Figure 9.) 11 35 ns fMAX Maximum data rate 5 Mbps 1. All currents into device pins are positive; all out of device pins are negative; all voltages are referenced to device ground unless specified 8/19 ST485E Test circuit and typical characteristics 5 Test circuit and typical characteristics Figure 2. Driver DC test load Figure 3. Receiver timing test load Figure 4. Drive/receiver timing test circuit Figure 5. Driver timing test load 9/19 Test circuit and typical characteristics Figure 6. Driver propagation delay Figure 7. Driver enable and disable time 10/19 ST485E ST485E Test circuit and typical characteristics Figure 8. Receiver propagation delay Figure 9. Receiver enable and disable time 11/19 Test circuit and typical characteristics Figure 10. Receiver output current vs. output low voltage ST485E Figure 11. Receiver output current vs. output high voltage Figure 12. Driver output current vs. output low Figure 13. Driver output current vs. output voltage high voltage Figure 14. Supply current vs. temperature 12/19 Figure 15. Receiver high level output voltage vs. temperature ST485E Figure 16. Receiver low level output voltage vs. temperature Test circuit and typical characteristics Figure 17. Differential driver output voltage vs. temperature 13/19 Package mechanical data 6 ST485E 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 14/19 ST485E 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 15/19 Package mechanical data ST485E 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 16/19 ST485E 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 17/19 Revision history ST485E 7 Revision history Table 9. Revision history Date Revision 21-Mar-2006 9 Order codes has been updated and new template. 05-Jun-2006 10 Change value row 10 in general features and RIN in Table 6. 29-Jan-2007 11 Typo mistake on page 1. 18/19 Changes ST485E 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. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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