ST485 ST Microelectronics, ST485 Datasheet
ST485
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ST485 Summary of contents
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... Current limiting and thermal shutdown for driver overload protection I Allows transceivers on the bus Description The ST485 is al low power transceiver for RS-485 and RS-422 communication. Each part contains one driver and one receiver. This transceiver draw 300mA (typ.) of supply current when unloaded or fully loaded with disabled drivers ...
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... Contents Contents 1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.1 Driver switching characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.2 Receiver switching characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 Test circuit and typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 9 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2/19 ST485 ...
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... ST485 1 Pin configuration Figure 1. Pin configuration 1.1 Pin description Table 1. Pin description Pin n° Symbol Name and function RO Receiver Output RE Receiver Output Enable DE Driver Output Enable DI Driver Input GND Ground Non-inverting Receiver Input and Non-inverting A Driver Output B Inverting Receiver Input and Inverting Driver Output ...
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... Note Don’t care High impedance Table 3. Truth table (receiver) Inputs Note Don’t care High impedance 4/ A-B L ≥ +0.2V ≤ L -0.2V L INPUTS OPEN L X ST485 Outputs Outputs ...
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... ST485 3 Maximum ratings Table 4. Absolute maximum ratings Symbol V Supply Voltage CC V Control Input Voltage (RE, DE Driver Input Voltage (DI Driver Output Voltage ( Receiver Input Voltage ( Receiver Output Voltage (RO) RO Note: Absolute maximum ratings are those values beyond which damage to the device may occur. ...
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... 4mAV = -200mV 0 12V CM Value - °C -55 to 125 °C Min Typ Max Min Max 1.5 1 0.2 0 0.2 0.2 2.0 2.0 0.8 0.8 ± 2 ± -0.8 -0.8 -0.2 0.2 -0.2 0.2 70 3.5 3.4 0.4 0.55 ± 1 ± ST485 Unit µ µA KW ...
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... ST485 Table 5. DC Electrical characteristics Symbol Parameter No Load Supply Current I CC (2) Driver Short-Circuit I OSD1 Current, V =High O Driver Short-Circuit I OSD2 Current, V =Low O Receiver Short-Circuit I OSR Current 1. All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device ground unless specified ...
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... Figure 9 15pFS1 = Closed RL (See Fig. 2 and Figure 9 15pFS2 = Closed RL (See Fig. 2 and Figure 9.) Value - °C -55 to 125°C Min. Typ. Max. Min. Max. 20 130 210 230 2.5 2.5 ST485 Unit Mbps ...
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... ST485 5 Test circuit and typical characteristics Figure 2. Driver DC test load Figure 4. Drive/receiver timing test circuit Test circuit and typical characteristics Figure 3. Receiver timing test load Figure 5. Driver timing test load 9/19 ...
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... Test circuit and typical characteristics Figure 6. Driver propagation delay Figure 7. Driver enable and disable time 10/19 ST485 ...
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... ST485 Figure 8. Receiver propagation delay Figure 9. Receiver Enable and Disable Time Test circuit and typical characteristics 11/19 ...
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... Test circuit and typical characteristics Figure 10. Receiver output current vs. output low voltage Figure 12. Driver output current vs. output low voltage Figure 14. Supply current vs. temperature 12/19 Figure 11. Receiver output current vs. output high voltage Figure 13. Driver output current vs. output high voltage Figure 15. Receiver high level output voltage vs. temperature ST485 ...
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... ST485 Figure 16. Receiver low level output voltage vs. temperature Test circuit and typical characteristics Figure 17. Differential driver output voltage vs. temperature 13/19 ...
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... 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 trademark. ECOPACK specifications are available at: 14/19 www.st.com ST485 ...
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... ST485 DIM. MIN 0.7 B 1. 0.44 Plastic DIP-8 MECHANICAL DATA mm. TYP MAX. 3.3 1.65 1.04 0.5 0.5 9.8 8.8 2.54 7.62 7.62 7.1 4.8 3.3 1.6 Package mechanical data inch MIN. TYP. MAX. 0.130 0.028 0.055 0.065 0.036 0.041 0.020 0.015 0.020 0.386 0.346 0.100 0.300 0.300 0.280 0.189 0.130 0.017 ...
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... DIM. MIN. A 1.35 A1 0.10 A2 1.10 B 0.33 C 0.19 D 4. 5.80 h 0.25 L 0.40 k ddd 16/19 SO-8 MECHANICAL DATA mm. TYP MAX. 1.75 0.25 1.65 0.51 0.25 5.00 4.00 1.27 6.20 0.50 1.27 ˚ (max.) 8 0.1 inch MIN. TYP. MAX. 0.053 0.069 0.04 0.010 0.043 0.065 0.013 0.020 0.007 0.010 0.189 0.197 0.150 0.157 0.050 0.228 0.244 0.010 0.020 0.016 0.050 0016023/C ST485 0.04 ...
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... ST485 DIM. MIN 12 8.1 Bo 5.5 Ko 2.1 Po 3.9 P 7.9 Tape & Reel SO-8 MECHANICAL DATA mm. TYP MAX. 330 13.2 22.4 8.5 5.9 2.3 4.1 8.1 Package mechanical data inch MIN. TYP. MAX. 12.992 0.504 0.519 0.795 2.362 0.882 0.319 0.335 0.216 0.232 0.082 0.090 0.153 0.161 0.311 0.319 17/19 ...
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... Revision history 7 Revision history Table 8. Revision history Date Revision 21-Mar-2006 12 18/19 Order codes has been updated and new template. Changes ST485 ...
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... ST485 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. ...