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75323L-S20-R Datasheet(PDF) 10 Page - Unisonic Technologies |
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75323L-S20-R Datasheet(HTML) 10 Page - Unisonic Technologies |
10 / 12 page 75323 LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 10 of 12 www.unisonic.com.tw QW-R113-007,B APPLICATION INFORMATION Diodes placed in series with the VDD and VSS leads protect the UTC 75323 in the fault condition in which the device output are shorted to VDD or VSS, and the Power supplies are at low and provide low-impedance paths to ground (see Figure7) UTC 75323 UTC 75323 VDD Output ±15V VSS VDD VSS Fig. 7 Power-Supply Protection to Meet Power-Off Fault Condition of TIA/EIA-232-F 10 9 8 7 6 5 4 3 2 1 5V 11 12 13 14 15 16 17 18 19 20 43 37 40 13 36 11 41 42 RI DTR CTS TX RTS RX DSR DCD 12V RI DTR CTS RTS DSR DCD SO SI -12V C5* C4* C3* C2* C1* 1 6 9 5 GND 5DA 3RY 4DA 2RY 1RY 3DA 2DA 1DA Vcc VSS 5DY 3RA 4DY 2RA 1RA 3DY 2DY 1DY VDD UTC 75323 TL16C450 ACE TIA/EIA-232-F DB9S CONNECTOR Fig. 8 Typical Connection *See Figure Slew Rate vs. Load Capacitance to select the correct values for the loading capacitors (C1, C2, C3, C4 and C5), which may be required to meet the RS-232 maximum slew-rate requirement of 30V/us. The value of the loading capacitors resrequired depends upon the line length and desired slew rate, but is typically 330pF. Note C: To use the receivers only, VDD and Vss both must be powered or tied to ground. |
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