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part number : 75189 Description : RS232 to TTL level shifter.A inputs are RS232-level inputs, C inputs are response control, a TTLsignal which could be used to adjust threshhold and hysteresis but isgenerally unnecessary and unused. It is often tied through a 300 - 470 pF capacitor to ground.
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1A| 1 14| VCC
1C| 2 13| 4A
1Y| 3 12| 4C
2A| 4 11| 4Y
2C| 5 10| 3A
2Y| 6 9| 3C
GND| 7 8| 3Y
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