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UM3243EESS Datasheet(PDF) 13 Page - Union Semiconductor, Inc. |
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UM3243EESS Datasheet(HTML) 13 Page - Union Semiconductor, Inc. |
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13 / 22 page  http://www.union-ic.com Rev.01 Mar.2015 13/22 UM3243 Generator (see Note B) 50 Ω FORCEOFF CL=30pF (see Note A) ROUT TEST CIRCUIT FORCEON Auto Power-Off V+ NOTES: A. CL includes probe and jig capacitance. B. The pulse generator has the following characteristics: PRR=5kbit/s, ZO=50Ω, 50% duty cycle, tr≤10ns, tf≤10ns. INVALID Receiver Input 2.7V -2.7V 2.7V 3V 0V 0V -2.7V -3V 50% VCC 50% VCC VCC 0V INVALID Output V+ V- Supply Voltages ≈V+ ≈V- 0.3V 0.3V 0V VCC VOLTAGE WAVEFORMS tinvalid tvalid ten Indeterminate Indeterminate Valid RS-232 Level, INVALID High If Signal Remains Within This Region For More Than 30µs, INVALID Is Low* Valid RS-232 Level, INVALID High * Auto Power-Off disables transmitters and reduces supply current to 1µA. 2.7V 0.3V 0V -0.3V -2.7V Charge Pump V- Figure 6. INVALID __________________ Propagation Delay Times and Supply Enabling Time |
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