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ns 3V 1.5V 1.5V INPUT PULSE GENERATOR (See Note A) tPHL 0V OUTPUT RL tPLH OUTPUT CL VOH 50% 50% VOL tTHL 5 2 $ tTLH /&- :& 4 ) 10ns 90% VCC 10% PULSE GENERATOR (See Note A) INPUT RL OUTPUT 90% 50% 10ns 3V 50% 10% tPHL 0V tPLH ZZ OUTPUT CL VOH 10% 1.5V (See Note C) 1.5V 90% VOL tTHL 5 2 $ tTLH /&- :& 4 ) " 5= ' 5. 2 - & .&2 . 40 - .& & B' $ # 2 8 &# A - && & $' # # 2 & " C & ' 2 2' : = 23 4?@,A3 = ' UART +5V GD75232 /DCD ZZ /DSR ZZ SIN ZZ +12V +12V DCD DSR /DSR DB95 RX 1 6 2 SOUT TX 7 3 /CTS CTS ZZ 8 SIN 1 2 6 ZZ /RTS ZZ SOUT 7 3 4 4 9 5 5 8 /CTS 9 DTR /DTR /RI +5V /DCD RTS /RTS GD75323 ZZ /DTR RI ZZ -12V /RI -12V