A trinary signal? Correction...
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The Output voltages I indicated in the truth table were
approximations. Closer values if 1K resistors and a 5K
resistors used are in the table below...
Truth Table:
I/O pin Old Values Out
-1 (LOW) 1.67 Volts 2.14 Volts
0 (INPUT) 2.61 Volts 2.59 Volts
1 (HIGH) 3.33 Volts 2.93 Volts
Beau Schwabe Mask Designer IV - ATL
National Semiconductor Wired Communications Division
500 Pinnacle Court, Suite 525 Mail Stop GA1 Norcross, GA 30071
approximations. Closer values if 1K resistors and a 5K
resistors used are in the table below...
Truth Table:
I/O pin Old Values Out
-1 (LOW) 1.67 Volts 2.14 Volts
0 (INPUT) 2.61 Volts 2.59 Volts
1 (HIGH) 3.33 Volts 2.93 Volts
Beau Schwabe Mask Designer IV - ATL
National Semiconductor Wired Communications Division
500 Pinnacle Court, Suite 525 Mail Stop GA1 Norcross, GA 30071