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1.2 Parallel Communication Adapter Specifications
1.2.1 Electrical characteristics of I/O signal lines
Figure 1.2.1 shows the electrical characteristics of the I/O signal lines.
Electrical characteristics of I/O signal lines
The signal levels of the I/O signal lines are indicated below. Figure 1.2.1 shows the electrical
characteristics.
"L": 0 to + 0.4 V
"H": + 2.4 to + 5.0 V
The power supply signal is directly connected to +5 V.
Control signal line
communications
Control signal line
DATA0 to DATA7
Input conditions
1 K Ω
Parallel
connector
Output conditions
74LS06 or equivalent
I/O conditions
74LS374 or equivalent
74LS374 or equivalent
Figure 1.2.1 Electrical characteristics of I/O signal lines
+5 V
74LS14 or equivalent
100 Ω
1000 pF
+5 V
1 K Ω
Parallel
*
communications
connector
+5 V
4.7 K Ω
27 Ω
Parallel
communications
connector
5
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