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5.2 Parallel Interface Specifications
This parallel interface supports the bi-directional data transfer in nibble mode of the IEEE 1284 standard. It is
also compatible with the conventional Centronics interface.
5.2.1 Hardware requirements
Signal levels:
TTL-compatible
0.0 to +0.4 V for low level
+2.4 to +5.0 V for high level
Output circuit:
SN74LS07 or equivalent
+5 V
1 kΩ
+5 V
3.3 kΩ
100 Ω
1000 pF
+5 V
R
DSTB
INPRM
DATA 1-8
Auto Feed XT
SLCT-IN
Signal
DATA 1-8
Auto Feed XT
SLCT-IN
R
3.3 kΩ
1 kΩ
3.3 kΩ
Figure 5.3 Parallel interface input circuits
Figure 5.2 Parallel interface output circuit
Input circuit:
SN74LS14 or equivalent