A-1
A
Specifications
This appendix provides specifications for the DDA-06 board.
Table A-1. Digital I/O Specifications
Feature
Specification
Type
8255 P.P.I.
Number
24 lines ( three 8-bit ports)
Control
Each port software-programmable as input
or output; supports all 8255 operating
modes
TTL/DTL/CMOS
compatible input
characteristics
Logic low level:
−
0.5 V minimum to
+0.8 V maximum
Logic high level: +2.0 V minimum to
+5.0 V maximum
Input current: ±10 µA (logic high or low)
TTL/DTL/CMOS
compatible output
characterstics
Output low sink current: 1.7 mA at V
ol
=
0.45 V
Output high:
−
200 µA at V
oh
= 2.4 V
Source current (Darlington drive current):
−
1 mA minimum;
−
4 mA maximum at
1.5 V (available on any eight pins
simultaneously from PB and PC ports)
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