TM 9-4935-601-14-7&P
Model 8640B
NOTE
The term "binary coded decimal"
(or BCD) refers to four-bit binary
circuits that range from decimal 0 to
9 in 8421 code.
The term "binary", when applied
to four-bit binary circuits, refers to
circuits that range from decimal 0 to
15 in 8421 code.
8-43. Trigger (T) inputs are usually high-going (edge
sensitive) unless there is a circle at the input (which
would make them low-going). All other inputs are
usually level sensitive.
Table 8-2. Logic Levels
Logic Voltage Levels
LOGIC TTL ECL EECL
High (1) >, 2V > -0.5V --0.1
Low (0) < O.SV < -.5V < -.6V
< = more negative than
> = more positive than
Input Conditioning
INPUT TTL ECL EECL
Grounded Low (0) High (1) High (1)
Open High (1) Low (0) Low (0)
Ground = OV
Figure 8-3. Binary Symbols
8-6
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