HP 11848A Service Manual page 117

Model 11848A
Schematic Notes
Table 8. Schematic Diagram Notes (10 of 11)
Active High Input
Active High Output
Active Low Input
Active Low Output
b
Low-to-High
Edge Sensitive
t>
High-to-Low
Edge Sensitive
Delayed Output
(Active High Input)
Delayed Output
(Active Low Input)
i
T
ACTIVE LEVELS
J\
■ A C T I V E ! "
LEVEL .
\ ACTIVE HIGH inputs and outputs are indicated by the ab­
sence of the polarity indicator symbol.
• • ACTIVE LOW inputs and outputs are indicated by the pres-
L ~ ~ V
X
J ence of the polarity indicator symbol ( t ^ ) .
_JACTIVEU_
• LEVEL •
INPUT
4
OUTPUT •
INPUT /
OUTPUT
INPUT /
OUTPUT
INPU*TA
OUTPUT
EDGE SENSITIVE INPUTS
EDGE SENSITIVE (low-to-high) inputs are indicated by the
presence of the dynamic indicator symbol ( — h ) .
EDGE SENSITIVE (high-to-low) inputs are indicated by the
presence of both the dynamic indicator and the polarity in­
dicator symbols ( - * K ) .
DELAYED OUTPUT RESPONSE
Xr
OUTPUT DELAY indicator symbol ( ~ \ ) shows that the out­
put becomes effective after the input signal returns to its
inactive state.
INHIBIT INPUTS
INHIBIT indicator symbol (+) indicates an input that, when
active, inhibits (blocks) the output(s) from achieving their
active states (the outputs remain inactive).
ANALOG LINES
ANALOG indicator symbol ( H ) indicates a line that has
an analog input or output.
NONLOGIC CONNECTION
The Nonlogic Connection symbol (X) indicates a connec­
tion that does not carry any logic information.
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