HP 11848A Service Manual page 111

Model 11848A
Table 8. Schematic Diagram Notes (4 of 11)
Schematic Notes
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DIGITAL SYMBOLOGY REFERENCE INFORMATION
Input and Output Indicators
Implied Indicator—Absence of polarity indicator (see below) implies that the active
state is a relative high voltage level. Absence of negation indicator (see below) im­
plies that the active state is a relative high voltage level at the input or output.
Polarity Indicator—The active state is a relatively low voltage level.
Dynamic Indicator—The active state is a transition from a relative low to a relative
high voltage level.
Inhibit Input—Input that, when active, inhibits (blocks) the active state outputs of a
digital device.
Analog Input—Input that is a continuous signal function (e.g., a sine wave).
Polarity Indicator used with Inhibit Indicator—Indicates that the relatively low level
signal inhibits (blocks) the active state outputs of a digital device.
Output Delay—Binary output changes state only after the referenced input (m) re­
turns to its inactive state (m should be replaced by appropriate dependency or func­
tion symbols).
Open Collector Output.
Open Emitter Output.
Three-state Output—Indicates outputs can have a high impedance (disconnect) state
in addition to the normal binary logic states.
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