Agilent Technologies 2712A, 2948 manual Llzble 8-1.Schematic Diagram Notes 4

Model 8904A Service

llzble 8-1.Schematic Diagram Notes (4 of 11)

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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