Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

C1 1D

IEC

IEC transparent D latch (rectangular form)

The transparent latch is drawn like the D flip-flop but the C1 input has no dynamic wedge. While C1 is at its internal 1 state, the output follows the 1D input; when C1 returns to 0 the last value is held. TI's overview describes this as a level-operated control input.

Drawing use

Schematic

Application

Logic & signals

Reference family

IEC / Manufacturer

Form evidence

Rectangular bistable with static C1 and 1D inputs. Qualifying-symbol and dependency conventions as explained in TI's public overview of IEEE Std 91-1984, which incorporates IEC 617-12 work. Independent educational drawing; not certified IEC geometry or an IEC database identifier. The counterpart is the matching functional concept; no equivalence of every detailed standard graphic is asserted.

A distinction that matters

The IEC D flip-flop has a dynamic wedge on C1 and captures only at the edge.

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D-LATCH

Symbols

Transparent D latch

Follows the input data while its latch-enable condition is active and retains it when that condition ends.

Drawing use

Schematic

Application

Logic & signals

Reference family

Manufacturer

A distinction that matters

A transparent latch is level-sensitive; a D flip-flop captures data at a defined clock transition.

Full referenceAdd to legend

Original educational previews. Follow the source references on each full entry for the appropriate standard or selected product.