HD74AC datasheet(31/52 Pages) HITACHI

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Definition of Specifications

Symbol

Term

Description

rec

Recovery time

Time period between the time when data at the

specified input terminal is released and the time

when another related input terminal (e.g., clock

input) can be changed

Input capacitance

Capacitance between GND terminal and an input

terminal to which 0 V is applied

Power Dissipation Capacitance

Equivalent device power capacitance in dynamic

state

Table 7

Explanation of Symbols Used in Function Tables

Symbol

Description

High level (in steady state; written H or "H" level in sentences)

Low level (in steady state; written L or "L" level in sentences)

Transition from L level to H level

Transition from H level to L level

Either H or L

3-state output off (high impedance)

a·····h

Input level of steady state for each of inputs A-H

Q level immediately before the indicated input condition is established

Complement of Q

Q level immediately before the latest active change (

) occurs

Single H level pulse

Single L level pulse

TOGGLE

Each output is changed to the complement of the preceding state by an active input

change (

)

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