HD74AC datasheet(28/52 Pages) HITACHI

28 / 52 page

Definition of Specifications

OUTPUT

CONTROL

DATA

OUT

Vmi

Vmo

10% VCC

Gnd

tLZ

tZL

Vmi = 50% V

CC for HD74AC devices; 1.5 V for HD74ACT devices

Vmo = 50% V

CC for HD74AC/HD74ACT devices

Figure 6 3-State Output Low Enable and Disable Times

3.6 Electrostatic Discharge

Precautions should be taken to prevent damage to devices by electrostatic discharge. Static charge tends to

accumulate on insulated surfaces such as synthetic fabrics or carpeting, plastic sheets, trays, foam, tubes or

bags, and on ungrounded electrical tools or appliances. The problem is much worse in a dry atmosphere.

In general, it is recommended that individuals take the precaution of touching a known ground before

handling devices. More often, handling equipment that is not properly grounded, causes damage to parts.

Ensure that all plastic parts of the tester, that are near the device, are conductive and connected to ground.

DATA

CONTROL

INPUT

CLEAR

Vmi

tsu

trec

Vmi = 50% V

CC for HD74AC devices; 1.5 V for HD74ACT devices

Vmo = 50% V

CC for HD74AC/HD74ACT devices

Figure 7 Setup Time, Hold Time and Recovery Time

HD74AC Datasheet(PDF) 28 Page - Hitachi Semiconductor