HD74AC Datasheet, PDF (28/52 Pages) Hitachi Semiconductor – HD74AC Series Common Information

Definition of Specifications
OUTPUT
CONTROL
DATA
OUT
t_ZL
Vmo
Vmi
t_LZ
10% V_CC
Gnd
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
IN
CONTROL
INPUT
MR
OR
CLEAR
Vmi
t_su
t_h
Vmi
t_su
t_rec
Vmi
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
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