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HD74HCT1G66
Rev.7.00, Jan.29.2004, page 6 of 8
GND
(OFF)
A
V
C
= V
IL
V
CC
V
CC
V
CC
V
CC
V
IN
= V
CC
or GND
V
OUT
= GND
or V
CC
V
C
= V
IH
V
IN
= V
CC
or GND
GND
(ON)
A
V
OUT
OPEN
• I
S
(off), I
S
(on)
GND
(ON)
V
C
= V
IH
V
IN
V
IN
V
OH
V
OL
t
PLH
t
PHL
V
CC
V
CC
V
OUT
V
OUT
R
L
=
10 kΩ
C
L
=
50 pF
3 V
GND
90% 90%
1.3V 1.3V
1.3V 1.3V
10%10%
• t
PLH
, t
PHL
t
r
= 6 ns t
f
= 6 ns
GND
GND
Item S1 S2
V
C
V
C
V
OH
V
OL
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
OUT
V
OUT
t
LZ
t
ZL
t
HZ
t
ZH
V
IN
t
ZH
C
L
=
50 pF
R
L
=
1 kΩ
3 V
GND
GND
90% 90%
1.3V 1.3V
1.3V
10%10%
Waveform - A
Waveform - B
GND
t
ZL
GND
t
HZ
GND
t
LZ
S1
R =
1 k
L
Ω
S2
90%
1.3V
10%
•
t
ZH
, t
ZL
/ t
HZ
, t
LZ
t
r
= 6 ns t
f
= 6 ns
Notes: 1. Waveform - A is for an output with internal conditions such that the output is high
except when disabled by the output control.
2. Waveform - B is for an output with internal conditions such that the output is low
except when disabled by the output control.