HD74AC14
Hex Inverter Schmitt Trigger
Description
The HD74AC14 contains six logic inverters which accept standard CMOS input signals (TTL levels for
HD74ACT14) and provide standard CMOS output levels. They are capable of transforming slowly
changing input signals into sharply defined, jitter-free output signals. In addition, they have a greater noise
margin than conventional inverters.
The HD74AC14 has hysteresis between the positive-going and negative-going input thresholds (typically
1.0 V) which is determined internally by transistor ratios and is essentially insensitive to temperature and
supply voltage variations.
Feature
Outputs Source/Sink 24 mA
Pin Arrangement
1
2
3
4
5
6
7
14
13
12
11
10
9
8
GND
V
CC
(Top view)
HD74AC14
2
Function Table
Input
Output
A
O
L
H
H
L
DC Characteristics (unless otherwise specified)
Item
Symbol
V
CC
(V) HD74AC14
HD74ACT14 Unit
Condition
Maximum quiescent supply
current
I
CC
40
40
A
V
IN
= V
CC
or ground,
V
CC
= 5.5 V,
Ta = Wordt case
Maximum quiescent supply
current
I
CC
4.0
4.0
A
V
IN
= V
CC
or ground,
V
CC
= 5.5 V,
Ta = 25
C
Maximum positive threshold
Vt
+
3.0
2.2
2.0
V
Ta = Worst case
4.5
3.2
5.5
3.9
Minimum negative threshold
Vt
3.0
0.5
0.8
V
Ta = Worst case
4.5
0.9
5.5
1.1
Maximum hysteresis
Vh (max) 3.0
1.2
1.2
V
Ta = Worst case
4.5
1.4
5.5
1.6
Minimum hysteresis
Vh (min)
3.0
0.3
0.4
V
Ta = Worst case
4.5
0.4
5.5
0.5
HD74AC14
3
AC Characteristics
Ta = +25
C
C
L
= 50 pF
Ta = 40
C to +85
C
C
L
= 50 pF
Item
Symbol
V
CC
(V)*
1
Min
Typ
Max
Min
Max
Unit
Propagation delay
t
PLH
3.3
1.0
9.5
13.5
1.0
15.0
ns
5.0
1.0
7.0
10.0
1.0
11.0
Propagation delay
t
PHL
3.3
1.0
7.5
11.5
1.0
13.0
ns
5.0
1.0
6.0
8.5
1.0
9.5
Note:
1. Voltage Range 3.3 is 3.3 V
0.3 V
Voltage Range 5.0 is 5.0 V
0.5 V
Capacitance
Item
Symbol
Typ
Unit
Condition
Input capacitance
C
IN
4.5
pF
V
CC
= 5.5 V
Power dissipation capacitance
C
PD
25.0
pF
V
CC
= 5.0 V
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
DP-14
Conforms
Conforms
0.97 g
Unit: mm
7.62
0.25
0
15
19.20
20.32 Max
1
8
14
7
1.30
2.54
0.25
0.48
0.10
6.30
7.40 Max
0.51 Min
2.54 Min
5.06 Max
+ 0.10
0.05
2.39 Max
Hitachi Code
JEDEC
EIAJ
Weight (reference value)
FP-14DA
--
Conforms
0.23 g
Unit: mm
*Dimension including the plating thickness
Base material dimension
*0.22
0.05
*0.42
0.08
0.70
0.20
0.12
0.15
0
8
M
0.10
0.10
2.20 Max
5.5
10.06
1.42 Max
14
8
1
7
10.5 Max
+ 0.20
0.30
7.80
1.15
1.27
0.40
0.06
0.20
0.04
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