Datasheet

74HC_HCT14 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 6 — 19 September 2012 6 of 21
NXP Semiconductors
74HC14; 74HCT14
Hex inverting Schmitt trigger
11. Dynamic characteristics
[1] t
pd
is the same as t
PHL
and t
PLH
.
[2] t
t
is the same as t
THL
and t
TLH
.
[3] C
PD
is used to determine the dynamic power dissipation (P
D
in W):
P
D
=C
PD
 V
CC
2
 f
i
 N+ (C
L
 V
CC
2
 f
o
) where:
f
i
= input frequency in MHz;
f
o
= output frequency in MHz;
C
L
= output load capacitance in pF;
V
CC
= supply voltage in V;
N = number of inputs switching;
 (C
L
 V
CC
2
 f
o
) = sum of outputs.
Table 7. Dynamic characteristics
GND = 0 V; C
L
=50pF; for test circuit see Figure 7.
Symbol Parameter Conditions T
amb
= 25 C T
amb
= 40 C to
+125 C
Unit
Min Typ Max Max
(85 C)
Max
(125 C)
74HC14
t
pd
propagation delay nA to nY; see Figure 6
[1]
V
CC
= 2.0 V - 41 125 155 190 ns
V
CC
= 4.5 V - 15 25 31 38 ns
V
CC
= 5.0 V; C
L
=15pF - 12 - - - ns
V
CC
= 6.0 V - 12 21 26 32 ns
t
t
transition time see Figure 6
[2]
V
CC
= 2.0 V - 19 75 95 110 ns
V
CC
= 4.5 V - 7 15 19 22 ns
V
CC
= 6.0 V - 6 13 15 19 ns
C
PD
power dissipation
capacitance
per package; V
I
=GNDtoV
CC
[3]
-7- - -pF
74HCT14
t
pd
propagation delay nA to nY; see Figure 6
[1]
V
CC
= 4.5 V - 20 34 43 51 ns
V
CC
= 5.0 V; C
L
=15pF - 17 - - - ns
t
t
transition time V
CC
= 4.5 V; see Figure 6
[2]
- 7 15 19 22 ns
C
PD
power dissipation
capacitance
per package;
V
I
=GNDtoV
CC
 1.5 V
[3]
-8- - -pF