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 8 of 21
NXP Semiconductors
74HC14; 74HCT14
Hex inverting Schmitt trigger
13. Transfer characteristics
14. Transfer characteristics waveforms
Table 9. Test data
Type Input Load Test
V
I
t
r
, t
f
C
L
74HC14 V
CC
6.0 ns 15 pF, 50 pF t
PLH
, t
PHL
74HCT14 3.0 V 6.0 ns 15 pF, 50 pF t
PLH
, t
PHL
Table 10. Transfer characteristics
At recommended operating conditions; voltages are referenced to GND (ground = 0 V); see Figure 8 and Figure 9.
Symbol Parameter Conditions T
amb
= 25 C T
amb
= 40 C
to +85 C
T
amb
= 40 C
to +125 C
Unit
Min Typ Max Min Max Min Max
74HC14
V
T+
positive-going
threshold
voltage
V
CC
= 2.0 V 0.7 1.18 1.5 0.7 1.5 0.7 1.5 V
V
CC
= 4.5 V 1.7 2.38 3.15 1.7 3.15 1.7 3.15 V
V
CC
= 6.0 V 2.1 3.14 4.2 2.1 4.2 2.1 4.2 V
V
T
negative-going
threshold
voltage
V
CC
= 2.0 V 0.3 0.52 0.9 0.3 0.9 0.3 0.9 V
V
CC
= 4.5 V 0.9 1.4 2.0 0.9 2.0 0.9 2.0 V
V
CC
= 6.0 V 1.2 1.89 2.6 1.2 2.6 1.2 2.6 V
V
H
hysteresis
voltage
V
CC
= 2.0 V 0.2 0.66 1.0 0.2 1.0 0.2 1.0 V
V
CC
= 4.5 V 0.4 0.98 1.4 0.4 1.4 0.4 1.4 V
V
CC
= 6.0 V 0.6 1.25 1.6 0.6 1.6 0.6 1.6 V
74HCT14
V
T+
positive-going
threshold
voltage
V
CC
= 4.5 V 1.2 1.41 1.9 1.2 1.9 1.2 1.9 V
V
CC
= 5.5 V 1.4 1.59 2.1 1.4 2.1 1.4 2.1 V
V
T
negative-going
threshold
voltage
V
CC
= 4.5 V 0.5 0.85 1.2 0.5 1.2 0.5 1.2 V
V
CC
= 5.5 V 0.6 0.99 1.4 0.6 1.4 0.6 1.4 V
V
H
hysteresis
voltage
V
CC
= 4.5 V 0.4 0.56 - 0.4 - 0.4 - V
V
CC
= 5.5 V 0.4 0.6 - 0.4 - 0.4 - V
Fig 8. Transfer characteristics Fig 9. Transfer characteristics definitions
mna207
V
O
V
I
V
H
V
T+
V
T−
mna208
V
O
V
I
V
H
V
T+
V
T−