Datasheet

74VHC_VHCT14_1 © NXP B.V. 2009. All rights reserved.
Product data sheet Rev. 01 — 17 August 2009 8 of 16
NXP Semiconductors
74VHC14; 74VHCT14
Hex inverting Schmitt trigger
12. Transfer characteristics
13. Transfer characteristics waveforms
Table 9. Test data
Type Input Load Test
V
I
t
r
, t
f
C
L
74VHC14 V
CC
≤ 3.0 ns 50 pF, 15 pF t
PLH
, t
PHL
74VHCT14 3.0 V ≤ 3.0 ns 50 pF, 15 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 25 °C −40 °C to +85 °C −40 °C to +125 °C Unit
Min Typ Max Min Max Min Max
74VHC14
V
T+
positive-going
threshold
voltage
V
CC
= 3.0 V - - 2.2 - 2.2 - 2.2 V
V
CC
= 4.5 V - - 3.15 - 3.15 - 3.15 V
V
CC
= 5.5 V - - 3.85 - 3.85 - 3.85 V
V
T−
negative-going
threshold
voltage
V
CC
= 3.0 V 0.9 - - 0.9 - 0.9 - V
V
CC
= 4.5 V 1.35 - - 1.35 - 1.35 - V
V
CC
= 5.5 V 1.65 - - 1.65 - 1.65 - V
V
H
hysteresis
voltage
V
CC
= 3.0 V 0.3 - 1.2 0.3 1.2 0.25 1.2 V
V
CC
= 4.5 V 0.4 - 1.4 0.4 1.4 0.35 1.4 V
V
CC
= 5.5 V 0.5 - 1.6 0.5 1.6 0.45 1.6 V
74VHCT14
V
T+
positive-going
threshold
voltage
V
CC
= 4.5 V - - 1.9 - 1.9 - 1.9 V
V
CC
= 5.5 V - - 2.1 - 2.1 - 2.1 V
V
T−
negative-going
threshold
voltage
V
CC
= 4.5 V 0.5 - - 0.5 - 0.5 - V
V
CC
= 5.5 V 0.6 - - 0.6 - 0.6 - V
V
H
hysteresis
voltage
V
CC
= 4.5 V 0.4 - 1.4 0.4 1.4 0.35 1.4 V
V
CC
= 5.5 V 0.4 - 1.5 0.4 1.5 0.35 1.5 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−