Datasheet

74HC_HCT2G17_1 © NXP B.V. 2006. All rights reserved.
Product data sheet Rev. 01 — 6 October 2006 10 of 18
NXP Semiconductors
74HC2G17; 74HCT2G17
Dual non-inverting Schmitt trigger
15. Waveforms transfer characteristics
74HCT2G17
V
T+
positive-going
threshold voltage
see Figure 7 and Figure 8
V
CC
= 4.5 V 1.20 1.58 1.90 1.20 1.90 1.90 V
V
CC
= 5.5 V 1.40 1.78 2.10 1.40 2.10 2.10 V
V
T−
negative-going
threshold voltage
see Figure 7 and Figure 8
V
CC
= 4.5 V 0.50 0.87 1.20 0.50 1.20 1.20 V
V
CC
= 5.5 V 0.60 1.11 1.40 0.60 1.40 1.40 V
V
H
hysteresis voltage V
T+
− V
T−
; see Figure 7,
Figure 8 and Figure 10
V
CC
= 4.5 V 0.40 0.71 - 0.40 - - V
V
CC
= 5.5 V 0.40 0.67 - 0.40 - - V
Table 12. Transfer characteristics
…continued
Voltages are referenced to GND (ground = 0 V); for test circuit see Figure 6.
Symbol Parameter Conditions 25 °C −40 °C to +125 °C Unit
Min Typ Max Min Max
(85 °C)
Max
(125 °C)
V
T+
and V
T-
limits at 70 % and 20 %.
Fig 7. Transfer characteristic Fig 8. Definition of V
T+
, V
T-
and V
H
mnb154
V
O
V
H
V
I
V
T+
V
T−
mnb155
V
O
V
I
V
H
V
T+
V
T−