Datasheet

74HC_HCT2G17_1 © NXP B.V. 2006. All rights reserved.
Product data sheet Rev. 01 — 6 October 2006 9 of 18
NXP Semiconductors
74HC2G17; 74HCT2G17
Dual non-inverting Schmitt trigger
14. Transfer characteristics
Test data is given in Table 11.
Definitions test circuit:
R
L
= Load resistance.
C
L
= Load capacitance including jig and probe capacitance.
R
T
= Termination resistance should be equal to output impedance Z
o
of the pulse generator.
Fig 6. Load circuitry for switching times
mgk563
D.U.T
V
CC
V
CC
V
I
V
O
R
T
R
L
= 1 kΩ
C
L
50 pF
open
PULSE
GENERATOR
Table 11. Test data
Type Input Test
V
I
t
r
, t
f
t
PHL
, t
PLH
74HC2G17 GND to V
CC
6 ns open
74HCT2G17 GND to 3.0 V 6 ns open
Table 12. Transfer characteristics
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)
74HC2G17
V
T+
positive-going
threshold voltage
see Figure 7, Figure 8
V
CC
= 2.0 V 1.00 1.18 1.50 1.00 1.50 1.50 V
V
CC
= 4.5 V 2.30 2.60 3.15 2.30 3.15 3.15 V
V
CC
= 6.0 V 3.00 3.46 4.20 3.00 4.20 4.20 V
V
T−
negative-going
threshold voltage
see Figure 7, Figure 8
V
CC
= 2.0 V 0.30 0.60 0.90 0.30 0.90 0.90 V
V
CC
= 4.5 V 1.13 1.47 2.00 1.13 2.00 2.00 V
V
CC
= 6.0 V 1.50 2.06 2.60 1.50 2.60 2.60 V
V
H
hysteresis voltage V
T+
− V
T−
; see Figure 7,
Figure 8 and Figure 9
V
CC
= 2.0 V 0.30 0.60 1.00 0.30 1.00 1.00 V
V
CC
= 4.5 V 0.60 1.13 1.40 0.60 1.40 1.40 V
V
CC
= 6.0 V 0.80 1.40 1.70 0.80 1.70 1.70 V