Datasheet

74HC_HCT7540 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 4 — 31 December 2012 9 of 16
NXP Semiconductors
74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
12. Transfer characteristics
13. Transfer characteristics waveforms
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
74HC7540
V
T+
positive-going
threshold
voltage
V
CC
= 2.0 V - - 1.5 - 1.5 - 1.5 V
V
CC
= 4.5 V - - 3.15 - 3.15 - 3.15 V
V
CC
= 6.0 V - - 4.2 - 4.2 - 4.2 V
V
T
negative-going
threshold
voltage
V
CC
= 2.0 V 0.3 - - 0.3 - 0.3 - V
V
CC
= 4.5 V 1.35 - - 1.35 - 1.35 - V
V
CC
= 6.0 V 1.8 - - 1.8 - 1.8 - V
V
H
hysteresis
voltage
V
CC
= 2.0 V 0.1 0.20 - 0.1 - 0.1 - V
V
CC
= 4.5 V 0.25 0.40 - 0.25 - 0.25 - V
V
CC
= 6.0 V 0.3 0.5 - 0.3 - 0.3 - V
74HCT7540
V
T+
positive-going
threshold
voltage
V
CC
= 4.5 V - - 2.0 - 2.0 - 2.0 V
V
CC
= 5.5 V - - 2.1 - 2.1 - 2.1 V
V
T
negative-going
threshold
voltage
V
CC
= 4.5 V 0.7 - - 0.64 - 0.6 - V
V
CC
= 5.5 V 0.8 - - 0.74 - 0.7 - V
V
H
hysteresis
voltage
V
CC
= 4.5 V 0.17 0.23 - - - - - V
V
CC
= 5.5 V 0.17 0.23 - - - - - 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−