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| 74HC7540D Datasheet, PDF (8/16 Pages) NXP Semiconductors – Octal Schmitt trigger buffer/line driver; 3-state; inverting Rev. 4 — 31 December 2012 | |||
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NXP Semiconductors
74HC7540; 74HCT7540
Octal Schmitt trigger buffer/line driver; 3-state; inverting
tW
VI 90 %
negative
pulse
VM
10 %
0V
tf
VI
positive
pulse
tr
90 %
VM
10 %
0V
tW
VM
tr
tf
VM
VI
G
VCC
VO
DUT
RT
VCC
RL S1
CL
open
001aad983
Fig 7.
Test data is given in Table 9.
Definitions test circuit:
RT = Termination resistance should be equal to output impedance Zo of the pulse generator
CL = Load capacitance including jig and probe capacitance
RL = Load resistance
S1 = Test selection switch
Test circuit for measuring switching times
Table 9. Test data
Type
Input
VI
tr, tf
74HC7540
VCC
6 ns
74HCT7540
3V
6 ns
Load
CL
15 pF, 50 pF
15 pF, 50 pF
RL
1 kï
1 kï
S1 position
tPHL, tPLH
open
open
tPZH, tPHZ
GND
GND
tPZL, tPLZ
VCC
VCC
74HC_HCT7540
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 â 31 December 2012
© NXP B.V. 2012. All rights reserved.
8 of 16
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