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74HCT240 数据表(PDF) 10 Page - NXP Semiconductors

部件名 74HCT240
功能描述  Octal buffer/line driver; 3-state; inverting
PDF  18 Pages
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制造商  NXP [NXP Semiconductors]
网页  http://www.nxp.com
标志 NXP - NXP Semiconductors

74HCT240 数据表(HTML) 10 Page - NXP Semiconductors

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74HC_HCT240_3
© NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 03 — 2 August 2007
10 of 18
NXP Semiconductors
74HC240; 74HCT240
Octal buffer/line driver; 3-state; inverting
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.
Fig 8.
Load circuitry for measuring switching times
VM
VM
tW
tW
10 %
90 %
0 V
VI
VI
negative
pulse
positive
pulse
0 V
VM
VM
90 %
10 %
tf
tr
tr
tf
001aad983
DUT
VCC
VCC
VI
VO
RT
RL
S1
CL
open
PULSE
GENERATOR
Table 9.
Test data
Type
Input
Load
S1 position
VI
tr, tf
CL
RL
tPHL, tPLH
tPZH, tPHZ
tPZL, tPLZ
74HC240
VCC
6 ns
15 pF, 50 pF
1 k
Ω
open
GND
VCC
74HCT240
3 V
6 ns
15 pF, 50 pF
1 k
Ω
open
GND
VCC



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