74LVC245ADB(2009) 查看數據表（PDF） - NXP Semiconductors.
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74LVC245ADB Datasheet PDF : 17 Pages
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NXP Semiconductors
74LVC245A; 74LVCH245A
Octal bus transceiver; 3-state
VI 90 %
tW
negative
pulse
VM
10 %
0V
tf
VI
positive
pulse
tr
90 %
VM
10 %
0V
tW
VI
G
VCC
VO
DUT
RT
VM
tr
tf
VM
VEXT
RL
CL
RL
001aae331
Fig 7.
Test data is given in Table 9.
Definitions for test circuit:
RL = Load resistance.
CL = Load capacitance including jig and probe capacitance.
RT = Termination resistance should be equal to output impedance Zo of the pulse generator.
VEXT = External voltage for measuring switching times.
Test circuit for measuring switching times
Table 9. Test data
Supply voltage
1.2 V
2.7 V
3.0 V to 3.6 V
Input
VI
VCC
2.7 V
2.7 V
tr, tf
≤ 2.5 ns
≤ 2.5 ns
≤ 2.5 ns
[1] The circuit performs better when RL = 1 kΩ.
Load
CL
50 pF
50 pF
50 pF
RL
500 Ω[1]
500 Ω
500 Ω
VEXT
tPLH, tPHL
open
open
open
tPLZ, tPZL
2 × VCC
2 × VCC
2 × VCC
tPHZ, tPZH
GND
GND
GND
74LVC_LVCH245A_5
Product data sheet
Rev. 05 — 25 August 2009
© NXP B.V. 2009. All rights reserved.
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