74LVT245B 查看數據表（PDF） - NXP Semiconductors.
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74LVT245B Datasheet PDF : 15 Pages
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Nexperia
74LVT245B
3.3 V octal transceiver with direction pin (3-state)
Table 8. Measurement points
VCC
2.7 V to 3.6 V
Input
VIN
GND to 2.7 V
VM
1.5 V
Output
VM
1.5 V
Vx
VOL + 0.3 V
Vy
VOH − 0.3 V
tW
VI 90 %
negative
pulse
VM
10 %
0V
tf
VI
positive
pulse
tr
90 %
VM
10 %
0V
tW
VM
tr
tf
VM
VCC
VI
PULSE
GENERATOR
VO
DUT
RT
VEXT
RL
CL
RL
001aae235
Fig 7.
Test data is given in Table 9.
Definitions 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 switching times
Table 9.
Input
VI
2.7 V
Test data
fi
≤ 10 MHz
tW
500 ns
tr, tf
≤ 2.5 ns
Load
RL
500 Ω
CL
50 pF
VEXT
tPHZ, tPZH
GND
tPLZ, tPZL
6V
tPLH, tPHL
open
74LVT245B_2
Product data sheet
Rev. 02 — 8 May 2008
© Nexperia B.V. 2017. All rights reserved
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