74HCT257PW-T 데이터 시트보기 (PDF) - NXP Semiconductors.
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74HCT257PW-T Datasheet PDF : 17 Pages
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NXP Semiconductors
74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
VI 90 %
tW
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 8.
Measurement points are given in Table 8 and 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 resistor.
Test circuit for switching times
Table 9. Test data
Type
Input
VI
tr, tf
74HC257
VCC
6 ns
74HCT257 3 V
6 ns
Load
CL
50 pF
50 pF
RL
1 kΩ
1 kΩ
Switch position
tPHL, tPLH
open
tPZH, tPHZ
GND
open
GND
tPZL, tPLZ
VCC
VCC
74HC_HCT257_5
Product data sheet
Rev. 05 — 13 January 2010
© NXP B.V. 2010. All rights reserved.
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