74AHC257 데이터 시트보기 (PDF) - NXP Semiconductors.
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74AHC257 Datasheet PDF : 16 Pages
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Nexperia
11. Waveforms
74AHC257; 74AHCT257
Quad 2-input multiplexer; 3-state
nI0, nI1, S
input
VI
GND
nY output
VOH
VOL
VM
t PHL
VM
t PLH
mna486
Fig 6.
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Data inputs and common data select input to output propagation delays
VI
OE input
GND
VCC
Qn output
LOW- to - OFF
OFF- to - LOW
VOL
VOH
Qn output
HIGH - to - OFF
OFF- to - HIGH
GND
VM
t PLZ
t PZL
t PHZ
VX
VY
outputs
enabled
VM
t PZH
outputs
disabled
VM
outputs
enabled
mna813
Fig 7.
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Enable and disable times
Table 8. Measurement points
Type
Input
74AHC257
74AHCT257
VM
0.5 × VCC
1.5 V
Output
VM
0.5 × VCC
0.5 × VCC
VX
VOL + 0.3 V
VOL + 0.3 V
VY
VOH − 0.3 V
VOH − 0.3 V
74AHC_AHCT257_2
Product data sheet
Rev. 02 — 9 May 2008
© Nexperia B.V. 2017. All rights reserved
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