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74AHC_AHCT257 Scheda tecnica(PDF) 10 Page - NXP Semiconductors

Il numero della parte 74AHC_AHCT257
Spiegazioni elettronici  Quad 2-input multiplexer; 3-state
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Produttore elettronici  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74AHC_AHCT257 Scheda tecnica(HTML) 10 Page - NXP Semiconductors

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74AHC_AHCT257_2
© NXP B.V. 2008. All rights reserved.
Product data sheet
Rev. 02 — 9 May 2008
10 of 16
NXP Semiconductors
74AHC257; 74AHCT257
Quad 2-input multiplexer; 3-state
11. Waveforms
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 6.
Data inputs and common data select input to output propagation delays
mna486
tPHL
tPLH
VM
VM
nI0, nI1, S
input
nY output
GND
VI
VOH
VOL
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 7.
Enable and disable times
mna813
tPLZ
tPHZ
outputs
disabled
outputs
enabled
VY
VX
outputs
enabled
Qn output
LOW-to-OFF
OFF-to-LOW
Qn output
HIGH-to-OFF
OFF-to-HIGH
OE input
VOL
VOH
VCC
VI
VM
GND
GND
tPZL
tPZH
VM
VM
Table 8.
Measurement points
Type
Input
Output
VM
VM
VX
VY
74AHC257
0.5
× VCC
0.5
× VCC
VOL + 0.3 V
VOH − 0.3 V
74AHCT257
1.5 V
0.5
× VCC
VOL + 0.3 V
VOH − 0.3 V


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