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74HCT257PW Arkusz danych(PDF) 9 Page - NXP Semiconductors

Numer części 74HCT257PW
Szczegółowy opis  Quad 2-input multiplexer; 3-state
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Strona internetowa  http://www.nxp.com
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74HCT257PW Arkusz danych(HTML) 9 Page - NXP Semiconductors

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74HC_HCT257_5
© NXP B.V. 2010. All rights reserved.
Product data sheet
Rev. 05 — 13 January 2010
9 of 17
NXP Semiconductors
74HC257; 74HCT257
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.
Propagation delays input (S, nI0, nI1) to output (nY) and output (nY) transition times
001aad477
tPLH
tPHL
VM
VM
90 %
10 %
VM
VM
output
nY
input
S, nI0, nI1
VI
GND
VOH
VOL
tTLH
tTHL
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Fig 7.
3-state output enable and disable times
001aac479
tPLZ
tPHZ
outputs
disabled
outputs
enabled
90 %
10 %
outputs
enabled
OE input
VI
VCC
VOL
VOH
GND
GND
VM
tPZL
tPZH
VM
VM
output
LOW-to-OFF
OFF-to-LOW
output
HIGH-to-OFF
OFF-to-HIGH
tr
tf
90 %
10 %
Table 8.
Measurement points
Type
Input
Output
VM
VM
74HC257
0.5VCC
0.5VCC
74HCT257
1.3 V
1.3 V


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