74HC257 查看數據表（PDF） - NXP Semiconductors.
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74HC257 Datasheet PDF : 17 Pages
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NXP Semiconductors
11. Waveforms
74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
VI
input
S, nI0, nI1
GND
VOH
output
nY
VOL
VM
t PHL
VM
t THL
VM
VM
10 %
t PLH
90 %
t TLH
001aad477
Fig 6.
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Propagation delays input (S, nI0, nI1) to output (nY) and output (nY) transition times
VI
OE input
10 %
GND
output VCC
LOW-to-OFF
OFF-to-LOW
VOL
output VOH
HIGH-to-OFF
OFF-to-HIGH
GND
tr
90 %
VM
tPLZ
tPHZ
outputs
enabled
10 %
90 %
tf
tPZL
VM
tPZH
outputs
disabled
VM
outputs
enabled
001aac479
Fig 7.
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
3-state output enable and disable times
Table 8. Measurement points
Type
74HC257
74HCT257
Input
VM
0.5VCC
1.3 V
Output
VM
0.5VCC
1.3 V
74HC_HCT257_5
Product data sheet
Rev. 05 — 13 January 2010
© NXP B.V. 2010. All rights reserved.
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