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| 74HC_HCT257_15 Datasheet, PDF (10/18 Pages) NXP Semiconductors – Quad 2-input multiplexer; 3-state | |||
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NXP Semiconductors
74HC257; 74HCT257
Quad 2-input multiplexer; 3-state
9,
W:
QHJDWLYH
SXOVH
90
9
WI
9,
SRVLWLYH
SXOVH
WU
90
9
W:
90
WU
WI
90
9,
*
9&&
92
'87
57
9&&
5/ 6
&/
RSHQ
DDG
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 measuring 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 kï
1 kï
Switch position
tPHL, tPLH
open
tPZH, tPHZ
GND
open
GND
tPZL, tPLZ
VCC
VCC
74HC_HCT257
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 6 â 26 January 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
10 of 18
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