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| 74HC253 Datasheet, PDF (10/17 Pages) NXP Semiconductors – Dual 4-input multiplexer; 3-state | |||
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NXP Semiconductors
74HC253; 74HCT253
Dual 4-input multiplexer; 3-state
tW
VI 90 %
negative
pulse
VM
10 %
0V
tf
VI
positive
pulse
tr
90 %
VM
10 %
0V
tW
VM
tr
tf
VM
VI
G
VCC
VO
DUT
RT
VCC
RL S1
CL
open
001aad983
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 switching times
Table 9. Test data
Type
Input
VI
tr, tf
74HC253
VCC
6 ns
74HCT253 3 V
6 ns
Load
CL
50 pF
50 pF
RL
1 kΩ
1 kΩ
Switch position
tPHL, tPLH
open
tPZH, tPHZ
GND
open
GND
tPZL, tPLZ
VCC
VCC
74HC_HCT253_3
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 03 â 22 April 2010
© NXP B.V. 2010. All rights reserved.
10 of 17
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