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| 74HC393 Datasheet, PDF (12/21 Pages) NXP Semiconductors – Dual 4-bit binary ripple counter | |||
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NXP Semiconductors
74HC393; 74HCT393
Dual 4-bit binary ripple counter
VI 90 %
tW
negative
pulse
VM
10 %
0V
tf
tr
VI
positive
pulse
90 %
VM
10 %
0V
tW
Measurement points are given in Table 8.
a. Input pulse definition
90 %
VM
tr
tf
VM
10 %
001aac221
VCC
PULSE
VI
GENERATOR
VO
D.U.T.
RT
CL
mna101
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.
b. Test circuit
Fig 11. Test circuit for measuring switching times
Table 9. Test data
Type
Input
VI
tr, tf
74HC393
VCC
6 ns
74HCT393
3V
6 ns
Load
CL
15 pF, 50 pF
15 pF, 50 pF
74HC_HCT393
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 â 16 May 2013
© NXP B.V. 2013. All rights reserved.
12 of 21
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