74HC85DB View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
Manufacturer
74HC85DB Datasheet PDF : 19 Pages
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Nexperia
74HC85; 74HCT85
4-bit magnitude comparator
11.1 Waveforms and test circuit
VI
An, Bn, In input
VM
GND
tPHL
tPLH
VOH
Qn output
VOL
VY
VM
VX
tTHL
tTLH
aaa-028464
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Figure 7. Word A inputs (An), word B inputs (Bn) and expansion inputs (In) to the outputs (Qn) propagation delays
and the output transition times
Table 8. Measurement points
Type
Input
VI
74HC85
VCC
74HCT85
3V
VM
0.5VCC
1.3 V
Output
VM
0.5VCC
1.3 V
VX
0.1 VCC
0.1 VCC
VY
0.9 VCC
0.9 VCC
VI 90 %
negative
pulse
GND
VI
positive
pulse
GND 10 %
VM
10 %
tf
tr
90 %
VM
VI
G
RT
tW
tW
VCC
DUT
VM
tr
tf
VM
VO
CL
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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.
Figure 8. Test circuit for measuring switching times
74HC_HCT85
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 20 April 2018
© Nexperia B.V. 2018. All rights reserved.
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