74HC688DB 查看數據表（PDF） - Nexperia B.V. All rights reserved
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74HC688DB Datasheet PDF : 16 Pages
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Nexperia
74HC688
8-bit magnitude comparator
10.1 Waveforms and test circuit
VI
Pn, Qn input
VM
VM
GND
tPHL
tPLH
VOH
P=Q output
VOL
VY
VM
VX
tTHL
VY
VM
VX
tTLH
aaa-028706
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Figure 6. Waveforms showing the word inputs (Pn, Qn) to the equal to output (P=Q) propagation delays and the
output transition times.
VI
E input
VM
VM
GND
tPHL
tPLH
VOH
P=Q output
VOL
VY
VM
VX
tTHL
VY
VM
VX
tTLH
aaa-028705
Measurement points are given in Table 8.
VOL and VOH are typical voltage output levels that occur with the output load.
Figure 7. Waveforms showing the enable input (E) to the equal to output (P=Q) propagation delays and the output
transition times.
Table 8. Measurement points
Input
VI
VM
GND to VCC
0.5VCC
Output
VM
0.5VCC
VX
0.1VCC
VY
0.9VCC
74HC688
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 4 July 2018
© Nexperia B.V. 2018. All rights reserved.
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