74HC4520 查看數據表（PDF） - NXP Semiconductors.
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74HC4520 Datasheet PDF : 17 Pages
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Nexperia
74HC4520; 74HCT4520
Dual 4-bit synchronous binary counter
Table 8. Measurement points
Type
Input
74HC4520
74HCT4520
VM
0.5 VCC
1.3 V
VI
GND to VCC
GND to 3 V
Output
VM
0.5 VCC
1.3 V
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 7.
Test data is given in Table 9.
Test circuit definitions:
RT = Termination resistance should be equal to output impedance Zo of the pulse generator
CL = Load capacitance including jig and probe capacitance
RL = Load resistance.
S1 = Test selection switch
Test circuit for measuring switching times
Table 9. Test data
Type
Input
VI
tr, tf
74HC4520
GND to VCC
6 ns
74HCT4520
GND to 3 V
6 ns
Load
CL
15 pF, 50 pF
15 pF, 50 pF
RL
1 k
1 k
S1 position
tPHL, tPLH
open
open
74HC_HCT4520
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 10 May 2016
© Nexperia B.V. 2017. All rights reserved
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