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HCF4076BEY 데이터시트(PDF) 7 Page - STMicroelectronics

부품명 HCF4076BEY
상세설명  BCD RATE MULTIPLEXER
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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DYNAMIC ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test Conditions
Value
Unit
VDD (V)
Min.
Typ.
Max.
tR
Inhibit Input Removal Time
5
240
120
ns
10
130
65
15
110
55
tR
Set Remova Time
5
150
75
ns
10
80
40
15
50
25
tR
Clear Removal Time
5
60
30
ns
10
40
20
15
30
15
APPLICATION NOTE
For fractional multipliers with more than one digit,
HCC/HCF4527B devices may be cascated in two
different modes: the Add mode and the Mltiply mode
(see figures 1 and 2).
When two units are cascated in Add mode and pro-
grammed to 9 and 4 respectively, the more signifi-
cant unit will have 9 output pulses for every 10 input
pulses and the other unit will have 4 output pulses
for every 100 input pulses for a total of:
9
10
+
4
100
=
94
100
In the multiply mode, the fraction programmed into
the first rate multiplier is multiplied by the fraction
programmed into the second one:
If N1 = 9 and N2 =4
fout2 =
4
10
fout1
fout1
=
9
10
fclock
fout2
=
4
10
× 
9
10
fclock
=
36
100
fclock
Therefore 36 output pulses for every 100 clock input
pulses.
HCC/HCF4527B
7/13


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