HCC4527B STMICROELECTRONICS [STMicroelectronics], HCC4527B Datasheet - Page 7

• Manufacturer Part Number: HCC4527B
• Description: BCD RATE MULTIPLEXER
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

DYNAMIC ELECTRICAL CHARACTERISTICS (continued)
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:
10
9
Symbol
t
t
t
R
R
R
100
4
Inhibit Input Removal Time
Set Remova Time
Clear Removal Time
100
94
Parameter
In the multiply mode, the fraction programmed into
the first rate multiplier is multiplied by the fraction
programmed into the second one:
If N
f
f
f
Therefore 36 output pulses for every 100 clock input
pulses.
out 2
out 1
out 2
Test Conditions
1
= 9 and N
10
10
10
4
9
4
f
f
out 1
clock
10
V
9
DD
2
10
15
10
15
10
15
5
5
5
f
= 4
clock
(V)
Min.
240
130
110
150
80
50
60
40
30
100
36
Value
f
Typ.
clock
HCC/HCF4527B
120
65
55
75
40
25
30
20
15
Max.
Unit
ns
ns
ns
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