HCF4527B データシートの表示（PDF） - STMicroelectronics

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HCF4527B

BCD RATE MULTIPLEXER

STMicroelectronics 

HCF4527B

Symbol

Parameter

VDD (V)

tR Inhibit Input Removal Time

5

10

15

tR Set Removal Time

5

10

15

tR Clear Removal Time

5

10

15

(*) Typical temperature coefficient for all VDD value is 0.3 %/°C.

Test Condition

Value (*)

Unit

Min. Typ. Max.

240 120

130 65

ns

110 55

150 75

80 40

ns

50 25

60 30

40 20

ns

30 15

APPLICATION NOTE :

For fractional multipliers with more than one digit,

HCF4527B may be cascaded in two different

modes: The ADD mode and the MULTIPLY mode

(see figure 1 and 2).

When two units are cascaded in ADD mode and

programmed to 9 and 4 respectively, the more

significant unit will have 9 output pulses for every

10 input pulses and the other will have 4 output

pulses for every 100 input pulses for a total of :

 190 + 1040 = 19040

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 = 140 fOUT1

fOUT1 = 190 fCLOCK

fOUT2 = 140 x ( 190 fCLOCK ) = 13060 fCLOCK

Therefore 36 output pulses for every 100 clock

input pulses

Two HCF4527B Cascaded in the ADD mode with a Preset Number

8/12

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