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HCF4521 Datasheet(PDF) 7 Page - STMicroelectronics

No. de pieza HCF4521
Descripción Electrónicos  24 STAGE FREQUENCY DIVIDER
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

HCF4521 Datasheet(HTML) 7 Page - STMicroelectronics

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FUNCTIONAL TEST SEQUENCE
I npu ts
Outpu ts
Co mmen ts
RESET
In2
Out2
VSS’VDD’Q18 thru
Q24
100
VDD
GND
0
Counter is in three 8-stage sections in parallel mode.
Counter is reset. In2 and Out2 are connected togheter
011
VDD
GND
0
First ”0” to ”1” transition on In2, Out2 node.
000
VDD
GND
0
255 ”0” to ”1” transitions are clocked into this In2, Out2
node.
011
VDD
GND
0
011
VDD
GND
1
The 255th ”0” to ”1” transition.
000
VDD
GND
1
000
GND
GND
1
010
GND
VDD
1
Counter converted back to 24-stages in series mode.
010
GND
VDD
1
Out2 converts back to an output
001
GND
VDD
0
Counter ripples from an all ”1” state to an all ”0” stage.
A test function (see fig.8) has been included forthe reduction oftest time required to exercise all 24 counter stages. This test function divides the counter
intothree 8-stage sections and 255 counts are loaded in each of the 8-stage sections in parallel. All flip-flopare now ata logic ”1”. The counter is now
returned to the normal 24-stages in series configuration. One more pulse is entered intoInput 2 (In2) which will cause the counter to ripple from an all ”1”
state to an all ”0” state.
RC Oscillator Circuit
Functional Test Circuit
f
1
2.3
RTC C
RS
≥ 2RTC
f in Hz, R in Ohms, C in Farads
HCF4521
7/12


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