參數(shù)資料
型號: HCF4521BM1
廠商: 意法半導(dǎo)體
英文描述: Octal Buffers/Drivers With 3-State Outputs 20-CFP -55 to 125
中文描述: 24舞臺分頻器
文件頁數(shù): 7/12頁
文件大?。?/td> 102K
代理商: HCF4521BM1
FUNCTIONAL TEST SEQUENCE
Inputs
Outputs
V
DD
Comments
RESET
In2
Out2
V
SS
Q18 thru
Q24
0
1
0
0
V
DD
GND
Counter is in three 8-stage sections in parallel mode.
Counter is reset. In2 and Out2 are connected togheter
First ”0” to ”1” transition on In2, Out2 node.
255 ”0” to ”1” transitions are clocked into this In2, Out2
node.
0
0
0
0
0
0
0
0
0
1
0
1
1
0
0
1
1
0
1
0
1
1
0
0
0
0
1
V
DD
V
DD
V
DD
V
DD
V
DD
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
V
DD
V
DD
V
DD
0
0
0
1
1
1
1
1
0
The 255th ”0” to ”1” transition.
Counter converted back to 24-stages in series mode.
Out2 converts back to an output
Counter ripples from an all ”1” state to an all ”0” stage.
Atestfunction(seefig.8)has been included forthereduction oftesttimerequiredtoexerciseall 24counter stages.Thistestfunctiondividesthecounter
intothree8-stagesections and255counts areloaded ineachofthe8-stage sections inparallel.Allflip-floparenow ata logic”1”.Thecounter isnow
returned tothenormal 24-stages inseriesconfiguration. Onemorepulse isenteredintoInput2 (In2)whichwillcause thecountertoripplefromanall”1”
statetoanall”0”state.
RC Oscillator Circuit
Functional Test Circuit
f
1
2.3 R
TC
C
R
S
2R
TC
finHz, RinOhms,C inFarads
HCF4521
7/12
相關(guān)PDF資料
PDF描述
HCF4522BM1 PROGRAMMABLE BCD DIVIDER-BY-N COUNTER
HCF4522B Octal Buffers/Drivers With 3-State Outputs 20-LCCC -55 to 125
HCF4522BC1 Octal Buffers/Drivers With 3-State Outputs 20-CDIP -55 to 125
HCF4522BEY Octal Buffers/Drivers With 3-State Outputs 20-CFP -55 to 125
HCC4522BF Replaced by SN54S74 : Dual D-type Positive-Edge-Triggered Flip-Flops With Preset And Clear 14-CDIP -55 to 125
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