74HC699 Просмотр технического описания (PDF) - STMicroelectronics
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производитель
74HC699
HC697/699 U/D 4 BIT BINARY COUNTER/REGISTER (3-STATE) , HC696/698 U/D DECADE COUNTER/REGISTER (3-STA
STMicroelectronics
74HC699 Datasheet PDF : 22 Pages
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M54/M74HC696/697/698/699
TRUTH TABLE
INPUTS
OUTPUTS
CCLR LOAD ENP ENT CCK U/D RCK R/C G QA QB QC QD
X
X
X
X
X
X
X
XHZ
Z
Z
Z
L
X
X
X X (*) X
X
LLL
L
L
L
H
L
X
X
H
H
H
X
X
X
LLa
b
c
d
X
X
LL
NO CHANGE
H
H
X
H
X
X
LL
NO CHANGE
H
H
L
L
H
X
LL
COUNT UP
H
H
L
L
L
X
LL
COUNT DOWN
H
X
X
X
X
X
LL
NO CHANGE
X
X
X
X
X
X
H L a’
b’
c’
d’
X
(*)
X
Z
a-d
a’-d’
X
X
X
X
X
HL
NO CHANGE
:
For HC698/699
: Don’t care
: High impedance
: The level of steady state input at inputs a through D respectively
: The level of steady state outputs at internal counter outputs QA’ through QD’ respectively
RCO function : HC696/8 - RCO = (UP • QA • QD • ENT + UP • QA • QD • ENT)
HC697/9 - RCO = (UP • QA • QB • QC • QD • ENT + UP • QA • QB • QC • QD • ENT)
FUNCTION
HIGH IMPEDANCE
CLEAR COUNTER
LOAD COUNTER
NO COUNT
NO COUNT
COUNT UP
COUNT DOWN
NO COUNT
LOAD REGISTER
NO LOAD
BLOCK DIAGRAM
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