參數(shù)資料
型號(hào): M74HC698RM13TR
廠商: STMICROELECTRONICS
元件分類: 計(jì)數(shù)器
英文描述: HC/UH SERIES, SYN POSITIVE EDGE TRIGGERED 4-BIT BIDIRECTIONAL DECADE COUNTER, PDSO20
封裝: SO-20
文件頁(yè)數(shù): 9/16頁(yè)
文件大?。?/td> 1488K
代理商: M74HC698RM13TR
M74HC698
2/16
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
TRUTH TABLE
X : Don’t Care
Z : High Impedance
a-d : The level of steady state inputs at inputs A through D respectively.
a’-d’ : The level of steady state outputs at internal counter outputs QA’ through QD’ respectively
RCO = (UP QA QD ENT + UP QA QD ENT)
PIN No
SYMBOL
NAME AND FUNCTION
1U/D
Up Down Counter
Selector
2
CCK
Counter Clock
3, 4, 5, 6
A to D
Data Inputs
7, 14
ENP/ENT
Enable P and T
8
CCLR
Counter Clear (Active
LOW)
9
RCK
Register Clock
11
R/C
Counter/Register Select
12
G
Enable Input
13
LOAD
Load Counter (Active
LOW)
15 to 18
QA to QD
Data Outputs
19
RCO
Load Counter (Active
High)
10
GND
Ground (0V)
20
VCC
Positive Supply Voltage
INPUTS
OUTPUTS
FUNCTION
CCLR LOAD
ENP
ENT
CCK
U/D
RCK
R/C
G
QA QB
QC
QD
XXXX
H
Z
HIGH IMPEDANCE
L
X
L
CLEAR COUNTER
H
L
X
L
a
b
c
d
LOAD COUNTER
H
X
L
NO CHANGE
NO COUNT
H
X
H
X
L
NO CHANGE
NO COUNT
H
L
H
X
L
COUNT UP
H
L
X
L
COUNT DOWN
H
X
L
NO CHANGE
NO COUNT
XXXX
XX
H
L
a’
b’
c’
d’
LOAD REGISTER
XXXX
XX
H
L
NO CHANGE
NO LOAD
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