參數(shù)資料
型號(hào): MC74HC390DR2
廠商: ON SEMICONDUCTOR
元件分類: 計(jì)數(shù)器
英文描述: HC/UH SERIES, ASYN NEGATIVE EDGE TRIGGERED 3-BIT UP DECADE COUNTER, PDSO16
封裝: PLASTIC, SOIC-16
文件頁(yè)數(shù): 6/9頁(yè)
文件大?。?/td> 223K
代理商: MC74HC390DR2
MC74HC390
http://onsemi.com
6
APPLICATIONS INFORMATION
Each half of the MC54/74HC390 has independent ÷ 2
and ÷ 5 sections (except for the Reset function). The ÷ 2
and ÷ 5 counters can be connected to give BCD or
biquinary (25) count sequences. If Output QA is
connected to the Clock B input (Figure 4), a decade divider
with BCD output is obtained. The function table for the BCD
count sequence is given in Table 1.
To obtain a biquinary count sequence, the input signals
connected to the Clock B input, and output QD is connected
to the Clock A input (Figure 5). QA provides a 50% duty
cycle output. The biquinary count sequence function table
is given in Table 2.
1. BCD Count Sequence*
Count
Output
QD
QC
QB
QA
0
L
1
L
H
2
L
H
L
3
L
H
4
L
H
L
5
L
H
L
H
6
L
H
L
7
L
H
8
H
L
9
H
L
H
*QA connected to Clock B input.
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MC74HC393ADTR2 HC/UH SERIES, ASYN NEGATIVE EDGE TRIGGERED 4-BIT UP BINARY COUNTER, PDSO14
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