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부품번호 | DM74LS390 기능 |
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기능 | Dual 4-Bit Decade Counter | ||
제조업체 | Fairchild Semiconductor | ||
로고 | |||
전체 6 페이지수
August 1986
Revised March 2000
DM74LS390
Dual 4-Bit Decade Counter
General Description
Each of these monolithic circuits contains eight master-
slave flip-flops and additional gating to implement two indi-
vidual four-bit counters in a single package. The
DM74LS390 incorporates dual divide-by-two and divide-
by-five counters, which can be used to implement cycle
lengths equal to any whole and/or cumulative multiples of 2
and/or 5 up to divide-by-100. When connected as a bi-qui-
nary counter, the separate divide-by-two circuit can be
used to provide symmetry (a square wave) at the final out-
put stage. The DM74LS390 has parallel outputs from each
counter stage so that any submultiple of the input count fre-
quency is available for system-timing signals.
Features
s Dual version of the popular DM74LS90
s DM74LS390...individual clocks for A and B flip-flops
provide dual ÷ 2 and ÷ 5 counters
s Direct clear for each 4-bit counter
s Dual 4-bit version can significantly improve system den-
sities by reducing counter package count by 50%
s Typical maximum count frequency...35 MHz
s Buffered outputs reduce possibility of collector commu-
tation
Ordering Code:
Order Number Package Number
Package Description
DM74LS390M
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74LS390N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
© 2000 Fairchild Semiconductor Corporation DS006433
www.fairchildsemi.com
Switching Characteristics
at VCC = 5V and TA = 25°C
Symbol
Parameter
fMAX
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPHL
Maximum Clock
Frequency
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
LOW-to-HIGH Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
Propagation Delay Time
HIGH-to-LOW Level Output
From (Input)
To (Output)
A to QA
B to QB
A to QA
A to QA
A to QC
A to QC
B to QB
B to QB
B to QC
B to QC
B to QD
B to QD
Clear to Any Q
RL = 2 kΩ
CL = 15 pF
CL = 50 pF
Min Max Min Max
25 20
20 15
20 24
20 30
60 81
60 81
21 27
21 33
39 51
39 54
21 27
21 33
39 45
Units
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
www.fairchildsemi.com
4
4페이지 | |||
구 성 | 총 6 페이지수 | ||
다운로드 | [ DM74LS390.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
DM74LS390 | Dual 4-Bit Decade Counter | Fairchild Semiconductor |
DM74LS393 | Dual 4-Bit Binary Counter | Fairchild Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |