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DM74LS90 데이터시트 PDF




National에서 제조한 전자 부품 DM74LS90은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 DM74LS90 기능
기능 Decade and Binary Counters
제조업체 National
로고 National 로고


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DM74LS90 데이터시트, 핀배열, 회로
August 1986
Revised March 2000
DM74LS90
Decade and Binary Counters
General Description
Each of these monolithic counters contains four master-
slave flip-flops and additional gating to provide a divide-by-
two counter and a three-stage binary counter for which the
count cycle length is divide-by-five for the DM74LS90.
All of these counters have a gated zero reset and the
DM74LS90 also has gated set-to-nine inputs for use in
BCD nine’s complement applications.
To use their maximum count length (decade or four bit
binary), the B input is connected to the QA output. The
input count pulses are applied to input A and the outputs
are as described in the appropriate truth table. A symmetri-
cal divide-by-ten count can be obtained from the
DM74LS90 counters by connecting the QD output to the A
input and applying the input count to the B input which
gives a divide-by-ten square wave at output QA.
Features
s Typical power dissipation 45 mW
s Count frequency 42 MHz
Ordering Code:
Order Number Package Number
Package Description
DM74LS90M
M14A
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
DM74LS90N
N14A
14-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
Reset/Count Truth Table
R0(1)
H
H
X
X
L
L
X
Reset Inputs
R0(2) R9(1)
HL
HX
XH
LX
XL
XX
LL
R9(2)
X
L
H
L
X
L
X
Output
QD QC QB QA
LLLL
LLLL
HL LH
COUNT
COUNT
COUNT
COUNT
© 2000 Fairchild Semiconductor Corporation DS006381
www.fairchildsemi.com




DM74LS90 pdf, 반도체, 판매, 대치품
Electrical Characteristics (Continued)
Note 8: QA outputs are tested at IOL = Max plus the limit value of IIL for the B input. This permits driving the B input while maintaining full fan-out capability.
Note 9: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 10: ICC is measured with all outputs open, both RO inputs grounded following momentary connection to 4.5V and all other inputs grounded.
Switching Characteristics at VCC = 5V and TA = 25°C
Symbol
Parameter
fMAX
tPLH
tPHL
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
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 QD
A to QD
B to QB
B to QB
B to QC
B to QC
B to QD
B to QD
SET-9 to QA, QD
SET-9 to QB, QC
SET-0 to Any Q
RL = 2 k
CL = 15 pF
CL = 50 pF
Min Max Min Max
32 20
16 10
16 20
18 24
48 52
50 60
16 23
21 30
32 37
35 44
32 36
35 44
30 35
40 48
40 52
Units
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
www.fairchildsemi.com
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관련 데이터시트

부품번호상세설명 및 기능제조사
DM74LS90

Decade and Binary Counters

National
National
DM74LS90

Decade and Binary Counters

Fairchild Semiconductor
Fairchild Semiconductor

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