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74LS390 PDF даташит

Спецификация 74LS390 изготовлена ​​​​«Fairchild Semiconductor» и имеет функцию, называемую «Dual 4-Bit Decade Counter».

Детали детали

Номер произв 74LS390
Описание Dual 4-Bit Decade Counter
Производители Fairchild Semiconductor
логотип Fairchild Semiconductor логотип 

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74LS390 Даташит, Описание, Даташиты
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









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74LS390 Даташит, Описание, Даташиты
Function Tables
BCD Count Sequence
(Each Counter) (Note 1)
Count
0
1
2
3
4
5
6
7
8
9
QD
L
L
L
L
L
L
L
L
H
H
Outputs
QC QB
LL
LL
LH
LH
HL
HL
HH
HH
LL
LL
QA
L
H
L
H
L
H
L
H
L
H
H = HIGH Level
L = LOW Level
Note 1: Output QA is connected to input B for BCD count.
Note 2: Output QD is connected to input A for Bi-quinary count.
Logic Diagram
Bi-Quinary (5-2)
(Each Counter) (Note 2)
Count
0
1
2
3
4
5
6
7
8
9
QA
L
L
L
L
L
H
H
H
H
H
Outputs
QD QC
LL
LL
LH
LH
HL
LL
LL
LH
LH
HL
QB
L
H
L
H
L
L
H
L
H
L
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74LS390 Даташит, Описание, Даташиты
Absolute Maximum Ratings(Note 3)
Supply Voltage
7V
Input Voltage
Clear
7V
A or B
5.5V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range
65°C to +150°C
Note 3: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Recommended Operating Conditions
Symbol
Parameter
Min
VCC Supply Voltage
4.75
VIH HIGH Level Input Voltage
2
VIL LOW Level Input Voltage
IOH HIGH Level Output Current
IOL LOW Level Output Current
fCLK
Clock Frequency (Note 4) A to QA
0
B to QB
0
fCLK
Clock Frequency (Note 5) A to QA
0
B to QB
0
tW
Pulse Width (Note 4)
A
20
B 25
Clear HIGH
20
tREL Clear Release Time (Note 6)(Note 7) 25
TA Free Air Operating Temperature
0
Note 4: CL = 15 pF, RL = 2 k, TA = 25°C and VCC = 5V.
Note 5: CL = 50 pF, RL = 2 k, TA = 25°C and VCC = 5V.
Note 6: The symbol () indicates the falling edge of the clear pulse is used for reference.
Note 7: TA = 25°C and VCC = 5V.
Nom
5
Max
5.25
0.8
0.4
8
25
20
20
15
70
Units
V
V
V
mA
mA
MHz
MHz
ns
ns
°C
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Typ
Min Max
(Note 8)
Units
VI Input Clamp Voltage
VOH HIGH Level
Output Voltage
VOL LOW Level
Output Voltage
II Input Current @ Max
Input Voltage
IIH HIGH Level
Input Current
VCC = Min, II = −18 mA
VCC = Min, IOH = Max
VIL = Max, VIH = Min
VCC = Min, IOL = Max
VIL = Max, VIH = Min
IOL = 4 mA, VCC = Min
VCC = Max, VI = 7V
VCC = Max
VI = 5.5V
VCC = Max
VI = 2.7V
Clear
A
B
Clear
A
B
1.5 V
2.7 3.4
V
0.35
0.25
0.5
0.4
0.1
0.2
0.4
20
40
80
V
mA
µA
IIL LOW Level
Input Current
VCC = Max, VI = 0.4V
Clear
A
0.4
1.6 mA
B 2.4
IOS Short Circuit Output Current
ICC Supply Current
Note 8: All typicals are at VCC = 5V, TA = 25°C.
VCC = Max (Note 9)
VCC = Max (Note 10)
20
100
mA
15 26 mA
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 CLEAR inputs grounded following momentary connection to 4.5 and all other inputs grounded.
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