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SN74LS390 Datasheet(PDF) 1 Page - Motorola, Inc

No. de pieza SN74LS390
Descripción Electrónicos  DUAL DECADE COUNTER; DUAL 4-STAGE BINARY COUNTER
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Fabricante Electrónico  MOTOROLA [Motorola, Inc]
Página de inicio  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

SN74LS390 Datasheet(HTML) 1 Page - Motorola, Inc

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FAST AND LS TTL DATA
DUAL DECADE COUNTER;
DUAL 4-STAGE
BINARY COUNTER
The SN54 / 74LS390 and SN54 / 74LS393 each contain a pair of high-speed
4-stage ripple counters. Each half of the LS390 is partitioned into a
divide-by-two section and a divide-by five section, with a separate clock input
for each section. The two sections can be connected to count in the 8.4.2.1
BCD code or they can count in a biquinary sequence to provide a square wave
(50% duty cycle) at the final output.
Each half of the LS393 operates as a Modulo-16 binary divider, with the last
three stages triggered in a ripple fashion. In both the LS390 and the LS393,
the flip-flops are triggered by a HIGH-to-LOW transition of their CP inputs.
Each half of each circuit type has a Master Reset input which responds to a
HIGH signal by forcing all four outputs to the LOW state.
Dual Versions of LS290 and LS293
LS390 has Separate Clocks Allowing ÷2, ÷2.5, ÷5
Individual Asynchronous Clear for Each Counter
Typical Max Count Frequency of 50 MHz
Input Clamp Diodes Minimize High Speed Termination Effects
CONNECTION DIAGRAM DIP (TOP VIEW)
SN54 / 74LS390
SN54 / 74LS393
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
14
13
12
11
10
9
1
2
3
4
5
6
8
7
VCC CP
MR
Q0 Q1
Q2
Q3
CP
MR
Q0
Q1
Q2
Q3 GND
14
13
12
11
10
9
1
2
3
4
5
6
7
16
15
8
VCC
CP0
CP0 MR
Q0 CP1
Q2
Q1
Q3
MR
Q0 CP1 Q1
Q2
Q3 GND
SN54/74LS390
SN54/74LS393
LOW POWER SCHOTTKY
ORDERING INFORMATION
SN54LSXXXJ
Ceramic
SN74LSXXXN
Plastic
SN74LSXXXD
SOIC
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16
1
16
1
16
1
D SUFFIX
SOIC
CASE 751B-03
DUAL DECADE COUNTER;
DUAL 4-STAGE
BINARY COUNTER
J SUFFIX
CERAMIC
CASE 632-08
N SUFFIX
PLASTIC
CASE 646-06
14
1
14
1
14
1
D SUFFIX
SOIC
CASE 751A-02


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