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.
SN54/74LS390
SN54/74LS393
DUAL DECADE COUNTER;
DUAL 4-STAGE
BINARY COUNTER
LOW POWER SCHOTTKY
•
•
•
•
•
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
J SUFFIX
CERAMIC
CASE 620-09
16
1
16
1
N SUFFIX
PLASTIC
CASE 648-08
CONNECTION DIAGRAM DIP
(TOP VIEW)
SN54 / 74LS390
VCC
16
CP0
15
MR
14
Q0
13
CP1
12
Q1
11
Q2
10
Q3
9
J SUFFIX
CERAMIC
CASE 632-08
14
1
16
1
D SUFFIX
SOIC
CASE 751B-03
1
CP0
2
MR
3
Q0
4
CP1
5
Q1
6
Q2
7
Q3
8
GND
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
14
1
N SUFFIX
PLASTIC
CASE 646-06
SN54 / 74LS393
VCC
14
CP
13
MR
12
Q0
11
Q1
10
Q2
9
Q3
8
14
1
D SUFFIX
SOIC
CASE 751A-02
ORDERING INFORMATION
1
CP
2
MR
3
Q0
4
Q1
5
Q2
6
Q3
7
GND
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
Ceramic
Plastic
SOIC
FAST AND LS TTL DATA
5-1
ONSEMI [ ON SEMICONDUCTOR ]
