Data Sheet

5-1
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
123456
8
7
V
CC
CP
MR Q
0
Q
1
Q
2
Q
3
CP
MR Q
0
Q
1
Q
2
Q
3
GND
14 13 12 11 10 9
123456
7
16 15
8
V
CC
CP
0
CP
0
MR Q
0
CP
1
Q
2
Q
1
Q
3
MR Q
0
CP
1
Q
1
Q
2
Q
3
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