SN54-74LS90 ON Semiconductor, SN54-74LS90 Datasheet - Page 4

• Manufacturer Part Number: SN54-74LS90
• Description: DECADE COUNTER; DIVIDE-BY-TWELVE COUNTER; 4-BIT BINARY COUNTER
• Manufacturer: ON Semiconductor

NOTE: Output Q 0 is connected to Input
CP 1 for BCD count.
COUNT
BCD COUNT SEQUENCE
0
1
2
3
4
5
6
7
8
9
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
MR 1 MR 2 MS 1 MS 2
RESET / SET INPUTS
H
H
X
X
X
L
L
LS90
Q 0
H
H
H
H
H
L
L
L
L
L
SN54/74LS90 SN54/74LS92 SN54/74LS93
OUTPUT
H
H
X
X
L
X
L
Q 1
H
H
H
H
L
L
L
L
L
L
MODE SELECTION
X
H
X
X
Q 2
L
L
L
H
H
H
H
L
L
L
L
L
L
Q 3
H
H
H
L
L
L
L
L
L
L
L
X
L
X
L
L
X
LS90
Q 0
H
L
L
NOTE: Output Q 0 is connected to Input
CP 1 .
OUTPUTS
COUNT
FAST AND LS TTL DATA
Q 1
L
L
L
Count
Count
Count
Count
10
11
0
1
2
3
4
5
6
7
8
9
Q 2
L
L
L
TRUTH TABLE
Q 3
H
L
L
LS92
Q 0
5-4
H
H
H
H
H
H
L
L
L
L
L
L
OUTPUT
Q 1
H
H
H
H
L
L
L
L
L
L
L
L
Q 2
H
H
H
H
L
L
L
L
L
L
L
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Q 3
MR 1 MR 2
H
H
H
H
H
H
L
L
L
L
L
L
INPUTS
H
H
RESET
L
L
MODE SELECTION
LS92 AND LS93
H
H
L
L
NOTE: Output Q 0 is connected to Input
CP 1 .
COUNT
Q 0
10
12
13
14
15
L
11
0
1
2
3
4
5
6
7
8
9
OUTPUTS
TRUTH TABLE
Q 1
L
Count
Count
Count
LS93
Q 0
Q 2
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
OUTPUT
Q 1
Q 3
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
Q 2
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L
Q 3
H
H
H
H
H
H
H
H
L
L
L
L
L
L
L
L