SN74LS90N 查看數據表（PDF） - Motorola => Freescale
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SN74LS90N Datasheet PDF : 6 Pages
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SN54/74LS90 • SN54/74LS92 • SN54/74LS93
LS90
MODE SELECTION
RESET / SET INPUTS
MR1 MR2 MS1 MS2
HH LX
HHXL
X X HH
L X LX
X L XL
L XXL
X L LX
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
OUTPUTS
Q0 Q1 Q2 Q3
LL LL
LL LL
HL LH
Count
Count
Count
Count
LS92 AND LS93
MODE SELECTION
RESET
INPUTS
OUTPUTS
MR1 MR2
HH
LH
HL
LL
Q0 Q1 Q2 Q3
LL LL
Count
Count
Count
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
LS90
BCD COUNT SEQUENCE
COUNT
0
1
2
3
4
5
6
7
8
9
OUTPUT
Q0 Q1
LL
HL
LH
HH
LL
HL
LH
HH
LL
HL
Q2 Q3
LL
LL
LL
LL
HL
HL
HL
HL
LH
LH
NOTE: Output Q0 is connected to Input
CP1 for BCD count.
LS92
TRUTH TABLE
COUNT
OUTPUT
Q0 Q1 Q2 Q3
0
LL LL
1
HL LL
2
LH LL
3
HH L L
4
LL HL
5
HL HL
6
LL LH
7
HL LH
8
LH LH
9
HH LH
10
L L HH
11
HL HH
NOTE: Output Q0 is connected to Input
CP1.
LS93
TRUTH TABLE
COUNT
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
OUTPUT
Q0 Q1
LL
HL
LH
HH
LL
HL
LH
HH
LL
HL
LH
HH
LL
HL
LH
HH
Q2 Q3
LL
LL
LL
LL
HL
HL
HL
HL
LH
LH
LH
LH
HH
HH
HH
HH
NOTE: Output Q0 is connected to Input
CP1.
FAST AND LS TTL DATA
5-93
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