SN74LS299 查看數據表（PDF） - Motorola => Freescale
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SN74LS299 Datasheet PDF : 7 Pages
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S1 19 S0 1
SN54 / 74LS299
LOGIC DIAGRAM
DS0
11
18
DS7
12
CLOCK
8
Q0
MR
9
2
OE1
OE2
3
D CK
CLR
Q
D CK
CLR
Q
D CK
CLR
Q
7
I/O0
13
I/O1
6
I/O2
D CK
CLR
Q
14
I/O3
D CK
CLR
Q
5
I/O4
D CK
CLR
Q
15
I/O5
D CK
CLR
Q
4
I/O6
D CK
CLR
Q
17
Q7
16
I/O7
VCC = PIN 20
GND = PIN 10
= PIN NUMBERS
INPUTS
MR S1 S0 OE1 OE2
L XX H X
L XX X H
L HH X X
L
LX
L
L
L
XL
L
L
H LH X X
H
LH
L
L
H HL X X
H
HL
L
L
H HH X X
H LL HX
H LL XH
H
LL
L
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
FUNCTION TABLE
RESPONSE
CP DS0 DS7
X
X
X
X
X
X
Asynchronous Reset; Q0 = Q7 = LOW
I/O Voltage Undetermined
XXX
X X X Asynchronous Reset; Q0 = Q7 = LOW
X X X I/O Voltage LOW
D X Shift Right; D Q0; Q0 Q1; etc.
D X Shift Right; D Q0 & I/O0; Q0 O1 & I/O1; etc.
X D Shift Left; D Q7; Q7 Q6; etc.
X D Shift Left; D Q7 & I/O7; Q7 Q6 & I/O6; etc.
X X Parallel Load; I/On Qn
X
X
X Hold: I/O Voltage undetermined
XXX
X X X Hold: I/On = Qn
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA
Operating Ambient Temperature Range
IOH
Output Current — High
Q0, Q7
IOL
Output Current — Low
Q0, Q7
Q0, Q7
IOH
Output Current — High
I/O0 – I/O7
I/O0 – I/O7
IOL
Output Current — Low
I/O0 – I/O7
I/O0 – I/O7
Min
Typ
Max
Unit
54
4.5
5.0
5.5
V
74
4.75
5.0
5.25
54
– 55
25
125
°C
74
0
25
70
54, 74
– 0.4
mA
54
4.0
mA
74
8.0
54
– 1.0
mA
74
– 2.6
54
12
mA
74
24
FAST AND LS TTL DATA
5-480
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