SN74LS298 データシートの表示（PDF） - Motorola => Freescale
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SN74LS298 Datasheet PDF : 6 Pages
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SN54 / 74LS298
LOGIC OR BLOCK DIAGRAM
I1a
I0a
I1b
I0b
2
3
1
4
S
10
I1c
5
I0c
9
I1d
6
I0d
7
CP
11
VCC = PIN 16
GND = PIN 8
= PIN NUMBERS
R
CP
S Qa
15
Qa
R
CP
S Qb
14
Qb
R
CP
S Qc
13
Qc
R
CP
S Qd
12
Qd
FUNCTIONAL DESCRIPTION
The LS298 is a high speed Quad 2-Port Register. It selects
four bits of data from two sources (ports)under the control of a
Common Select Input (S). The selected data is transferred to
the 4-bit output register synchronous with the HIGH to LOW
transition of the Clock input (CP). The 4-bit output register is
fully edge-triggered. The Data inputs (I) and Select input (S)
must be stable only one setup time prior to the HIGH to LOW
transition of the clock for predictable operation.
TRUTH TABLE
INPUTS
OUTPUT
S
I0
I1
Q
I
I
X
L
I
h
X
H
h
X
I
L
h
X
h
H
L = LOW Voltage Level
H = HIGH Voltage Level
X = Don’t Care
I = LOW Voltage Level one setup time prior to the HIGH to LOW clock transition.
h = HIGH Voltage Level one setup time prior to the HIGH to LOW clock transition.
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA
Operating Ambient Temperature Range
IOH
Output Current — High
IOL
Output Current — Low
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
FAST AND LS TTL DATA
5-474
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