74LS298 ON Semiconductor, 74LS298 Datasheet - Page 3

• Manufacturer Part Number: 74LS298
• Description: LOW POWER SCHOTTKY
• Manufacturer: ON Semiconductor

FUNCTIONAL DESCRIPTION
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
The LS298 is a high speed Quad 2-Port Register. It selects
V
GND = PIN 8
CC
= PIN NUMBERS
= PIN 16
CP
S
10
11
I
1a
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.
2
S
h
h
I
I
I
0a
3
R
CP
S Q
LOGIC OR BLOCK DIAGRAM
I
1b
a
15
INPUTS
1
Q
a
http://onsemi.com
I
X
X
h
0
I
TRUTH TABLE
SN74LS298
I
0b
4
R
CP
S Q
3
b
14
I
1c
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.
Q
I
X
X
h
5
1
I
b
I
0c
9
R
CP
S Q
OUTPUT
c
13
I
1d
Q
H
H
L
L
Q
6
c
I
0d
7
R
CP
S Q
d
12
Q
d