參數(shù)資料
型號: SN74LS298D
廠商: MOTOROLA INC
元件分類: 通用總線功能
英文描述: QUAD 2-INPUT MULTIPLEXER WITH STORAGE
中文描述: LS SERIES, NEGATIVE EDGE TRIGGERED D FLIP-FLOP, TRUE OUTPUT, PDSO16
封裝: SOIC-16
文件頁數(shù): 2/6頁
文件大小: 187K
代理商: SN74LS298D
5-474
FAST AND LS TTL DATA
SN54/74LS298
LOGIC OR BLOCK DIAGRAM
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
I
h
X
X
I1
X
X
I
h
Q
I
I
L
H
L
H
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
Min
Typ
Max
Unit
VCC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
TA
Operating Ambient Temperature Range
54
74
–55
0
25
25
125
70
°
C
IOH
IOL
Output Current — High
54, 74
–0.4
mA
Output Current — Low
54
74
4.0
8.0
mA
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