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參數(shù)資料
| 型號： | MC74F148N |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | 8-LINE TO 3-LINE PRIORITY ENCODER FAST SHOTTKY TTL |
| 中文描述： | F/FAST SERIES, 8-BIT ENCODER, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 2/3頁 |
| 文件大?。?/td> | 87K |
| 代理商： | MC74F148N |
4-60
FAST AND LS TTL DATA
MC54/74F148
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
VCC
Supply Voltage
54, 74
4.5
5.0
5.5
V
TA
Operating Ambient Temperature Range
54
–55
25
125
°
C
74
0
25
70
IOH
Output Current — High
54, 74
–1.0
mA
IOL
Output Current — Low
54, 74
20
mA
FUNCTIONAL DESCRIPTION
The F148 8-input priority encoder accepts data from eight
active LOW inputs (I0–I7) and provides a binary representa-
tion on the three active LOW outputs. A priority is assigned to
each input so that when two or more inputs are simultaneously
active, the input with the highest priority is represented on the
output, with input line 7 having the highest priority. A HIGH on
the Enable Input (E1) will force all outputs to the inactive
(HIGH) state and allow new data to settle without producing
erroneous information at the outputs. A Group Signal output
(GS) and Enable Output (EO) are provided along with the
three priority data outputs (A2, A1, A0). GS is active LOW when
any input is LOW; this indicates when any input is active. EO
is active LOW when all inputs are HIGH. Using the Enable
Output along with the Enable Input allows cascading for prior-
ity encoding on any number of input signals. Both EO and GS
are in the inactive HIGH state when the Enable Input is HIGH.
FUNCTION TABLE
Inputs
Outputs
E1
I0
I1
I2
I3
I4
I5
I6
I7
GS
A0
A1
A2
EO
H
L
L
L
L
X
H
X
X
X
X
H
X
X
X
X
H
X
X
X
X
H
X
X
X
X
H
X
X
X
X
H
X
X
L
X
H
X
L
H
X
H
L
H
H
H
H
L
L
L
H
H
L
H
L
H
H
L
L
H
H
H
L
L
L
H
L
H
H
H
L
L
L
L
L
X
X
X
X
L
X
X
X
L
H
X
X
L
H
H
X
L
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
H
L
H
L
H
H
L
L
H
H
L
H
H
H
H
H
H
H
H
H
H = HIGH Voltage Level; L = LOW Voltage Level; X = Don’t Care
0
1
2
3
4
5
6
7
E1
A2
A1
A0
GS
’F148
ENABLE
MSB
LSB
FLAG
A3
A2
A1
A0
0
1
2
3
4
5
6
7
E1
A2
A1
A0
GS
’F148
Figure 1. Application: 16-Input Priority Encoder
EO
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