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參數(shù)資料
| 型號： | 933794690602 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 算術(shù)邏輯單元 |
| 英文描述： | F/FAST SERIES, 8-BIT ENCODER, PDIP16 |
| 封裝： | 0.300 INCH, PLASTIC, SOT-38-4, DIP-16 |
| 文件頁數(shù)： | 3/10頁 |
| 文件大?。?/td> | 95K |
| 代理商： | 933794690602 |
Philips Semiconductors
Product specification
74F148
8-input priority encoder
2
March 1, 1990
853–0345 98994
FEATURES
Code conversions
Multi-channel D/A converter
Decimal-to-BCD converter
Cascading for priority encoding of “N” bits
Input enable capability
Priority encoding-automatic selection of highest priority input line
Output enable-active Low when all inputs are High
Group signal output-active when any input is Low
DESCRIPTION
The 74F148 8-input priority encoder accepts data from eight
active-Low inputs and provides a binary representation 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 I7 having
the highest priority. A High on the Enable Input (EI) 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 (GS) output and an Enable Output (EO) are provided with the
three data outputs. The GS is active-Low when any input is Low:
this indicates when any input is active. The EO is active-Low when
all inputs are High. Using the Enable Output along with the Enable
Input allows priority encoding of N input signals. Both EO and GS
are active-High when the Enable Input is High.
PIN CONFIGURATION
16
15
14
13
12
11
10
7
6
5
4
3
2
1
A1
VCC
I2
I1
I0
I3
EO
GS
I4
I5
A2
I6
I7
EI
9
8
GND
A0
SF00181
TYPE
TYPICAL
PROPAGATION
DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74F148
6.0ns
23mA
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL RANGE
VCC = 5V ±10%,
Tamb = 0°C to +70°C
PKG DWG #
16-pin plastic DIP
N74F148N
SOT38-4
16-pin plastic SO
N74F148D
SOT109-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74F (U.L.) HIGH/LOW
LOAD VALUE HIGH/LOW
I1 – I7
Priority inputs (active Low)
1.0/2.0
20
A/1.2mA
I0
Priority input (active Low)
1.0/1.0
20
A/0.6mA
EI
Enable input (active Low)
1.0/2.0
20
A/1.2mA
EO
Enable output (active Low)
50/33
1.0mA/20mA
GS
Group select output (active Low)
50/33
1.0mA/20mA
A0 – A2
Address outputs (active Low)
50/33
1.0mA/20mA
NOTE: One (1.0) FAST unit load is defined as: 20
A in the High state and 0.6mA in the Low state.
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