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N74F148D PDF даташит

Спецификация N74F148D изготовлена ​​​​«Philips» и имеет функцию, называемую «8-input priority encoder».

Детали детали

Номер произв N74F148D
Описание 8-input priority encoder
Производители Philips
логотип Philips логотип 

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N74F148D Даташит, Описание, Даташиты
INTEGRATED CIRCUITS
74F148
8-input priority encoder
Product specification
IC15 Data Handbook
Philips
Semiconductors
1990 Mar 01









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N74F148D Даташит, Описание, Даташиты
Philips Semiconductors
8-input priority encoder
Product specification
74F148
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
I4 1
I5 2
I6 3
I7 4
EI 5
A2 6
A1 7
GND 8
16 VCC
15 EO
14 GS
13 I3
12 I2
11 I1
10 I0
9 A0
SF00181
TYPE
74F148
TYPICAL
PROPAGATION
DELAY
6.0ns
TYPICAL
SUPPLY CURRENT
(TOTAL)
23mA
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL RANGE
VCC = 5V ±10%,
Tamb = 0°C to +70°C
16-pin plastic DIP
N74F148N
16-pin plastic SO
N74F148D
PKG DWG #
SOT38-4
SOT109-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74F (U.L.) HIGH/LOW
I1 – I7
Priority inputs (active Low)
1.0/2.0
I0 Priority input (active Low)
1.0/1.0
EI Enable input (active Low)
1.0/2.0
EO Enable output (active Low)
50/33
GS Group select output (active Low)
50/33
A0 – A2
Address outputs (active Low)
50/33
NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.
LOAD VALUE HIGH/LOW
20µA/1.2mA
20µA/0.6mA
20µA/1.2mA
1.0mA/20mA
1.0mA/20mA
1.0mA/20mA
March 1, 1990
2 853–0345 98994









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N74F148D Даташит, Описание, Даташиты
Philips Semiconductors
8-input priority encoder
Product specification
74F148
LOGIC SYMBOL
IEC/IEEE SYMBOL
10 11 12 13 1 2 3 4
I0 I1 I2 I3 I4 I5 I6 I7
5 EI
A0 A1 A2
EO 15
GS 14
VCC = Pin 16
GND = Pin 8
9 76
SF00182
10 HPRI/BIN
10/Z10
0α
9
11
11/Z11
7
1α
12 2/Z12
8
2α
13
3/Z13
1
4/Z14
2
5/Z15
10 1
3 11
4
6/Z16
7/Z17
12
13 18
14
15
14
5
EN = α/V18
15
16
α
17
SF00183
LOGIC DIAGRAM
EI I7 I6 I5 I4 I3 I2 I1 I0
5 4 3 2 1 13 12 11 10
VCC = Pin 16
GND = Pin 8
9 9 9 14 15
A2 A1 A0 GS EO
SF00184
March 1, 1990
3










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