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Электронный компонент: N74F148D

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Philips
Semiconductors
74F148
8-input priority encoder
Product specification
IC15 Data Handbook
1990 Mar 01
INTEGRATED CIRCUITS
Philips Semiconductors
Product specification
74F148
8-input priority encoder
2
March 1, 1990
8530345 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
V
CC
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
V
CC
= 5V
10%,
T
amb
= 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.
Philips Semiconductors
Product specification
74F148
8-input priority encoder
March 1, 1990
3
LOGIC SYMBOL
A0
A1
A2
9
7
6
V
CC
= Pin 16
GND = Pin 8
SF00182
I0
I1
I2
I4
I5
I6
I7
I3
10
11
12
13
1
2
3
4
EO
GS
15
14
5
EI
IEC/IEEE SYMBOL
10
11
12
13
2
3
4
5
10/Z10
5/Z15
11/Z11
6/Z16
3/Z13
2/Z12
7/Z17
EN =
/V18
SF00183
1
4/Z14
HPRI/BIN
0
1
2
18
1
10
11
12
13
16
17
14
15
9
7
8
15
14
LOGIC DIAGRAM
A2
9
V
CC
= Pin 16
GND = Pin 8
SF00184
A1
9
A0
9
GS
14
EO
15
EI
5
I7
4
3
2
1
13
12
11
10
I6
I5
I4
I3
I2
I1
I0
Philips Semiconductors
Product specification
74F148
8-input priority encoder
March 1, 1990
4
FUNCTION TABLE
INPUTS
OUTPUTS
EI
I0
I1
I2
I3
I4
I5
I6
I7
GS
A0
A1
A2
EO
H
X
X
X
X
X
X
X
X
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
L
L
X
X
X
X
X
X
X
L
L
L
L
L
H
L
X
X
X
X
X
X
L
H
L
H
L
L
H
L
X
X
X
X
X
L
H
H
L
L
H
L
H
L
X
X
X
X
L
H
H
H
L
H
H
L
H
L
X
X
X
L
H
H
H
H
L
L
L
H
H
L
X
X
L
H
H
H
H
H
L
H
L
H
H
L
X
L
H
H
H
H
H
H
L
L
H
H
H
L
L
H
H
H
H
H
H
H
L
H
H
H
H
H = High voltage level
L = Low voltage level
X = Don't care
APPLICATION
SF00185
16-Input Priority Encoder
A0
A1
A2
I0
I1
I2
I4
I5
I6
I7
I3
EI
GS
EO
LSB
A0
A1
A2
I0
I1
I2
I4
I5
I6
I7
I3
EI
GS
EO
ENABLE
MSB
A0
A1
A2
A3
FLAG
Philips Semiconductors
Product specification
74F148
8-input priority encoder
March 1, 1990
5
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limits set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free-air temperature range.)
SYMBOL
PARAMETER
RATING
UNIT
V
CC
Supply voltage
0.5 to +7.0
V
V
IN
Input voltage
0.5 to +7.0
V
I
IN
Input current
30 to +5
mA
V
OUT
Voltage applied to output in High output state
0.5 to V
CC
V
I
OUT
Current applied to output in Low output state
40
mA
T
amb
Operating free-air temperature range
0 to +70
C
T
stg
Storage temperature range
65 to +150
C
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
LIMITS
UNIT
SYMBOL
PARAMETER
MIN
NOM
MAX
UNIT
V
CC
Supply voltage
4.5
5.0
5.5
V
V
IH
High-level input voltage
2.0
V
V
IL
Low-level input voltage
0.8
V
I
IK
Input clamp current
18
mA
I
OH
High-level output current
1
mA
I
OL
Low-level output current
20
mA
T
amb
Operating free-air temperature range
0
+70
C
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
SYMBOL
PARAMETER
TEST CONDITIONS
1
LIMITS
UNIT
SYMBOL
PARAMETER
TEST CONDITIONS
1
MIN
TYP
2
MAX
UNIT
V
O
High level output voltage
V
CC
= MIN, V
IL
= MAX
10%V
CC
2.5
V
V
OH
High-level output voltage
V
IH
= MIN, I
OH
= MAX
5%V
CC
2.7
3.4
V
V
O
Low level output voltage
V
CC
= MIN, V
IL
= MAX
10%V
CC
0.30
0.50
V
V
OL
Low-level output voltage
V
IH
= MIN, I
OL
= MAX
5%V
CC
0.30
0.50
V
V
IK
Input clamp voltage
V
CC
= MIN, I
I
= I
IK
0.73
1.2
V
I
I
Input current at maximum input voltage
V
CC
= MAX, V
I
= 7.0V
100
A
I
IH
High-level input current
V
CC
= MAX, V
I
= 2.7V
20
A
I
Low level input current
I0
V
CC
= MAX V = 0 5V
0.6
mA
I
IL
Low-level input current
I1 I7, EI
V
CC
= MAX, V
I
= 0.5V
1.2
mA
I
OS
Short-circuit output current
3
V
CC
= MAX
60
150
mA
I
CC
Supply current (total)
4
V
CC
= MAX
23
35
mA
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at V
CC
= 5V, T
amb
= 25
C.
3. Not more than one output should be shorted at a time. For testing I
OS
, the use of high-speed test apparatus and/or sample-and-hold
techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting
of a High output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any
sequence of parameter tests, I
OS
tests should be performed last.
4. To measure I
CC
, outputs must be open, V
IN
on all inputs = 4.5V.
Philips Semiconductors
Product specification
74F148
8-input priority encoder
March 1, 1990
6
AC ELECTRICAL CHARACTERISTICS
LIMITS
SYMBOL
PARAMETER
TEST
CONDITION
V
CC
= +5.0V
T
amb
= +25
C
C
L
= 50pF, R
L
= 500
V
CC
= +5.0V
10%
T
amb
= 0
C to +70
C
C
L
= 50pF, R
L
= 500
UNIT
MIN
TYP
MAX
MIN
MAX
t
PLH
t
PHL
Propagation delay
In to An
Waveform 2
3.5
3.5
6.0
6.0
9.0
9.0
3.5
3.5
10.0
10.0
ns
t
PLH
t
PHL
Propagation delay
In to EO
Waveform 1
1.5
1.5
3.0
2.5
6.5
6.5
1.5
1.5
7.5
7.5
ns
t
PLH
t
PHL
Propagation delay
In to GS
Waveform 2
2.0
2.0
4.0
4.0
8.0
8.0
2.0
2.0
9.0
9.0
ns
t
PLH
t
PHL
Propagation delay
EI to An
Waveform 2
3.5
3.0
6.0
5.5
8.5
8.0
3.5
3.0
9.5
9.0
ns
t
PLH
t
PHL
Propagation delay
EI to GS
Waveform 2
2.5
3.0
4.5
5.5
7.0
7.5
2.5
3.0
8.0
8.5
ns
t
PLH
t
PHL
Propagation delay
EI to EO
Waveform 2
3.0
3.5
5.0
5.0
7.0
7.5
3.0
3.5
8.0
9.0
ns
AC WAVEFORMS
For all waveforms, V
M
= 1.5V.
VM
VM
VM
VM
An, EO, GS
In, EI
tPHL
tPLH
SF00186
Waveform 1.
For Inverting Outputs
VM
VM
VM
VM
An, EO, GS
In, EI
tPHL
tPLH
SF00187
Waveform 2.
For Non-Inverting Outputs
TEST CIRCUIT AND WAVEFORMS
tw
90%
VM
10%
90%
VM
10%
90%
VM
10%
90%
VM
10%
NEGATIVE
PULSE
POSITIVE
PULSE
tw
AMP (V)
0V
0V
tTHL (tf
)
INPUT PULSE REQUIREMENTS
rep. rate
t
w
t
TLH
t
THL
1MHz
500ns
2.5ns
2.5ns
Input Pulse Definition
VCC
family
74F
D.U.T.
PULSE
GENERATOR
RL
CL
RT
VIN
VOUT
Test Circuit for Totem-Pole Outputs
DEFINITIONS:
R
L
= Load resistor;
see AC ELECTRICAL CHARACTERISTICS for value.
C
L
= Load capacitance includes jig and probe capacitance;
see AC ELECTRICAL CHARACTERISTICS for value.
R
T
= Termination resistance should be equal to Z
OUT
of
pulse generators.
tTHL (tf
)
tTLH (tr
)
tTLH (tr
)
AMP (V)
amplitude
3.0V
1.5V
V
M
SF00006
Philips Semiconductors
Product specification
74F148
8-input priority encoder
1990 Mar 01
7
DIP16:
plastic dual in-line package; 16 leads (300 mil)
SOT38-4
Philips Semiconductors
Product specification
74F148
8-input priority encoder
1990 Mar 01
8
SO16:
plastic small outline package; 16 leads; body width 3.9 mm
SOT109-1
Philips Semiconductors
Product specification
74F148
8-input priority encoder
1990 Mar 01
9
NOTES
Philips Semiconductors
Product specification
74F148
8-input priority encoder
yyyy mmm dd
10
Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.
Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one
or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or
at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended
periods may affect device reliability.
Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips
Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or
modification.
Disclaimers
Life support -- These products are not designed for use in life support appliances, devices or systems where malfunction of these products can
reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications
do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application.
Right to make changes -- Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard
cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless
otherwise specified.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 940883409
Telephone 800-234-7381
Copyright Philips Electronics North America Corporation 1998
All rights reserved. Printed in U.S.A.
print code
Date of release: 10-98
Document order number:
9397-750-05078
Philips
Semiconductors
Data sheet
status
Objective
specification
Preliminary
specification
Product
specification
Product
status
Development
Qualification
Production
Definition
[1]
This data sheet contains the design target or goal specifications for product development.
Specification may change in any manner without notice.
This data sheet contains preliminary data, and supplementary data will be published at a later date.
Philips Semiconductors reserves the right to make chages at any time without notice in order to
improve design and supply the best possible product.
This data sheet contains final specifications. Philips Semiconductors reserves the right to make
changes at any time without notice in order to improve design and supply the best possible product.
Data sheet status
[1]
Please consult the most recently issued datasheet before initiating or completing a design.