N74F148N,602 [NXP]
N74F148N;
| 型号： | N74F148N,602 |
| 厂家： | 
NXP |
| 描述： | N74F148N 编码器 光电二极管 输出元件 逻辑集成电路 |
| 文件： | 总10页 (文件大小：97K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
INTEGRATED CIRCUITS
74F148
8-input priority encoder
Product specification
IC15 Data Handbook
1990 Mar 01
Philips
Semiconductors
Philips Semiconductors
Product specification
8-input priority encoder
74F148
FEATURES
PIN CONFIGURATION
• Code conversions
I4
I5
I6
I7
EI
1
2
3
4
5
16
V
CC
• Multi-channel D/A converter
15 EO
14 GS
13 I3
12 I2
11 I1
10 I0
• Decimal-to-BCD converter
• Cascading for priority encoding of “N” bits
• Input enable capability
A2
A1
6
7
8
• 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
GND
9
A0
SF00181
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.
TYPICAL
PROPAGATION
DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
TYPE
74F148
6.0ns
23mA
ORDERING INFORMATION
COMMERCIAL RANGE
= 5V ±10%,
V
DESCRIPTION
PKG DWG #
CC
T
amb
= 0°C to +70°C
16-pin plastic DIP
16-pin plastic SO
N74F148N
SOT38-4
N74F148D
SOT109-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
I1 – I7
I0
DESCRIPTION
Priority inputs (active Low)
74F (U.L.) HIGH/LOW
LOAD VALUE HIGH/LOW
20µA/1.2mA
1.0/2.0
1.0/1.0
1.0/2.0
50/33
Priority input (active Low)
Enable input (active Low)
Enable output (active Low)
Group select output (active Low)
Address outputs (active Low)
20µA/0.6mA
EI
20µA/1.2mA
EO
1.0mA/20mA
GS
50/33
1.0mA/20mA
A0 – A2
50/33
1.0mA/20mA
NOTE: One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state.
2
March 1, 1990
853–0345 98994
Philips Semiconductors
Product specification
8-input priority encoder
74F148
LOGIC SYMBOL
IEC/IEEE SYMBOL
10
11
12
I2
13
I3
1
2
3
4
10
9
7
8
HPRI/BIN
10/Z10
0 α
1 α
2 α
11
12
13
1
11/Z11
2/Z12
I0
I1
I4
I5
I6
I7
3/Z13
4/Z14
5/Z15
EO
GS
15
14
5
EI
≥ 1
2
10
11
12
13
14
15
3
4
5
6/Z16
7/Z17
A0
9
A1
7
A2
6
15
14
18
α
EN = α/V18
16
17
V
= Pin 16
CC
GND = Pin 8
SF00182
SF00183
LOGIC DIAGRAM
EI
I7
I6
I5
I4
I3
I2
I1
I0
5
4
3
2
1
13
12
11
10
9
9
9
14
GS
15
EO
A2
A1
A0
V
= Pin 16
CC
GND = Pin 8
SF00184
3
March 1, 1990
Philips Semiconductors
Product specification
8-input priority encoder
74F148
FUNCTION TABLE
INPUTS
OUTPUTS
EI
H
L
L
L
L
L
L
L
L
L
I0
X
H
X
X
X
X
X
X
X
L
I1
X
H
X
X
X
X
X
X
L
I2
X
H
X
X
X
X
X
L
I3
X
H
X
X
X
X
L
I4
X
H
X
X
X
L
I5
X
H
X
X
L
I6
X
H
X
L
I7
X
H
L
GS
H
H
L
A0
H
H
L
A1
H
H
L
A2
H
H
L
EO
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
L
L
L
H
H
H
H
H
H
L
H
H
L
L
H
H
H
H
H
L
H
L
L
H
H
H
H
L
H
H
H
H
H
H
H
L
H
L
L
H
H
L
H
H
H
L
H
H = High voltage level
L = Low voltage level
X = Don’t care
APPLICATION
ENABLE
LSB
I0
MSB
I7
I1
I2
I3
I4
I5
I6
I7
I0
I1
I2
I3
I4
I5
I6
EI
EI
EO
GS
EO
GS
A0
A1
A2
A0
A1
A2
A0
A1
A2
A3
FLAG
16-Input Priority Encoder
SF00185
4
March 1, 1990
Philips Semiconductors
Product specification
8-input priority encoder
74F148
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
–0.5 to +7.0
–0.5 to +7.0
–30 to +5
UNIT
V
V
Supply voltage
Input voltage
Input current
CC
IN
V
V
I
mA
V
IN
V
Voltage applied to output in High output state
Current applied to output in Low output state
Operating free-air temperature range
Storage temperature range
–0.5 to V
40
OUT
OUT
CC
I
mA
°C
°C
T
amb
0 to +70
T
stg
–65 to +150
RECOMMENDED OPERATING CONDITIONS
LIMITS
SYMBOL
PARAMETER
UNIT
MIN
4.5
NOM
MAX
V
Supply voltage
5.0
5.5
V
V
CC
IH
IL
V
V
High-level input voltage
Low-level input voltage
Input clamp current
2.0
0.8
–18
–1
V
I
I
I
mA
mA
mA
°C
IK
High-level output current
Low-level output current
OH
OL
20
T
amb
Operating free-air temperature range
0
+70
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
LIMITS
1
SYMBOL
PARAMETER
TEST CONDITIONS
UNIT
V
2
MIN
2.5
TYP
MAX
V
V
V
V
V
V
V
= MIN, V = MAX ±10%V
CC
IL
CC
V
OH
High-level output voltage
= MIN, I = MAX
±5%V
2.7
3.4
IH
OH
CC
= MIN, V = MAX ±10%V
0.30
0.30
0.50
0.50
–1.2
100
20
CC
IL
CC
CC
V
V
Low-level output voltage
V
OL
= MIN, I = MAX
±5%V
IH
OL
Input clamp voltage
= MIN, I = I
IK
–0.73
V
IK
CC
CC
CC
I
I
Input current at maximum input voltage
High-level input current
= MAX, V = 7.0V
µA
I
I
I
= MAX, V = 2.7V
µA
IH
IL
I
I0
I1 – I7, EI
–0.6
–1.2
–150
35
mA
mA
mA
mA
I
Low-level input current
V
CC
= MAX, V = 0.5V
I
3
I
I
Short-circuit output current
V
V
= MAX
= MAX
–60
OS
CC
4
Supply current (total)
23
CC
CC
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 = 5V, T = 25°C.
CC
amb
3. Not more than one output should be shorted at a time. For testing I , the use of high-speed test apparatus and/or sample-and-hold
OS
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 tests should be performed last.
OS
4. To measure I , outputs must be open, V on all inputs = 4.5V.
CC
IN
5
March 1, 1990
Philips Semiconductors
Product specification
8-input priority encoder
74F148
AC ELECTRICAL CHARACTERISTICS
LIMITS
V
= +5.0V
= +25°C
= +5.0V ± 10%
= 0°C to +70°C
CC
CC
TEST
CONDITION
T
amb
SYMBOL
PARAMETER
UNIT
C = 50pF, R = 500Ω
L
L
MIN
TYP
MAX
MIN
MAX
t
t
Propagation delay
In to An
3.5
3.5
6.0
6.0
9.0
9.0
3.5
3.5
10.0
10.0
PLH
PHL
Waveform 2
Waveform 1
Waveform 2
Waveform 2
Waveform 2
Waveform 2
ns
ns
ns
ns
ns
ns
t
t
Propagation delay
In to EO
1.5
1.5
3.0
2.5
6.5
6.5
1.5
1.5
7.5
7.5
PLH
PHL
t
t
Propagation delay
In to GS
2.0
2.0
4.0
4.0
8.0
8.0
2.0
2.0
9.0
9.0
PLH
PHL
t
t
Propagation delay
EI to An
3.5
3.0
6.0
5.5
8.5
8.0
3.5
3.0
9.5
9.0
PLH
PHL
t
t
Propagation delay
EI to GS
2.5
3.0
4.5
5.5
7.0
7.5
2.5
3.0
8.0
8.5
PLH
PHL
t
t
Propagation delay
EI to EO
3.0
3.5
5.0
5.0
7.0
7.5
3.0
3.5
8.0
9.0
PLH
PHL
AC WAVEFORMS
For all waveforms, V = 1.5V.
M
In, EI
V
V
M
In, EI
V
V
M
M
M
t
t
t
t
PHL
PLH
PHL
PLH
V
V
V
V
M
M
M
M
An, EO, GS
An, EO, GS
SF00186
SF00187
Waveform 1. For Inverting Outputs
Waveform 2. For Non-Inverting Outputs
TEST CIRCUIT AND WAVEFORMS
t
AMP (V)
0V
V
w
CC
90%
90%
NEGATIVE
PULSE
V
V
M
M
10%
10%
V
V
OUT
IN
PULSE
GENERATOR
D.U.T.
t
t )
t
t )
THL ( f
TLH ( r
R
C
R
L
t
t )
T
L
t
t )
TLH ( r
THL ( f
AMP (V)
0V
90%
M
90%
POSITIVE
PULSE
V
V
M
10%
10%
Test Circuit for Totem-Pole Outputs
DEFINITIONS:
t
w
Input Pulse Definition
INPUT PULSE REQUIREMENTS
R
L
C
L
R
T
=
=
=
Load resistor;
see AC ELECTRICAL CHARACTERISTICS for value.
Load capacitance includes jig and probe capacitance;
see AC ELECTRICAL CHARACTERISTICS for value.
family
V
rep. rate
t
w
t
t
THL
amplitude
3.0V
M
TLH
Termination resistance should be equal to Z
pulse generators.
of
OUT
2.5ns 2.5ns
74F
1.5V
1MHz
500ns
SF00006
6
March 1, 1990
Philips Semiconductors
Product specification
8-input priority encoder
74F148
DIP16: plastic dual in-line package; 16 leads (300 mil)
SOT38-4
7
1990 Mar 01
Philips Semiconductors
Product specification
8-input priority encoder
74F148
SO16: plastic small outline package; 16 leads; body width 3.9 mm
SOT109-1
8
1990 Mar 01
Philips Semiconductors
Product specification
8-input priority encoder
74F148
NOTES
9
1990 Mar 01
Philips Semiconductors
Product specification
8-input priority encoder
74F148
Data sheet status
[1]
Data sheet
status
Product
status
Definition
Objective
specification
Development
This data sheet contains the design target or goal specifications for product development.
Specification may change in any manner without notice.
Preliminary
specification
Qualification
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.
Product
specification
Production
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.
[1] Please consult the most recently issued datasheet before initiating or completing a design.
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.
Righttomakechanges—PhilipsSemiconductorsreservestherighttomakechanges, withoutnotice, intheproducts, includingcircuits,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
Copyright Philips Electronics North America Corporation 1998
All rights reserved. Printed in U.S.A.
Sunnyvale, California 94088–3409
Telephone 800-234-7381
print code
Date of release: 10-98
9397-750-05078
Document order number:
Philips
Semiconductors
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