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74HC148 の電気的特性と機能

74HC148のメーカーはNational Semiconductorです、この部品の機能は「8-3 Line Priority Encoder」です。


製品の詳細 ( Datasheet PDF )

部品番号 74HC148
部品説明 8-3 Line Priority Encoder
メーカ National Semiconductor
ロゴ National Semiconductor ロゴ 




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74HC148 Datasheet, 74HC148 PDF,ピン配置, 機能
February 1988
MM54HC148 MM74HC148
8-3 Line Priority Encoder
General Description
This priority encoder utilizes advanced silicon-gate CMOS
technology It has the high noise immunity and low power
consumption typical of CMOS circuits as well as the speeds
and output drive similar to LB-TTL
This priority encoder accepts 8 input request lines 0– 7 and
outputs 3 lines A0–A2 The priority encoding ensures that
only the highest order data line is encoded Cascading cir-
cuitry (enable input EI and enable output EO) has been pro-
vided to allow octal expansion without the need for external
circuitry All data inputs and outputs are active at the low
logic level
All inputs are protected from damage due to static dis-
charge by internal diode clamps to VCC and ground
Features
Y Typical propagation delay 13 ns
Y Wide supply voltage range 2V – 6V
Connection Diagram
Dual-In-Line Package
Truth Table
Order Number MM54HC148 or MM74HC148
TL F 9390 – 1
Inputs
Outputs
EI 0 1 2 3 4 5 6 7 A2 A1 A0 GS EO
HXXXXXXXX H H H H H
L HHHHHHHH H H H H L
L XXXXXXXL L L L L H
L XXXXXXLH L L H L H
L XXXXX LHH L H L L H
L XXXX LHHH L H H L H
L XXX LHHHH H L L L H
L XX LHHHHH H L H L H
L X LHHHHHH H H L L H
L LHHHHHHH H H H L H
H e High L e Low X e irrelevant
C1995 National Semiconductor Corporation TL F 9390
RRD-B30M105 Printed in U S A

1 Page





74HC148 pdf, ピン配列
AC Electrical Characteristics VCC e 5V TA e 25 C CL e 15 pF tr e tf e 6 ns
Symbol
Parameter
Conditions
Typ
tPHL tPLH
Maximum Propagation Delay
Any Input to Any Output
14
Units
ns
AC Electrical Characteristics VCC e 2 0V to 6 0V CL e 50 pF tr e tf e 6 ns (unless otherwise specified)
Symbol
Parameter
VCC
TA e 25 C
Typ
74HC
b40 C to a85 C
54HC
b55 C to a125 C
Guaranteed Limits
Units
tPHL tPLH
Inputs 0–7
to Outputs
A0 A1 A2
2 0V
140
4 5V
14
28
6 0V
24
175
35
30
210 ns
42 ns
36 ns
tPHL tPLH
Inputs 0–7
to
Output EO
2 0V
140
4 5V
15
28
6 0V
24
175
35
30
210 ns
42 ns
36 ns
tPHL tPLH
Inputs 0–7
to
Output GS
2 0V
160
4 5V
17
32
6 0V
27
200
40
34
240 ns
48 ns
41 ns
tPHL tPLH
Input EI
to Outputs
A0 A1 A2
2 0V
160
4 5V
17
32
6 0V
27
200
40
34
240 ns
48 ns
41 ns
tPHL tPLH
Input EI
to
Output GS
2 0V
100
4 5V
12
20
6 0V
17
125
25
21
150 ns
30 ns
26 ns
tPHL tPLH
Input EI
to
Output EO
2 0V
100
4 5V
12
20
6 0V
17
125
25
21
150 ns
30 ns
26 ns
tf tr
Maximum
2 0V
75
Output Rise
4 5V
7
15
and Fall Time
6 0V
13
95
19
16
110 ns
22 ns
19 ns
Cpd Power Dissipation
52
Capacitance (Note 5)
pF
Cin Maximum Input
Capacitance
5 10
10
Note 5 Cpd determines the no load dynamic power consumption and the no load dynamic current consumption
10
pF
3


3Pages


74HC148 電子部品, 半導体
Physical Dimensions inches (millimeters) (Continued)
Molded Dual-In-Line Package (N)
Order Number MM54HC148 or MM74HC148
NS Package Number N16E
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL
SEMICONDUCTOR CORPORATION As used herein
1 Life support devices or systems are devices or
systems which (a) are intended for surgical implant
into the body or (b) support or sustain life and whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling can
be reasonably expected to result in a significant injury
to the user
2 A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system or to affect its safety or
effectiveness
National Semiconductor
Corporation
1111 West Bardin Road
Arlington TX 76017
Tel 1(800) 272-9959
Fax 1(800) 737-7018
National Semiconductor
Europe
Fax (a49) 0-180-530 85 86
Email cnjwge tevm2 nsc com
Deutsch Tel (a49) 0-180-530 85 85
English Tel (a49) 0-180-532 78 32
Fran ais Tel (a49) 0-180-532 93 58
Italiano Tel (a49) 0-180-534 16 80
National Semiconductor
Hong Kong Ltd
13th Floor Straight Block
Ocean Centre 5 Canton Rd
Tsimshatsui Kowloon
Hong Kong
Tel (852) 2737-1600
Fax (852) 2736-9960
National Semiconductor
Japan Ltd
Tel 81-043-299-2309
Fax 81-043-299-2408
National does not assume any responsibility for use of any circuitry described no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications

6 Page



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