74HCT147N [NXP]
10-TO-4 LINE PRIORITY ENCODER; 10至4线优先编码器
| 型号： | 74HCT147N |
| 厂家： | 
NXP |
| 描述： | 10-TO-4 LINE PRIORITY ENCODER |
| 文件： | 总7页 (文件大小：45K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
INTEGRATED CIRCUITS
DATA SHEET
For a complete data sheet, please also download:
• The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications
• The IC06 74HC/HCT/HCU/HCMOS Logic Package Information
• The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
74HC/HCT147
10-to-4 line priority encoder
December 1990
Product specification
File under Integrated Circuits, IC06
Philips Semiconductors
Product specification
10-to-4 line priority encoder
74HC/HCT147
FEATURES
GENERAL DESCRIPTION
• Encodes 10-line decimal to 4-line BCD
• Useful for 10-position switch encoding
• Used in code converters and generators
• Output capability: standard
• ICC category: MSI
The 74HC/HCT147 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT147 9-input priority encoders accept data
from nine active LOW inputs (A0 to A8) and provide a
binary representation on the four active LOW outputs
(Y0 to Y3). 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 A8 having the highest priority.
The devices provide the 10-line to 4-line priority encoding
function by use of the implied decimal “zero”. The “zero” is
encoded when all nine data inputs are HIGH, forcing all
four outputs HIGH.
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
TYPICAL
SYMBOL
PARAMETER
CONDITIONS
UNIT
HC
HCT
17
tPHL/ tPLH
CI
propagation delay An to Yn
CL = 15 pF; VCC = 5 V 15
ns
input capacitance
3.5
30
3.5
33
pF
pF
CPD
power dissipation capacitance per package notes 1 and 2
Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW):
PD = CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where:
fi = input frequency in MHz
fo = output frequency in MHz
∑ (CL × VCC2 × fo) = sum of outputs
CL = output load capacitance in pF
VCC = supply voltage in V
2. For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC − 1.5 V
ORDERING INFORMATION
See “74HC/HCT/HCU/HCMOS Logic Package Information”.
December 1990
2
Philips Semiconductors
Product specification
10-to-4 line priority encoder
74HC/HCT147
PIN DESCRIPTION
PIN NO.
SYMBOL NAME AND FUNCTION
8
GND
ground (0 V)
9, 7, 6, 14
Y0 to Y3
A0 to A8
n.c.
BCD address outputs (active LOW)
decimal data inputs (active LOW)
not connected
11, 12, 13, 1, 2, 3, 4, 5, 10
15
16
VCC
positive supply voltage
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
December 1990
3
Philips Semiconductors
Product specification
10-to-4 line priority encoder
74HC/HCT147
Fig.4 Functional diagram.
FUNCTION TABLE
INPUTS
OUTPUTS
A0
A1
A2
A3
A4
A5
A6
A7
A8
Y3
Y2
Y1
Y0
H
H
H
H
H
H
H
H
H
H
H
H
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
X
X
L
X
L
H
H
L
L
L
H
H
H
H
L
H
H
L
L
H
L
H
H
H
H
L
L
H
X
X
X
X
X
X
X
L
X
X
L
X
L
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
H
H
H
H
L
L
H
L
H
H
H
H
L
H
L
H
H
H
H
H
H
H
H
H
H
H
L
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
December 1990
4
Philips Semiconductors
Product specification
10-to-4 line priority encoder
74HC/HCT147
Fig.5 Logic diagram.
December 1990
5
Philips Semiconductors
Product specification
10-to-4 line priority encoder
74HC/HCT147
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
74HC
SYMBOL PARAMETER
UNIT
WAVEFORMS
VCC
(V)
+25
−40 to +85
−40 to +125
min. typ. max. min. max. min. max.
50
18
14
160
32
27
200
40
34
240
48
41
2.0
4.5
6.0
propagation delay
An to Yn
tPHL/ tPLH
ns
Fig.6
Fig.6
19
7
6
75
15
6
95
19
16
110
22
19
2.0
4.5
6.0
output transition
time
t
THL/ tTLH
ns
December 1990
6
Philips Semiconductors
Product specification
10-to-4 line priority encoder
74HC/HCT147
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: MSI
Note to HCT types
The value of additional quiescent supply current (∆ICC) for a unit load of 1 is given in the family specifications.
To determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT
UNIT LOAD COEFFICIENT
A3, A4, A7, A8
1.50
A5, A6, A0, A1, A2 1.10
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
74HCT
SYMBOL PARAMETER
UNIT
WAVEFORMS
VCC
(V)
+25
−40 to +85
−40 to +125
min. typ. max. min. max. min. max.
propagation delay
An to Yn
tPHL/ tPLH
tTHL/ tTLH
20
7
35
15
44
19
53
22
ns
ns
4.5
4.5
Fig.6
Fig.6
output transition
time
AC WAVEFORMS
(1) HC : VM = 50%; VI = GND to VCC
.
HCT: VM = 1.3 V; VI = GND to 3 V.
Fig.6 Waveforms showing the decimal data inputs (An) to output (Yn) propagation delays and the output
transition times.
PACKAGE OUTLINES
See “74HC/HCT/HCU/HCMOS Logic Package Outlines”.
December 1990
7
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