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74HC147 Datasheet PDF
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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
Product specification
File under Integrated Circuits, IC06
December 1990


74HC147 Datasheet PDF
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Philips Semiconductors
10-to-4 line priority encoder
Product specification
74HC/HCT147
FEATURES
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
GENERAL DESCRIPTION
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
SYMBOL
PARAMETER
CONDITIONS
tPHL/ tPLH
CI
CPD
propagation delay An to Yn
input capacitance
power dissipation capacitance per package
CL = 15 pF; VCC = 5 V
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
TYPICAL
HC
15
3.5
30
HCT
17
3.5
33
UNIT
ns
pF
pF
ORDERING INFORMATION
See “74HC/HCT/HCU/HCMOS Logic Package Information”.
December 1990
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Philips Semiconductors
10-to-4 line priority encoder
PIN DESCRIPTION
PIN NO.
8
9, 7, 6, 14
11, 12, 13, 1, 2, 3, 4, 5, 10
15
16
SYMBOL NAME AND FUNCTION
GND
ground (0 V)
Y0 to Y3
A0 to A8
n.c.
BCD address outputs (active LOW)
decimal data inputs (active LOW)
not connected
VCC positive supply voltage
Product specification
74HC/HCT147
Fig.1 Pin configuration.
Fig.2 Logic symbol.
December 1990
Fig.3 IEC logic symbol.
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Philips Semiconductors
10-to-4 line priority encoder
Product specification
74HC/HCT147
Fig.4 Functional diagram.
FUNCTION TABLE
A0
H
A1
H
A2
H
A3
H
INPUTS
A4
H
A5
H
A6
H
A7
H
A8
H
Y3
H
OUTPUTS
Y2
H
Y1
H
Y0
H
XXXXXXXXL L HHL
XXXXXXXL HL HHH
XXXXXXL HHHL L L
XXXXXL HHHHL L H
XXXXL HHHHHL HL
XXXL HHHHHHL HH
XXL HHHHHHHHL L
XL HHHHHHHHHL H
L HHHHHHHHHHHL
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
December 1990
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74HC147 Datasheet PDF
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Philips Semiconductors
10-to-4 line priority encoder
Product specification
74HC/HCT147
Fig.5 Logic diagram.
December 1990
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74HC147 Datasheet PDF
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Philips Semiconductors
10-to-4 line priority encoder
Product specification
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)
SYMBOL PARAMETER
74HC
+25 40 to +85
min. typ. max. min. max.
tPHL/ tPLH
propagation delay
An to Yn
tTHL/ tTLH
output transition
time
50 160
18 32
14 27
19 75
7 15
66
200
40
34
95
19
16
40 to +125
min. max.
240
48
41
110
22
19
UNIT
ns
ns
TEST CONDITIONS
VCC WAVEFORMS
(V)
2.0
4.5 Fig.6
6.0
2.0
4.5 Fig.6
6.0
December 1990
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74HC147 Datasheet PDF
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Philips Semiconductors
10-to-4 line priority encoder
Product specification
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
A3, A4, A7, A8
A5, A6, A0, A1, A2
UNIT LOAD COEFFICIENT
1.50
1.10
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
SYMBOL PARAMETER
74HCT
+25 40 to +85
min. typ. max. min. max.
tPHL/ tPLH
tTHL/ tTLH
propagation delay
An to Yn
output transition
time
20 35
7 15
44
19
40 to +125
min. max.
53
22
UNIT
ns
ns
TEST CONDITIONS
VCC WAVEFORMS
(V)
4.5 Fig.6
4.5 Fig.6
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
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