M74HC147
10 TO 4 LINE PRIORITY ENCODER
s
s
s
s
s
s
s
HIGH SPEED:
t
PD
= 15ns (TYP.) at V
CC
= 6V
LOW POWER DISSIPATION:
I
CC
= 4µA(MAX.) at T
A
=25°C
HIGH NOISE IMMUNITY:
V
NIH
= V
NIL
= 28 % V
CC
(MIN.)
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 4mA (MIN)
BALANCED PROPAGATION DELAYS:
t
PLH
≅
t
PHL
WIDE OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 2V to 6V
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 147
DIP
SOP
TSSOP
ORDER CODES
PACKAGE
DIP
SOP
TSSOP
TUBE
M74HC147B1R
M74HC147M1R
DESCRIPTION
The M74HC147 is an high speed CMOS 10 TO 4
LINE PRIORITY ENCODER fabricated with
silicon gate C
2
MOS technology.
This device features priority encoding of the inputs
to ensure that only the highest order data line is
encoded. Nine input lines are encoded to a four
line BCD output. The implied decimal zero
PIN CONNECTION AND IEC LOGIC SYMBOLS
O
so
b
te
le
ro
P
uc
d
s)
t(
so
b
-O
condition requires no input condition as zero is
encoded when all nine data lines are at high logic
level. All data inputs and outputs are active at the
low logic level.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
P
te
le
od
r
M74HC147RM13TR
M74HC147TTR
s)
t(
uc
T&R
July 2001
1/10
M74HC147
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
9, 7, 6, 14
11, 12, 13, 1,
2, 3, 4, 5, 10
15
8
16
SYMBOL
A to D
1 to 9
NC
GND
V
CC
NAME AND FUNCTION
BCD Address Outputs
(Active Low)
Decimal Data Inputs
(Active Low)
Not Connected
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUTS
1
H
X
X
X
X
X
X
X
X
L
X : Don’t Care
OUTPUTS
6
H
X
X
X
L
H
H
H
H
H
7
H
X
X
L
H
H
H
H
H
H
8
H
X
L
H
H
H
H
H
H
H
9
H
L
H
H
H
H
H
H
H
H
D
H
L
L
H
H
H
H
H
H
H
C
H
H
H
L
L
L
L
H
H
H
2
H
X
X
X
X
X
X
X
L
H
3
H
X
X
X
X
X
X
L
H
H
4
H
X
X
X
X
X
L
H
H
H
5
H
X
X
X
X
L
H
H
H
H
LOGIC DIAGRAM
O
so
b
te
le
ro
P
uc
d
s)
t(
so
b
-O
P
te
le
od
r
s)
t(
uc
B
H
H
H
L
L
H
H
L
L
H
A
H
L
H
L
H
L
H
L
H
L
This logic diagram has not be used to estimate propagation delays
2/10
M74HC147
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
Supply Voltage
DC Input Voltage
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Current
Parameter
Value
-0.5 to +7
-0.5 to V
CC
+ 0.5
-0.5 to V
CC
+ 0.5
±
20
±
20
±
25
±
50
500(*)
-65 to +150
300
Unit
V
V
V
mA
mA
mA
mA
mW
°C
°C
I
CC
or I
GND
DC V
CC
or Ground Current
P
D
Power Dissipation
T
stg
T
L
Storage Temperature
Lead Temperature (10 sec)
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
(*) 500mW at 65
°
C; derate to 300mW by 10mW/
°
C from 65
°
C to 85
°
C
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
I
V
O
T
op
t
r
, t
f
Supply Voltage
Input Voltage
Output Voltage
Operating Temperature
Input Rise and Fall Time
Parameter
V
CC
= 2.0V
O
so
b
te
le
ro
P
uc
d
s)
t(
b
-O
V
CC
= 4.5V
V
CC
= 6.0V
so
te
le
r
P
0 to V
CC
0 to V
CC
od
2 to 6
Value
s)
t(
uc
Unit
V
V
V
°C
ns
ns
ns
-55 to 125
0 to 1000
0 to 500
0 to 400
3/10
M74HC147
DC SPECIFICATIONS
Test Condition
Symbol
Parameter
V
CC
(V)
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
V
OL
Low Level Output
Voltage
2.0
4.5
6.0
4.5
6.0
I
I
I
CC
Input Leakage
Current
Quiescent Supply
Current
6.0
6.0
I
O
=-20
µA
I
O
=-20
µA
I
O
=-20
µA
I
O
=-4.0 mA
I
O
=-5.2 mA
I
O
=20
µA
I
O
=20
µA
I
O
=20
µA
I
O
=4.0 mA
I
O
=5.2 mA
V
I
= V
CC
or GND
V
I
= V
CC
or GND
T
A
= 25°C
Min.
1.5
3.15
4.2
0.5
1.35
1.8
1.9
4.4
5.9
4.18
5.68
2.0
4.5
6.0
4.31
5.8
0.0
0.0
0.0
0.17
0.18
0.1
0.1
0.1
0.26
0.26
1.9
4.4
5.9
4.13
5.63
0.1
0.1
Typ.
Max.
Value
-40 to 85°C
Min.
1.5
3.15
4.2
0.5
1.35
1.8
1.9
4.4
5.9
V
4.10
5.60
Max.
-55 to 125°C
Min.
1.5
3.15
4.2
0.5
1.35
1.8
Max.
V
Unit
V
IH
High Level Input
Voltage
Low Level Input
Voltage
High Level Output
Voltage
V
IL
V
V
OH
O
so
b
te
le
ro
P
uc
d
s)
t(
so
b
-O
P
te
le
±
0.1
4
od
r
0.1
0.33
0.33
±
1
40
s)
t(
uc
0.1
0.1
0.1
0.40
0.40
±
1
80
V
µA
µA
4/10
M74HC147
AC ELECTRICAL CHARACTERISTICS
(C
L
= 50 pF, Input t
r
= t
f
= 6ns)
Test Condition
Symbol
Parameter
V
CC
(V)
2.0
4.5
6.0
2.0
4.5
6.0
T
A
= 25°C
Min.
Typ.
30
8
7
60
18
15
Max.
75
15
13
125
30
26
Value
-40 to 85°C
Min.
Max.
95
19
16
190
38
32
-55 to 125°C
Min.
Max.
110
22
19
225
45
38
ns
Unit
t
TLH
t
THL
Output Transition
Time
t
PLH
t
PHL
Propagation Delay
Time
ns
CAPACITIVE CHARACTERISTICS
Test Condition
Symbol
Parameter
V
CC
(V)
5.0
5.0
T
A
= 25°C
Min.
Typ.
5
24
Max.
10
Value
-40 to 85°C
Min.
Max.
10
-55 to 125°C
Min.
C
IN
C
PD
Input Capacitance
Power Dissipation
Capacitance (note
1)
1) C
PD
is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I
CC(opr)
= C
PD
x V
CC
x f
IN
+ I
CC
TEST CIRCUIT
O
C
L
= 50pF or equivalent (includes jig and probe capacitance)
R
T
= Z
OUT
of pulse generator (typically 50Ω)
so
b
te
le
ro
P
uc
d
s)
t(
so
b
-O
P
te
le
od
r
ct
u
Max.
10
s)
(
Unit
pF
pF
5/10
