M54HC147
M74HC147
October 1992
10 TO 4 LINE PRIORITY ENCODER
B1R
(Plastic Package)
ORDER CODES :
M54HC147F1R M74HC147M1R
M74HC147B1R M74HC147C1R
F1R
(CeramicPackage)
M1R
(Micro Package)
C1R
(Chip Carrier)
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
INPUT AND OUTPUT EQUIVALENT CIRCUIT
DESCRIPTION
.HIGH SPEED
t
PD
= 15 ns (TYP.) at V
CC
=5V
.LOW POWER DISSIPATION
I
CC
=4µA (MAX.) at T
A
=25°C
.HIGH NOISE IMMUNITY
V
NIH
=V
NIL
=28%V
CC
(MIN.)
.OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.SYMMETRICAL OUTPUT IMPEDANCE
I
OH
=I
OL
= 4 mA (MIN.)
.BALANCEDPROPAGATION DELAYS
t
PLH
=t
PHL
.WIDE OPERATING VOLTAGE RANGE
V
CC
(OPR) = 2 V to 6 V
.PIN AND FUNCTION COMPATIBLE
WITH 54/74LS147
The M54/74HC147 is a high speed CMOS 10 TO 4
LINE PRIORITY ENCODER fabricated in silicon
gate C
2
MOS technology. It has the same high
speed performance of LSTTL combined with true
CMOS low power consumption.
This device features priority encoding of the inputs
to ensure that only the highest order data line is en-
coded. Nine input lines are encoded to a four line
BCD output. The implied decimal zero condition re-
quires no input condition as zero is encoded when
allnine datalinesare athighlogic level.Alldatainput
and outputs are active at the low logic level. All in-
puts are equipped with protection circuits against
static discharge and transient excess voltage.
1/10
PIN DESCRIPTION
PIN No SYMBOL NAME AND FUNCTION
9, 7, 6, 14 A to D BCD Address Outputs
(Active LOW)
11, 12, 13,
1, 2, 3, 4,
5, 10
1 to 9 Decimal Data Inputs
(Active LOW)
15 NC Not Connected
8 GND Ground (0V)
16 V
CC
Positive Supply Voltage
IEC LOGIC SYMBOL
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
CC
Supply Voltage -0.5 to +7 V
V
I
DC Input Voltage -0.5 to V
CC
+ 0.5 V
V
O
DC Output Voltage -0.5 to V
CC
+ 0.5 V
I
IK
DC Input Diode Current ± 20 mA
I
OK
DC Output Diode Current ± 20 mA
I
O
DC Output Source Sink Current Per Output Pin ± 25 mA
I
CC
or I
GND
DC V
CC
or Ground Current ± 50 mA
P
D
Power Dissipation 500 (*) mW
T
stg
Storage Temperature -65 to +150
o
C
T
L
Lead Temperature (10 sec) 300
o
C
Absolute MaximumRatingsare those values beyond whichdamage tothe device mayoccur. Functional operation under these condition isnotimplied.
(*) 500 mW: ≅ 65
o
C derate to 300 mW by 10mW/
o
C: 65
o
Cto85
o
C
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Value Unit
V
CC
Supply Voltage 2 to 6 V
V
I
Input Voltage 0 to V
CC
V
V
O
Output Voltage 0 to V
CC
V
T
op
Operating Temperature: M54HC Series
M74HC Series
-55 to +125
-40 to +85
o
C
o
C
t
r
,t
f
Input Rise and Fall Time V
CC
= 2 V 0 to 1000 ns
V
CC
= 4.5 V 0 to 500
V
CC
= 6 V 0 to 400
M54/M74HC147
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