SGS Thomson Microelectronics M74HC147 Datasheet
.HIGH SPEED
tPD= 15 ns(TYP.) at VCC=5V
.LOWPOWERDISSIPATION
ICC=4µA(MAX.) at TA=25°C
.HIGH NOISEIMMUNITY
V
NIH=VNIL
=28%VCC(MIN.)
.OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.SYMMETRICALOUTPUT IMPEDANCE
IOH =IOL= 4 mA(MIN.)
.BALANCEDPROPAGATION DELAYS
t
PLH=tPHL
.WIDE OPERATINGVOLTAGE RANGE
VCC(OPR)= 2V to 6 V
.PIN ANDFUNCTION COMPATIBLE
WITH 54/74LS147
DESCRIPTION
M54HC147
M74HC147
10 TO 4 LINE PRIORITY ENCODER
B1R
(PlasticPackage)
M1R
(MicroPackage)
ORDER CODES :
M54HC 147F1R M74H C147M1R
M74HC 147B1R M74HC1 47C1R
F1R
(CeramicPackage)
C1R
(Chip Carrier)
The M54/74HC147 is ahighspeedCMOS10 TO 4
LINE PRIORITY ENCODER fabricated in silicon
gate C2MOS technology. It has the same high
speed performance of LSTTL combined with true
CMOS low powerconsumption.
This device features priority encoding of the inputs
to ensure thatonly the highest order data lineis encoded. Nine input lines are encoded to a four line
BCD output. Theimplied decimal zero condition requires no input condition as zero is encoded when
allninedatalinesareathighlogic level.Alldatainput
and outputs are active at the low logiclevel. All inputs are equipped with protection circuits against
staticdischarge and transient excessvoltage.
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN CONNECTIONS(top view)
October 1992
NC =
No Internal
Connection
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M54/M74HC147
TRUTH TABLE
INPUTS OUTPUTS
1 2 3 4 56 789DCBA
HHHHHHHHHHHHH
XXXXXXXXLLHHL
XXXXXXXLHLHHH
XXXXXXLHHHLLL
XXXXXLHHHHLLH
XXXXLHHHHHLHL
XXXLHHHHHHLHH
XXLHHHHHHHHLL
XLHHHHHHHHHLH
LHHHHHHHHHHHL
X:Don’t Care
LOGI C DIAGRAM
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M54/M74HC147
PIN DESCRIPTION
IEC LOGIC SYMBOL
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,
1 to 9 Decimal Data Inputs
(Active LOW)
5, 10
15 NC Not Connected
8 GND Ground (0V)
16 V
CC
Positive Supply Voltage
ABSOLU TE MAXIMU M RAT INGS
Symbol Parameter Value Unit
V
CC
V
V
O
I
IK
I
OK
I
O
I
or I
CC
P
D
T
stg
T
AbsoluteMaximumRatingsarethose values beyondwhichdamage tothedevicemayoccur. Functionaloperationunder these conditionisnotimplied.
(*)500 mW: ≅ 65oC derateto300mWby 10mW/oC: 65oCto85oC
Supply Voltage -0.5 to +7 V
DC Input Voltage -0.5 to VCC+ 0.5 V
I
DC Output Voltage -0.5 to VCC+ 0.5 V
DC Input Diode Current ± 20 mA
DC Output Diode Current ± 20 mA
DC Output Source Sink Current Per Output Pin ± 25 mA
DC VCCor Ground Current ± 50 mA
GND
Power Dissipation 500 (*) mW
Storage Temperature -65 to +150
Lead Temperature (10 sec) 300
L
o
C
o
C
RECO MM ENDED OPERATIN G C ONDI TI O NS
Symbol Parameter Value Unit
V
T
t
V
V
r,tf
Supply Voltage 2 to 6 V
CC
Input Voltage 0 to V
I
Output Voltage 0 to V
O
Operating Temperature: M54HC Series
op
M74HC Series
CC
CC
-55 to +125
-40 to +85
Input Rise and Fall Time VCC= 2 V 0 to 1000 ns
V
= 4.5 V 0 to 500
CC
V
= 6 V 0 to 400
CC
V
V
o
C
o
C
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