SGS Thomson Microelectronics M74HC42 Datasheet
.HIGH SPEED
tPD= 13 ns (TYP.) AT VCC=5V
.LOWPOWER DISSIPATION
ICC=4µA(MAX.) AT TA=25°C
.HIGH NOISEIMMUNITY
V
NIH=VNIL
=28%VCC(MIN.)
.OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.SYMMETRICAL OUTPUT IMPEDANCE
|IOH|=IOL=4 mA (MIN.)
.BALANCEDPROPAGATION DELAYS
t
PLH=tPHL
.WIDE OPERATINGVOLTAGERANGE
VCC(OPR)= 2 V TO 6 V
.PIN AND FUNCTION COMPATIBLE
WITH 54/74LS42
DESCRIPTION
The M54/74HC42 is a high speedCMOS BCD-TODECIMAL DECODER fabricated in silicon gate
C2MOS technology.
It has the same high speed performance of LSTTL
combined with true CMOSlowpower consumption.
A BCD code applied to the four inputs A-D selects
one of ten decimal outputs Y0-Y9, which goes low
tofifteengives ahigh levelatalloutputs.This device
alsocanbeusedas a3-to-8LINEDECODER,when
the D inputis assignedas a disable input. Thisdevice is useful for code conversion, address decoding, memory selection, demultiplexing, or readout
decoding.
Allinputs areequipped withprotection circuitsagainst
staticdischarge and transientexcess voltage.
M54HC42
M74HC42
BCD TO DECIMAL DECODER
B1R
(PlasticPackage)
M1R
(MicroPackage)
ORDER CODES :
M54HC 42F1R M74H C42M1R
M74HC 42B1R M 74HC42C1R
PIN CONNECTIONS(top view)
F1R
(CeramicPackage)
C1R
(Chip Carrier)
INPUT AND OUTPUT EQUIVALENT CIRCUIT
December1992
NC =
No Internal
Connection
1/10
M54/M74HC42
PIN DESCRIPTION
PIN No SYMBOL NAME AND FUNCTION
15, 14, 13,12A, B, C, D Data Inputs
1, 2, 3, 4,
to Y
Y
0
Multiplexer Outputs
9
5, 6, 7, 9,
10, 11
8 GND Ground (0V)
16 V
CC
Positive Supply Voltage
LOGI C DIAG RAM
IEC LOGIC SYMBOL
2/10
FUN CTIO N AL TABLE
M54/M74HC42
CODE No.
BCD INPUTS DECIMAL OUTPUTS
DCBAY
Y1Y2Y3Y4Y5Y6Y7Y8Y
0
9
0 LLLLLHHHHHHHHH
1 LLLHHLHHHHHHHH
2 LLHLHHLHHHHHHH
3 LLHHHHHLHHHHHH
4 LHLLHHHHLHHHHH
5 LHLHHHHHHLHHHH
6 LHHLHHHHHHLHHH
7 LHHHHHHHHHHLHH
8 HLLLHHHHHHHHLH
9 HLLHHHHHHHHHHL
10 HLHLHHHHHHHHHH
11 HLHHHHHHHHHHHH
12 HHLLHHHHHHHHHH
13 HHLHHHHHHHHHHH
14 HHHLHHHHHHHHHH
15 HHHHHHHHHHHHHH
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
L
AbsoluteMaximumRatingsarethosevalues beyondwhichdamage tothedevicemayoccur. Functional operationunder theseconditionisnotimplied.
(*)500 mW: ≅ 65oC derate to300 mW by 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
o
C
o
C
RECO MM ENDED OPERATI N G CONDI 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
= 4.5 V 0 to 500
V
CC
V
= 6 V 0 to 400
CC
V
V
o
C
o
C
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