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74HC155
Dual 2-to-4-line Decoders/Demultiplexers
M54 HC155
M74HC155DUAL2 TO4 LINE DECODER3 TO8 LINE DECODER
B1R(Plastic Package)
ORDER CODES:M54HC155F1R M74HC155M1R
M74HC155B1R M74HC155C1R
F1R(CeramicPackage)
M1R(MicroPackage)
C1R(Chip Carrier)
PIN CONNECTIONS (top view)= Internal
DESCRIPTION HIGH SPEED
tPD=12ns (TYP.) AT VCC =5V. LOWPOWER DISSIPATION
ICC =4 μA (MAX.) ATTA =25°C. HIGH NOISE IMMUNITY
VNIH =VNIL =28% VCC (MIN.). OUTPUT DRIVE CAPABILITY LSTTL LOADS. SYMMETRICAL OUTPUT IMPEDANCE
IOH =IOL=4 mA (MIN.). BALANCEDPROPAGATION DELAYS
tPLH =tPHL. WIDE OPERATING VOLTAGE RANGE
VCC (OPR)=2V TO6V. PIN AND FUNCTION COMPATIBLE
WITH 54/74LS155
The M54/74HC155 isa high speed CMOS DUAL2-
TO-4 LINE DECODER fabricatedin silicon gate2 MOS technology. has the same high speed performanceof LSTTL
combined with true CMOS low power consumption. features dual 1-TO-4 line demultiplexers with indi-
vidualstrobe inputs (1G and 2G), individual datain-
puts (1C and 2C) and common binary address
inputs(A and B).
Whenboth decoders are enabled bythestrobes, the
inverted outputof 1C data and non-inverted output 2C data willbe broughtto the select output pins each sections.A 1-TO-8 line demultiplexer can
alsobe easily builtupby providinga data signalto
both 1C and 2C inputs; the output order from the
msbis 1Y3, 1Y2, 1Y1, 1Y0, 2Y3, 2Y2, 2Y1, 2Y0.
This device canbe usedasa 2-to-4 line decoderor 3-to-8 line decoder when 1Cis held high and 2C held low.
INPUT AND OUTPUT EQUIVALENT CIRCUIT IEC LOGIC SYMBOL
PIN DESCRIPTION
PIN No SYMBOL NAME AND FUNCTION15 1C,2C Data Inputs14 1G,2G Strobe Inputs13 B,A Common Data Inputs6,5,4 1Y0to 1Y3 Outputs 10, 11,12 2Y0to 2Y3 Outputs GND Ground (0V) VCC Positive Supply Voltage
TRUTH TABLE
INPUTS OUTPUTS A 2G 2C 2Y0 2Y1 2Y2 2Y3 X HX H HHH L L L L HHH L L H L H H
HLL L H H L H
HHL LHH H L X X H H HHH
TRUTH TABLE
INPUTS OUTPUTS A 1G 1C 1Y0 1Y1 1Y2 1Y3XXH X H H H H L H L H H H HLH H L H H LH H H L H L HHH H L
XXX L H H H H
M54/M74HC155
LOGIC CIRCUIT
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value UnitVCC Supply Voltage -0.5to+7 V DC Input Voltage -0.5to VCC+ 0.5 V DC Output Voltage -0.5to VCC+ 0.5 V
IIK DC Input Diode Current ±20 mA
IOK DC Output Diode Current ±20 mA DC Output Source Sink Current Per Output Pin ±25 mA
ICCor IGND DC VCCor Ground Current ±50 mA Power Dissipation 500(*) mW
Tstg Storage Temperature -65to +150 oC Lead Temperature (10 sec) 300 oC
Absolute MaximumRatings arethose values beyond whichdamage tothedevicemayoccur.Functional operation under theseconditionisnotimplied.
(*)500 mW:≅65oC derate to300mWby 10mW/oC:65o Cto85oC
M54/M74HC155
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Value UnitVCC Supply Voltage 2to6 V Input Voltage 0to VCC V Output Voltage 0to VCC V
Top Operating Temperature:
M54HC Series
M74HC Series
-55to +125
-40to +85CC
tr,tf Input Rise and Fall Time VCC=2V 0to 1000 ns
VCC=4.5V 0to 500
VCC=6V 0to 400
SPECIFICATIONS
Symbol Parameter
Test Conditions Value
UnitVCC(V)
=25oC
54HC and 74HC
-40to85oC
74HC
-55to 125oC
54HC
Min. Typ. Max. Min. Max. Min. Max.VIH High Level Input
Voltage
2.0 1.5 1.5 1.54.5 3.15 3.15 3.15
6.0 4.2 4.2 4.2
VIL Low Level Input
Voltage
2.0 0.5 0.5 0.54.5 1.35 1.35 1.35
6.0 1.8 1.8 1.8
VOH High Level
Output Voltage
2.0 VI=
VIH
VIL
IO=-20μA
1.9 2.0 1.9 1.94.5 4.4 4.5 4.4 4.4
6.0 5.9 6.0 5.9 5.9
4.5 IO=-4.0 mA 4.18 4.31 4.13 4.10
6.0 IO=-5.2 mA 5.68 5.8 5.63 5.60
VOL Low Level Output
Voltage
2.0 VI=
VIH
VIL
IO=20μA
0.0 0.1 0.1 0.14.5 0.0 0.1 0.1 0.1
6.0 0.0 0.1 0.1 0.1
4.5 IO= 4.0 mA 0.17 0.26 0.33 0.40
6.0 IO= 5.2 mA 0.18 0.26 0.33 0.40 Input Leakage
Current 6.0 VI =VCCor GND ±0.1 ±1 ±1 μA
ICC Quiescent Supply
Current
6.0 VI =VCCor GND 4 40 80 μA
M54/M74HC155
ELECTRICAL CHARACTERISTICS (CL =50 pF, Inputtr =tf =6 ns)
Symbol Parameter
Test Conditions Value
UnitVCC(V)
=25oC
54HC and 74HC
-40to85oC
74HC
-55to 125oC
54HC
Min. Typ. Max. Min. Max. Min. Max.tTLH
tTHL
Output Transition
Time
2.0 30 75 95 1104.5 8 151922
6.0 7 131619
tPLH
tPHL
Propagation
Delay Time
2.0 45 130 165 1954.5 15 26 33 39
6.0 13 22 28 33
CIN Input Capacitance 5 10 10 10 pF
CPD(*) Power Dissipation
Capacitance pF
(*) CPD isdefinedasthe valueofthe IC’sinternal equivalent capacitance which iscalculated fromthe operatingcurrent consumption without load.
(Referto Test Circuit).Average operting currentcanbe obtained bythefollowingequation. ICC(opr)=CPD •VCC •fIN+ICC
SWITCHING CHARACTERISTICS TEST WAVEFORM
M54/M74HC155
TEST WAVEFORM ICC (Opr.)
INPUT WAVEFORMIS THESAMEAS THATIN CASEOF SWITCHINGCHARACTERISTICSTEST.
M54/M74HC155
