SGS Thomson Microelectronics M74HC155 Datasheet
DUAL 2 TO 4 LINE DECODER 3 TO 8 LINE DECODER
.HIGH SPEED
tPD= 12 ns (TYP.) ATVCC=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)= 2V TO 6 V
.PIN AND FUNCTION COMPATIBLE
WITH 54/74LS155
M54HC155
M74HC155
B1R
(PlasticPackage)
M1R
(MicroPackage)
ORDER CODES :
M54HC 155F1R M74H C155M1 R
M74HC 155B1R M74HC1 55C1R
F1R
(CeramicPackage)
C1R
(Chip Carrier)
DESCRIPTION
The M54/74HC155 isa high speedCMOSDUAL2TO-4 LINE DECODER fabricated in silicon gate
C2MOS technology.
It has the samehigh speed performance of LSTTL
combined with true CMOSlowpower consumption.
It features dual 1-TO-4 linedemultiplexers withindividualstrobeinputs (1G and 2G), individual datainputs (1C and 2C) and common binary address
inputs (A andB).
Whenbothdecodersareenabled bythestrobes, the
inverted output of 1C dataand non-inverted output
of 2C data will be brought to the select output pins
of each sections. A 1-TO-8 line demultiplexer can
also be easily built up by providing a datasignal to
both 1C and 2C inputs ; the output order from the
msb is 1Y3, 1Y2, 1Y1, 1Y0, 2Y3, 2Y2, 2Y1, 2Y0.
This device canbe used as a2-to-4line decoder or
a 3-to-8 line decoder when 1C isheld highand 2C
is heldlow.
All inputs are equipped with protection circuits
against static discharge and transient excess voltage.
PIN CONNECTIONS(top view)
NC =
No Internal
Connection
December1992
1/11
M54/M74HC155
INPUT AND OUTPUT EQUIVALENT CIRCUIT IEC LOGIC SYMBOL
PIN DESCRIPTION
PIN No SYMBOL NAME AND FUNCTION
1, 15 1C, 2C Data Inputs
2, 14 1G, 2G Strobe Inputs
3, 13 B, A Common Data Inputs
7, 6, 5, 4 1Y0 to 1Y3 Outputs
9, 10, 11, 12 2Y0 to 2Y3 Outputs
8 GND Ground (0V)
16 V
CC
Positive Supply Voltage
TRUTH TABLE
INPUTS OUTPUTS
B A 1G 1C 1Y0 1Y1 1Y2 1Y3
XXHXHHHH
LLLHLHHH
LHLHHLHH
HLLHHHLH
HHLHHHHL
XXXLHHHH
TRUTH TABLE
INPUTS OUTPUTS
B A 2G 2C 2Y0 2Y1 2Y2 2Y3
XXHXHHHH
LLLLLHHH
LHLLHLHH
HLLLHHLH
HHLLHHHL
XXXHHHHH
2/11
LOGI C CI RCU I T
M54/M74HC155
ABSOLU TE M AXIMU M R AT 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
3/11
M54/M74HC155
RECO MM ENDED OPERAT I N G CO NDI TIONS
Symbol Parameter Value Unit
V
V
V
T
t
r,tf
DC SPECIFICATIONS
Symbol Parameter
V
IH
V
V
OH
V
OL
I
I
CC
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
Test Conditions Value
V
(V)
CC
=25oC
T
A
54HC and 74HC
-40 to 85oC
74HC
-55 to 125oC
Min. Typ. Max. Min. Max. Min. Max.
High Level Input
Voltage
2.0 1.5 1.5 1.5
4.5 3.15 3.15 3.15
6.0 4.2 4.2 4.2
Low Level Input
IL
Voltage
2.0 0.5 0.5 0.5
4.5 1.35 1.35 1.35
6.0 1.8 1.8 1.8
High Level
Output Voltage
Low Level Output
Voltage
Input Leakage
I
Current
Quiescent Supply
2.0
V
=
I
4.5 4.4 4.5 4.4 4.4
6.0 5.9 6.0 5.9 5.9
4.5 I
6.0 I
2.0
4.5 0.0 0.1 0.1 0.1
6.0 0.0 0.1 0.1 0.1
4.5 I
6.0 I
6.0
IO=-20 µA
V
IH
or
V
IL
=-4.0 mA 4.18 4.31 4.13 4.10
O
=-5.2 mA 5.68 5.8 5.63 5.60
O
V
=
I
IO=20µA
V
IH
or
V
IL
= 4.0 mA 0.17 0.26 0.33 0.40
O
= 5.2 mA 0.18 0.26 0.33 0.40
O
VI=VCCor GND ±0.1 ±1 ±1 µA
1.9 2.0 1.9 1.9
0.0 0.1 0.1 0.1
6.0 VI=VCCor GND 4 40 80 µA
Current
54HC
V
V
o
C
o
C
Unit
V
V
V
V
4/11
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