SGS Thomson Microelectronics M74HC158, M74HC157 Datasheet
HC157 QUAD 2 CHANNEL MULTIPLEXER
HC158 QUAD 2 CHANNEL MULTIPLEXER(INV.)
.HIGH SPEED
tPD= 10 ns (TYP.) AT VCC=5V
.LOWPOWER DISSIPATION
ICC=4 µA (MAX.) AT TA=25 °C
.HIGH NOISE IMMUNITY
V
NIH=VNIL
=28%VCC(MIN.)
.OUTPUTDRIVE CAPABILITY
10 LSTTL LOADS
.SYMMETRICALOUTPUT IMPEDANCE
IOH =IOL= 4 mA(MIN.)
.BALANCEDPROPAGATIONDELAYS
t
PLH=tPHL
.WIDE OPERATINGVOLTAGE RANGE
VCC(OPR)= 2 V TO 6 V
.PIN ANDFUNCTION COMPATIBLE
WITH 54/74LS157/158
M54HC157/158
M7 4HC1 57 /1 58
B1R
(PlasticPackage)
M1R
(MicroPackage)
ORDER CODES :
M54HC X XXF1R M74H CXXXM1R
M74HC X XXB1R M74HCX X XC1R
F1R
(CeramicPackage)
C1R
(Chip Carrier)
DESCRIPTION
The M54/74HC157 and theM54/74HC158arehigh
speed CMOS QUAD 2-CHANNEL MULTIPLEXER’sfabricated withsilicongate C2MOStechnology. They achieve the high speed operation
similar to equivalent LSTTL while maintaining the
CMOS low powerdissipation.
These devices consist of four 2-input digital multiplexerswithcommon select and strobe inputs. The
HC158 is an inverting multiplexer while the HC157
is a non-inverting multiplexer. When the STROBE
inputis held High, selection of data is inhibited and
all the outputs become Low in the M74HC157 and
High in the M74HC158. The SELECT decoding
determines whether the A or B inputs get routed to
their corresponding Y outputs. All inputs are
equipped with protection circuits against static discharge and transient excess voltage.
PIN CONNECTIONS(top view)
HC157
HC158
NC =
No Internal
Connection
February 1993
1/11
M54/M74HC157 M54/M74HC158
CHIP CARRIER
HC157 HC158
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION ( f or HC157)
PIN No SYMBOL NAME AND FUNCTION
1 SELECT Common Data Select
Input
2, 5, 11, 14 1A to 4A Data Inputs From
Source A
3, 6, 10, 13 1B to 4B Data Inputs From
Source B
4, 7, 9, 12 1Y to 4Y Multiplexer Output
15 STROBE Strobe Input
8 GND Ground (0V)
16 V
2/11
CC
Positive Supply Voltage
PIN DESCRIPTION (for HC158)
PIN No SYMBOL NAME AND FUNCTION
1 SELECT Common Data Select
Input
2, 5, 11, 14 1A to 4A Data Inputs From
Source A
3, 6, 10, 13 1B to 4B Data Inputs From
Source B
4, 7, 9, 12 1Y to 4Y Multiplexer Output
15 STROBE Strobe Input
8 GND Ground (0V)
16 V
CC
Positive Supply Voltage
M54/M74HC157 M 54/M74 HC158
TRUTH TABLE
INPUTS OUTPUTS
STROBE SELECT A B Y (HC157) Y (HC158)
HXXXLH
LLLXLH
LLHXHL
LHXLLH
LHXHHL
X:DON’TCARE
IEC LOGIC SYMBOL
HC157 HC158
LOGIC DIAGRAM
HC157 HC158
3/11
M54/M74HC157 M54/M74HC158
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
AbsoluteMaximumRatingsare thosevaluesbeyond whichdamage tothedevicemayoccur.Functional operationunder theseconditionisnotimplied.
(*)500 mW:≅65oC derate to300 mW by 10mW/oC: 65oCto85oC
RECO MM ENDED OPERAT I N G C ONDITIONS
Symbol Parameter Value Unit
V
CC
V
I
V
O
T
op
t
r,tf
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
Supply Voltage 2 to 6 V
Input Voltage 0 to V
Output Voltage 0 to V
Operating Temperature: M54HC Series
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
o
C
o
C
V
V
o
C
o
C
4/11
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