SGS Thomson Microelectronics M74HCT158, M74HCT157 Datasheet
HCT157QUAD 2 CHANNEL MULTIPLEXER
HCT158 QUAD2 CHANNEL MULTIPLEXER (INV.)
.HIGH SPEED
tPD= 21 ns (TYP.) AT VCC=5V
.LOWPOWER DISSIPATION
ICC=4 µA (MAX.) AT TA=25 °C
.COMPATIBLE WITHTTL OUTPUTS
VIH= 2V (MIN.) VIL= 0.8V (MAX)
.OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.SYMMETRICAL OUTPUT IMPEDANCE
IOH =IOL= 4 mA (MIN.)
.BALANCEDPROPAGATION DELAYS
t
PLH=tPHL
.PIN AND FUNCTION COMPATIBLE
WITH 54/74LS157/158
M54HCT157/158
M74HCT157/158
B1R
(PlasticPackage)
M1R
(MicroPackage)
ORDER CODES :
M54HC TXXX F 1R M74H CTXXXM1R
M74HC TXXX B1R M74HCT XXX C1R
F1R
(CeramicPackage)
C1R
(Chip Carrier)
DESCRIPTION
The M54/74HCT157 and the M54/74HCT158 are
high speed CMOS QUAD 2-CHANNEL MULTIPLEXERs fabricated withsilicongate C2MOStechnology. They achieve the high speed operation
similar to equivalent LSTTL while maintaining the
CMOS low power dissipation.
These devices consist of four 2-input digital multiplexerswith common select and strobe inputs.The
HCT158 is an inverting multiplexer while the
HCT157 is a non-inverting multiplexer. When the
STROBEinput is held High, selection of data is inhibited and all the outputs become Low in the
M74HCT157 and High in theM74HCT158. TheSELECT decoding determines whether the A or B inputs get routed to theircorresponding Y outputs.All
inputs are equipped with protection circuits against
static discharge and transient excess voltage.
M54/74HCT devices are designed to directlyinterfaceHSC2MOSsystemswith TTLandNMOScomponents. They are also plug in replacements for
LSTTL devices giving a reduction of power consumption.
PIN CONNECTIONS(top view)
HCT157
HCT158
NC =
No Internal
Connection
April1993
1/11
M54/M74HCT157 M54/M74HCT158
CHIP CARRIER
HCT157 HCT158
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION (for HCT157)
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 StrobeInput
8 GND Ground (0V)
16 V
2/11
CC
Positive Supply Voltage
PIN DESCRIPTIO N (for HCT158)
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/M74HCT157 M54/M74HCT158
TRUTH TABLE
INPUTS OUTPUTS
STROBE SELECT A B Y (HCT157) Y (HCT158)
HXXXLH
LLLXLH
LLHXHL
LHXLLH
LHXHHL
X:DON’TCARE
IEC LOGIC SYMBOL
HCT157 HCT158
LOGIC DIAGRAM
HCT157 HCT158
3/11
M54/M74HCT157 M54/M74HCT158
ABSOLU TE MAXIMUM RATINGS
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
AbsoluteMaximumRatingsarethosevaluesbeyondwhichdamagetothedevicemayoccur.Functionaloperationunder theseconditionisnotimplied.
(*)500 mW:≅65oC derate to300 mW by 10mW/oC: 65oCto85oC
RECO MM ENDED OPERAT I N G CONDI TI ONS
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 4.5 to 5.5 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= 4.5 to 5.5V) 0 to 500 ns
o
C
o
C
V
V
o
C
o
C
4/11
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