DM74S157 • DM74S158 Quad 1 of 2 Line Data Selector/MultiplexerAugust 1986Revised April 2000
DM74S157 • DM74S158
Quad 1 of 2 Line Data Selector/Multiplexer
General Description
These data selectors/multiplexers contain inverters anddrivers to supply full on-chip data selection to the four out-put gates. A separate strobe input is provided. A 4-bit wordis selected from one of two sources and is routed to thefour outputs. The DM74S157 presents true data whereasthe DM74S158 presents inverted data to minimize propa-gation delay time.
Applications
•Expand any data input point•Multiplex dual data buses
•Generate four functions of two variables (one variable iscommon)•Source programmable counters
Features
sBuffered inputs and outputssTypical propagation time
DM74S157 5 nsDM74S158 4 nssTypical power dissipation
DM74S157 250 mWDM74S158 195 mW
Ordering Code:
Order NumberDM74S157NDM74S158N
Package NumberN16EN16E
Package Description16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Connection Diagrams
DM74S157
DM74S158
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DM74S157 • DM74S158Function Table
InputsStrobeHLLLL
H = HIGH LevelL = LOW LevelX = Don’t Care
Output YAXLHXX
BXXXLH
DM74S157DM74S158
LLHLH
HHLHL
SelectXLLHH
Logic Diagrams
DM74S157
DM74S158
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DM74S157 • DM74S158Absolute Maximum Ratings(Note 1)
Supply VoltageInput Voltage
Operating Free Air Temperature RangeStorage Temperature Range
7V5.5V
0°C to +70°C−65°C to +150°C
Note 1: The “Absolute Maximum Ratings” are those values beyond whichthe safety of the device cannot be guaranteed. The device should not beoperated at these limits. The parametric values defined in the ElectricalCharacteristics tables are not guaranteed at the absolute maximum ratings.The “Recommended Operating Conditions” table will define the conditionsfor actual device operation.
DM74157 Recommended Operating Conditions
SymbolVCCVIHVILIOHIOLTA
Supply Voltage
HIGH Level Input VoltageLOW Level Input VoltageHIGH Level Output CurrentLOW Level Output CurrentFree Air Operating Temperature
0
Parameter
Min4.752
0.8−12070
Nom5
Max5.25
UnitsVVVmAmA°C
DM74S157 Electrical Characteristics
over recommended operating free air temperature (unless otherwise noted)SymbolVIVOHVOLIIIIHIILIOSICC
Parameter
Input Clamp VoltageHIGH Level Output VoltageLOW Level Output VoltageHIGH Level Input CurrentHIGH Level Input Current
Short Circuit Output CurrentSupply Current
Conditions
VCC = Min, II = −18 mAVCC = Min, IOH = MaxVIL = Max, VIH = MinVCC = Min, IOL = MaxVIH = Min, VIL = MaxVCC = MaxVI = 2.7VVCC = MaxVI = 0.5V
VCC = Max (Note 3)VCC = Max (Note 4)
S or GA or BS or GA or B
−40
50
2.7
3.4
0.5110050−4−2−10078
Min
Typ(Note 2)
Max−1.2
UnitsVVVmAµAmAmAmA
Input Current @ Max Input VoltageVCC = Max, VI = 5.5V
Note 2: All typicals are at VCC = 5V, TA = 25°C.
Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.Note 4: ICC is measured 4.5V applied to all inputs and all outputs OPEN.
DM74S157 Switching Characteristics
at VCC = 5V and TA = 25°C
RL = 280Ω
SymboltPLHtPHLtPLHtPHLtPLHtPHL
Parameter
Propagation Delay TimeLOW-to-HIGH Level OutputPropagation Delay TimeHIGH-to-LOW Level OutputPropagation Delay TimeLOW-to-HIGH Level OutputPropagation Delay TimeHIGH-to-LOW Level OutputPropagation Delay TimeLOW-to-HIGH Level OutputPropagation Delay TimeHIGH-to-LOW Level Output
From (Input)To (Output)Data to YData to YStrobe to YStrobe to YSelect to YSelect to Y
CL = 15 pFMin
Max7.56.512.5121515
CL = 50 pFMin
Max101015151717
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DM74S157 • DM74S158DM74S158 Recommended Operating Conditions
SymbolVCCVIHVILIOHIOLTA
Supply Voltage
HIGH Level Input VoltageLOW Level Input VoltageHIGH Level Output CurrentLOW Level Output CurrentFree Air Operating Temperature0ParameterMin4.752
0.8−12070Nom5
Max5.25
UnitsVVVmAmA°CDM74S158 Electrical Characteristics
over recommended operating free air temperature (unless otherwise noted)SymbolVIVOHVOLIIIIHIILIOSICC1ICC2
Parameter
Input Clamp VoltageHIGH Level Output VoltageLOW Level Output VoltageHIGH Level Input CurrentLOW Level Input Current
Short Circuit Output CurrentSupply CurrentSupply Current
Conditions
VCC = Min, II = − 18 mAVCC = Min, IOH = MaxVIL = Max, VIH = MinVCC = Min, IOL = MaxVIH = Min, VIL = MaxVCC = MaxVI = 2.7VVCC = MaxVI = 0.5V
VCC = Max (Note 6)VCC = Max (Note 7)VCC = Max (Note 8)
S or GA or BS or GA or B
−40
39
2.7
3.4
0.5110050−4−2−1006181
Min
Typ(Note 5)
Max−1.2
UnitsVVVmAµAmAmAmAmA
Input Current @ Max Input VoltageVCC = Max, VI = 5.5V
Note 5: All typicals are at VCC = 5V, TA = 25°C.
Note 6: Not more than one output should be shorted at a time, and the duration should not exceed one second.Note 7: ICC1 is measured with all outputs OPEN and all inputs at 4.5V.
Note 8: ICC2 is measured with B, G, and S inputs grounded, A inputs at 4.5V, and all outputs OPEN.
DM74S158 Switching Characteristics
at VCC = 5V and TA = 25 °C
RL = 280Ω
SymboltPLHtPHLtPLHtPHLtPLHtPHL
Parameter
Propagation Delay TimeLOW to-HIGH Level OutputPropagation Delay TimeHIGH-to-LOW Level OutputPropagation Delay TimeLOW-to-HIGH Level OutputPropagation Delay TimeHIGH-to-LOW Level OutputPropagation Delay TimeLOW-to-HIGH Level OutputPropagation Delay TimeHIGH-to-LOW Level Output
From (Input)To (Output)Data to YData to YStrobe to YStrobe to YSelect to YSelect to Y
CL = 15 pFMin
Max6611.5121212
CL = 50 pFMin
Max9912141515
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DM74S157 • DM74S158 Quad 1 of 2 Line Data Selector/MultiplexerPhysical Dimensions inches (millimeters) unless otherwise noted
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N16E
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied andFairchild reserves the right at any time without notice to change said circuitry and specifications.LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORTDEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILDSEMICONDUCTOR CORPORATION. As used herein:1.Life support devices or systems are devices or systemswhich, (a) are intended for surgical implant into thebody, or (b) support or sustain life, and (c) whose failureto perform when properly used in accordance withinstructions for use provided in the labeling, can be rea-sonably expected to result in a significant injury to theuser.
5
2.A critical component in any component of a life supportdevice or system whose failure to perform can be rea-sonably expected to cause the failure of the life supportdevice or system, or to affect its safety or effectiveness.
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