Homedatasheet54LS157

54LS157 Datasheet

Multiplexers->CMOS/BiCMOS->HC/HCT Family
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Description

Features, Applications

These data selectors multiplexers contain inverters and drivers to supply full on-chip data selection to the four output gates A separate strobe input is provided A 4-bit word is selected from one of two sources and is routed to the four outputs The LS157 presents true data whereas the LS158 presents inverted data to minimize propagation delay time

Features
Applications

Expand any data input point Multiplex dual data buses Generate four functions of two variables (one variable is common) Source programmable counters

Buffered inputs and outputs Typical Propagation Time 7 ns Typical Power Dissipation 24 mW Alternate Military Aerospace device 54LS158) is available Contact a National Semiconductor Sales Office Distributor for specifications

If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Input Voltage 7V Note The ``Absolute Maximum Ratings'' are those values beyond which the safety of the device cannot be guaranteed The device should not be operated at these limits The parametric values defined in the ``Electrical Characteristics'' table are not guaranteed at the absolute maximum ratings The ``Recommended Operating Conditions'' table will define the conditions for actual device operation

Operating Free Air Temperature Range C DM54LS and 70 C Storage Temperature Range

Symbol VCC VIH VIL IOH IOL TA Parameter Min Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Free Air Operating Temperature

over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH Parameter Input Clamp Voltage High Level Output Voltage Low Level Output Voltage Conditions VCC e Min b18 mA VCC e Min IOH e Max VIL e Max VIH e Min VCC e Min IOL e Max VIL e Max VIH e Min IOL 4 mA VCC e Min II Input Current Input Voltage Max VCC e Max e 7V VCC e Max 2 7V VCC e Max 0 4V VCC e Max (Note 2) VCC e Max (Note DM54 DM74

High Level Input Current Low Level Input Current Short Circuit Output Current Supply Current

Note 1 All typicals are at VCC 25 C Note 2 Not more than one output should be shorted at a time and the duration should not exceed one second Note 3 ICC is measured with 4 5V applied to all inputs and all outputs open

at VCC e 5V and 25 C (See Section 1 for Test Waveforms and Output Load) Symbol Parameter From (Input) To (Output) Data to Y Data to Y Strobe to Y Strobe to Y Select to Y Select 15 pF Min tPLH tPHL tPLH tPHL tPLH tPHL Propagation Delay Time Low to High Level Output Propagation Delay Time High to Low Level Output Propagation Delay Time Low to High Level Output Propagation Delay Time High to Low Level Output Propagation Delay Time Low to High Level Output Propagation Delay Time High to Low Level Output Max 50 pF Min Max ns Units

over recommended operating free air temperature range (unless otherwise noted) Symbol VI VOH VOL Parameter Input Clamp Voltage High Level Output Voltage Low Level Output Voltage Conditions VCC e Min b18 mA VCC e Min IOH e Max VIL e Max VIH e Min VCC e Min IOL e Max VIL e Max VIH e Min IOL 4 mA VCC e Min II IIH IIL IOS ICC Input Current Input Voltage Max VCC e Max e 7V VCC e Max 2 7V VCC e Max 0 4V VCC e Max (Note 2) VCC e Max (Note DM54 DM74

Note 1 All typicals are at VCC 25 C Note 2 Not more than one output should be shorted at a time and the duration should not exceed one second Note 3 ICC is measured with 4 5V applied to all inputs and all outputs open


Features

Parameters

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Manufacturer information

Warm Hint

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