Homedatasheet54F157A

54F157A Datasheet

Military/Aerospace->FAST
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Description

Features, Applications

The is a high-speed quad 2-input multiplexer Four bits of data from two sources can be selected using the common Select and Enable inputs The four outputs present the selected data in the true (non-inverted) form The 'F157A can also be used to generate any four of the 16 different functions to two variables

Features

Package Description (0 300 Wide) Molded Dual-In-Line 16-Lead Ceramic Dual-In-Line (0 150 Wide) Molded Small Outline JEDEC (0 300 Wide) Molded Small Outline EIAJ 16-Lead Cerpack 20-Lead Ceramic Leadless Chip Carrier Type C

Note 1 Devices also available in 13 reel Use suffix e SCX and SJX Note 2 Military grade device with environmental and burn-in processing Use suffix e DMQB FMQB and LMQB

TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation

Source 0 Data Inputs Source 1 Data Inputs Enable Input (Active LOW) Select Input Outputs

The is a quad 2-input multiplexer It selects four bits of data from two sources under the control of a common Select input (S) The Enable input (E) is active LOW When E is HIGH all of the outputs (Z) are forced LOW regardless of all other inputs The 'F157A is the logic implementation 4-pole 2-position switch where the position of the switch is determined by the logic levels supplied to the Select input The logic equations for the outputs are shown below S) A common use of the 'F157A is the moving of data from two groups of registers to four common output busses The particular register from which the data comes is determined by the state of the Select input A less obvious use as a function generator The 'F157A can generate any four of the 16 different functions of two variables with one variable common This is useful for implementing highly irregular logic

H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial

Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays

If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Storage Temperature Ambient Temperature under Bias Junction Temperature under Bias Plastic VCC Pin Potential to Ground Pin Input Voltage (Note 2) Input Current (Note 2) Voltage Applied to Output in HIGH State (with VCC e 0V) Standard Output TRI-STATE Output Current Applied to Output in LOW State (Max) ESD Last Passing Voltage (Min)

Free Air Ambient Temperature Military Commercial Supply Voltage Military Commercial

Note 1 Absolute maximum ratings are values beyond which the device may be damaged or have its useful life impaired Functional operation under these conditions is not implied Note 2 Either voltage limit or current limit is sufficient to protect inputs

Symbol VIH VIL VCD VOH Parameter Min Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Voltage Output LOW Voltage Input HIGH Current Input HIGH Current Breakdown Test Output HIGH Leakage Current Input Leakage Test Output Leakage Circuit Current Input LOW Current Output Short-Circuit Current Power Supply Current Power Supply Current

Conditions Recognized as a HIGH Signal Recognized as a LOW Signal

IIN b18 mA IOH b1 mA IOH b1 mA IOH b1 mA IOL 20 mA IOL 20 mA VIN 2 7V VIN 7 0V VOUT e VCC IID 9 mA All Other Pins Grounded VIOD 150 mV All Other Pins Grounded VIN 0 5V VOUT VO e HIGH VO e LOW


Features

Parameters

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Manufacturer information

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