Document
54F 74F157A Quad 2-Input Multiplexer
November 1994
54F 74F157A Quad 2-Input Multiplexer
General Description
The ’F157A 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
Y
Guaranteed 4000V minimum ESD protection
Commercial 74F157APC
Military
Package Number N16E
Package Description 16-Lead (0 300 Wide) Molded Dual-In-Line 16-Lead Ceramic Dual-In-Line 16-Lead (0 150 Wide) Molded Small Outline JEDEC 16-Lead (0 300 Wide) Molded Small Outline EIAJ 16-Lead Cerpack 20-Lead Ceramic Leadless Chip Carrier Type C
54F157ADM (Note 2) 74F157ASC (Note 1) 74F157ASJ (Note 1) 54F157AFM (Note 2) 54F157ALM (Note 2)
J16A M16A M16D W16A E20A
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
Logic Symbols
Connection Diagrams
Pin Assignment for DIP SOIC and Flatpak Pin Assignment for LCC
TL F 9483–3
IEEE IEC
TL F 9483 – 1 TL F 9483 – 2
TL F 9483–5
TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation
TL F 9483
RRD-B30M75 Printed in U S A
www.DataSheet4U.com
www.DataSheet4U.com
Unit Loading Fan Out
54F 74F Pin Names Description UL HIGH LOW 10 10 10 10 10 10 10 10 50 33 3 Input IIH IIL Output IOH IOL 20 mA b0 6 mA 20 mA b0 6 mA 20 mA b0 6 mA 20 mA b0 6 mA b 1 mA 20 mA
I0a – I0d I1a – I1d E S Za – Zd
Source 0 Data Inputs Source 1 Data Inputs Enable Input (Active LOW) Select Input Outputs
Functional Description
The ’F157A 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 of a 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 Zn e E (I1n S a I0n 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 is 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
Truth Table
Inputs E H L L L L S X H H L L I0 X X X L H I1 X L H X X Output Z L L H L H
H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial
Logic Diagram
TL F 9483 – 4
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays
2
Absolute Maximum Ratings (Note 1)
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
b 65 C to a 150 b 55 C to a 125 b 55 C to a 175 b 55 C to a 150
Recommended Operating Conditions
Free Air Ambient Temperature Military Commercial Supply Voltage Military Commercial
b 55 C to a 125 C 0 C to a 70 C a 4 5V to a 5 5V a 4 5V to a 5 5V
C C C C
b 0 5V to a 7 0V b 0 5V to a 7 0V Input Voltage (Note 2) b 30 mA to a 5 0 mA Input Current (Note 2) Voltage Applied to Output in HIGH State (with VCC e 0V) b 0 5V to VCC Standard Output b 0 5V to a 5 5V TRI-STATE Output Current Applied to Output in LOW State (Max) twice the rated IOL (mA)
ESD Last Passing Voltage (Min)
4000V
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
DC Electrical Characteristics
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
b 60
54F 74F Typ Max
Units V 08
b1 2
VCC
Conditions Recognized as a HIGH Signal Recognized as a LOW Signal
20
V V V Min Min
IIN e b18 mA IOH e b1 mA IOH e b1 mA IOH e b1 mA IOL e 20 mA IOL e 20 mA VIN e 2 7V VIN e 7 0V VOUT e VCC IID e 1 9 mA All Other Pins Grounded VIOD e 150 mV All Other Pins Grounded VIN e 0 5V VOUT e 0V VO e HIGH VO e LOW
54F 10% VCC 74F 10% VCC 74F 5% VCC 54F 10% VCC 74F 10% VCC 54F 74F 54F 74F 54F 74F 74F 74F
25 25.