DM54LS20 Datasheet
Part Number |
DM54LS20 |
Manufacturers |
National Semiconductor |
Logo |
|
Description |
Dual 4-Input NAND Gates |
Datasheet |
DM54LS20 Datasheet (PDF) |
54LS20 DM54LS20 DM74LS20 Dual 4-Input NAND Gates
June 1989
54LS20 DM54LS20 DM74LS20 Dual 4-Input NAND Gates
General Description
This device contains two independent gates each of which performs the logic NAND function
Features
Y Alternate Military Aerospace device (54LS20) is available Contact a National Semiconductor Sales Office Distributor for specifications
Connection Diagram
Dual-In-Line Package
Function Table
Order Number 54LS20DMQB 54LS20FMQB 54LS20LMQB DM54LS20J DM54LS20W DM74LS20M or DM74LS20N
See NS Package Number E20A J14A M14A N14A or W14B
TL F 6355 – 1
Y e ABCD
Inputs
A B CD
X X XL X X LX X L XX L X XX H H HH
H e High Logic Level L e Low Logic Level X e Either Low or High Logic Level
Output
Y
H H H H L
C1995 National Semiconductor Corporation TL F 6355
RRD-B30M105 Printed in U S A
Absolute Maximum Ratings (Note)
If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifi.
Part Number |
DM54LS299 |
Manufacturers |
National Semiconductor |
Logo |
|
Description |
8-Input Universal Shift/Storage Register with Common Parallel I/O Pins |
Datasheet |
DM54LS299 Datasheet (PDF) |
DM54LS299 DM74LS299 8-Input Universal Shift Storage Register with Common Parallel I O Pins
June 1992
DM54LS299 DM74LS299 8-Input Universal Shift Storage Register with Common Parallel I O Pins
General Description
The ’LS299 is an 8-bit universal shift storage register with TRI-STATE outputs Four modes of operation are possible hold (store) shift left shift right and load data The parallel load inputs and flip-flop outputs are multiplexed to reduce the total number of package pins Separate outputs are provided for flip-flops Q0 and Q7 to allow easy cascading A separate active LOW Master Reset is used to reset the register
Features
Y Y
Y
Y
Common I O for reduced pin count Four operation m.
Part Number |
DM54LS283 |
Manufacturers |
National Semiconductor |
Logo |
|
Description |
4-Bit Binary Adders with Fast Carry |
Datasheet |
DM54LS283 Datasheet (PDF) |
54LS283 DM54LS283 DM74LS283 4-Bit Binary Adders with Fast Carry
June 1989
54LS283 DM54LS283 DM74LS283 4-Bit Binary Adders with Fast Carry
General Description
These full adders perform the addition of two 4-bit binary numbers The sum (R) outputs are provided for each bit and the resultant carry (C4) is obtained from the fourth bit These adders feature full internal look ahead across all four bits This provides the system designer with partial lookahead performance at the economy and reduced package count of a ripple-carry implementation The adder logic including the carry is implemented in its true form meaning that the end-around carry can be accomplished without the need for logic or leve.
Part Number |
DM54LS279 |
Manufacturers |
National Semiconductor |
Logo |
|
Description |
Quad S-R Latches |
Datasheet |
DM54LS279 Datasheet (PDF) |
54LS279 DM54LS279 DM74LS279 Quad S-R Latches
May 1989
54LS279 DM54LS279 DM74LS279 Quad S-R Latches
General Description
The ’LS279 consists of four individual and independent SetReset Latches with active low inputs Two of the four latches have an additonal S input ANDed with the primary S input A low on any S input while the R input is high will be stored in the latch and appear on the corresponding Q output as a high A low on the R input while the S input is high will clear the Q output to a low Simultaneous transistion of the R and S inputs from low to high will cause the Q output
to be indeterminate Both inputs are voltage level triggered and are not affected by transition time of the .
Part Number |
DM54LS273 |
Manufacturers |
National Semiconductor |
Logo |
|
Description |
8-Bit Register with Clear |
Datasheet |
DM54LS273 Datasheet (PDF) |
DM54LS273 DM74LS273 8-Bit Register with Clear
April 1992
DM54LS273 DM74LS273 8-Bit Register with Clear
General Description
The ’LS273 is a high speed 8-bit register consisting of eight D-type flip-flops with a common Clock and an asynchronous active LOW Master Reset This device is supplied in a 20pin package featuring 0 3 inch row spacing
Features
Y Y Y Y
Edge-triggered 8-bit high speed register Parallel in and out Common clock and master reset
Connection Diagram
Dual-In-Line Package
TL F 9825 – 1
Order Number DM54LS273E DM54LS273J DM54LS273W DM74LS273M or DM74LS273N See NS Package Number E20A J20A M20B N20A or W20A Pin Names CP D0–D7 MR Q0–Q7 Description Clock Pulse Input (Active Ris.
Part Number |
DM54LS260 |
Manufacturers |
National Semiconductor |
Logo |
|
Description |
Dual 5-Input NOR Gate |
Datasheet |
DM54LS260 Datasheet (PDF) |
DM54LS260 DM74LS260 Dual 5-Input NOR Gate
DM54LS260 DM74LS260 Dual 5-Input NOR Gate
General Description
This device contains two individual five input gates each of which perform the logic NOR function
Connection Diagram
Dual-In-Line Package
April 1992
Truth Table
TL F 9824 – 1
Order Number DM54LS260J DM54LS260W DN54LS260E DM74LS260M or DM74LS260N See NS Package Number E20A J14A M14A N14A or W14B
AaBaCaDaEeY
Inputs
Outputs
ABCDE
Y
LLLLL XXXXH XXXHX XXHXX XHXXX HXXXX
H L L L L L
C1995 National Semiconductor Corporation TL F 9824
RRD-B30M115 Printed in U S A
Absolute Maximum Ratings (Note)
If Military Aerospace specified devices are required please contact the National Semico.
Dual 4-Input NAND Gates
54LS20 DM54LS20 DM74LS20 Dual 4-Input NAND Gates
June 1989
54LS20 DM54LS20 DM74LS20 Dual 4-Input NAND Gates
General Description
This device contains two independent gates each of which performs the logic NAND function
Features
Y Alternate Military Aerospace device (54LS20) is available Contact a National Semiconductor Sales Office Distributor for specifications
Connection Diagram
Dual-In-Line Package
Function Table
Order Number 54LS20DMQB 54LS20FMQB 54LS20LMQB DM54LS20J DM54LS20W DM74LS20M or DM74LS20N
See NS Package Number E20A J14A M14A N14A or W14B
TL F 6355 – 1
Y e ABCD
Inputs
A B CD
X X XL X X LX X L XX L X XX H H HH
H e High Logic Level L e Low Logic Level X e Either Low or High Logic Level
Output
Y
H H H H L
C1995 National Semiconductor Corporation TL F 6355
RRD-B30M105 Printed in U S A
Absolute Maximum Ratings (Note)
If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
DM54LS and 54LS
b55 C to a125 C
DM74LS
0 C to a70 C
Storage Temperature Range
b65 C to a150 C
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 Operati.
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