National Semiconductor LS2 fiche technique

No.	Partie #	Fabricant	Description
1	DM54LS20	National Semiconductor	Dual 4-Input NAND Gates 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 DM54LS20
2	DM54LS251	National Semiconductor	TRI-STATE Data Selectors/Multiplexers Y Y Y Y Y Y Y Y TRI-STATE version of LS151 Interface directly with system bus Perform parallel-to-serial conversion Permit multiplexing from N-lines to one line Complementary outputs provide true and inverted data Maximum number of common outputs
3	54LS244	National Semiconductor	Octal TRI-STATE Buffers/Line Drivers/Line Receivers Y TRI-STATE outputs drive bus lines directly Y PNP inputs reduce DC loading on bus lines Y Hysteresis at data inputs improves noise margins Y Typical IOL (sink current) 54LS 12 mA 74LS 24 mA Y Typical IOH (source current) 54LS b12 mA 74LS b15 mA
4	54LS22	National Semiconductor	Dual 4-Input NAND Gates
5	DM74LS221	National Semiconductor	Dual Non-Retriggerable One-Shot Y A dual highly stable one-shot Y Compensated for VCC and temperature variations Y Pin-out identical to ’LS123 (Note 1) Y Output pulse width range from 30 ns to 70 seconds Y Hysteresis provided at (B) input for added noise immunity Y Direct reset te
6	54LS258A	National Semiconductor	TRI-STATE Quad 2-Data Selectors/Multiplexers Y TRI-STATE versions LS157 and LS158 with same pinouts Y Schottky-clamped for significant improvement in A-C performance Y Provides bus interface from multiple sources in highperformance systems Y Average propagation delay from data input 12 ns Y Typ
7	74LS256	National Semiconductor	Dual 4-Bit Addressable Latch Y Serial-to-parallel capability Y Output from each storage bit available Y Random (addressable) data entry Y Easily expandable Y Active low common clear Connection Diagram Logic Symbol Dual-In-Line Package TL F 9823 –1 Order Number 54LS256DMQB 54LS
8	DM74LS20	National Semiconductor	Dual 4-Input NAND Gates Y Alternate Military Aerospace device (54LS20) is available Contact a National Semiconductor Sales Office Distributor for specifications Connection Diagram Dual-In-Line Package TL F 6355 – 1 Order Number 54LS20DMQB 54LS20FMQB 54LS20LMQB DM54LS20J
9	54LS279	National Semiconductor	Quad S-R Latches Y Alternate military aerospace device (54LS279) is available Contact a National Semiconductor Sales Office Distributor for specifications Connection Diagram Dual-In-Line Package www.DataSheet.net/ TL F 6420 – 1 Order Number 54LS279DMQB 54LS279FM
10	74LS258B	National Semiconductor	Quad 2-Data Selectors/Multiplexers Y TRI-STATE versions LS157 and LS158 with same pinouts Y Schottky-clamped for significant improvement in A-C performance Y Provides bus interface from multiple sources in highperformance systems Y Average propagation delay from data input 12 ns Y Typ
11	54LS21	National Semiconductor	Dual 4-Input AND Gates Y Alternate Military Aerospace device (54LS21) is available Contact a National Semiconductor Sales Office Distributor for specifications Connection Diagram Dual-In-Line Package Function Table Order Number 54LS21DMQB 54LS21FMQB 54LS21LMQB DM54LS21
12	54LS257A	National Semiconductor	TRI-STATE Quad 2-Data Selectors/Multiplexers Y TRI-STATE versions LS157 and LS158 with same pinouts Y Schottky-clamped for significant improvement in A-C performance Y Provides bus interface from multiple sources in highperformance systems Y Average propagation delay from data input 12 ns Y Typ
13	DM54LS283	National Semiconductor	4-Bit Binary Adders with Fast Carry Y Y Y Y Y Full-carry look-ahead across the four bits Systems achieve partial look-ahead performance with the economy of ripple carry Typical add times Two 8-bit words 25 ns Two 16-bit words 45 ns Typical power dissipation per 4-bit adder 95 mW Alt
14	74LS245	National Semiconductor	TRI-STATE Octal Bus Transceiver Y Y Y Bi-Directional bus transceiver in a high-density 20-pin package TRI-STATE outputs drive bus lines directly PNP inputs reduce DC loading on bus lines Hysteresis at bus inputs improve noise margins Typical propagation delay times port-to-port
15	74LS283	National Semiconductor	4-Bit Binary Adders Y Y Y Y Y Full-carry look-ahead across the four bits Systems achieve partial look-ahead performance with the economy of ripple carry Typical add times Two 8-bit words 25 ns Two 16-bit words 45 ns Typical power dissipation per 4-bit adder 95 mW Alt
16	DM74LS245	National Semiconductor	TRI-STATE Octal Bus Transceiver Y Y Y Bi-Directional bus transceiver in a high-density 20-pin package TRI-STATE outputs drive bus lines directly PNP inputs reduce DC loading on bus lines Hysteresis at bus inputs improve noise margins Typical propagation delay times port-to-port
17	DM74LS283	National Semiconductor	4-Bit Binary Adders Y Y Y Y Y Full-carry look-ahead across the four bits Systems achieve partial look-ahead performance with the economy of ripple carry Typical add times Two 8-bit words 25 ns Two 16-bit words 45 ns Typical power dissipation per 4-bit adder 95 mW Alt
18	DM74LS247	National Semiconductor	BCD to 7-Segment Decoder/Driver M115 Printed in U S A Absolute Maximum Ratings (Note) Supply Voltage 7V Input Voltage 7V Operating Free Air Temperature Range 0 C to a70 C Storage Temperature Range b65 C to a150 C Recommended Operating Conditions Symbol VCC VIH VIL IOH IO
19	DM74LS22	National Semiconductor	Dual 4-Input NAND Gates
20	DM74LS273	National Semiconductor	8-BIT REGISTER