SN74ALS20A

SN54ALS20A, SN54AS20, SN74ALS20A, SN74AS20 DUAL 4ĆINPUT POSITIVEĆNAND GATES Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs description These devices contain two independent 4-input positive-NAND gates. They perform the Boolean functions Y = A B C D or Y = A + B + C + D in positive logic. The SN54ALS20A and SN54AS20 are characterized for operation over the full military temperature range of − 55°C to 125°C. The SN74ALS20A and SN74AS20 are characterized for operation from 0°C to 70°C. 1B 1A NC VCC SDAS192B − APRIL 1982 − REVISED DECEMBER 1994 SN54ALS20A, SN54AS20 . . . J PACKAGE SN74ALS20A, SN74AS20 . . . D OR N PACKAGE (TOP VIEW) 1A 1 1B 2 NC 3 1C 4 1D 5 1Y 6 GND 7 14 VCC 13 2D 12 2C 11 NC 10 2B 9 2A 8 2Y SN54ALS20A, SN54AS20 . . . FK PACKAGE (TOP VIEW) 2D FUNCTION TABLE (each gate) INPUTS OUTPUT A B C D Y H H H H L L X X X H X L X X H X X L X H X X X L H 3 2 1 20 19 NC 4 18 2C NC 5 17 NC 1C 6 16 NC NC 7 15 NC 1D 8 14 2B 9 10 11 12 13 2A 2Y NC GND 1Y NC − No internal connection logic symbol† logic diagram (positive logic) 1 1A & 2 1B 4 1C 5 1D 9 2A 10 2B 12 2C 13 2D 6 1Y 8 2Y † This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Pin numbers shown are for the D, J, and N packages. 1A 1 2 1B 1C 4 5 1D 9 2A 10 2B 2C 12 13 2D 6 1Y 8 2Y PRODUCTION DATA information is curren...