SN54ALS28A, SN74ALS28A QUADRUPLE 2-INPUT POSITIVE-NOR BUFFERS SDAS193 – D2661, APRIL 1982 – REVISED MAY 1986 • • Package Options Include Plastic Small Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs Dependable Texas Instruments Quality and Reliability SN54ALS28A . . . J PACKAGE SN74ALS28A . . . D OR N PACKAGE (TOP VIEW) 1Y 1A 1B 2Y 2A 2B GND description These devices contain four independent 2-input NOR buffer gates. They perform the Boolean functions Y = A+B or Y = A•B in positive logic. FUNCTION TABLE (each gate) INPUTS A B Y X L X H L L L H 13 3 12 4 11 5 10 6 9 7 8 (TOP VIEW) 4 3 2 1 20 19 18 5 17 6 16 7 15 8 14 9 10 11 12 13 4B NC 4A NC 3Y 2B GND NC 3A 3B H 2 VCC 4Y 4B 4A 3Y 3B 3A SN54ALS28A . . . FK PACKAGE 1B NC 2Y NC 2A OUTPUT 14 1A 1Y NC VCC 4Y The SN54ALS28A is characterized for operation over the full military temperature range of – 55°C to 125°C. The SN74ALS28A is characterized for operation from 0°C to 70°C. 1 logic symbol† NC – No internal connection 1A 1B 2A 2B 3A 3B 4A 4B 2 ≥1 1 1Y 3 5 4 logic diagram (positive logic) 1A 2Y 6 1Y 1B 8 10 9 3Y 2A 12 2Y 2B 11 13 4Y 3A 3Y 3B † This symbol is in accordance with ANSI/IEEE Std –1984 and IEC Publication 617-12. Pin numbers shown are for D, J, and N packages. 4A 4Y 4B Copyright 1986, Texas Instruments Incorporated 5BASIC PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 SN54ALS28A, SN74ALS28A QUADRUPLE 2-INPUT POSITIVE-NOR BUFFERS SDAS193 – D2661, APRIL 1982 – REVISED MAY 1986 absolute maximum ratings over operating free-air temperature range (unless otherwise noted) Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Operating free-air temperature range: SN54ALS28A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C SN74ALS28A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C recommended operating conditions SN54ALS28A SN74ALS28A MIN NOM MAX MIN NOM MAX 4.5 5 5.5 4.5 5 5.5 UNIT VCC VIH Supply voltage VIL VOH Low-level input voltage 0.7 0.8 V High-level output current –1 –2.6 mA IOL TA Low-level output current 12 24 mA 70 °C High-level input voltage 2 Operating free-air temperature 2 – 55 125 V V 0 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS VIK VCC = 4.5 V, VCC = 4.5 V to 5.5 V, II = – 18 mA IOH = – 0.4 mA VOH VCC = 4.5 V, VCC = 4.5 V, IOH = – 1 mA IOH = – 2.6 mA VOL VCC = 4.5 V, VCC = 4.5 V, IOL = 12 mA IOL = 24 mA II IIH VCC = 5.5 V, VCC = 5.5 V, VI = 7 V VI = 2.7 V IIL IO‡ VCC = 5.5 V, VCC = 5.5 V, VI = 0.4 V VO = 2.25 V ICCH ICCL VCC = 5.5 V, VCC = 5.5 V, VI = 0 V VI = 4.5 V SN54ALS28A TYP† MAX SN74ALS28A TYP† MAX MIN MIN – 1.5 VCC – 2 2.4 – 1.5 UNIT V VCC – 2 3.3 V 2.4 0.25 – 30 0.4 3.3 0.25 0.4 0.35 0.5 V 0.1 0.1 20 20 µA – 0.1 – 0.1 mA –112 mA mA – 112 – 30 1.7 2.8 1.7 2.8 5.6 9 5.6 9 mA mA † All typical values are at VCC = 5 V, TA = 25°C. ‡ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS. switching characteristics (see Note 1) VCC = 5 V, CL = 50 pF, PARAMETER tPLH tPHL RL = 500 Ω, RL = 500 Ω, TA = MIN to MAX SN54ALS28A SN74ALS28A FROM TO (INPUT) (OUTPUT) TYP MIN MAX MIN MAX A or B Y 4 1 16 2 8 A or B Y 4 1 10 2 7 TA = 25°C ’ALS28A NOTE 1: Load circuit and voltage waveforms are shown in Section 1. 2 VCC = 4.5 V to 5.5 V, CL = 50 pF, POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 UNIT IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. 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