SN74ALS155 DUAL 2-LINE TO 4-LINE DECODER/DEMULTIPLEXER SDAS140 — NOVEMBER 1987 • • • D or N Package (Top View) Applications: Dual 2-Line to 4-Line Decoder Dual 1-Line to 4-Line Demultiplexer 3-Line to 8-Line Decoder 1-Line to 8-Line Demultiplexer 1C 1G B 1Y3 1Y2 1Y1 1Y0 GND Individual Strobes Simplify Cascading For Decoding or Demultiplexing Larger Words Package Options Include Plastic “Small Outline” Packages and Standard Plastic 300-mil DIPs 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC 2C 2G A 2Y3 2Y2 2Y1 2Y0 description The ′ALS155 circuits feature dual 1-line to 4-line demultiplexers with individual strobes and common binary-address inputs in a single 16-pin package. When both sections are enabled, the common binary-address inputs sequentially select and route associated input data to the appropriate output of each section. The individual strobes permit enabling or disabling each of the 4-bit sections as desired. Data applied to input 1C is inverted at its outputs and data applied at input 2C is not inverted through its outputs. The inverter following the 1C data input permits use of the ′ALS155 as a 3-line to 8-line demultiplexer without external gating. All inputs are clamped with high-performance Schottky diodes to suppress line ringing and simplify system design. The SN74ALS155 is characterized for operation from 0°C to 70°C. logic diagram (positive logic) STROBE 2 1G DATA 1 1C SELECT 3 B 7 OUTPUT 1Y0 6 OUTPUT 1Y1 5 OUTPUT 1Y2 4 OUTPUT 1Y3 SELECT 13 A 9 OUTPUT 2Y0 10 OUTPUT 2Y1 DATA 15 2C STROBE 14 1G 11 OUTPUT 2Y2 12 OUTPUT 2Y3 Copyright 1987, Texas Instruments Incorporated 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 SN74ALS155 DUAL 2-LINE TO 4-LINE DECODER/DEMULTIPLEXER SDAS140 — NOVEMBER 1987 logic symbols† (alternatives) FUNCTION TABLE 2-LINE TO 4-LINE DECODER OR 2-LINE TO 4-LINE DECODER 1-LINE TO 4-LINE DEMULTIPLEXER X/Y 1G 1C A B 2G 2C & 2 EN α 1 13 3 1 14 0α 1α 2α 3α 0β 2 & EN β 15 7 1Y0 6 1Y1 5 1Y2 4 1Y3 1β 2β 3β INPUTS SELECT 9 2Y0 10 2Y1 11 2Y2 12 2Y3 1-LINE TO 4-LINE DEMULTIPLEXER A B 13 3 0 G0 3 1 1C 2G 2C 2 A 1Y0 1Y1 1Y2 1Y3 X L H H L L X H H H L H H H L H H H H H H H H X L H X L L X H H L H H H H H H L H H H L H INPUTS G4 1 B X L L SELECT DMUX 1G 4 0 1 2 3 14 15 7 6 5 4 9 10 11 12 1Y0 1Y1 1Y2 1Y3 2Y0 2Y1 2Y2 2Y3 X/Y A B C G 3 1 0 1 2 3 4 5 6 7 1 2 15 2 4 14 EN B A 2Y0 2Y1 2Y2 2Y3 X L L X L H H L L X L L H L H H H L H H H H H H H H X L H X L L X L L H H H H H H H L H H H L H A B C G 13 3 0 G0 7 1 15 2 14 2 9 10 11 12 7 6 5 4 2Y0 2Y1 2Y2 2Y3 1Y0 1Y1 1Y2 1Y3 0 1 2 3 9 2Y0 10 2Y1 11 2Y2 12 2Y3 4 5 6 7 7 1Y0 6 1Y1 5 1Y2 4 1Y3 1-LINE TO 8-LINE DEMULTIPLEXER INPUTS OUTPUTS C‡ B A STROBE OR DATA G§ X L L X L L X L H H L L H L H H H L H H H H H H H H H H H H H H H H H H L L H H H H L L L H L H L L L L H H H H H H H H L H H H H L H H H H L H H H H L H H H H H H H H H H H H L H L L H H H H H H H H H H H H L H H L SELECT (0) (1) POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 (2) (3) (4) (5) (6) (7) 2Y0 2Y1 2Y2 2Y3 1Y0 1Y1 1Y2 1Y3 ‡ C = inputs 1C and 2C connected together § G = inputs 1G and 2G connected together † These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. 2 DATA 2C FUNCTION TABLE 3-LINE TO 8-LINE DECODER OR 1-LINE TO 8-LINE DEMULTIPLEXER DMUX OUTPUTS STROBE 2G 3-LINE TO 8-LINE DECODER 13 OUTPUTS DATA 1C STROBE 1G SN74ALS155 DUAL 2-LINE TO 4-LINE DECODER/DEMULTIPLEXER SDAS140 — NOVEMBER 1987 absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C † Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only, and functional operation of the device at these or any other conditions beyond those indicated in the “Recommended Operating Conditions” section of this specification is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTE 1: All voltage values are with respect to GND. recommended operating conditions VCC VIH Supply voltage VIL IOH Low-level input voltage IOL TA Low-level output current High-level input voltage MIN NOM MAX 4.5 5 5.5 2 V V 0.8 High-level output current Operating free-air temperature UNIT V – 0.4 mA 8 mA 70 °C 0 electrical characteristics over recommended free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS MIN VIK VOH VCC = 4.5 V, VCC = 4.5 V to 5.5 V, II = – 18 mA IOH = – 0.4 mA VOL II VCC = 4.5 V, VCC = 5.5 V, IOL = 8 mA VI = 7 V IIH IL VCC = 5.5 V, VCC = 5.5 V, VI = 2.7 V VI = 0.4 V ICCL VCC = 5.5 V, TYP† MAX UNIT – 1.5 V VCC – 2 V 0.35 0.5 V 0.1 mA 20 µA – 0.1 µA 13 mA 7 † All typical value are at VCC = 5 V, TA = 25°C. switching characteristics over recommended ranges of supply voltage and operating free-air temperature (see Note 2) PARAMETER FROM (INPUT) TO (OUTPUT) tPLH tPHL A, B tPLH tPHL 1C 1Y tPLH tPHL 1G 1Y tPLH tPHL 2C, 2G 1Y, 2Y 2Y VCC = 4.5 V to 5.5 V, CL = 50 pF, RL = 500 Ω, UNIT TA = 0°C to 70°C MIN MAX 3 14 3 12 3 12 3 14 3 12 3 13 3 12 3 14 ns ns ns ns NOTE 2: Load circuits and voltage waveforms are shown in Section 1, ALS/AS Logic Data Book, 1986. 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