491544_DS - HD74HC155 Dual 2-to-4-line...

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HD74HC155 Dual 2-to-4-line Decoders/Demultiplexers Description This circuit features dual 1-line-to-4-line demultiplexer with individual strobes and common binary-address input. When both sections are enabled by the strobes, the common binary-address inputs sequentially select and route associated input data to the appropriate output of each section. The individual strobes permit activating or inhibiting each of the 4-bit sections as desired. Data applied to input 1C is inverted through its outputs. The inverter following the 1C data input permits use as a 3-to-8-line decoder or 1-to-8- line demultiplexer without external gating. Features High Speed Operation: t pd (A or B to Y) = 15 ns typ (C L = 50 pF) High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: V CC = 2 to 6 V Low Input Current: 1 μA max Low Quiescent Supply Current: I CC (static) = 4 μA max (Ta = 25°C) Function Table 2-line-to-4-line Decoder/1-line-to-4-line Demultiplexer Inputs Select Strobe Data Outputs B A 1G 1C 1Y 0 1Y 1 1Y 2 1Y 3 X X HX HHHH L LLHLHHH LH L H H L H H H L L HHHL H H HL HHHHL X X XL HHHH
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HD74HC155 2 Inputs Select Strobe Data Outputs B A 2G 2C 2Y 0 2Y 1 2Y 2 2Y 3 X X HX HHHH L LLLLHHH LH L L H L H H H L L L HHL H H HL L HHHL X X XHHHHH 3-line-to-8-line Decoder/1-line-to-8-line Demultiplexer Inputs Outputs Select Strobe Data 0 1 2 3 4 5 6 7 CBAG 2 Y 0 2Y 1 2Y 2 2Y 3 1Y 0 1Y 1 1Y 2 1Y 3 X X X H HHHHHHHH L L L L L HHHHHHH L L H L HL HHHHHH L H L L HHLHHHHH L H H L HHHL HHHH H L L L HHHHL HHH H L H L HHHHHL HH H H L L HHHHHHL H H H H L HHHHHHHL Notes: 1. C: inputs 1C and 2C connected together 2. G: inputs 1G and 2G connected together 3. X: irrelevant
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HD74HC155 3 Pin Arrangement 1 2 3 4 5 6 7 8 1Y3 1Y2 1Y1 1Y0 GND V CC 2Y3 2Y2 2Y1 2Y0 16 15 14 13 12 11 10 9 (Top view) Select Input A Strobe 2G Data 2C Outputs Data 1C Strobe 1G
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This note was uploaded on 10/27/2008 for the course NNNNNNN nnnnnnn taught by Professor Nnnnnn during the Spring '08 term at Punjab Engineering College.

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491544_DS - HD74HC155 Dual 2-to-4-line...

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