器件名称:
74HC155
功能描述:
Dual 2-to-4-line Decoders/Demultiplexers
文件大小:
49.87KB 共9页
简 介:
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-8line demultiplexer without external gating. Features High Speed Operation: tpd (A or B to Y) = 15 ns typ (CL = 50 pF) High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 A max Low Quiescent Supply Current: ICC (static) = 4 A max (Ta = 25°C) Function Table 2-line-to-4-line Decoder/1-line-to-4-line Demultiplexer Inputs Select B X L L H H X A X L H L H X Strobe 1G H L L L L X Data 1C X H H H H L Outputs 1Y0 H L H H H H 1Y1 H H L H H H 1Y2 H H H L H H 1Y3 H H H H L H HD74HC155 Inputs Select B X L L H H X A X L H L H X Strobe 2G H L L L L X Data 2C X L L L L H Outputs 2Y0 H L H H H H 2Y1 H H L H H H 2Y2 H H H L H H 2Y3 H H H H L H 3-line-to-8-line Decoder/1-line-to-8-line Demultiplexer Inputs Select C X L L L L H H H H B X L L H H L L H H A X L H L H L H L H Strobe Data G H L L L L L L L L Outputs 0 2Y0 H L H H H H H H H 1 2Y1 H H L H H……
