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MC74LCX258MEL Datasheet(PDF) 2 Page - ON Semiconductor |
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MC74LCX258MEL Datasheet(HTML) 2 Page - ON Semiconductor |
2 / 10 page MC74LCX258 http://onsemi.com 2 Figure 1. Pinout: 16−Lead Plastic Package (Top View) 15 16 14 13 12 11 10 2 1 3456 7 VCC 9 8 OE A3 B3 Y3 A2 B2 Y2 S A0 B0 Y0 A1 B1 Y1 GND PIN NAMES Pins Function An Source 0 Data Inputs Bn Source B Data Inputs OE Enable Input S Select Input Yn Outputs TRUTH TABLE Inputs Outputs Output Enable Select Y0−Y3 H X Z L L A0−A3 L H B0−B3 X = Don’t Care A0−A3, B0−B3 = The levels of the respective Data−Word Inputs PIN DESCRIPTIONS INPUTS A0−A3 (Pins 2, 5, 11, 14) Nibble A inputs. The data present on these pins is transferred to the outputs when the Select input is at a low level and the Output Enable input is at a low level. The data is presented to the outputs in inverted form for the LCX258. B0−B3 (Pins 3, 6, 10, 13) Nibble B inputs. The data present on these pins is transferred to the outputs when the Select input is at a high level and the Output Enable input is at a low level. The data is presented to the outputs in inverted form for the LCX258. OUTPUTS Y0−Y3 (Pins 4, 7, 9, 12) Data outputs. The selected input nibble is presented at these outputs when the Output Enable input is at a low level. The data present on these pins is in its inverted form for the LCX258. For the Output Enable input at a high level, the outputs are at a high level for the LCX258. Select (Pin 1) Nibble select. This input determines the data word to be transferred to the outputs. A low level on this input selects the A inputs and a high level selects the B inputs. CONTROL INPUTS Output Enable (Pin 15) Output Enable input. A low level on this input allows the selected data to be presented at the outputs. A high level on this input sets all of the outputs to 3−state off. |
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