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M74HC258C1R Datasheet(PDF) 1 Page - STMicroelectronics |
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M74HC258C1R Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 11 page  M54HC157/158 M74HC157/158 February 1993 HC158 QUAD 2 CHANNEL MULTIPLEXER (INV.) HC157 QUAD 2 CHANNEL MULTIPLEXER B1R (Plastic Package) ORDER CODES : M54HCXXXF1R M74HCXXXM1R M74HCXXXB1R M74HCXXXC1R F1R (Ceramic Package) M1R (Micro Package) C1R (Chip Carrier) PIN CONNECTIONS (top view) NC = No Internal Connection HC158 HC157 DESCRIPTION . HIGH SPEED tPD = 10 ns (TYP.) AT VCC =5 V . LOW POWER DISSIPATION ICC =4 µA (MAX.) AT TA =25 °C . HIGH NOISE IMMUNITY VNIH =VNIL =28 % VCC (MIN.) . OUTPUT DRIVE CAPABILITY 10 LSTTL LOADS . SYMMETRICAL OUTPUT IMPEDANCE IOH =IOL = 4 mA (MIN.) . BALANCED PROPAGATION DELAYS tPLH =tPHL . WIDE OPERATING VOLTAGE RANGE VCC (OPR) = 2 V TO 6 V . PIN AND FUNCTION COMPATIBLE WITH 54/74LS157/158 The M54/74HC157 and the M54/74HC158 are high speed CMOS QUAD 2-CHANNEL MULTI- PLEXER’s fabricated with silicon gate C 2MOS tech- nology. They achieve the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. These devices consist of four 2-input digital multi- plexers with common select and strobe inputs. The HC158 is an inverting multiplexer while the HC157 is a non-inverting multiplexer. When the STROBE input is held High, selection of data is inhibited and all the outputs become Low in the M74HC157 and High in the M74HC158. The SELECT decoding determines whether the A or B inputs get routed to their corresponding Y outputs. All inputs are equipped with protection circuits against static dis- charge and transient excess voltage. 1/11 |
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