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Moteur de recherche de fiches techniques de composants électroniques |
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M54HC257 Fiches technique(PDF) 1 Page - STMicroelectronics |
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M54HC257 Fiches technique(HTML) 1 Page - STMicroelectronics |
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1 / 12 page  M54/M74HC257 M54/M74HC258 October 1992 HC258 QUAD 2 CHANNEL MULTIPLEXER (3-STATE, INVERTING) HC257 QUAD 2 CHANNEL MULTIPLEXER (3-STATE) B1R (Plastic Package) ORDER CODES : M54HCXXXF1R M74HCXXXM1R M74HCXXXB1R M74HCXXXC1R F1R (Ceramic Package) M1R (Micro Package) C1R (Chip Carrier) PIN CONNECTIONS (top view) . 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 15 LSTTL LOADS . SYMMETRICAL OUTPUT IMPEDANCE IOH =IOL = 6 mA (MIN.) . BALANCED PROPAGATION DELAYS tPLH =tPHL . WIDE OPERATING VOLTAGE RANGE VCC (OPR) = 2 V to 6 V . PIN AND FUNCTION COMPATIBLE WITH 54/74LS257/258 DESCRIPTION The M54/74HC257 and the M54/74HC258 are high speed CMOS MULTIPLEXERs fabricated with sili- con gate C 2MOS technology. They have the same high speed performance of LSTTL combined with true CMOS low power con- sumption. These IC’s are composed of an independent 2- channel multiplexer with common SELECT and EN- ABLE INPUT. The M54/74HC258 is an inverting multiplexer while the M54/74HC257 is a non-inverting multiplexer. When the ENABLE INPUT is held ”High”, outputs of both IC’s become high-impedance state. If SELECT INPUT is held ”Low”, ”A” data is selected, when SE- LECT INPUT is high ”H”, ”B” data is chosen. All inputs are equipped with protection circuits against static discharge and transient excess volt- age. HC257 HC258 1/12 |
Numéro de pièce similaire - M54HC257 |
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Description similaire - M54HC257 |
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