MM54HC138/MM74HC1383-to-8 Line DecoderGeneral DescriptionThis decoder utilizes advanced silicon-gate CMOS technology,and is well suited to memory address decoding or datarouting applications. The circuit features high noise immunityand low power consumption usually associated withCMOS circuitry, yet has speeds comparable to low powerSchottky TTL logic.The MM54HC138/MM74HC138 has 3 binary select inputs(A, B, and C). If the device is enabled these inputs determinewhich one of the eight normally high outputs will golow. Two active low and one active high enables (G1, G2Aand G2B) are provided to ease the cascading of decoders.The decoder's outputs can drive 10 low power Schottky TTLequivalent loads, and are functionally and pin equivalent tothe 54LS138/74LS138. All inputs are protected from damagedue to static discharge by diodes to VCC and ground.FeaturesY Typical propagation delay: 20 nsY Wide power supply range: 2V±6VY Low quiescent current: 80 mA maximum (74HC Series)Y Low input current: 1 mA maximumY Fanout of 10 LS-TTL loads
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