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KK74HC138A Datasheet(PDF) 1 Page - KODENSHI_AUK CORP. |
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KK74HC138A Datasheet(HTML) 1 Page - KODENSHI_AUK CORP. |
1 / 6 page TECHNICAL DATA KK74HC138A 1-of-8 Decoder/Demultiplexer ORDERING INFORMATION KK74HC138AN Plastic KK74HC138AD SOIC TA = -55° to 125° C for all packages The KK74HC138A is identical in pinout to the LS/ALS138. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALSTTL outputs. The KK74HC138A decodes a three-bit Address to one-of-eight active- low outputs. This device features three Chip Select inputs, two active-low and one active-high to facilitate the demultiplexing, cascading, and chip- selecting functions. The demultiplexing function is accomplished by using the Address inputs to select the desired device output; one of the Chip Selects is used as a data input while the other Chip Selects are held in their active states. • Outputs Directly Interface to CMOS, NMOS, and TTL • Operating Voltage Range: 2.0 to 6.0 V • Low Input Current: 1.0 µA • High Noise Immunity Characteristic of CMOS Devices PIN ASSIGNMENT LOGIC DIAGRAM PIN 16 =VCC PIN 8 = GND FUNCTION TABLE Inputs Outputs CS1CS2CS3 A2 A1A0 Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7 X X H X H X L X X X X X X X X X X X H H H H H H H H H H H H H H H H H H H H H H H H H L L H L L H L L H L L L L L L L H L H L L H H L H H H H H H H H L H H H H H H H H L H H H H H H H H L H H H H H L L H L L H L L H L L H L L H L H H H L H H H H H H H L H H H H H H H H L H H H H H H H H L H H H H H H H H L H = high level (steady state) L = low level (steady state) X = don’t care 1 |
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