54138DMQB Datasheet



Features, Applications

The is a high-speed 1-of-8 decoder demultiplexer This device is ideally suited for high-speed bipolar memory chip select address decoding The multiple input enables allow parallel expansion a 1-of-24 decoder using just three 'F138 devices a 1-of-32 decoder using four 'F138 devices and one inverter


Demultiplexing capability Multiple input enable for easy expansion Active LOW mutually exclusive outputs Guaranteed 4000V minimum ESD protection

Package Description (0 300 Wide) Molded Dual-In-Line 16-Lead Ceramic Dual-In-Line (0 150 Wide) Molded Small Outline JEDEC (0 300 Wide) Molded Small Outline EIAJ 16-Lead Cerpack 20-Lead Ceramic Leadless Chip Carrier Type C

Note 1 Devices also available in 13 reel Use suffix e SCX and SJX Note 2 Military grade device with environmental and burn-in processing Use suffix e DMQB FMQB and LMQB

TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation

Address Inputs Enable Inputs (Active LOW) Enable Input (Active HIGH) Outputs (Active LOW)

The 'F138 high-speed 1-of-8 decoder demultiplexer accepts three binary weighted inputs A1 A2) and when enabled provides eight mutually exclusive active LOW outputs � O7) The 'F138 features three Enable inputs two active LOW (E1 E2) and one active HIGH (E3) All outputs will be HIGH unless E1 and E2 are LOW and E3 is HIGH This multiple enable function allows easy parallel expansion of the device 1-of-32 (5 lines to 32 lines) decoder with just four 'F138 devices and one inverter (See Figure 1 ) The 'F138 can be used an 8-output demultiplexer by using one of the active LOW Enable inputs as the data input and the other Enable inputs as strobes The Enable inputs which are not used must be permanently tied to their appropriate active HIGH or active LOW state

H e HIGH Voltage Level L e LOW Voltage Level X e Immaterial

Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays



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