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74LVQ138 View Datasheet(PDF) - Fairchild Semiconductor

Part Name
Description
View to exact match
74LVQ138
Fairchild
Fairchild Semiconductor Fairchild
74LVQ138 Datasheet PDF : 6 Pages
1 2 3 4 5 6
Functional Description
The LVQ138 high-speed 1-of-8 decoder/demultiplexer
accepts three binary weighted inputs (A0, A1, A2) and,
when enabled, provides eight mutually exclusive active-
LOW outputs (O0O7). The LVQ138 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 to a 1-of-32 (5 lines to 32 lines)
decoder with just four LVQ138 devices and one inverter
(see Figure 1). The LVQ138 can be used as 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.
Truth Table
Inputs
Outputs
E1 E2 E3 A0 A1 A2 O0 O1 O2 O3 O4 O5 O6 O7
HXX X X X H H H H H H H H
XHX X X X H H H H H H H H
XXL X X X HH HHH HHH
Logic Diagram
Please note that this diagram is provided only for the understanding of logic
operations and should not be used to estimate propagation delays.
LLHL L L L HHHHHHH
LLHH L L H L HHHHHH
LLHL H L HH L HHHHH
LLHHH L HHH L HHHH
LLHL L HHHHH L HHH
LLHH L HHHHHH L HH
LLHL HHHHHHHH L H
LLHHHHHHHHHHH L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
FIGURE 1. Expansion to 1-of-32 Decoding
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