3-to-8-line Decoder/Demultiplexer
HD74HC131
3-to-8-line Decoder/Demultiplexer with Edge-Triggered Address Registers
Description
The HD74HC131 is 3-to-8 li...
Description
HD74HC131
3-to-8-line Decoder/Demultiplexer with Edge-Triggered Address Registers
Description
The HD74HC131 is 3-to-8 linedecoder. It has Address select inputs (A,B,C) and D type register. Address select data store to D type registers, during the positive going transition of the clock pulse. Output control (G 1, G2) are independent of select input and CLK input, and when G1 is low or G2 = High, all outputs is high.
Features
High Speed Operation: tpd (CLK to Y) = 20 ns typ (CL = 50 pF) High Output Current: Fanout of 10 LSTTL Loads Wide Operating Voltage: VCC = 2 V to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
HD74HC131
Function Table
Inputs
Enable
Select
Outputs
CLK G1 G2
C
B
A
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
XX H X X X H H H H H H H H
XL X X X X H H H H H H H H
H L L L L L H H HH H HH
H L L L H HL H HH H HH
H L L H L HH L HH H HH
H L L H H HH H L H H HH
H L HL L HH H HL H HH
H L HL H HH H HH L HH
H L HH L HH H HH H L H
H L HH H HH H HH H HL
LH
L
XX
X
Outputs corresponding to stored address, L; all others H
Pin Arrangement
A1 B2 C3 CLK 4 G2 5 G1 6 Y7 7 GND 8
(Top view)
16 VCC 15 Y0 14 Y1 13 Y2 12 Y3 11 Y4 10 Y5 9 Y6
2
Logic Diagram
A
B
C
CLK G2 G1
HD74HC131
Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
3
HD74HC131
DC Characteristics
Item Input voltage
Output voltage
Input current Quiescent supply current
Ta = 25°C
Ta = –40 to +85°C
Symbol VIH
VCC (V) Min Typ Max Min 2.0 1.5 — — 1.5 4.5 3.15 — — 3.15
Ma...
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