Datasheet

   
    
        
SDLS053B − OCTOBER 1976 − REVISED MAY 2004
13
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
01234567EI
EO A0 A1 A2 GS
’148/’LS148
01234567EI
EO A0 A1 A2 GS
’148/LS148
’08/’LS08
01234567 9101112131415
Enable
(active low)
012 3
Encoded Data (active low)
Priority Flag
(active low)
16-Line Data (active low)
01234567EI
EO A0 A1 A2 GS
’148/’LS148
01234567EI
EO A0 A1 A2 GS
’148/’LS148
’HC00
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Enable
(active low)
012 3
Encoded Data (active high)
Priority Flag
(active high)
16-Line Data (active low)
8
Figure 3. Priority Encoder for 16 Bits
Because the ’147/’LS147 and ’148/’LS148 devices are combinational logic circuits, wrong addresses can appear
during input transients. Moreover, for the ’148/’LS148 devices, a change from high to low at EI can cause a transient
low on GS when all inputs are high. This must be considered when strobing the outputs.