Integrated Circuits

74148
8-to-3 line priority encoder
PDF datasheet
       
4 1  • 16 Vcc
5 2 15 EO
6 3 14 GS
7 4 13 3
EI 5 12 2
A2 6 11 1
A1 7 10 0
GND 8 9 A0
       
Pin Symbol Description
1 4 decimal data input (active low)
2 5 decimal data input (active low)
3 6 decimal data input (active low)
4 7 decimal data input (active low)
5 EI enable input (active low)
6 A2 binary address output (active low)
7 A1 BCD address output (active low)
8 GND ground
9 A0 binary address output (active low)
10 0 decimal data input (active low)
11 1 decimal data input (active low)
12 2 decimal data input (active low)
13 3 decimal data input (active low)
14 GS goes low when EI is low and any input is low
15 EO goes high when EI is low and any input is low (EO = GS )
16 Vcc supply voltage


Specifications
(typical values under recommended operating conditions, unless specified)
Parameter Value Unit
Propagation delay, n to An 16 (74HC) ns

Notes
  • When two or more inputs are simultaneously active, the input with the highest priority is represented on the output.
  • Input 7 has the highest priority.
  • When all eight data inputs are high, all three outputs are high.
  • Multiple 74148s can be cascaded by connecting EO of the high priority chip to EI of the low priority chip (see datasheet).

Note
Data is maintained by an independent source and accuracy is not guaranteed. Check with the manufacturer's datasheet for up-to-date information.

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