74148

8-to-3 line priority encoder


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.