74148 8 to 3 Line Priority Encoder

Pin Arrangement

Truth Table

INPUTS									OUTPUTS
EI	0	1	2	3	4	5	6	7	A2	A1	A0	GS	EO
H L L L L L L L L L	X H X X X X X X X L	X H X X X X X X L H	X H X X X X X L H H	X H X X X X L H H H	X H X X X L H H H H	X H X X L H H H H H	X H X L H H H H H H	X H L H H H H H H H	H H L L L L H H H H	H H L L H H L L H H	H H L H L H L H L H	H H L L L L L L L L	H L H H H H H H H H

Electrical Characteristics

Propagation Delay

Input	Output	N	LS	ALS	ALS 1000	F	S	AS	AS 1000	HC	HCT	Unit [max]
0 - 7	A0 - A2	19	36	-	-	12	-	-	-	-	-	nS
	EO	25	40	-	-	8.5	-	-	-	-	-	nS
	GS	30	55	-	-	10	-	-	-	-	-	nS
EI	A0 - A2	15	25	-	-	9.5	-	-	-	-	-	nS
	EO	30	35	-	-	12	-	-	-	-	-	nS
	GS	15	36	-	-	8.5	-	-	-	-	-	nS




Input Characteristics

		N	LS	ALS	ALS 1000	F	S	AS	AS 1000	Unit
0	H	40	20	-	-	20	-	-	-	uA
	L	1.6	0.4	-	-	0.6	-	-	-	mA
1 - 7	H	80	40	-	-	20	-	-	-	uA
	L	3.2	0.8	-	-	0.6	-	-	-	mA
EI	H	80	20	-	-	20	-	-	-	uA
	L	3.2	0.4	-	-	0.6	-	-	-	mA




Output Characteristics

		N	LS	ALS	ALS 1000	F	S	AS	AS 1000	HC	HCT	Unit
All outputs	H	0.8	0.4	-	-	1	-	-	-	-	-	mA
	L	16	8	-	-	20	-	-	-	-	-	mA

Reference

74348.