74138 3 to 8 Line Decoder

Pin Arrangement

Truth Table

INPUTS					OUTPUTS
ENABLE		SELECT
G1	G2'	C	B	A	Y0	Y1	Y2	Y3	Y4	Y5	Y6	Y7
X L H H H H H H H H	H X L L L L L L L L	X X L L L L H H H H	X X L L H H L L H H	X X L H L H L H L H	H H L H H H H H H H	H H H L H H H H H H	H H H H L H H H H H	H H H H H L H H H H	H H H H H H L H H H	H H H H H H H L H H	H H H H H H H H L H	H H H H H H H H H L

Electrical Characteristics

Propagation Delay

Input	Output	N	LS	ALS	ALS 1000	F	S	AS	AS 1000	HC	HCT	Unit [max]
Enable	Y0 - Y7	-	38	17	-	9	11	5.8	-	44	43	nS
Select		-	41	22	-	9	12	6.1	-	50	50	nS




Input Characteristics

		N	LS	ALS	ALS 1000	F	S	AS	AS 1000	Unit
All inputs	High	-	20	20	-	20	50	-	-	uA
	Low	-	0.36	0.1	-	0.6	2	-	-	mA




Output Characteristics

		N	LS	ALS	ALS 1000	F	S	AS	AS 1000	HC	HCT	Unit
All outputs	High	-	0.4	0.4	-	1	1	2	-	4	4	mA
	Low	-	8	8	-	20	20	20	-	4	4	mA

Reference

74139, 74154.