74638 Octal O.C./3-state Bus Transceiver (inverted)

Pin Arrangement

B A (DIR = L) : O.C
A B (DIR = H) : Tri-State

Electrical Characteristics

Propagation Delay

Input	Output	N	LS	ALS	ALS 1000	F	S	AS	AS 1000	HC	HCT	Unit [max]
A	B	-	15	12	21	-	-	7	-	-	-	nS
B	A (OC)	-	25	30	8	-	-	20	-	-	-	nS
G'	A (OC)	-	60	45	23	-	-	19	-	-	-	nS
	B	-	40	22	15	-	-	10	-	-	-	nS
VOH of OC = 5.5V [max]




Input Characteristics

		N	LS	ALS	ALS 1000	F	S	AS	AS 1000	Unit
A,B	High	-	20	20	20	-	-	50	-	uA
	Low	-	0.4	0.1	0.1	-	-	0.75	-	mA
G',DIR	High	-	20	20	20	-	-	20	-	uA
	Low	-	0.4	0.1	0.1	-	-	0.5	-	mA




Output Characteristics

		N	LS	ALS	ALS 1000	F	S	AS	AS 1000	HC	HCT	Unit
3S	High	-	15	15	15	-	-	15	-	-	-	mA
	Low	-	24	24	16	-	-	64	-	-	-	mA
	High@High-Z	-	400	-	-	-	-	-	-	-	-	uA
	Low@High-Z	-	20	-	-	-	-	-	-	-	-	uA
OC	High@High-Z	-	100	100	100	-	-	100	-	-	-	uA
	Low@High-Z	-	24	24	16	-	-	64	-	-	-	mA

Reference

74ALS638-1 : I_OL = 48mA
74ALS1638-1 : I_OL = 24mA


IC #	Logic	Output Type	Comment
74LS638	Inverted	OC / Tri-State	.
74LS639	Non-Inverted	OC / Tri-State	.
74LS640	Inverted	Tri-State	.
74LS641	Non-Inverted	OC	.
74LS642	Inverted	OC	.
74LS643	Inverted / Non-Inverted	Tri-State	.
74LS644	Inverter / Non-Inverted	OC	.
74LS645	Non-Inverted	Tri-State	= 74LS245