74644 Octal O.C. Bus Transceiver (invert/non-invert)

Pin Arrangement

DIR = L : B A (Non-Inverted OC)
DIR = H : A B (Inverted OC)

Electrical Characteristics

Propagation Delay

Input	Output	N	LS	ALS	ALS 1000	F	S	AS	AS 1000	HC	HCT	Unit [max]
Data	Inverted	-	25	35	24	-	-	21	-	-	-	nS
	Non-Inverted	-	25	35	27	-	-	24	-	-	-	nS
G'	Inverted	-	60	30	30	-	-	22	-	-	-	nS
	Non-Inverted	-	50	30	30	-	-	21	-	-	-	nS




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
OC	High	-	100	100	100	-	-	100	-	-	-	uA
	Low	-	24	24	16	-	-	64	-	-	-	mA

Reference

74LS644-1, 74ALS644-1 : I_OL = 48mA
74ALS1644-1 : 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