Philips N74ALS241A-1D, N74ALS241A-1DB, N74ALS241A-1N, N74ALS241AD, N74ALS241ADB Datasheet

INTEGRATED CIRCUITS

74ALS241A/74ALS241A±1

Octal buffer (3±state)

Product specification	1991 Feb 08
IC05 Data Handbook

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Philips Semiconductors	Product specification
Octal buffer (3-State)	74ALS241A/74ALS241A-1

FEATURES

•Octal bus interface

•3-State buffer outputs sink 24mA and source 15mA

•The -1 version sinks 48 mA

DESCRIPTION

The 74ALS241A is an octal buffer that is ideal for driving bus lines or buffer memory address registers. The outputs are all capable of sinking 24mA and sourcing up to 15mA, producing very good capacitive drive characteristics. The device features two output enables, OEa and OEb, each controlling four of the 3-State outputs.

The 74ALS241A-1 sinks 48mA IOL if the VCC is limited to 5.0V ±0.25V.

	TYPICAL	TYPICAL
TYPE	PROPAGATION	SUPPLY CURRENT
	DELAY	(TOTAL)
74ALS241A	4.5ns	18mA
74ALS241A-1	4.5ns	18mA

PIN CONFIGURATION

			20	VCC
OEa		1
Ia0		2	19	OEb
Yb0		3	18	Ya0
Ia1		4	17	Ib0
Yb1		5	16	Ya1
Ia2		6	15	Ib1
Yb2		7	14	Ya2
Ia3		8	13	Ib2
Yb3		9	12	Ya3
GND		10	11	Ib3

SF00324

ORDERING INFORMATION

		ORDER CODE
			DRAWING
		COMMERCIAL RANGE
			NUMBER
	DESCRIPTION	VCC = 5V ±10%,
		Tamb = 0°C to +70°C
	20-pin plastic DIP	74ALS241AN,	SOT146-1
		74ALS241A-1N
	20-pin plastic SOL	74ALS241AD,	SOT163-1
		74ALS241A-1D
	20-pin plastic SSOP	74ALS241ADB,	SOT339-1
	Type II	74ALS241A-1DB

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

	PINS																				DESCRIPTION						74ALS (U.L.)								LOAD VALUE
																												HIGH/LOW							HIGH/LOW
	Ian, Ibn										Data inputs																		1.0/1.0						20μA/0.1mA
											Output Enable inputs (active-Low)																		1.0/1.0						20μA/0.1mA
	OEa, OEb
	Yan, Ybn										Data outputs																		750/240						15mA/24mA
	Yan, Ybn										Data outputs (-1 version)																		750/480						15mA/48mA
NOTE: One (1.0) ALS unit load is defined as: 20μA in the High state and 0.1mA in the Low state.
LOGIC SYMBOL																									IEC/IEEE SYMBOL
							2		4		6		8		17		15		13		11							1
																														EN1
																									19
																														EN2
							Ia0		Ia1		Ia2		Ia3		Ib0		Ib1		Ib2		Ib3							2							18
																														2D		1
1							OEa																		4										16
																																			14
19							OEb																		6
																																			12
																												8
							Ya0		Ya1 Ya2				Ya3 Yb0				Yb1 Yb2				Yb3							17				2			3
																												15							5
							18		16		14		12		3		5		7		9							13							7
VCC = Pin 20																									11										9
GND = Pin 10																							SF00325												SF00326

1991 Feb 08

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853±1276 01670

Philips Semiconductors	Product specification
Octal buffer (3-State)	74ALS241A/74ALS241A-1

LOGIC DIAGRAM

Ia0	2	18	Ya0	Ib0	17	3	Yb0
Ia1	4	16	Ya1	Ib1	15	5	Yb1
Ia2	6	14	Ya2	Ib2	13	7	Yb2
Ia3 8		12	Ya3	Ib3	11	9	Yb3
OEa	1			OEb	10

VCC = Pin 20

GND = Pin 10

SF00327

FUNCTION TABLE

				INPUTS						OUTPUTS
				Ia					Ib	Ya	Yb
		OEa				OEb
		L		L		H			L	L	L
		L		H		H			H	H	H
		H		X		L			X	Z	Z
H	=		High voltage level
L	=		Low voltage level
X	=		Don't care
Z	=		High impedance ªoffº state

ABSOLUTE MAXIMUM RATINGS

(Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the operating free air temperature range.)

	SYMBOL	PARAMETER		RATING	UNIT
	VCC	Supply voltage		±0.5 to +7.0	V
	VIN	Input voltage		±0.5 to +7.0	V
	IIN	Input current		±30 to +5	mA
	VOUT	Voltage applied to output in High output state		±0.5 to VCC	V
	IOUT	Current applied to output in Low output state	All versions	48	mA
			-1 version	96	mA
	Tamb	Operating free-air temperature range		0 to +70	°C
	Tstg	Storage temperature range		±65 to +150	°C

RECOMMENDED OPERATING CONDITIONS

SYMBOL	PARAMETER			LIMITS		UNIT
			MIN	NOM	MAX
VCC	Supply voltage		4.5	5.0	5.5	V
VIH	High-level input voltage		2.0			V
VIL	Low-level input voltage				0.8	V
IIK	Input clamp current				±18	mA
IOH	High-level output current				±15	mA
IOL	Low-level output current	All versions			24	mA
		-1 version			48 1	mA
Tamb	Operating free-air temperature range		0		+70	°C

NOTE:

1. The 48mA limit applies only under the condition of VCC = 5.0V ±5%.

1991 Feb 08

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