Texas Instruments SN54ALS257AJ, SN74ALS257AD, SN74ALS257ADR, SN74ALS257AN, SN74ALS258AD Datasheet

SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS

SDAS124C ± APRIL 1982 ± REVISED AUGUST 1996

D3-State Outputs Interface Directly With System Bus

DProvide Bus Interface From Multiple Sources in High-Performance Systems

DPackage Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs

description

These data selectors/multiplexers are designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems. The 3-state outputs do not load the data lines when the

output-enable (OE) input is at a high logic level.

SN54ALS257A, SN54ALS258A . . . J PACKAGE SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 . . . D OR N PACKAGE

			(TOP VIEW)
								VCC
	A/B			1	16
	1A			2	15			OE
	1B			3	14			4A
	1Y			4	13			4B
	2A			5	12			4Y
	2B			6	11			3A
	2Y			7	10			3B
GND				8	9			3Y

SN54ALS257A, SN54ALS258A . . . FK PACKAGE

(TOP VIEW)

The SN54ALS257A and SN54ALS258A are characterized for operation over the full military temperature range of ±55°C to 125°C. The SN74ALS257A, SN74ALS258A, SN74AS257, and SN74AS258 are characterized for operation from 0°C to 70°C.

	1A	A/B	NC	CC	OE
				V
1B	3	2	1	20 19		4A
	4				18
1Y	5				17	4B
NC	6				16	NC
2A	7				15	4Y
2B	8				14	3A
	9 10 11 12 13
	2Y	GND	NC	3Y	3B

NC ± No internal connection

FUNCTION TABLE

			INPUTS				OUTPUT Y
					DATA		SN54ALS257A	SN54ALS258A
	OE		A	/B			SN74ALS257A	SN74ALS258A
					A	B
							SN74AS257	SN74AS258
	H		X		X	X	Z	Z
	L		L		L	X	L	H
	L		L		H	X	H	L
	L		H		X	L	L	H
	L		H		X	H	H	L

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

Copyright 1996, Texas Instruments Incorporated

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

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SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS

WITH 3-STATE OUTPUTS

SDAS124C ± APRIL 1982 ± REVISED AUGUST 1996

logic symbols²

				SN54ALS257A, SN74ALS257A,															SN54ALS258A, SN74ALS258A,
								SN74AS257														SN74AS258
				15													15
							EN														EN
	OE														OE
				1
		/B					G1							1							G1
A														A		/B
				2										2
	1A			3			1		MUX			4	1Y		1A						1		MUX			4	1Y
														3
	1B					1									1B					1
				5										5
	2A											7			2A											7
				6									2Y	6													2Y
	2B														2B
				11										11
	3A											9			3A											9
				10									3Y	10													3Y
	3B														3B
				14										14
	4A											12			4A											12
				13									4Y	13													4Y
	4B														4B

² These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Pin numbers shown are for the D, J, and N packages.

logic diagrams (positive logic)
SN54ALS257A, SN74ALS257A,
SN74AS257
15
OE
1
A/B
2
1A	4	1Y
3
1B
5
2A	7	2Y
6
2B
11
3A	9	3Y
10
3B
14
4A	12	4Y
13
4B

Pin numbers shown are for the D, J, and N packages.

		SN54ALS258A, SN74ALS258A,
		SN74AS258
	OE	15
	A /B	1
	1A	2
		4	1Y
	1B	3
	2A	5
		7	2Y
	2B	6
	3A	11
		9	3Y
	3B	10
	4A	14
		12	4Y
	4B	13

2	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

SN54ALS257A, SN54ALS258A, SN74ALS257A, SN74ALS258A, SN74AS257, SN74AS258 QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS

SDAS124C ± APRIL 1982 ± REVISED AUGUST 1996

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)²

Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . 7	V
Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . 7	V
Voltage applied to a disabled 3-state output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . 5.5	V
Maximum power dissipation at TA = 55°C (in still air) (see Note 1): D package . . . . . . . . . . .	. . . . . . . . 1.3 W
N package . . . . . . . . . . .	. . . . . . . . 1.1 W
Operating free-air temperature range, TA: SN54ALS257A, SN54ALS258A . . . . . . . . . . . . . .	±55°C to 125°C
SN74ALS257A, SN74ALS258A . . . . . . . . . . . . . . .	. . 0°C to 70°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	±65°C to 150°C

²Stresses beyond those listed under ªabsolute maximum ratingsº may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under ªrecommended operating conditionsº is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: The maximum package power dissipation is calculated using a junction temperature of 150°C and a board trace length of 750 mils, except for the N package, which has a trace length of zero.

recommended operating conditions

		SN54ALS257A			SN74ALS257A
		SN54ALS258A			SN74ALS258A			UNIT
		MIN	NOM	MAX	MIN	NOM	MAX
VCC	Supply voltage	4.5	5	5.5	4.5	5	5.5	V
VIH	High-level input voltage	2			2			V
VIL	Low-level input voltage			0.7			0.8	V
IOH	High-level output current			±1			±2.6	mA
IOL	Low-level output current			12			24	mA
TA	Operating free-air temperature	±55		125	0		70	°C

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

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