Texas Instruments SN54ALS157AJ, SN54ALS158J, SN74ALS157AD, SN74ALS157ADR, SN74ALS157AN Datasheet

SN54ALS157A, SN54ALS158 SN74ALS157A, SN74ALS158, SN74AS157, SN74AS158 QUADRUPLE 1-OF-2 DATA SELECTORS/MULTIPLEXERS

SDAS081C ± APRIL 1982 ± REVISED DECEMBER 1994

•Buffered Inputs and Outputs

•Package 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 contain inverters and drivers to supply full data selection to the four output gates. A separate strobe (G) input is provided. A 4-bit word is selected from one of two sources and is routed to the four outputs. The ′ALS157A and SN74AS157 present true data. The ′ALS158 and SN74AS158 present inverted data to minimize propagation delay time.

SN54ALS157A, SN54ALS158 . . . J PACKAGE

SN74ALS157A, SN74ALS158,

SN74AS157, SN74AS158 . . . D OR N PACKAGE

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

SN54ALS157A, SN54ALS158 . . . FK PACKAGE

(TOP VIEW)

The SN54ALS157A and SN54ALS158 are characterized for operation over the full military temperature range of ±55°C to 125°C. The SN74ALS157A, SN74ALS158, SN74AS157, and SN74AS158 are characterized for operation from 0°C to 70°C.

	1A	A/B	NC	CC	G
				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		′ALS157A	′ALS158
	G	A /B
					A	B	SN74AS157	SN74AS158
	H		X		X	X	L	H
	L		L		L	X	L	H
	L		L		H	X	H	L
	L		H		X	L	L	H
	L		H		X	H	H	L

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 1994, Texas Instruments Incorporated

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

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SN54ALS157A, SN54ALS158

SN74ALS157A, SN74ALS158, SN74AS157, SN74AS158

QUAD 1-OF-2 DATA SELECTORS/MULTIPLEXERS

SDAS081C ± APRIL 1982 ± REVISED DECEMBER 1994

logic symbols²

					′ALS157A, SN74AS157																′ALS158, SN74AS158
					15														15
			G					EN										G					EN
					1			G1									1						G1
	A	/B														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.

2	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

SN54ALS157A, SN54ALS158 SN74ALS157A, SN74ALS158, SN74AS157, SN74AS158 QUAD 1-OF-2 DATA SELECTORS/MULTIPLEXERS

SDAS081C ± APRIL 1982 ± REVISED DECEMBER 1994

logic diagrams (positive logic)

		2	′ALS157A
	1A		1A
			4
	1B	3	1Y
			1B
	2A	5	2A
			7
	2B	6	2Y
			2B
	3A	11	3A
			9
	3B	10	3Y
			3B
	4A	14	4A
			12
	4B	13	4Y
			4B
	G	15	G
		1
	A /B		A /B

	2	SN74AS157
1A			1A
	3	4	1Y
1B			1B
2A	5		2A
	6	7	2Y
2B			2B
3A	11		3A
	10	9	3Y
3B			3B
4A	14		4A
	13	12	4Y
4B			4B
G	15		G
A /B	1		A /B

′ALS158

2
3	4	1Y
5
6	7	2Y
11
10	9	3Y
14
13	12	4Y
15
1

SN74AS158

2
3	4	1Y
5
6	7	2Y
11
10	9	3Y
14
13	12	4Y
15
1

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

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

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