Texas Instruments JM38510-38301BRA, JM38510-38301B2A, SN54ALS240AJ, SN74ALS240A-1DW, SN74ALS240A-1DWR Datasheet

SN54ALS240A, SN54AS240A, SN74ALS240A, SN74AS240A

OCTAL BUFFERS/DRIVERS

WITH 3-STATE OUTPUTS

	SDAS214C ± DECEMBER 1982 ± REVISED AUGUST 1995
• 3-State Outputs Drive Bus Lines or Buffer	SN54ALS240A, SN54AS240A . . . J PACKAGE
Memory Address Registers	SN74ALS240A, SN74AS240A . . . DW OR N PACKAGE

• pnp Inputs Reduce dc Loading

(TOP VIEW)

• Package Options Include Plastic

1OE

1

20

VCC

Small-Outline (DW) Packages, Ceramic

1A1

2

19

2OE

Chip Carriers (FK), and Standard Plastic (N)

2Y4

3

18

1Y1

and Ceramic (J) 300-mil DIPs

1A2

4

17

2A4

description

2Y3

5

16

1Y2

1A3

6

15

2A3

These

octal

buffers/drivers

are

designed

2Y2

7

14

1Y3

1A4

8

13

2A2

specifically to improve both the performance and

2Y1

9

12

1Y4

density of 3-state memory address drivers, clock

GND

10

11

2A1

drivers, and bus-oriented receivers and

transmitters. When these devices are used with

the ′ALS241, ′AS241A, ′ALS244, and ′AS244A,

SN54ALS240A, SN54AS240A . . . FK PACKAGE

the circuit designer has a choice of selected

(TOP VIEW)

combinations

of

inverting

and

noninverting

2Y4

1A1

1OE

CC

2OE

outputs, symmetrical active-low output-enable

V

(OE) inputs, and complementary OE and OE

3

2

1

20 19

inputs. These devices feature high fan-out and

1A2

1Y1

4

18

improved fan-in.

2Y3

5

17

2A4

The -1 version of SN74ALS240A is identical to the

1A3

6

16

1Y2

2Y2

7

15

2A3

standard version, except that the recommended

maximum IOL for the -1 version is 48 mA. There is

1A4

8

14

1Y3

9

10 11 12 13

no -1 version of the SN54ALS240A.

2Y1

GND

2A1

1Y4

2A2

The SN54ALS240A and SN54AS240A are

characterized for operation over the full military

temperature range of ±55°C to 125°C. The

SN74ALS240A

and

SN74AS240A

are

characterized for operation from 0°C to 70°C.

FUNCTION TABLE (each buffer)

	INPUTS		OUTPUT
		A	Y
	OE
	L	H	L
	L	L	H
	H	X	Z

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 1995, Texas Instruments Incorporated

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

1

SN54ALS240A, SN54AS240A, SN74ALS240A, SN74AS240A

OCTAL BUFFERS/DRIVERS

WITH 3-STATE OUTPUTS

SDAS214C ± DECEMBER 1982 ± REVISED AUGUST 1995

	logic symbol²		logic diagram (positive logic)
	1		1OE	1
		EN
	1OE
	2	18	1A1	2	18
	1A1	1Y1			1Y1
	4	16
	1A2	1Y2
	6	14		4	16
	1A3	1Y3	1A2
					1Y2
	8	12
	1A4	1Y4
			1A3	6	14
					1Y3
	19	EN
	2OE				12
			1A4	8
	11	9			1Y4
	2A1	2Y1
	13	7
	2A2	2Y2		19
	15	5	2OE
	2A3	2Y3
	17	3
	2A4	2Y4
			2A1	11	9
	² This symbol is in accordance with ANSI/IEEE Std 91-1984				2Y1
	and IEC Publication 617-12.
				13	7
			2A2		2Y2
			2A3	15	5
					2Y3
			2A4	17	3
					2Y4

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)³

Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . . 7	V
Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . . . 7	V
Voltage applied to a disabled 3-state output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . . . . . . . 5.5	V
Operating free-air temperature range, TA: SN54ALS240A . . . . . . . . . . . . . . . . . . . . . . . . . . .	±55°C to 125°C
SN74ALS240A . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	. . 0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	±65°C to 150°C

³Stresses 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.

2	POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

SN54ALS240A, SN54AS240A, SN74ALS240A, SN74AS240A

OCTAL BUFFERS/DRIVERS

WITH 3-STATE OUTPUTS

SDAS214C ± DECEMBER 1982 ± REVISED AUGUST 1995

recommended operating conditions

				SN54ALS240A			SN74ALS240A			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					± 12			± 15	mA
IOL	Low-level output current					12			24	mA
									48²
TA	Operating free-air temperature			± 55		125	0		70	°C
² Applies only to the -1 version and only if V		CC	is between 4.75 V and 5.25 V

electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)

PARAMETER

TEST CONDITIONS

SN54ALS240A

SN74ALS240A

UNIT

MIN

TYP³

MAX

MIN

TYP³

MAX

VIK

VCC = 4.5 V,

II = ± 18 mA

± 1.2

± 1.2

V

VCC = 4.5 V to 5.5 V,

IOH = ± 0.4 mA

VCC ± 2

VCC ± 2

VOH

IOH = ± 3 mA

2.4

3.2

2.4

3.2

V

VCC = 4.5 V

IOH = ± 12 mA

2

IOH = ± 15 mA

2

IOL = 12 mA

0.25

0.4

0.25

0.4

VOL

VCC = 4.5 V

IOL = 24 mA

0.35

0.5

V

IOL = 48 mA²

0.35

0.5

IOZH

VCC = 5.5 V,

VO = 2.7 V

20

20

μA

IOZL

VCC = 5.5 V,

VO = 0.4 V

± 20

± 20

μA

II

VCC = 5.5 V,

VI = 7 V

0.1

0.1

mA

IIH

VCC = 5.5 V,

VI = 2.7 V

20

20

μA

IIL

VCC = 5.5 V,

VI = 0.4 V

± 0.1

± 0.1

mA

I §

V

= 5.5 V,

V = 2.25 V

± 20

± 112

± 30

± 112

mA

O

CC

O

Outputs high

4

11

4

11

ICC

VCC = 5.5 V

mA

Outputs low

13

23

13

23

Outputs disabled

14

25

14

25

² Applies only to the -1 version and only if V

CC

is between 4.75 V and 5.25 V

³ All typical values are at V

CC

= 5 V, T = 25°C.

A

§ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.

POST OFFICE BOX 655303 •DALLAS, TEXAS 75265

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