Texas Instruments SN74ALS244CN Handleiding

Texas Instruments Niet gecategoriseerd SN74ALS244CN

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SN54ALS244C, SN54AS244A, SN74ALS244C, SN74AS244A

OCTAL BUFFERS AND LINE DRIVERS

WITH 3-STATE OUTPUTS

SDAS142C – JULY 1987 – REVISED AUGUST 1995

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

•3-State Outputs Drive Bus Lines or Buer

Memory Address Registers

•pnp Inputs Reduce dc Loading

•Package Options Include Plastic

Small-Outline (DW) Packages, Ceramic

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

and Ceramic (J) 300-mil DIPs

description

These octal buers and line drivers are designed

specically to improve the performance and

density of 3-state memory address drivers, clock

drivers, and bus-oriented receivers and

transmitters. With the ALS240A, ALS241C,′ ′

′AS240A, and ′AS241A, these devices provide the

choice of selected combinations of inverting

outputs, symmetrical active-low output-enable

(OE) inputs, and complementary OE and OE

inputs.

The -1 version of SN74ALS244C is identical to the

standard version, except that the recommended

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

no -1 version of the SN54ALS244C.

The SN54ALS244C and SN54AS244A are

characterized for operation over the full military

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

SN74ALS244C and SN74AS244A are

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

FUNCTION TABLE

(each buer)

INPUTS OUTPUT

OE A Y

L H H

L L L

H X Z

1OE

1A1

2Y4

1A2

2Y3

1A3

2Y2

1A4

2Y1

GND

VCC

2OE

1Y1

2A4

1Y2

2A3

1Y3

2A2

1Y4

2A1

SN54ALS244C, SN54AS244A . . . J PACKAGE

SN74ALS244C, SN74AS244A . . . DW OR N PACKAGE

(TOP VIEW)

3 2 1 20 19

9 10 11 12 13

1Y1

2A4

1Y2

2A3

1Y3

1A2

2Y3

1A3

2Y2

1A4

SN54ALS244C, SN54AS244A . . . FK PACKAGE

(TOP VIEW)

2Y4

1A1

1OE

1Y4

2A2 2OE

2Y1

GND

2A1 V

PRODUCTION DATA information is current as of publication date.

Products conform to specications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

SN54ALS244C, SN54AS244A, SN74ALS244C, SN74AS244A

OCTAL BUFFERS AND LINE DRIVERS

WITH 3-STATE OUTPUTS

SDAS142C – JULY 1987 – REVISED AUGUST 1995

2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic symbol†logic diagram (positive logic)

17 3

1A1

1A2

1A3

1A4

1Y1

2A1

2A2

2A3

2A4

2Y1

1Y2

1Y3

1Y4

2Y2

2Y3

2Y4

2OE

1OE

1A1 4

1A2 6

1A3

1A4

1Y1

1Y2

1Y3

1Y4

2A1 13

2A2 15

2A3

2A4

2Y1

2Y2

2Y3

2Y4

1OE

2OE

†This symbol is in accordance with ANSI/IEEE Std 91-1984 and

IEC Publication 617-12.

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

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: SN54ALS244C –55°C to 125 C°. . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74ALS244C 0°C to 70 C°. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range –65°C to 150 C°. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

‡Stresses beyond those listed under “absolute maximum ratings” 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 “recommended operating conditions” is not

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

SN54ALS244C, SN54AS244A, SN74ALS244C, SN74AS244A

OCTAL BUFFERS AND LINE DRIVERS

WITH 3-STATE OUTPUTS

SDAS142C – JULY 1987 – REVISED AUGUST 1995

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

recommended operating conditions

SN54ALS244C SN74ALS244C

UNIT

MIN NOM MAX MIN NOM MAX

UNIT

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 in

ut voltage

0.8†0.8

inp

oltage

0.7‡

IOH High-level output current – 12 – 15 mA

IOL

Low level out

ut current

12 24

rrent

48§

TAOperating free-air temperature – 55 125 0 70 C°

†Applies over temperature range – 55°C to 70 C°

‡Applies over temperature range 70°C to 125 C°

§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

SN54ALS244C SN74ALS244C

UNIT

PARAMETER

TEST

CONDITIONS

MIN TYP¶MAX MIN TYP¶MAX

UNIT

VIK VCC = 4.5 V, II = –18 mA – 1.5 – 1.5 V

VCC 4 5 V to 5 5 V

IOH = – 0.4 mA VCC – 2 VCC – 2

VOH

CC =

IOH = – 3 mA 2.4 3.2 2.4 3.2

VCC 4 5 V

IOH = – 12 mA 2

CC =

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 mA (-1 version) 0.35 0.5

IOZH VCC = 5.5 V, V

O = 2.7 V 20 20 Aµ

IOZL VCC = 5.5 V, V

O = 0.4 V – 20 – 20 µA

IIVCC = 5.5 V, V

I = 7 V 0.1 0.1 mA

IIH VCC = 5.5 V, V

I = 2.7 V 20 20 Aµ

IIL VCC = 5.5 V, V

I = 0.4 V – 0.1 – 0.1 mA

IO#VCC = 5.5 V, V

O = 2.25 V – 20 – 112 –30 –112 mA

Outputs high 9 18 9 17

ICC VCC = 5.5 V Outputs low 15 25 15 24 mA

Outputs disabled 17 29 17 27

¶All typical values are at V

CC = 5 V, TA = 25 C.°

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

OS.

Product specificaties

Merk:	Texas Instruments
Categorie:	Niet gecategoriseerd
Model:	SN74ALS244CN
Breedte:	26.92 mm
Diepte:	6.6 mm
Hoogte:	4.57 mm
Breedte verpakking:	13.97 mm
Diepte verpakking:	506 mm
Hoogte verpakking:	11.23 mm
Soort:	PDIP-20
Type verpakking:	PDIP
Aantal per verpakking:	20 stuk(s)
Temperatuur bij opslag:	-65 - 150 °C
Bedrijfstemperatuur (T-T):	0 - 70 °C
Aantal pinnen:	20
Breedte (met pennen):	26.92 mm
Diepte (met pennen):	10.92 mm
Hoogte (met pennen):	8.26 mm