Texas Instruments SN74ALS645A-1N Handleiding

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SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDAS278 – JANUARY 1995

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

•Bidirectional Bus Transceivers in

High-Density 20-Pin Packages

•True Logic

•3-State Outputs

•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 bus transceivers are designed for

asynchronous two-way communication between

data buses. These devices transmit data from the

A bus to the B bus or from the B bus to the A bus,

depending on the level at the direction-control

(DIR) input. The output-enable (OE) input can be

used to disable the device so that the buses are

eectively isolated.

The -1 version of the SN74ALS645A is identical

to the standard version, except that the

recommended maximum IOL is increased to

48 mA. There is no -1 version of the

SN54ALS645A.

The SN54ALS645A and SN54AS645 are

characterized for operation over the full military

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

SN74ALS645A and SN74AS645 are

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

FUNCTION TABLE

INPUTS

OPERATION

OE DIR

OPERATION

L L B data to A bus

L H A data to B bus

H X Isolation

DIR

GND

VCC

SN54ALS645A, SN54AS645 . . . J PACKAGE

SN74ALS645A, SN74AS645 . . . DW OR N PACKAGE

(TOP VIEW)

3 2 1 20 19

9 10 11 12 13

SN54ALS645A, SN54AS645 . . . FK PACKAGE

(TOP VIEW)

DIR

B6 OE

GND

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.

SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDAS278 – JANUARY 1995

2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic symbol†logic diagram (positive logic)

A5 6

A6 7

A7 8

A8 9

A2 3

A3 4

A4 5

A1 2

3 EN2 [AB]

3 EN1 [BA]

DIR

A1 B1

182

DIR

To Seven Other Transceivers

†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: All inputs 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

I/O ports 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, TA: SN54ALS645A –55°C to 125 C°. . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74ALS645A 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.

recommended operating conditions

SN54ALS645A SN74ALS645A

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 input voltage 0.7 0.8 V

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 only to the -1 version and only if V

CC is between 4.75 V and 5.25 V

SN54ALS645A, SN54AS645, SN74ALS645A, SN74AS645

OCTAL BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDAS278 – JANUARY 1995

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

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

otherwise noted)

PARAMETER

TEST CONDITIONS

SN54ALS645A SN74ALS645A

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

IOH = – 3 mA 2.4 3.2 2.4 3.2

OH 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 mA‡0.35 0.5

Control inputs

VCC 5 5 V

VI = 7 V 0.1 0.1

IA or B ports

CC =

VI = 5.5 V 0.1 0.1

IIH

Control inputs

VCC 5 5 V

VI2 7 V

20 20

IH A or B ports§

CC =

I =

20 20

IIL

Control inputs

VCC 5 5 V

VI0 4 V

– 0.1 – 0.1

IL A or B ports§

CC =

I =

– 0.1 – 0.1

IO¶VCC = 5.5 V, V

O = 2.25 V – 20 – 112 –30 –112 mA

Outputs high 30 48 30 45

ICC VCC = 5.5 V Outputs low 36 60 36 55 mA

Outputs disabled 38 63 38 58

†All typical values are at V

CC = 5 V, T

A = 25 C.°

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

CC is between 4.75 V and 5.25 V

§For I/O ports, the parameters I

IH and IIL include the o-state output current.

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

OS.

switching characteristics (see Figure 1)

PARAMETER FROM

(INPUT)

(OUTPUT)

VCC = 4.5 V to 5.5 V,

CL = 50 pF,

R1 = 500 Ω

R2 = 500 Ω,

A = MIN to MAX#UNIT

SN54ALS645A SN74ALS645A

MIN MAX MIN MAX

tPLH

A or B

B or A

1 19 3 10

tPHL

1 14 3 10

tPZH

A or B

2 30 5 20

tPZL

2 29 5 20

tPHZ

A or B

2 14 2 10

tPLZ

2 30 4 15

#For conditions shown as MIN or MAX, use the appropriate value specied under recommended operating conditions.

Product specificaties

Merk:	Texas Instruments
Categorie:	Niet gecategoriseerd
Model:	SN74ALS645A-1N
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:	Logic IC
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