Datasheet 74als245a DATASHEETS (Philips)

INTEGRATED CIRCUITS

74ALS245A/74ALS245A–1

Octal transceiver (3–State)

Product specification IC05 Data Handbook

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1991 Jun 03

Philips Semiconductors Product specification

74ALS245A/74ALS245A-1Octal transceiver (3-State)

FEA TURES

•Octal bidirectional bus interface

•3-State buffer outputs sink 24mA and source 15mA

•Outputs are placed in high impedance state during power-off

conditions

•The -1 version sinks 48mA

DESCRIPTION

The 74ALS245A is an octal transceiver featuring non-inverting 3-State bus compatible outputs in both transmit and receive directions. The device features an output enable (OE cascading and transmit/receive (R/T

) input for direction control.

The 74ALS245A-1 is the same as the 74ALS245A except that both ports sink 48mA within the ±5% V

CC

range.

TYPICAL

TYPE

PROPAGATION

DELA Y

74ALS245A 7.0ns 34mA

74ALS245A-1 7.0ns 34mA

) input for easy

TYPICAL

SUPPLY CURRENT

(TOTAL)

PIN CONFIGURATION

1

T/R

2

A0

3

A1

4

A2

5

A3

6

A4

7

A5

8

A6

9

A7

10 11

GND

ORDERING INFORMA TION

ORDER CODE

DESCRIPTION

20-pin plastic DIP

20-pin plastic SOL

20-pin plastic SSOP

Type II

COMMERCIAL RANGE

V

CC

T

= 0°C to +70°C

amb

74ALS245AN,

74ALS245A-1N

74ALS245AD,

744ALS245A-1D

74ALS245ADB,

74ALS245A-1DB

V

20 19

OE

18

B0

17

B1

16

B2

15

B3

14

B4

13

B5

12

B6 B7

= 5V ±10%,

CC

SF00198

DRAWING

NUMBER

SOT146-1

SOT163-1

SOT339-1

INPUT AND OUTPUT LOADING AND FAN-OUT TABLE

PINS DESCRIPTION

74ALS (U.L.)

HIGH/LOW

A0 – A7, B0 – B7 Data inputs 1.0/1.0 20µA/0.1mA

OE Output Enable input (active-Low) 1.0/1.0 20µA/0.1mA

T/R Transmit/receive input 1.0/1.0 20µA/0.1mA A0 – A7 A port outputs 750/240 15mA/24mA B0 – B7 B port outputs 750/240 15mA/24mA A0 – A7 A port outputs (-1 version) 750/480 15mA/48mA B0 – B7 B port outputs (-1 version) 750/480 15mA/48mA

NOTE: One (1.0) ALS unit load is defined as: 20µA in the High state and 0.1mA in the Low state.

LOAD VALUE

HIGH/LOW

1991 Jun 03 853–001 1 02709

2

Philips Semiconductors Product specification

OUTPUTS

74ALS245A/74ALS245A-1Octal transceiver (3-State)

LOGIC SYMBOL

234

A0 A1 A2 A3 A4 A5

19

1

V

= Pin 20

CC

GND = Pin 10

OE T/R

B0

18

LOGIC DIAGRAM

19

OE

1

T/R

VCC = Pin 20 GND = Pin 10

B2 B3 B4 B5

B1

16 15 14 13

17

567

IEC/IEEE SYMBOL

89

A6 A7

B6 B7

12 11

SF00199

A0 A1 A2 A3 A4 A5 A6 A7

23456789

18

B0

17

B1

16

B2

15

B3

19

1

2 3 4 5 6 7 8 9

14

B4

G3 3EN1 [BA] 3EN2 [AB]

∇ 1

13

B5

2 ∇

12

B6

18 17 16 15 14 13 12 11

11

B7

SC00097

SF00201

FUNCTION TABLE

INPUTS

OE T/R

L L Bus B data to Bus A L H Bus A data to Bus B

H X Z

H = High voltage level L = Low voltage level X = Don’t care Z = High impedance “off” state

1991 Jun 03

3

Philips Semiconductors Product specification

I

Current applied to output in Low output state

SYMBOL

UNIT

IOLLow-level output current

74ALS245A/74ALS245A-1Octal transceiver (3-State)

ABSOLUTE MAXIMUM RATINGS

(Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the operating free air temperature range.)

SYMBOL

V

T

V

I

OUT

amb

T

CC

IN

stg

Supply voltage –0.5 to +7.0 V Input voltage –0.5 to +7.0 V

IN

Input current –30 to +5 mA Voltage applied to output in High output state –0.5 to V

pp

p

Operating free-air temperature range 0 to +70 °C Storage temperature range –65 to +150 °C

RECOMMENDED OPERATING CONDITIONS

V

CC

V V

I

IK

I

OH

T

amb

NOTES:

1. The 48mA limit applies only under the condition of V

Supply voltage 4.5 5.0 5.5 V High-level input voltage 2.0 V

IH

Low-level input voltage 0.8 V

IL

Input clamp current –18 mA High-level output current –15 mA

p

Operating free-air temperature range

PARAMETER RATING UNIT

CC

p

All versions 48 mA

-1 version 96 mA

V

LIMITS

PARAMETER

MIN NOM MAX

All versions 24 mA

-1 version 48

1

mA

0 +70 °C

= 5.0V ± 5%.

CC

1991 Jun 03

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Philips Semiconductors Product specification

SYMBOL

PARAMETER

TEST CONDITIONS

1

UNIT

CC

,

IL

,

VOHHigh level out ut voltage

All versions

CC

,

IL

,

VOLLow level out ut voltage

I

74ALS245A/74ALS245A-1Octal transceiver (3-State)

DC ELECTRICAL CHARACTERISTICS

(Over recommended operating free-air temperature range unless otherwise noted.)

LIMITS

MIN TYP

VCC±10%, VIL = MAX,

-

p

VIH = MIN VCC = MIN, VIL = MAX,

V

= MIN

IH

VCC = MIN, VIL = MAX,

-

p

-1 version

V

I

IH

I

IL

I

O

I

CC

Input clamp voltage VCC = MIN, II = I

IK

Input current at maxi-

I

mum input voltage High-level input current

Low-level input current Output current

Supply current (total)

4

OE or T/R VCC = MAX, VI = 7.0V 0.1 mA A or B ports VCC = MAX, VI = 5.5V 0.1 mA

3

I

CCH

I

CCL

I

CCZ

VIH = MIN VCC = 4.75V, VIL = MAX,

V

= MIN

IH

IK

VCC = MAX, VI = 2.7V 20 µA VCC = MAX, VI = 0.4V –0.1 mA VCC = MAX, VO = 2.25V –30 –112 mA

VCC = MAX

IOH = –0.4mA V

IOH = –3mA 2.4 3.2 V

IOH = –15mA 2.0 V

I

= 12mA 0.25 0.40 V

OL

I

= 24mA 0.35 0.50 V

OL

I

= 48mA 0.35 0.50 V

OL

– 2 V

CC

NOTES:

1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applic able type.

2. All typical values are at V

3. For I/O ports, the parameter I

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

= 5V, T

CC

IH

= 25°C.

amb

and IIL include the off-state current.

2

MAX

–0.73 –1.5 V

28 45 mA 40 55 mA 44 58 mA

OS

.

AC ELECTRICAL CHARACTERISTICS

SYMBOL PARAMETER TEST CONDITION

t

PLH

t

PHL

t

PZH

t

PZL

t

PHZ

t

PLZ

Propagation delay An to Bn, Bn to An

Output enable time to High or Low level

Output disable time from High or Low level

Waveform 1 Waveform 2

Waveform 3 Waveform 2

Waveform 3

LIMITS

T

= 0°C to +70°C

amb

V

= +5.0V ± 10%

CC

C

= 50pF, RL = 500Ω

L

MIN MAX

2.0

3.0

2.0

4.0

10.0

20.0

10.0

15.0

UNIT

ns

1991 Jun 03

5

Philips Semiconductors Product specification

74ALS245A/74ALS245A-1Octal transceiver (3-State)

AC WAVEFORMS

For all waveforms, VM = 1.3V.

An, Bn

Bn, An

V

M

t

PLH

V

M

t

PHL

V

M

SC00096

Waveform 1. Propagation Delay for Non-inverting Outputs

OE

An, Bn

V

M

t

PZH

V

M

t

PHZ

M

VOH -0.3V

Waveform 2. 3-State Output Enable Time to High Level

and Output Disable Time from High Level

TEST CIRCUIT AND WAVEFORMS

V

CC

PULSE

GENERATOR

V

IN

D.U.T.

V

OUT

R

L

0V

SC00094

7.0V NEGATIVE

PULSE

OE

An, Bn

V

M

t

PZL

V

M

t

PLZ

M

V

OL

Waveform 3. 3-State Output Enable Time to Low Level

and Output Disable Time from Low Level

t

90%

w

V

M

10%

t

)

f

THL (tf

t

TLH (tr

10%

)

90%

V

M

3.5V

+0.3V

SC00095

AMP (V)

0.3V

Test Circuit for 3-State Outputs

SWITCH POSITION

TEST SWITCH

, t

t

PLZ

PZL

All other open

DEFINITIONS:

R

= Load resistor;

L

see AC electrical characteristics for value.

= Load capacitance includes jig and probe capacitance;

C

L

see AC electrical characteristics for value.

R

= Termination resistance should be equal to Z

T

pulse generators.

1991 Jun 03

closed

R

T

C

R

L

POSITIVE PULSE

10%

V

90%

M

t

TLH (tr

)

t

)

THL (tf

90%

V

M

t

w

10%

AMP (V)

0.3V

Input Pulse Definition

INPUT PULSE REQUIREMENTS

V

Rep.Rate

M

3.5V

1.3V

1MHz

t

w

500ns

t

TLHtTHL

2.0ns 2.0ns

SC00072

OUT

Family

Amplitude

74ALS

of

6

Philips Semiconductors Product specification

74ALS245A/74ALS245A–1Octal transceiver (3–State)

DIP20: plastic dual in-line package; 20 leads (300 mil) SOT146-1

1991 Jun 03

7

Philips Semiconductors Product specification

74ALS245A/74ALS245A–1Octal transceiver (3–State)

SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1

1991 Jun 03

8

Philips Semiconductors Product specification

74ALS245A/74ALS245A–1Octal transceiver (3–State)

SSOP20: plastic shrink small outline package; 20 leads; body width 5.3 mm SOT339-1

1991 Jun 03

9

Philips Semiconductors Product specification

74ALS245A/74ALS245A–1Octal transceiver (3–State)

DEFINITIONS

Data Sheet Identification Product Status Definition

Objective Specification

Preliminary Specification

Product Specification

Formative or in Design

Preproduction Product

Full Production

Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification.

LIFE SUPPORT APPLICA TIONS Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices, or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expected

to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale.

Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088–3409 Telephone 800-234-7381

This data sheet contains the design target or goal specifications for product development. Specifications may change in any manner without notice.

This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product.

This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes at any time without notice, in order to improve design and supply the best possible product.

 Copyright Philips Electronics North America Corporation 1997

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1991 Jun 03

10