SN74ALS243ANSR [TI]

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型号：	SN74ALS243ANSR
厂家：	TEXAS INSTRUMENTS
描述：	暂无描述总线收发器输出元件
文件：	总5页 (文件大小：87K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

SN54ALS243A, SN74ALS243A

QUADRUPLE BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDAS069B – DECEMBER 1982 – REVISED DECEMBER 1994

SN54ALS243A . . . J PACKAGE

SN74ALS243A . . . D OR N PACKAGE

(TOP VIEW)

• Two-Way Asynchronous Communication

Between Data Buses

• pnp Inputs Reduce dc Loading

• Package Options Include Plastic

Small-Outline (D) Packages, Ceramic Chip

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

Ceramic (J) 300-mil DIPs

OEAB

OEBA

description

GND

These quadruple bus transceivers are designed

for asynchronous two-way communication

between data buses. The control-function

implementation allows for maximum flexibility in

timing. These devices allow data transmission

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

A bus depending upon the logic levels at the

output-enable (OEBA and OEAB) inputs. The

output-enable inputs can be used to disable the

device so that the buses are effectively isolated.

SN54ALS243A . . . FK PACKAGE

(TOP VIEW)

20 19

The dual-enable configuration gives the

quadruple bus transceivers the capability to store

data by simultaneously enabling OEBA and

OEAB. Each output reinforces its input in this

transceiver configuration. When both control

inputs are enabled and all other data sources to

the two sets of bus lines are at high impedance,

both sets of bus lines (eight in all) retain their

states. The 4-bit codes appearing on the two sets

of buses are identical.

9 10 11 12 13

NC – No internal connection

The SN54ALS243A is characterized for operation over the full military temperature range of –55°C to 125°C.

The SN74ALS243A is characterized for operation from 0°C to 70°C.

FUNCTION TABLE

INPUTS

FUNCTION

OEBA

OEAB

A to B

B to A

Isolation

Latch A and B

(A = B)

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.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54ALS243A, SN74ALS243A

QUADRUPLE BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDAS069B – DECEMBER 1982 – REVISED DECEMBER 1994

†

logic symbol

logic diagram (positive logic)

OEBA

OEAB

EN1

EN2

OEAB

OEBA

†

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

IEC Publication 617-12.

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

‡

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

Supply voltage, V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V

Input voltage, V : All inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V

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

Operating free-air temperature range, T : SN54ALS243A . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to 125°C

SN74ALS243A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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

SN54ALS243A

MIN NOM MAX

SN74ALS243A

MIN NOM MAX

UNIT

Supply voltage

4.5

5.5

4.5

5.5

High-level input voltage

Low-level input voltage

High-level output current

Low-level output current

Operating free-air temperature

0.7

–12

0.8

–15

°C

–55

125

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54ALS243A, SN74ALS243A

QUADRUPLE BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDAS069B – DECEMBER 1982 – REVISED DECEMBER 1994

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

otherwise noted)

SN54ALS243A

SN74ALS243A

PARAMETER

TEST CONDITIONS

UNIT

†

MIN TYP

MAX

MIN TYP

MAX

= 4.5 V,

I = –18 mA

–1.2

= 4.5 V to 5.5 V,

= –0.4 mA

= –3 mA

= –12 mA

= –15 mA

= 12 mA

–2

2.4

3.2

= 4.5 V

0.25

0.4

0.25

0.35

0.4

0.5

= 4.5 V

= 5.5 V

= 5.5 V,

= 24 mA

Control inputs

A or B ports

V = 7 V

0.1

µA

V = 5.5 V

0.1

Control inputs

V = 2.7 V

‡

A or B ports

Control inputs

–0.1

–112

–0.1

–112

= 5.5 V,

V = 0.4 V

‡

A or B ports

= 2.25 V

–20

–30

Outputs high

Outputs low

= 5.5 V

Outputs disabled

†

‡

All typical values are at V

For I/O ports, the parameters I and I include the off-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

= 5 V, T = 25°C.

IH IL

switching characteristics (see Figure 1)

= 4.5 V to 5.5 V,

= 50 pF,

R1 = 500 Ω,

R2 = 500 Ω,

FROM

(OUTPUT)

PARAMETER

(INPUT)

UNIT

= MIN to MAX

SN54ALS243A SN74ALS243A

MIN

MAX

MIN

MAX

PLH

PHL

PZH

PZL

PHZ

PLZ

PZH

PZL

PHZ

PLZ

A or B

B or A

OEAB

OEBA

For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

SN54ALS243A, SN74ALS243A

QUADRUPLE BUS TRANSCEIVERS

WITH 3-STATE OUTPUTS

SDAS069B – DECEMBER 1982 – REVISED DECEMBER 1994

PARAMETER MEASUREMENT INFORMATION

SERIES 54ALS/74ALS AND 54AS/74AS DEVICES

7 V

= R1 = R2

Test

Point

From Output

Under Test

From Output

Under Test

Test

Point

Test

Point

From Output

Under Test

(see Note A)

LOAD CIRCUIT FOR

BI-STATE

TOTEM-POLE OUTPUTS

LOAD CIRCUIT

FOR OPEN-COLLECTOR OUTPUTS

LOAD CIRCUIT

FOR 3-STATE OUTPUTS

3.5 V

Timing

Input

High-Level

1.3 V

Pulse

0.3 V

3.5 V

0.3 V

Data

Input

Low-Level

1.3 V

Pulse

0.3 V

VOLTAGE WAVEFORMS

SETUP AND HOLD TIMES

VOLTAGE WAVEFORMS

PULSE DURATIONS

3.5 V

0.3 V

Output

Control

(low-level

enabling)

1.3 V

3.5 V

PZL

Input

1.3 V

PLZ

0.3 V

PHL

3.5 V

Waveform 1

S1 Closed

(see Note B)

PLH

1.3 V

In-Phase

Output

1.3 V

0.3 V

PHZ

PLH

PZH

PHL

Waveform 2

S1 Open

(see Note B)

Out-of-Phase

Output

(see Note C)

1.3 V

0.3 V

0 V

VOLTAGE WAVEFORMS

PROPAGATION DELAY TIMES

VOLTAGE WAVEFORMS

ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS

NOTES: A.

C includes probe and jig capacitance.

B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.

Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.

C. When measuring propagation delay items of 3-state outputs, switch S1 is open.

D. All input pulses have the following characteristics: PRR ≤ 1 MHz, t = t = 2 ns, duty cycle = 50%.

E. The outputs are measured one at a time with one transition per measurement.

Figure 1. Load Circuits and Voltage Waveforms

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

IMPORTANT NOTICE

Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue

any product or service without notice, and advise customers to obtain the latest version of relevant information

to verify, before placing orders, that information being relied on is current and complete. All products are sold

subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those

pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent

TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily

performed, except those mandated by government requirements.

CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF

DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL

APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR

WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER

CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO

BE FULLY AT THE CUSTOMER’S RISK.

In order to minimize risks associated with the customer’s applications, adequate design and operating

safeguards must be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent

that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other

intellectual property right of TI covering or relating to any combination, machine, or process in which such

semiconductor products or services might be or are used. TI’s publication of information regarding any third

party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.

SN74ALS243ANSR [TI]

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