SN74AS646

更新时间： 2024-11-14 23:03:11

品牌	Logo	应用领域
德州仪器 - TI		总线收发器输出元件
页数	文件大小	规格书
18页	272K
描述
OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS

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SN74AS646 数据手册

SN54ALS646, SN54ALS648, SN54AS646

SN74ALS646A, SN74ALS648A, SN74AS646, SN74AS648

OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS

SDAS039F – DECEMBER 1983 – REVISED JANUARY 1995

SN54ALS646, SN54ALS648, SN54AS646 . . . JT PACKAGE

• Independent Registers for A and B Buses

• Multiplexed Real-Time and Stored Data

• Choice of True or Inverting Data Paths

SN74ALS646A, SN74ALS648A, SN74AS646,

SN74AS648 . . . DW OR NT PACKAGE

(TOP VIEW)

• Choice of 3-State or Open-Collector

CLKAB

SAB

DIR

GND

Outputs

CLKBA

SBA

• Package Options Include Plastic

Small-Outline (DW) Packages, Ceramic

Chip Carriers (FK), and Standard Plastic

(NT) and Ceramic (JT) 300-mil DIPs

DEVICE

OUTPUT

3 state

LOGIC

True

SN54ALS646, SN74ALS646A, ′AS646

SN54ALS648, SN74ALS648A, SN74AS648

3 state

Inverting

description

These devices consist of bus-transceiver circuits

with 3-state or open-collector outputs, D-type

flip-flops, and control circuitry arranged for

multiplexed transmission of data directly from the

data bus or from the internal storage registers.

Data on the A or B bus is clocked into the registers

on the low-to-high transition of the appropriate

clock (CLKAB or CLKBA) input. Figure 1

illustrates the four fundamental bus-management

functions that can be performed with the octal bus

transceivers and registers.

SN54ALS646, SN54ALS648, SN54AS646 . . . FK PACKAGE

(TOP VIEW)

28 27 26

21 B3

20 B4

Output-enable (OE) and direction-control (DIR)

inputs control the transceiver functions. In the

transceiver mode, data present at the high-

impedance port may be stored in either or both

registers.

12 13 14 15 16 17 18

The select-control (SAB and SBA) inputs can

multiplex stored and real-time (transparent mode)

NC – No internal connection

data. Thecircuitryusedforselectcontroleliminatesthetypicaldecodingglitchthatoccursinamultiplexerduring

the transition between stored and real-time data. DIR determines which bus receives data when OE is low. In

the isolation mode (OE high), A data may be stored in one register and/or B data may be stored in the other

When an output function is disabled, the input function is still enabled and can be used to store and transmit

data. Only one of the two buses, A or B, may be driven at a time.

The -1 version of the SN74ALS646A is identical to the standard version, except that the recommended

maximum I

SN54ALS648, or SN74ALS648A.

in the -1 version is increased to 48 mA. There are no -1 versions of the SN54ALS646,

The SN54ALS646, SN54ALS648, and SN54AS646 are characterized for operation over the full military

temperature range of –55°C to 125°C. The SN74ALS646A, SN74ALS648A, SN74AS646, and SN74AS648 are

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

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

12 3 4 5 6 7...18

中文翻译

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与SN74AS646相关器件

型号	品牌	获取价格	描述	数据表
SN74AS646DW	TI	获取价格	OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SN74AS646DW3	TI	获取价格	IC,BUS TRANSCEIVER,SINGLE,8-BIT,AS-TTL,SOP,24PIN,PLASTIC
SN74AS646DWP3	TI	获取价格	IC,BUS TRANSCEIVER,SINGLE,8-BIT,AS-TTL,SOP,24PIN,PLASTIC
SN74AS646DWR	TI	获取价格	AS SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24, GREEN, PLASTIC, SO-24
SN74AS646DWRE4	TI	获取价格	AS SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24, GREEN, PLASTIC, SO-24
SN74AS646FN	TI	获取价格	AS SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PQCC28
SN74AS646FN-00	TI	获取价格	AS SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PQCC28
SN74AS646NT	TI	获取价格	OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SN74AS646NT3	TI	获取价格	AS SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDIP24
SN74AS646NTP1	TI	获取价格	IC,BUS TRANSCEIVER,SINGLE,8-BIT,AS-TTL,DIP,24PIN,PLASTIC

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