SN54HC646

更新时间： 2024-11-05 23:03:03

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
10页	177K
描述
OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS

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SN54HC646 数据手册

SN54HC646, SN74HC646

OCTAL BUS TRANSCEIVERS AND REGISTERS

WITH 3-STATE OUTPUTS

SCLS150B – DECEMBER 1982 – REVISED MAY 1997

SN54HC646 . . . JT OR W PACKAGE

SN74HC646 . . . DW OR NT PACKAGE

(TOP VIEW)

Independent Registers for A and B Buses

Multiplexed Real-Time and Stored Data

True Data Paths

CLKAB

SAB

DIR

GND

High-Current 3-State Outputs Can Drive up

to 15 LSTTL Loads

CLKBA

SBA

Package Options Include Plastic

Small-Outline (DW) and Ceramic Flat (W)

Packages, Ceramic Chip Carriers (FK), and

Standard Plastic (NT) and Ceramic (JT)

300-mil DIPs

description

The ’HC646 consist of bus-transceiver circuits

with 3-state outputs, D-type flip-flops, and control

circuitry arranged for multiplexed transmission of

data directly from the input bus or from the internal

registers. DataontheAorBbusisclockedintothe

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 ’HC646.

SN54HC646 . . . FK PACKAGE

(TOP VIEW)

28 27 26

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.

A5 10

The select-control (SAB and SBA) inputs can

multiplex stored and real-time (transparent mode)

data. DIR determines which bus receives data

when OE is active (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 register.

12 13 14 15 16 17 18

NC – No internal connection

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 SN54HC646 is characterized for operation over the full military temperature range of –55°C to 125°C. The

SN74HC646 is characterized for operation from –40°C to 85°C.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

UNLESS OTHERWISE NOTED this document contains PRODUCTION

DATA information 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...10

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与SN54HC646相关器件

型号	品牌	获取价格	描述	数据表
SN54HC646_15	TI	获取价格	OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SN54HC646FH	TI	获取价格	IC,BUS TRANSCEIVER,SINGLE,8-BIT,HC-CMOS,LLCC,28PIN,CERAMIC
SN54HC646FK	TI	获取价格	OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SN54HC646FK-00	TI	获取价格	HC/UH SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, CQCC28
SN54HC646FKR	TI	获取价格	HC/UH SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, CQCC28, CERAMIC, LCC-28
SN54HC646JT	TI	获取价格	OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SN54HC646JT-00	TI	获取价格	HC/UH SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, CDIP24
SN54HC646W	TI	获取价格	OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SN54HC646WR	TI	获取价格	HC/UH SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, CDFP24, CERAMIC, FP-24
SN54HC648JT-00	TI	获取价格	HC/UH SERIES, 8-BIT REGISTERED TRANSCEIVER, INVERTED OUTPUT, CDIP24

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