SN54HCT646

更新时间： 2024-09-14 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
8页	156K
描述
OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS

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SN54HCT646 数据手册

SN54HCT646, SN74HCT646

OCTAL BUS TRANSCEIVERS AND REGISTERS

WITH 3-STATE OUTPUTS

SCLS178B – MARCH 1984 – REVISED MAY 1997

SN54HCT646 . . . JT OR W PACKAGE

SN74HCT646 . . . DW OR NT PACKAGE

(TOP VIEW)

Inputs Are TTL-Voltage Compatible

Independent Registers for A and B Buses

Multiplexed Real-Time and Stored Data

True Data Paths

CLKAB

SAB

DIR

GND

CLKBA

SBA

High-Current 3-State Outputs Can Drive up

to 15 LSTTL Loads

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 ’HCT646 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 ’HCT646.

SN54HCT646 . . . 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 can be stored in either or

both registers.

A5 10

12 13 14 15 16 17 18

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 can be stored in one register and/or

B data can be stored in the other register.

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, can be driven at a time.

The SN54HCT646 is characterized for operation over the full military temperature range of –55°C to 125°C.

The SN74HCT646 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 8

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与SN54HCT646相关器件

型号	品牌	获取价格	描述	数据表
SN54HCT646_15	TI	获取价格	OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SN54HCT646FK	TI	获取价格	OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SN54HCT646FKR	TI	获取价格	HCT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, CQCC28, CERAMIC, LCC-28
SN54HCT646JT	TI	获取价格	OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SN54HCT646W	TI	获取价格	OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SN54HCT646WR	TI	获取价格	HCT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, CDFP24, CERAMIC, FP-24
SN54HCT652	TI	获取价格	OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SN54HCT652_15	TI	获取价格	OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SN54HCT652FK	TI	获取价格	OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SN54HCT652FK-00	TI	获取价格	HCT SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, CQCC28

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