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SN74LVC646DW

更新时间： 2024-11-18 23:06:23

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
9页	126K
描述
OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS

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SN74LVC646DW 数据手册

SN74LVC646

OCTAL BUS TRANSCEIVER AND REGISTER

WITH 3-STATE OUTPUTS

SCAS302A – JANUARY 1993 – REVISED JULY 1995

DB, DW, OR PW PACKAGE

(TOP VIEW)

EPIC (Enhanced-Performance Implanted

CMOS) Submicron Process

Typical V

< 0.8 V at V

(Output Ground Bounce)

OLP

CLKAB

SAB

DIR

GND

= 3.3 V, T = 25°C

CLKBA

SBA

Typical V

> 2 V at V

(Output V

Undershoot)

OHV

= 3.3 V, T = 25°C

Latch-Up Performance Exceeds 250 mA

Per JEDEC Standard JESD-17

Package Options Include Plastic

Small-Outline (DW), Shrink Small-Outline

(DB), and Thin Shrink Small-Outline (PW)

Packages

description

This octal bus transceiver and register is designed for 2.7-V to 3.6-V V

operation.

The SN74LVC646 consists of bus-transceiver circuits, D-type flip-flops, and control circuitry arranged for

multiplexed transmission of data directly from the input bus or from the internal 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

SN74LVC646.

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 register or in both.

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 low. In the isolation mode (OE high), A data can be stored in

one register and B data can be stored in the other register.

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.

To ensure the high-impedance state during power up or power down, OE should be tied to V through a pullup

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

The SN74LVC646 is characterized for operation from –40°C to 85°C.

FUNCTION TABLE

INPUTS

DATA I/Os

B1 – B8

OPERATION OR FUNCTION

DIR

CLKAB

CLKBA

SAB

SBA

A1 – A8

Input

†

↑

Unspecified

Input

Store A, B unspecified

Store B, A unspecified

Store A and B data

†

↑

Unspecified

↑

H or L

↑

H or L

Input

Input disabled

Output

Input disabled

Input

Isolation, hold storage

Real-time B data to A bus

Stored B data to A bus

Real-time A data to B bus

Stored A data to B bus

H or L

Output

Input

Output

H or L

Input

Output

†

The data output functions may be enabled or disabled by various signals at the OE and DIR inputs. Data input functions are always enabled;

i.e., data at the bus pins is stored on every low-to-high transition of the clock inputs.

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.

EPIC is a trademark of Texas Instruments Incorporated.

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...9

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SN74LVC646DW 替代型号

型号	品牌	替代类型	描述	数据表
SN74LVC646ADBR	TI	功能相似	具有三态输出的八路总线收发器和寄存器 \| DB \| 24 \| -40 to 85
SN74LVC646APWR	TI	功能相似	暂无描述
SN74LVC652APW	TI	功能相似	OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS

与SN74LVC646DW相关器件

型号	品牌	获取价格	描述	数据表
SN74LVC646DWR	TI	获取价格	LVC/LCX/Z SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24
SN74LVC646PW	TI	获取价格	OCTAL BUS TRANSCEIVER AND REGISTER WITH 3-STATE OUTPUTS
SN74LVC652A	TI	获取价格	OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SN74LVC652ADB	TI	获取价格	OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SN74LVC652ADBR	TI	获取价格	LVC/LCX/Z SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24, GREEN, PLASTIC, SSOP-
SN74LVC652ADBRE4	TI	获取价格	IC LVC/LCX/Z SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24, GREEN, PLASTIC, SS
SN74LVC652ADBRG4	TI	获取价格	IC LVC/LCX/Z SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24, GREEN, PLASTIC, SS
SN74LVC652ADGVR	TI	获取价格	LVC/LCX/Z SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24
SN74LVC652ADW	TI	获取价格	OCTAL BUS TRANSCEIVERS AND REGISTERS WITH 3-STATE OUTPUTS
SN74LVC652ADWG4	TI	获取价格	LVC/LCX/Z SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24, GREEN, PLASTIC, SOIC-

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