Datasheet > UCC5681

UCC5681

更新时间： 2024-09-19 23:39:07

品牌	Logo	应用领域
其他 - ETC		/
页数	文件大小	规格书
7页	116K
描述
9 Line 2.7- 5V LVD Term. for Ultra2 through Ultra320 SCSI w/ SPI-3 Mode Change Delay & Rvrse Disconn

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UCC5681 数据手册

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SLUS441A – MARCH 1999 – REVISED AUGUST 2000

LVD-Only Active Termination

2.7 V to 5.25 V Operation

Differential Failsafe Bias

Standards Supported: SPI-3, Ultra2

(Fast 40), Ultra3/Ultra160 (Fast 80)

Reversed Disconnect Polarity

Built-In SPI-3 Mode Change Filter/Delay

description

The UCC5681 is an LVD-only Small Computer System Interface (SCSI) terminator that integrates the mode

change delay function required by the SPI-3 specification. The device senses what types of SCSI drivers are

present on the bus via the voltage on the DIFFSENS SCSI control line. Single-ended (SE) and high-voltage

differential (HVD) SCSI drivers (EIA485) are not supported. If the chip detects the presence of an SE or HVD

SCSI driver, it disconnects itself by switching all terminating resistors off the bus and enters a high-impedance

state. The terminator can also be commanded to disconnect the terminating resistors with the DISCNCT input.

Impedance is trimmed for accuracy and maximum effectiveness. Bus lines are biased to a failsafe state to

ensure signal integrity.

The UCC5681 is offered in both 24-pin and 28-pin TSSOP (PW) packages for a temperature range of 0°C to

70°C.

functional block diagram

HIGH–VOLTAGE

DIFFERENTIAL

2.15 V

100 ms

LOW–VOLTAGE

DIFFERENTIAL

DIFFB 11

300 ms

DELAY/

FILTER

LVD{

0.6 V

SINGLE–ENDED

–15 mA≤ I

≤ –5 mA

SOURCE

REF

1.3V

12 DIFSENS

≤

200 A

SINK

124

56 mV

REF

1.25V

–

L1 –

L1+

ENABLE

DISCNCT 15

TRMPWR 28

56 mV

–

DIS

MODE ALL SWITCHES

124

56 mV

LVD

HVD

OPEN

DOWN

OPEN

–

DISCNCT

25 L9 –

26 L9+

56 mV

DISCNCT

–

{28-PIN PACKAGE ONLY

GND

REG

UDG–00126

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.

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POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

12 3 4 5 6 7

中文翻译

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与UCC5681相关器件

型号	品牌	获取价格	描述	数据表
UCC5681PW24	TI	获取价格	9-LINE 105ohm SCSI BUS TERMINATOR, PDSO24, GREEN, PLASTIC, TSSOP-24
UCC5681PW24G4	TI	获取价格	9-LINE 105ohm SCSI BUS TERMINATOR, PDSO24, GREEN, PLASTIC, TSSOP-24
UCC5681PW24TR	TI	获取价格	IC 9-LINE 105 ohm SCSI BUS TERMINATOR, PDSO24, GREEN, PLASTIC, TSSOP-24, Bus Terminator
UCC5681PW24TRG4	TI	获取价格	IC,TERMINATOR,TSSOP,24PIN,PLASTIC
UCC5681PW28	TI	获取价格	9-LINE 105ohm SCSI BUS TERMINATOR, PDSO28, TSSOP-28
UCC5681PW28G4	TI	获取价格	IC,TERMINATOR,TSSOP,28PIN,PLASTIC
UCC5681PW28TR	TI	获取价格	9-LINE 105ohm SCSI BUS TERMINATOR, PDSO28, TSSOP-28
UCC5686	TI	获取价格	27-LINE 3-V - 5V LVD TERMINATOR FOR WIDE ULTRA2, ULTRA3,ULTRA160,AND ULTRA320 SCSI WITH IN
UCC5686_15	TI	获取价格	27-LINE 3-V - 5-V LVD TERMINATOR FOR WIDE ULTRA2
UCC5686PM	TI	获取价格	27-LINE 3-V - 5V LVD TERMINATOR FOR WIDE ULTRA2, ULTRA3,ULTRA160,AND ULTRA320 SCSI WITH IN

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