UCC5638

更新时间： 2024-09-19 22:49:27

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
5页	52K
描述
Multimode SCSI 15 Line Terminator

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UCC5638 数据手册

UCC5638

Multimode SCSI 15 Line Terminator

DESCRIPTION

FEATURES

The UCC5638 Multimode SCSI Terminator provides a smooth transition

into the next generation of the SCSI Parallel Interface (SPI-2). It automati-

cally senses the bus, via DIFFB, and switches the termination to either sin-

gle ended (SE) or low voltage differential (LVD) SCSI, dependent on which

type of devices are connected to the bus. The UCC5638 can not be used

on a HVD, EIA485, differential SCSI bus. If the UCC5638 detects a HVD

SCSI device, it switches to a high impedance state.

• Auto Selection Single Ended (SE) or

Low Voltage Differential (LVD)

Termination

• Meets SCSI-1, SCSI-2, SCSI-3, SPI,

Ultra (Fast-20), Ultra2 (SPI-2 LVD

SCSI) and Ultra3/Ultra160 Standards

• 2.7V to 5.25V Operation

• Differential Failsafe Bias

The Multimode terminator contains all functions required to terminate and

auto detect and switch modes for SPI-2 bus architectures. Single Ended

and Differential impedances and currents are trimmed for maximum effec-

tiveness. Fail Safe biasing is provided to insure signal integrity. Device/Bus

type detection circuitry is integrated into the terminator to provide automatic

switching of termination between single ended and LVD SCSI and a high

impedance for HVD SCSI. The multimode function provides all the perform-

ance analog functions necessary to implement SPI-2 termination in a sin-

gle monolithic device.

• Thermal packaging for low junction

temperature and better MTBF.

The UCC5638 is offered in a 48 pin LQFP package for a temperature range

of 0°C to 70°C.

BLOCK DIAGRAM

(NOISE LOAD)

HIGH POWER

2.15V

DIFFB 34

0.6V

DIFFERENTIAL

REF

1.3V

35 DIFFSEN

LOW VOLTAGE

DIFFERENTIAL

–15mA ≤ I

50µA ≤ I

≤ –5mA

SOURCE

≤ 200µA

SINGLE ENDED

SINK

110

124

REF

2.7V

SOURCE/SINK REGULATOR

56mV

52.5

–

REF

1.25V

12 L1–

11 L1+

56mV

–

MODE

ALL SWITCHES

LVD

DISCNCT

DOWN

OPEN

SE GND SWITCH

10µA

110

124

DISCNCT

TRMPWR

56mV

52.5

–

L15–

L15+

56mV

–

SE GND SWITCH

HS/GND

4-9

HS/GND

28-33

REG

4.7µF .

GND

UDG-98063

SLUS271A - FEBRUARY 2000

12 3 4 5

中文翻译

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UCC5638_06	TI	获取价格	Multimode SCSI 15 Line Terminator
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UCC5638FQPTR	TI	获取价格	Multimode SCSI 15 Line Terminator
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