Datasheet > UCC5641PW28

UCC5641PW28

更新时间： 2024-09-19 23:39:07

品牌	Logo	应用领域
其他 - ETC		接口集成电路光电二极管信息通信管理
页数	文件大小	规格书
5页	75K
描述
TERMINATOR\|BICMOS\|TSSOP\|28PIN\|PLASTIC

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UCC5641PW28 数据手册

UCC5641

Low Voltage Differential (LVD) SCSI 9 Line Terminator

FEATURES

DESCRIPTION

• First LVD only Active Terminator

The UCC5641 is an active terminator for Low Voltage Differential (LVD)

SCSI networks. This LVD only design allows the user to reach peak bus

performance while reducing system cost. The device is designed as an

active Y-terminator to improve the frequency response of the LVD Bus.

Designed with a 1.5pF channel capacitance, the UCC5641 allows for mini-

mal bus loading for a maximum number of peripherals. With the

UCC5641, the designer will be able to comply with the Fast-40 SPI-2 and

Fast-80 SPI-3 specifications. The UCC5641 also provides a much-needed

system migration path for ever improving SCSI system standards. This de-

vice is available in the 24 pin TSSOP and 28 pin TSSOP for ease of lay-

out use.

• Meets SCSI SPI-2 Ultra2 (Fast-40)

and Ultra3 / Ultra160 (Fast-80)

Standards

• 2.7V to 5.25V Operation

• Differential Failsafe Bias

• Reversed Disconnect Polarity

The UCC5641 is not designed for use in single ended or high voltage dif-

ferential systems.

BLOCK DIAGRAM

SOURCE ONLY FROM TRMPWR AND THE ENABLED TERMINATIONS

OPEN CIRCUIT ON POWER OFF

OR OPEN CIRCUIT IN A

DISABLED TERMINATOR MODE

SOURCE 5–15mA

SINK 200µA MAXIMUM (NOISE LOAD)

TRMPWR 28

2.7V to 5.25V

REF 1.3V

DIFSENS

1.3V 0.1V

HIGH POWER

DIFFERENTIAL

2.4V > 1.9V

DIFFB

20k

27 LVD*

HIGH IMPEDANCE RECEIVER

EVEN WITH POWER OFF

0.1µF

0.7V > 0.5V

SINGLE

ENDED

SOURCE/SINK REGULATOR

REF 1.25V

124

56mV

LOW

FREQUENCY

FILTER

–

L1–

L1+

56mV

50Hz – 60Hz

–

10µA

56mV

–

26 L9–

25 L9+

DISCNCT 15

56mV

–

GND

REG

4.7µF

UDG-99160

* 28 pin package only

SLUS397 - JANUARY 2000

12 3 4 5

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