Datasheet > UCC5610J

UCC5610J

更新时间： 2024-11-22 23:39:07

品牌	Logo	应用领域
其他 - ETC		/
页数	文件大小	规格书
5页	266K
描述
Terminator

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数据手册

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UCC5610J 数据手册

UCC5610

18-Line 3-5 Volt Low Capacitance SCSI Active Terminator

FEATURES

DESCRIPTION

•

Complies with SCSI, SCSI-2, SCSI-3

and FAST-20 (Ultra) Standards

The UCC5610 provides 18 lines of active termination for a SCSI (Small

Computer Systems Interface) parallel bus. The SCSI standard recom-

mends active termination at both ends of the cable.

•

2.75V to 7V Operation

The UCC5610 is ideal for high performance 3.3V SCSI systems. The key

features contributing to such low operating voltage are the 0.1V drop out

regulator and the 2.75V reference. The reduced reference voltage was

necessary to accommodate the lower termination current dictated in the

SCSI-3 specification. During disconnect the supply current is typically

only 0.5µA, which makes the IC attractive for battery powered systems.

1.8pF Channel Capacitance during

Disconnect

•

0.5µA Supply Current in Disconnect

Mode

110 Ohm/2.5k Programmable

Termination

The UCC5610 is designed with an ultra low channel capacitance of

1.8pF, which eliminates effects on signal integrity from disconnected ter-

minators at interim points on the bus.

•

Completely Meets SCSI Hot Plugging

-650mA Sourcing Current for

Termination

The UCC5610 can be programmed for either a 110 ohm or 2.5k ohm ter-

mination. The 110 ohm termination is used for standard SCSI bus lengths

and the 2.5k ohm termination is typically used in short bus applications.

When driving the TTL compatible DISCNCT pin directly, the 110 ohm ter-

mination is connected when the DISCNCT pin is driven low, and discon-

nected when driven high. When the DISCNCT pin is driven through an

impedance between 80k and 150k, the 2.5k ohm termination is con-

nected when the DISCNCT pin is driven low, and disconnected when

•

+400mA Sinking Current for Active

Negation Drivers

•

Trimmed Termination Current to 4%

Trimmed Impedance to 7%

Current Limit and Thermal Shutdown

Protection

driven high.

continued

BLOCK DIAGRAM

UDG-94128-1

Circuit Design Patented

2/97

12 3 4 5

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