UCC5619

更新时间： 2024-11-22 22:49:27

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
4页	106K
描述
27-Line SCSI Terminator With Reverse Disconnect

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UCC5619 数据手册

UCC5619

27-Line SCSI Terminator With Reverse Disconnect

FEATURES

DESCRIPTION

• Complies with SCSI, SCSI-2, SCSI-3, UCC5619 provides 27 lines of active termination for a SCSI (Small Com-

SPI and FAST-20 (Ultra) Standards

puter Systems Interface) parallel bus. The SCSI standard recommends ac-

tive termination at both ends of the cable.

• 2.5pF Channel Capacitance during

Disconnect

The UCC5619 is ideal for high performance 5V SCSI systems. During dis-

connect the supply current is typically only 100µA, which makes the IC at-

tractive for lower powered systems.

• 100µA Supply Current in Disconnect

Mode

The UCC5619 is designed with a low channel capacitance of 2.5pF, which

eliminates effects on signal integrity from disconnected terminators at in-

terim points on the bus.

• 4V To 7V Operation

• 110 Termination

The power amplifier output stage allows the UCC5619 to source full termi-

nation current and sink active negation current when all termination lines

are actively negated.

• Completely Meets SCSI Hot Plugging

• –900mA Sourcing Current for

Termination

The UCC5619, as with all Unitrode terminators, is completely hot pluggable

and appears as high impedance at the teminating channels with VTRMPWR

= 0V or open.

• +500mA Sinking Current for Active

Negation

• Logic Command Disconnects all

Termination Lines

Internal circuit trimming is utilized, first to trim the 110Ω impedance, and

then most importantly, to trim the output current as close to the maximum

SCSI-3 specification as possible, which maximizes noise margin in fast

SCSI operation.

• Trimmed Impedance to 5%

• Current Limit and Thermal Shutdown

Other features include thermal shutdown and current limit. This device is

offered in low thermal resistance versions of the industry standard 36 pin

wide body QSSOP (MWP) and 48 pin LQFP (FQP).

Protection

Consult SSOP-36 (MWP QSSOP-36) and FQP-48 Packaging Diagram for

exact dimensions.

BLOCK DIAGRAM

UDG-96108

Circuit Design Patented

10/98

12 3 4

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