UCC5621

更新时间： 2024-11-23 12:47:15

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
5页	288K
描述
27 - Line SCSI Terminator With Split Reverse Disconnect

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UCC5621 数据手册

UCC5621

27 - Line SCSI Terminator With Split Reverse Disconnect

FEATURES

DESCRIPTION

• Complies with SCSI, SCSI-2, SCSI-3, UCC5621 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 UCC5621 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 UCC5621 features a split reverse disconnect allowing the user to con-

trol termination lines 10 to 27 with disconnect one, DISCNCT1, and control

terminiation lines 1 to 9 with disconnect two, DISCNCT2.

• 4V To 7V Operation

• 110Ω Termination

The UCC5621 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.

• Completely Meets SCSI Hot Plugging

• –900mA Sourcing Current for

Termination

The power amplifier output stage allows the UCC5621 to source full termi-

nation current and sink active negation current when all termination lines

are actively negated.

• +500mA Sinking Current for Active

Negation

• Logic Command Disconnects all

Termination Lines

The UCC5621, as with all Unitrode terminators, is completely hot plugga-

ble and appears as high impedance at the teminating channels with

VTRMPWR = 0V or open.

• Split Reverse Controls Lines 1 to 9

and 10 to 27 Separately

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-

20 SCSI operation.

• Trimmed Impedance to 5%

• Current Limit and Thermal Shutdown

Protection

(continued)

BLOCK DIAGRAM

UDG-96111

Circuit Design Patented

10/98

12 3 4 5

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