UCC5620FQPTR

更新时间： 2024-11-23 13:15:07

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德州仪器 - TI		/
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UCC5620FQPTR 数据手册

UCC5620

27-Line SCSI Terminator

FEATURES

DESCRIPTION

• Complies with SCSI, SCSI-2, SCSI-3,

SPI and FAST-20 (Ultra) Standards

UCC5620 provides 27 lines of active termination for a SCSI (Small Com-

puter Systems Interface) parallel bus. The SCSI standard recommends

active termination at both ends of the cable.

• 2.5pF Channel Capacitance during

Disconnect

The UCC5620 is ideal for high performance 5V SCSI systems. During

disconnect the supply current is typically only 100µA, which makes the IC

attractive for lower powered systems.

• 100mA Supply Current in Disconnect

Mode

The UCC5620 is designed with a low channel capacitance of 2.5pF,

which eliminates effects on signal integrity from disconnected terminators

at interim points on the bus.

• 4V To 7V Operation

• 110 Termination

The power amplifier output stage allows the UCC5620 to source full ter-

mination current and sink active negation current when all termination

lines are actively negated.

• Completely Meets SCSI Hot Plugging

• –900mA Sourcing Current for

Termination

The UCC5620, as with all Unitrode terminators, is completely hot plugga-

ble and appears as high impedance at the teminating channels with

V_TRMPWR= 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 QSOP (MWP) and 48-Pin LQFP (FQP).

Protection

Consult QSOP-36 or LQFP-48 packaging diagram for exact dimensions.

BLOCK DIAGRAM

UDG-96109

Circuit Design Patented

SLUS287A - OCTOBER 1999

12 3 4

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