UC5603

更新时间： 2024-11-18 22:17:51

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
5页	257K
描述
9-Line SCSI Active Terminator

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数据手册

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UC5603 数据手册

UC5603

9-Line SCSI Active Terminator

FEATURES

DESCRIPTION

•

Complies with SCSI, SCSI-2 and

SPI-2 Standards

The UC5603 provides 9 lines of active termination for a SCSI (Small Comput-

ers Systems Interface) parallel bus. The SCSI standard recommends active

termination at both ends of the cable segment.

6pF Channel Capacitance during

Disconnect

The UC5603 provides a disconnect feature which, when opened or driven

high, will disconnect all terminating resistors, and disables the regulator;

greatly reducing standby power. The output channels remain high impedance

even without Termpwr applied. A low channel capacitance of 6pF allows units

at interim points of the bus to have little to no effect on the signal integrity.

100µA Supply Current in

Disconnect Mode

•

Meets SCSI Hot Plugging

Functionally the UC5603 is similar to its predecessor, the UC5601 - 18 line

Active Terminator. Several electrical enhancements were incorporated in the

UC5603, such as a sink/source regulator output stage to accommodate all

signal lines at +5V, while the regulator remains at its nominal value, reduced

channel capacitance to 6pF typical, and as with the UC5601, custom power

packages are utilized to allow normal operation at full power conditions (1.2

watts).

-400mA Sourcing Current for

Termination

•

+400mA Sinking Current for

Active Negation Drivers

Logic Command Disconnects all

Termination Lines

Trimmed Termination Current to

Internal circuit trimming is utilized, first to trim the impedance to a 3% toler-

ance, and then most importantly, to trim the output current to a 3% tolerance,

as close to the max SCSI spec as possible, which maximizes noise margin in

fast SCSI operation.

•

Trimmed Impedance to 3%

Negative Clamping on all Signal

Lines

Other features include negative clamping on all signal lines to protect exter-

nal circuitry from latch-up, thermal shutdown and current limit.

•

Current Limit and Thermal

Shutdown Protection

This device is offered in low thermal resistance versions of the industry stand-

ard 16 pin narrow body SOIC, 16 pin ZIP (zig-zag in line package) and 24 pin

TSSOP.

BLOCK DIAGRAM

UDG-94049

Circuit Design Patented

3/97

12 3 4 5

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与UC5603相关器件

型号	品牌	获取价格	描述	数据表
UC5603DP	TI	获取价格	9-LINE SCSI ACTIVE TERMINATOR
UC5603DPG4	TI	获取价格	9-LINE SCSI ACTIVE TERMINATOR
UC5603DPR	TI	获取价格	9-LINE SCSI ACTIVE TERMINATOR
UC5603DPRTR	TI	获取价格	9-LINE SCSI ACTIVE TERMINATOR
UC5603DPTR	TI	获取价格	9-LINE SCSI ACTIVE TERMINATOR
UC5603DPTRG4	TI	获取价格	9-LINE SCSI ACTIVE TERMINATOR
UC5603J	TI	获取价格	9-LINE SCSI ACTIVE TERMINATOR
UC5603N	ETC	获取价格	Terminator
UC5603NTR	TI	获取价格	IC SCSI BUS TERMINATOR, Bus Terminator
UC5603PWP	TI	获取价格	9-LINE 110ohm SCSI BUS TERMINATOR, PDSO24, TSSOP-24