Datasheet > UCC5614_14

UCC5614_14

更新时间： 2024-11-21 02:58:39

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
5页	356K
描述
9-LINE 3 TO 5 VOLT LOW CAPACITANCE SCSI ACTIVE TERMINATOR

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UCC5614_14 数据手册

UCC5614

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

FEATURES

DESCRIPTION

•

Complies with SCSI, SCSI-2 and

SCSI-3 Standards

The UCC5614 provides 9 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.

•

2.7V to 7V Operation

The UCC5614 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 2.7V 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 UCC5614 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

-400mA Sourcing Current for

Termination

The UCC5614 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-94029-1

Circuit Design Patented

12/94

12 3 4 5

中文翻译

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