UC5604N [TI]

Cost Reduced 9-Line 5V Terminator for SCSI and Fast SCSI 16-PDIP 0 to 70;


型号：	UC5604N
厂家：	TEXAS INSTRUMENTS
描述：	Cost Reduced 9-Line 5V Terminator for SCSI and Fast SCSI 16-PDIP 0 to 70 光电二极管接口集成电路
文件：	总5页 (文件大小：242K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

UC5604

9-Line Low Capacitance SCSI Active Terminator

FEATURES

DESCRIPTION

•

Complies with SCSI, SCSI-2

Standards

The UC5604 provides 9 lines of active termination for a SCSI (Small Com-

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

tive termination at both ends of the cable segment.

9pF Channel Capacitance during

Disconnect

The UC5604 provides a disconnect feature which, when opened or driven

high, will disconnect all terminating resistors and disable the regulator,

greatly reducing standby power. The output channels remain high imped-

ance even without Termpwr applied.

100µA Supply Current in

Disconnect Mode

•

Meets SCSI Hot Plugging Capability

The UC5604 is pin-for-pin compatible with its predecessor, the UC5603 - 9

line Active Terminator. The only functional difference between the UC5604

and UC5603 is the absence of the negative clamps. Parametrically, the

UC5604 has a 7% tolerance on impedance and current compared to a 3%

tolerance on the UC5603 and the sink current is reduced from 300mA to

40mA. Custom power packages are utilized to allow normal operation at

full power conditions (1.2 watts).

−300mA Sourcing Current for

Termination

•

+40mA Sinking Current for Active

Negation

Logic Command Disconnects all

Termination Lines

Internal circuit trimming is utilized, first to trim the impedance to a 7% toler-

ance, and then most importantly, to trim the output current to a 7% toler-

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

margin in fast SCSI operation.

•

Trimmed Termination Current to 7%

Trimmed Impedance to 7%

Current Limit and Thermal

Shutdown Protection

Other features include thermal shutdown and current limit.

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

standard 16 pin narrow body SOIC, 16 pin ZIP (zig-zag in line package)

and 24 pin TSSOP.

BLOCK DIAGRAM

UDG-94064

Circuit Design Patented

3/97

UC5604

ABSOLUTE MAXIMUM RATINGS

Termpwr Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7V

Signal Line Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to +7V

Regulator Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5A

Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to +150°C

Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55°C to +150°C

Lead Temperature (Soldering, 10 Sec.) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C

Unless otherwise specified all voltages are with respect to Ground. Currents are posi-

tive into, negative out of the specified terminal.

Consult Packaging Section of Unitrode Integrated Circuits databook for thermal limita-

tions and considerations of packages.

RECOMMENDED OPERATING CONDITIONS

Termpwr Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.8V to 5.25V

Signal Line Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to +5V

Disconnect Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to Termpwr

CONNECTION DIAGRAMS

TSSOP-24 (Top View)

PWP Package

DIL-16 (Top View)

N or J Package

* PWP package pin 5 serves as signal ground; pins 6, 7, 8, 9,

17, 18, 19, and 20 serve as heatsink/ground.

ZIP-16 (Top View)

Z Package

SOIC-16 (Top View)

DP Package

* DP package pin 5 serves as signal ground; pins 4, 12, 13

serve as heatsink/ground.

Note: Drawings are not to scale.

UC5604

ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA = 0°C to 70°C.

TRMPWR = 4.75V, DISCNCT = 0V. TA = TJ.

PARAMETER

Supply Current Section

Termpwr Supply Current

TEST CONDITIONS

MIN

TYP

MAX UNITS

All termination lines = Open

µA

All termination lines = 0.5V

DISCNCT = Open

200

100

220

150

Power Down Mode

Output Section (Terminator Lines)

Terminator Impedance

∆ILINE = -5mA to -15mA

110

129 Ohms

Output High Voltage

TRMPWR = 4V (Note 1)

0°C < TJ < 70°C 2.55

3.2

3.1

TJ = 25°C

2.6

2.9

Max Output Current

VLINE = 0.5V

-19.5 -21.9 -22.4

0°C < TJ < 70°C -18.5 -21.9 -22.4

TJ = 25°C -18.0 -21.9 -22.4

0°C < TJ < 70°C -17.0 -21.9 -22.4

VLINE = 0.5V, TRMPWR = 4V (Note 1)

ILINE = -30mA

Output Clamp Level

Output Leakage

-0.2

-0.05

0.1

400

100

400

TRMPWR = 0V to 5.25V VLINE = 0 to 4V

REG = 0V

µA

DISCNCT = 4V

VLINE = 5.25V

TRMPWR = 0V to 5.25V, REG = Open

VLINE = 0V to 5.25V

Output Capacitance

Regulator Section

Regulator Output Voltage

Line Regulation

DISCNCT = Open (Note 2)

2.5

2.9

3.2

3.1

All Termination Lines = 5V

TRMPWR = 4V to 6V

IREG = +100mA to -100mA

All Termination Lines = 0.5V

VREG = 0V

2.55

Load Regulation

Drop Out Voltage

1.0

-400

1.2

-600

Short Circuit Current

Sinking Current Capability

Thermal Shutdown

-200

°C

VREG = 3.5V

170

Thermal Shutdown Hysteresis

Disconnect Section

Disconnect Threshold

Threshold Hysteresis

Input Current

1.1

1.4

100

150

1.7

µA

DISCNCT = 0V

200

Note 1: Measuring each termination line while other 8 are low (0.5V).

Note 2: Guaranteed by design. Not 100% tested in production.

APPLICATION INFORMATION

UDG-94065

Figure 1: Typical SCSI Bus Configurations Utilizing 2 UC5604 Devices

UC5604

APPLICATION INFORMATION (cont.)

UDG-94066

Figure 2: Typical Wide SCSI Bus Configurations Utilizing 3 UC5604 Devices.

UNITRODE CORPORATION

7 CONTINENTAL BLVD. • MERRIMACK, NH 03054

TEL. (603) 424-2410 • FAX (603) 424-3460

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