PRN112221/331G/R データシートの表示（PDF） - California Micro Devices Corp

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PRN112221/331G/R

DUAL THÉVENIN TERMINATION NETWORK

California Micro Devices Corp 

CALIFORNIA MICRO DEVICES

PRN102/112

DUAL THÉVENIN TERMINATION NETWORK

Features

• Stable resistor network

• 18 terminating lines/package

• Saves board space and reduces assembly cost

Applications

• SCSI termination

• Thévenin termination

Product Description

Peripheral devices like disk drives, printers, and CD

ROMs are connected to host through a special bus

called SCSI (Small Computer System Interface). The fast

edge rated signals that are transmitted through the SCSI

cable generate ringing on the bus. This will slow down

communication between host and peripherals. The SCSI

standard recommends proper resistor (Thévenin)

termination at host and peripheral locations to eliminate

transmission line effects.

CAMDs PRN102/112 Dual Thévenin Termination

Networks offer high integration and performance in a

miniature QSOP or SOIC package, which saves critical

board area and provides manufacturing cost and

reliability efficiencies.

Why thin film resistor networks? A terminating resistor is

used to reduce or eliminate unwanted reflections on a

transmission line. It can perform this function only when

its resistance value matches the characteristic imped-

ance of the transmission line. The resistors used for

terminating the transmission lines should be noiseless,

stable and functional at high frequencies. Unlike thin

film-based resistor networks, conventional thick film

resistors used for terminating transmission lines are not

stable over temperature and time and impose system

performance limitations at very high frequencies.

SCHEMATIC CONFIGURATION

20 19 18 17 16 15 14 13 12 11

1 2 3 4 5 6 7 8 9 10

STANDARD SPECIFICATIONS

TCR

±250ppm

Operating Temperature Range 0°C to 70°C

Power Rating/Resistor

100mW

Storage Temperature

–65°C to +150°C

Package Power Rating

1W, max.

NON-STANDARD SPECIFICATIONS

Absolute Tolerance (R)

±2%

±1%

R1 (Ω)

220

STANDARD VALUES

R2 (Ω)

Code

330

221/331

NON-STANDARD VALUES

Resistance Range

R1

170Ω to 660Ω

Resistance Range

R2

110Ω to 440Ω

© 2000 California Micro Devices Corp. All rights reserved.

7/14/2000 215 Topaz Street, Milpitas, California 95035

Tel: (408) 263-3214

Fax: (408) 263-7846

C1120600

www.calmicro.com

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