PRN102 Datasheet, PDF (1/2 Pages) California Micro Devices Corp – DUAL THEVENIN TERMINATION NETWORK

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: [phone]
Fax: [phone]
C1120600
www.calmicro.com
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