CALIFORNIA MICRO DEVICES
PACR6G
EMI/RFI T-Filter
Features
• Highly integrated bus termination network
• 1% absolute tolerance terminations
• Ultra-low crosstalk
• 18 terminating lines in QSOP package
• Saves board space and improves system reliability
• Reduces assembly cost and rework
Applications
• Pentium
®
Pro servers & desktop systems
• Engineering workstations
• Embedded processor systems
• GTL, ECL, NTL, HSTL terminator
Product Description
High speed microprocessors like Intel’s Pentium
®
Pro
Processor, demand unique, high speed bus termination
schemes. The PACR6G series network provides 18
terminations per package. Four termination resistor
values are available. The 47, 50 and 56 ohm termina-
tions are suitable for use with the Intel server chip set
and the 68 ohm termination is suitable for use with the
Intel desktop chip set. The tight resistor tolerance
minimizes noise contribution from termination
mismatching.
The PACR6G network offers high performance, high
reliability, and low cost through manufacturing efficiency.
It meets or exceeds all Intel specifications for termina-
tion performance and provides an additional degree
of system noise margin. The termination resistor
elements are fabricated using state-of-the-art thin film
manufacturing. This highly integrated solution is silicon-
based and has the same reliability characteristics as
any of today’s microprocessor products. The thin film
resistors
†
have excellent stability over temperature,
over applied voltage, and over product life. In addition,
the QSOP industry standard packaging is easy to
handle in manufacturing and provides interconnect
reliability — on par with other common semiconductor
components — and far better than traditional thick film-
based chip products.
S TA N D A R D S P E C I F I C AT I O N S
Absolute Tolerance (0°C to 70°C)
Operating Temperature Range
Power Rating/Resistor
Max Package Power Rating ( 70°C)
Crosstalk (See Test Circuit)
±1%
0°C to 70°C
100mW
1.00w, Max
±18mV (typical)
R
R
SCHEMATIC CONFIGURATION
24 23 22 21 20 19 18 17 16 15 14 13
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
S TA N D A R D VA L U E S
R (W)
47
50
56
68
Code
470
500
560
680
1
2
3
4
5
6
7
8
9
10 11 12
S TA N D A R D PA R T O R D E R I N G I N F O R M AT I O N
Package
R Code
470(1%)
500(1%)
560(1%)
680(1%)
Pins
24
24
24
24
Style
QSOP
QSOP
QSOP
QSOP
Ordering Part Number
Tubes
PAC470R6GQ/T
PAC500R6GQ/T
PAC560R6GQ/T
PAC680R6GQ/T
Tape & Reel
PAC470R6GQ/R
PAC500R6GQ/R
PAC560R6GQ/R
PAC680R6GQ/R
Part Marking
PAC470R6GQ
PAC500R6GQ
PAC560R6GQ
PAC680R6GQ
C0970500
© 2000 California Micro Devices Corp. All rights reserved.
7/17/2000
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1
CALIFORNIA MICRO DEVICES
Signal at Termination and Victim Line (TA = 25
O
C) (See Test Circuit)
PACR6G
Channel 1 (500mV/division) Termination Signal, Channel 2 (50mV/division) Victim Voltage. The victim voltage crosstalk
measures 35mV in the critical areas around the system clock. The system clock occurs approximately 4ns before
each data transition. The horizontal dashed lines are 35mV apart. The time scale is 5.0ns/division. (The signal voltage
rise and fall times have been adjusted at the driver to conform to Intel specifications.) Measurements made using
Tektronix TDS820 6 GHz Digitizing Oscilloscope with P6207 FET Probes.
Channel 1
Channel 2
:35mV
Test Circuit Block Diagram
©2000 California Micro Devices Corp. All rights reserved.
2
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
7/17/2000
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