CALIFORNIA MICRO DEVICES
PACR4G
High Performance Bus Termination Network
Features
• Designed especially for High Performance
computers/servers
• Provides high speed bus termination
• Reduces ground bounce with ground
pin placement / Ultra low crosstalk
• Terminates 20 lines in a QSOP package
Applications
• High Performance servers
• High Performance desk top systems
• GTL, NTL, ECL terminator
Product Description
High speed microprocessors demand unique, high
speed bus termination. The PACR4G Termination
Network provides 20 terminations per package and
meets the requirements for high speed terminations.
This Termination Network provides high performance,
high reliability, and low cost through manufacturing
efficiency. The termination resistor elements are
fabricated using state-of-the-art thin film manufacturing.
This integrated solution is silicon-based and has the
same reliability characteristics as any of today’s micro-
processor products. The thin film resistors have very
high stability over temperature, over applied voltage and
over life. In addition the QSOP industry standard
packaging is easy to handle in manufacturing and yields
a high reliability similar to other semiconductor compo-
nents.
S TA N D A R D S P E C I F I C AT I O N S
Absolute Tolerance (R)
Operating Temperature Range
Power Rating/Resistor
Storage Temperature
Package Power Rating
Crosstalk
±1%
0°C to 70°C
100mW
–65°C to 150°C
1.00w, Max
<±2% typical
R
24 23
R
SCHEMATIC CONFIGURATION
22
R
21 20 19
R
R
18 17 16 15
R
R
R
14
R
13
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
90
Code
470
500
560
680
900
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
500
560
680
900
Pins
24
24
24
24
24
Style
QSOP
QSOP
QSOP
QSOP
QSOP
Ordering Part Number
Tubes
PAC470R4GQ/T
PAC500R4GQ/T
PAC560R4GQ/T
PAC680R4GQ/T
PAC680R4GQ/T
Tape & Reel
PAC470R4GQ/R
PAC500R4GQ/R
PAC560R4GQ/R
PAC680R4GQ/R
PAC680R4GQ/R
Part Marking
PAC470R4GQ
PAC500R4GQ
PAC560R4GQ
PAC680R4GQ
PAC680R4GQ
C0970500
© 2000 California Micro Devices Corp. All rights reserved.
7/18/2000
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)
PACR4G
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.
15mV
Cha
500mV/De
15mV
Cha
250mV/De
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
7/18/2000
Embedded System
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