CALIFORNIA MICRO DEVICES
PACRG
P/Active High Performance GTL/ECL Local Termination Network
Features
• Designed especially for Pentium Pro and RISC-
based computers/servers
• Provides high speed bus termination
• Reduces ground bounce with center ground
pin placement
• Terminates 22 lines in a QSOP package
• Saves board space and reduces assembly cost
Product Description
CAMD’s P/Active RG GTL+ Local Bus Terminator is ideal
for Pentium Pro and related high speed bus termination
applications where a resistor approach is deemed suitable.
This device also meets the high-speed bus termination
demands of microprocessors like Motorola’s PowerPC,
DEC’s Alpha, Sun’s SPARC, and SGI’s MIPs processor, as
well as other high performance RISC processors for
embedded control applications.
The PACRG offers 22 terminations per package and meets
all related Intel specifications for Pentium Pro termination
requirements. Four popular values are available for a
variety of bus termination applications and line impedance
requirements: 47, 50, 56 and 68 ohms.
The P/Active RG Termination Networks provide high
performance, high reliability, and low cost through manu-
facturing efficiency. The termination resistor elements are
fabricated using proprietary state-of-the-art thin film
technology. CAMD’s highly integrated solution is silicon-
based and has the same enhanced reliability characteris-
tics as today’s microprocessor products. The thin film
resistors have very high stability over a wide temperature
range, over applied voltage, and over life. In addition, the
QSOP industry standard packaging is manufacturing-
friendly and yields the high reliability of other semiconduc-
tor components. The P/Active RG Pentium Pro Termination
Network provides a complete 300 point termination
solution in only 14 QSOP packages.
Refer to AP-201 Termination Application Note and AP-203 GTL+
Termination Application Note for further information.
Applications
• Pentium Pro servers
• Pentium Pro desk top systems
• GTL, ECL terminator for embedded
processor busses
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
±5%
0°C to 70°C
100mW
–65°C to 150°C
1.00w, Max
R
T
24 23
R
T
22
PIN DIAGRAM
21 20 19
18 17 16 15
14
13
S TA N D A R D VA L U E S
R (
Ω
)
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
PAC470RGQ/T
PAC500RGQ/T
PAC560RGQ/T
PAC680RGQ/T
Tape & Reel
PAC470RGQ/R
PAC500RGQ/R
PAC560RGQ/R
PAC680RGQ/R
Part Marking
PAC470RGQ
PAC500RGQ
PAC560RGQ
PAC680RGQ
+ ' "
© 2000 California Micro Devices Corp. All rights reserved.
8/10/2000
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)
PACRG
Channel 1 (500mV/division) Termination Signal, Channel 2 (250mV/division) Victim Voltage. The victim voltage
crosstalk measures 65mV in the critical areas around the system clock. The system clock occurs approximately 4ns
before each data transition. The horizontal dashed lines are 65mV 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.
Cha
500mV/De
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
8/10/2000
Microcontroller MCU
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