© 2000 California Micro Devices Corp. All rights reserved.
7/18/2000 1
PACR4G
CALIFORNIA MICRO DEVICES
215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
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
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.
Applications
• High Performance servers
• High Performance desk top systems
• GTL, NTL, ECL terminator
C0970500
SCHEMATIC CONFIGURATION
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.
24
RRRR RRRR
RRR
RR
R
RRR
R
RR
1
23
2
22
3
21
4
20
5
19
6
18
7
17
8
16
9
15
10
14
11
13
12
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08642POSQT/QG4R086CAPR/QG4R086CAPQG4R086CAP
00942POSQT/QG4R086CAPR/QG4R086CAPQG4R086CAP
SNOITACIFICEPSDRADNATS
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SEULAVDRADNATS
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©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
2
PACR4G
CALIFORNIA MICRO DEVICES
Signal at Termination and Victim Line (TA = 25OC) (See Test Circuit)
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.
Test Circuit Block Diagram
C
h
a
500
mV
/
D
e
C
h
a
2
50
mV
/
D
e
1
5
m
V
15mV
© 2000 California Micro Devices Corp. All rights reserved.
7/18/2000 3
PACR4G
CALIFORNIA MICRO DEVICES
215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
Test Circuit
VCC_1.5
R
1
R
2
G
3
R
4
R
5
R
6
G
7
R
8
R
9
G
10
R
11
R
12 R13
R14
G15
R16
R17
R18
G19
R20
R21
G22
R23
R24
U3
PRN331B C22
1000pF
C23
0.1uF
TP5
PB5
VICTIM
VTT
VTT
GTL2
GTL3
VTT
GTL4
GTL4
VTT VTT
GTL8
GTL8
GTL9
GTL9
GTL11
GTL11
VTT
GTL7
GTL1
GND
R2
56
C18
1000pF
C19
0.1uF
C20
1000pF
C21
0.1uF
VCC_1.5
GND
R1
56
C15
1000pF
C16
0.1uF
C17
0.1uF
GTL1
GTL2
GTL3
GTL4
GTL5
GTL6
GTL8
GTL7
VCC_5
VCC_1.5
GND
GND
GND
/OEAB
1
LEAB
2
A1
3
A2
5
A3
6
VCC_3
7
A4
8
A5
9
A6
10
A7
12
A8
13
A9
14
A10
15
A11
16
A12
17
A13
19
A14
20
A15
21
VCC_3
22
A16
23
A17
24
CLKIN
26
/OEBA
27
LEBA
28 /CEBA 29
CLKBA 30
CLKOUT 31
B17 33
B16 34
VREF 35
B15 36
B14 37
B13 38
B12 40
B11 41
B10 42
B9 43
B8 44
B7 45
B6 47
B5 48
B4 49
B3 51
B2 52
B1 54
CLKAB 55
/CEAB 56
U1
74GTL16616
C8
0.1uF
C9
0.1uF
VCC_3
GND
GND
GND
GATE1
GATE2
GATE3
GND
GND
GND
1A1
2
1A2
4
1A3
6
1A4
8
2A1
11
2A2
13
2A3
15
2A4
17
1G
1
2G
19
1Y1 18
1Y2 16
1Y3 14
1Y4 12
2Y1 9
2Y2 7
2Y3 5
2Y4 3
U2
74FCT244
GATE1
GATE2
GATE3
GATE4
BUFFER1
VCC_5
W1
SMA
RIN1
100
RIN2
100
TP1
PB1
TP1
BUFFER1
GND
GND
GND
PULSE_GEN
GND
GND
TP4
PB4
TP4
GND
C10
0.1uF
C11
0.1uF
VCC_3
GND
GND
GATE4
GND
VCC_5
GND
GND
VCC_3
C12
0.1uF
C13
1000pF
C14
0.1uF
VREF
GTL9
GTL11
GTL10
GTL_TEST
VICTIM
GNDVCC_5
GND
GND
R3
1K
R4
2KC24
1000pF
C25
0.1uF
VREF
VCC_1.5
GND
TP3
PB3
TP3
GTL2
GTL6 GTL6
GTL7
GND
GND
GND
GND
1
2
3
4
5
6
7
8
JP1
POWER
VCC_5
VCC_3
VCC_1.5
GND
GND
GND
GND
GND
GND
VCC_1.5
VCC_5
VCC_3
GTL3