Datasheet PAC470RGQ, PAC500RGQ, PAC560RGQ, PAC680RGQ Datasheet (California Micro Devices)

CALIFORNIA MICRO DEVICES

PACRG

P/Active



 High Performance GTL/ECL Local Termination Network



Features

• Designed especially for Pentium Pro and RISC­based 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.

Applications

• Pentium Pro servers

• Pentium Pro desk top systems

• GTL, ECL terminator for embedded

processor busses

Refer to AP-201 Termination Application Note and AP-203 GTL+
Termination Application Note for further information.

The P/Active RG Termination Networks provide high
performance, high reliability, and low cost through manu­facturing efficiency. The termination resistor elements are
fabricated using proprietary state-of-the-art thin film
technology. CAMD’s highly integrated solution is silicon­based and has the same enhanced reliability characteris­tics 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 manufacturing­friendly and yields the high reliability of other semiconduc­tor components. The P/Active RG Pentium Pro Termination
Network provides a complete 300 point termination
solution in only 14 QSOP packages.

PIN DIAGRAM

)R(ecnareloTetulosbA%5±

egnaRerutarepmeTgnitarepOC°07otC°0

rotsiseR/gnitaRrewoPWm001

erutarepmeTegarotSC°051otC°56–

gnitaRrewoPegakcaPxaM,w00.1

SNOITACIFICEPSDRADNATS

24

R

T

R

T

SEULAVDRADNATS

(R ΩΩΩΩΩ)edoC

74074

05005

65065

86086

1232223214205196187178169151014111312

NOITAMROFNIGNIREDROTRAPDRADNATS

egakcaPrebmuNtraPgniredrO

edoCRsniPelytSsebuTleeR&epaTgnikraMtraP

)%1(07442POSQT/QGR074CAPR/QGR074CAPQGR074CAP

)%1(00542POSQT/QGR005CAPR/QGR005CAPQGR005CAP

)%1(06542POSQT/QGR065CAPR/QGR065CAPQGR065CAP

)%1(08642POSQT/QGR086CAPR/QGR086CAPQGR086CAP

© 2000 California Micro Devices Corp. All rights reserved.

8/10/2000

215 Topaz Street, Milpitas, California 95035 Tel: [phone] Fax: [phone] www.calmicro.com

+'"

1

CALIFORNIA MICRO DEVICES

Cha

500mV/De

Cha

e

PACRG

Signal at Termination and Victim Line (TA=25OC) (See Test Circuit)

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.

250mV/D

Test Circuit Block Diagram

©2000 California Micro Devices Corp. All rights reserved.

2

215 Topaz Street, Milpitas, California 95035 Tel: [phone] Fax: [phone] www.calmicro.com

8/10/2000

CALIFORNIA MICRO DEVICES

Test Circuit

JP1

GND

1

VCC_5

2

GND

3

VCC_3

4

GND

5

VCC_1.5

6

GND

7

GND

8

POWER

VREF

1000pF

GND

C25

0.1uF

PACRG

TP1

TP1

PB1

GND

GND

VCC_3

W1
SMA

GND

C11

0.1uF

GND

GND
GND

GATE1

GATE2

GATE3

GATE4

GND

GND

BUFFER1

GND

GND

1
2
3

5
6

7

8
9

10

12
13

14

15
16

17

19
20
21
22
23

24

26

27

28

GND

RIN1

RIN2

100

VCC_3

GND

C9

0.1uF

GND

100

GND

GND

C8

0.1uF

C10

0.1uF

VCC_5

GND

2
4
6
8

11

13
15

17

1
19

U1

/OEAB
LEAB
A1

A2

A3
VCC_3

A4

A5
A6

A7
A8
A9

A10

A11
A12

A13
A14
A15
VCC_3
A16
A17

CLKIN
/OEBA

LEBA

74GTL16616

U2

1A1
1A2

1A3

1A4
2A1

2A2

2A3
2A4

1G
2G

74FCT244

/CEAB
CLKAB

CLKOUT

CLKBA

/CEBA

VREF

18

1Y1
1Y2

1Y3

1Y4
2Y1

2Y2

2Y3
2Y4

B1

B2

B3

B4

B5
B6

B7
B8
B9

B10

B11
B12

B13
B14
B15

B16
B17

BUFFER1
16
14
12

GATE1

9

7

GATE2

5

GATE3

GATE4

3

TP4

PB4

TP4

GND

VCC_5

C17

GTL1

GTL2
GTL3

GTL4
GTL5
GTL6
GTL7
GTL8
GTL9

GTL10
GTL11

GTL_TEST

VREF
VICTIM

C12

0.1uF

0.1uF

GND

GND

R1

VCC_1.5

56

C15
1000pF

C16

0.1uF

GND

C13

C14

1000pF

0.1uF

GNDVCC_5

GND

56
55
54

52
51

49
48

47

45
44

43

42
41

40

38
37
36
35
34

33

31

30

29

VCC_5

VCC_3

VCC_1.5

GND

VCC_1.5

R3
1K

R4

2KC24

GND

PULSE_GEN

VCC_5

VCC_3

© 2000 California Micro Devices Corp. All rights reserved.

8/10/2000

215 Topaz Street, Milpitas, California 95035 Tel: [phone] Fax: [phone] www.calmicro.com

VCC_1.5

C18
1000pF

GND

TP5
PB5

VICTIM

GND

R2

C20
1000pF

56

VTT

GND

C19

0.1uF

GND

GTL1

GTL2

GTL2
GTL3

GTL3
GTL4
GTL4

C21

GTL5 GTL7

0.1uF

GTL5
GTL6 GTL6

TP3
PB3

GND

U3

R
R

R

R
R
G
R
R
R

R

R
R

PRN331A

24

GTL11

R

23

GTL11

R

22

GTL10

R

21

GTL10

R

20

GTL9

R

19

G

18

R

17

R

16

R

15

R

14

R

13

R

GTL9
GTL8
GTL8

GTL7

VTT

C22
1000pF

VCC_1.5

C23

0.1uF

GND

1

2

3
4
5
6
7
8

9

10
11

12

TP3

3