CALIFORNIA MICRO DEVICES
PACRAMBUS-1
HIGH PERFORMANCE RAMBUS TERMINATION NETWORK
FOR RIMM CONNECTOR
Features
2 chip solution for all Rambus load
terminations, in 20-pin QSOP narrow package
14 Terminations in a single package
1% absolute tolerance 28 ohms
terminations across temperature range
Center ground pin placement reduces
ground bounce and eases board layout
Very low cross-talk
Saves board space and reduces assembly cost
Product Description
Applications
Rambus Memory System
The Direct Rambus memory interface transfers data at both edges of a 400MHz clock resulting in an 800MHz transfer rate.
The Rambus channel uses a memory controller on one end of the bus, terminations at the other end, and the RIMM
modules in between. The Rambus channel contains control signals and data bus lines that must be terminated in order to
prevent any reflections. California Micro Devices PAC RAMBUS-1 integrates fourteen 28-ohm resistors specified at 1%
absolute tolerance across the commercial temperature range.
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 todays microprocessor 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 components.
STANDARD SPECIFICATIONS
Resistor (R)
Absolute Tolerance (R) (0° to 70°C)
TCR
Operating Temperature Range
Power Rating/Resistor
Max Package Power Rating (70°C)
Cross Talk
R(
Ω
)
28
O
28 Ohms
±1%
±150ppm
0°C to 70°C
40mW
1.00W
TB D
C
E
J
B
I
T
E
V
SCHEMATIC
Code
280
© 2000 California Micro Devices Corp. All rights reserved.
4/00
C0470199
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
1
CALIFORNIA MICRO DEVICES
The following lines must be terminated:
DQA[8:0]:
Data bus A,
DQB[8:0]:
Data bus B,
CFM, CFMN: Clock From Master (positive and negative polarity),
ROW[2:0]: Row bus,
COL[4:0]:
Column bus.
PACRAMBUS-1
STANDARD PART ORDE RING INFORMATION
Ordering Part Number
Pins
Style
Tubes
Tape & Reel
Part Marking
RECOMMENDED
w
LAYOUT
CRAMBUS-1/T
20
QSOP Narro
PA
(PAC RAM-280) FOR
MBUS-1/R
PACRA
RAMBUS RIMM
ACRAMBUS-1
P
CONNECTOR
Package
O
J
B
C
E
I
T
E
V
©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
4/00
CALIFORNIA MICRO DEVICES
PACRAMBUS-1
QSOP - TOP VIEW
POWER DERATING CURVE
H
CAMD
1
E H
D
e
B
A
C
L
A
1
Lead Plating
Lead Material
Lead Coplanarity
Substrate Material
Body Material
Flammability
MECHANICAL SPECIFICATIONS
Tin-Lead
Copper Alloy
0.004" (0.102mm)
Silicon
Molded Epoxy
UL94V-0
PACKAGE DIME NSIONS, POWE R DISSIPATION & iNFORMATION
Package
Pins #
QSOP
20
inches
min
0.053
0.004
0.008
0.007
0.337
0.150
0.025 BSC
6.19
1.27
1.00W
56 pcs
2,500 pcs
0.228
0.016
0.244
0.050
m ax
0.069
0.010
0.012
0.010
0.344
0.157
A
A
1
B
C
D
E
e
H
L
P
D
@ 70°C
#/tube
#/tape & reel
O
min
1.35
0.10
0.20
0.18
8.56
3.81
5.79
0.40
C
E
J
B
mm
m ax
1.75
0.25
0.30
0.25
8.73
3.98
0.64 BSC
I
T
E
V
© 2000 California Micro Devices Corp. All rights reserved.
4/00
215 Topaz Street, Milpitas, California 95035
Tel: (408) 263-3214
Fax: (408) 263-7846
www.calmicro.com
3
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
