2000 California Micro Devices Corp. All rights reserved.
7/21/2000
1
CSPDDR100
CALIFORNIA MICRO DEVICES
215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
Chip Scale DDR Termination Array
Features
16 Integrated High frequency Series/Parallel
Terminations
Ultra small footprint Chip Scale Package
Ceramic substrate
0.35mm Eutectic Solder Bumps, 0.65mm Pitch
Product Description
The CSPDDR100 is a high performance Integrated
Passive Device (IPD) which provides Series/Parallel
terminations suitable for use in SSTL and DDR termina-
tion applications. Sixteen (16) Series/Parallel termination
channels are provided for a total of 32 integrated
resistors. These resistors provide excellent high fre-
quency performance in excess of 3GHz and are manu-
factured to an absolute tolerance of 1%. The Chip
Applications
DDR Memory bus termination
SSTL Termination
C1260700
SCHEMATIC DIAGRAM
Scale Package provides an ultra small footprint for
this Integrated Passive Device and provides minimal
parasitics compared to conventional packaging. Typical
bump inductance is less than 25pH. The large solder
bumps and ceramic substrate allow for standard attach-
ment to laminate printed circuit boards without the use
of underfill. The 4X9 Bump pattern is arranged for easy
flow through routing on the pcb.
R1
R2
R2
R1
D
C
B
A
1
2
3
4
5
R2
R1
R2
R1
R2
R1
R1
R2
R1
R2
R1
R2
R1
R2
R1
R2
R1
R2
R1
R2
R2
R1
6
7
8
9
R2
R1
R2
R1
R2
R1
N
O
I
T
A
M
R
O
F
N
I
G
N
I
R
E
D
R
O
T
R
A
P
D
R
A
D
N
A
T
S
e
g
a
k
c
a
P
r
e
b
m
u
N
t
r
a
P
g
n
i
r
e
d
r
O
e
l
y
t
S
s
p
m
u
B
l
e
e
R
&
e
p
a
T
g
n
i
k
r
a
M
t
r
a
P
e
l
a
c
S
p
i
h
C
6
3
0
0
1
R
D
D
P
S
C
1
A
p
m
u
b
k
r
a
m
o
t
t
o
d
k
n
I
2000 California Micro Devices Corp. All rights reserved.
7/21/2000
215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
2
CSPDDR100
CALIFORNIA MICRO DEVICES
Package Diagram (Bumps Up View)
D
C
B
A
1
9
Typical PCB Routing Diagram (Bumps Down View)
S
N
O
I
T
A
D
N
E
M
M
O
C
E
R
D
R
A
O
B
T
I
U
C
R
I
C
D
E
T
N
I
R
P
B
C
P
n
o
e
z
i
S
d
a
P
m
m
0
0
3
.
0
e
p
a
h
S
d
a
P
d
n
u
o
R
n
o
i
t
i
n
i
f
e
D
d
a
P
)
D
M
S
N
(
s
d
a
P
d
e
n
i
f
e
D
k
s
a
M
r
e
d
l
o
S
n
o
N
g
n
i
n
e
p
O
k
s
a
M
r
e
d
l
o
S
m
m
0
5
3
.
0
s
s
e
n
k
c
i
h
T
li
c
n
e
t
S
r
e
d
l
o
S
m
m
2
5
1
.
0
g
n
i
n
e
p
O
e
r
u
t
r
e
p
A
li
c
n
e
t
S
r
e
d
l
o
S
)
.
q
s
(
m
m
0
6
3
.
0
o
i
t
a
R
x
u
l
F
r
e
d
l
o
S
0
5
/
0
5
e
t
s
a
P
r
e
d
l
o
S
n
a
e
l
C
o
N
h
s
i
n
i
F
e
c
a
r
T
d
n
o
B
)
A
6
0
1
s
u
l
P
u
C
k
e
t
n
E
(
P
S
O
1
A
B
C
D
2
3
4
5
6
7
8
9
2.44mm
0.381mm
0.65
mm
0.65
mm
0.875mm
0.245
mm
0.35mm
Dia.
Bumps
0.297mm
5.79mm
2000 California Micro Devices Corp. All rights reserved.
7/21/2000
3
CSPDDR100
CALIFORNIA MICRO DEVICES
215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
(
s
e
u
l
a
V
r
o
t
s
i
s
e
R
)
(
1
R
)
)
)
)
)
(
2
R
)
)
)
)
)
e
d
o
C
5
2
0
5
0
0
1
PART NUMBER KEY
CSP DDR 100
PACKAGE TYPE
APPLICATION
Resistor Value Code
CSP = Chip Scale Package
DDR = Double Data Rate
Memory Termination
100 = R
1
25
; R
2
50
S
E
U
L
A
V
D
R
A
D
N
A
T
S
e
u
l
a
V
r
o
t
s
i
s
e
R
5
2
=
1
R
,
0
5
=
2
R
,
R
e
c
n
a
r
e
l
o
T
e
t
u
l
o
s
b
A
%
1
s
r
o
t
s
i
s
e
R
f
o
R
C
T
m
p
p
0
0
1
r
o
t
s
i
s
e
R
/
g
n
i
t
a
R
r
e
w
o
P
W
m
0
0
1
e
g
n
a
R
e
r
u
t
a
r
e
p
m
e
T
g
n
i
t
a
r
e
p
O
C
5
8
o
t
C
0
4
Typical Solder Reflow Thermal Profile (No Clean Flux)
250
225
200
175
150
125
100
75
50
25
0
48
97
145
Time (s)
T
e
mperature (
o
C)
194
242
290
339
387
435
EXH
RF
Z5
Z4
EXH
PH
Z2
Z3
CD
2000 California Micro Devices Corp. All rights reserved.
7/21/2000
215 Topaz Street, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com
4
CSPDDR100
CALIFORNIA MICRO DEVICES
Applications
The CSPDDR100, Chip Scale DDR Termination Array,
provides sixteen (16) channels of series/parallel termi-
nation for SSTL termination applications such as DDR
memory systems. SSTL is the bus standard for DDR
SDRAM systems. Applying terminating resistors to DDR
SDRAM's interconnections is a necessity to avoid signal
integrity problems in the memory system's operation.
Improper or no termination on an interconnection that is
a transmission line will cause reflections which in turn
will affect the performance of the system due to ringing,
delays, exceeding IC voltage specifications, or
crosstalk. [1]
SSTL has four possible configurations. One of them
calls for both a series termination resistor and a parallel
termination at one end of the bus, as shown in Figure 1.
This is the application that the CSPDDR100 satisfies.
When a full level signal is sent down the transmission
line and no reflection is desired, the parallel load
resistance should equal the characteristic impedance
(Z
0
) of the transmission line. When a less than full level
signal is sent down a transmission line, it is desirable to
have an intentional mismatch of the parallel termination
load resistor so that the higher level reflection voltage
(resulting from having R
T
> Z
0
) raises the signal to the
full signal level so that load switching occurs in only one
propagation delay time. The use of a series termination
resistor at the source enables the sending of a reduced
level signal on the first incident wave. A reduced level
signal is beneficial in reducing rise times and EMI.
The values of the resistors for DDR/SSTL terminations
are user determined. If values different from the ones in
the CSPDDR100 specification are desired, please
contact California Micro Devices for quotations on other
values.
[1] James Sutherland, "Understanding Transmission Lines, and
High Speed Terminations", EDN, October 9, 1999
Figure 1. SSTL_2 Class II,
Symmetrically Double Parallel Terminated Output Load with Series Resistor
R
SERIES
V
REF
= 0.5 x V
DDQ
V
IN
+
V
OUT
R
T
= 50
R
T
= 50
V
TT
= 0.5 x V
DDQ
V
TT
= 0.5 x V
DDQ
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