Preliminary
PLL103-53
DDR SDRAM Buffer with 5 DDR or 3 SDR/3 DDR DIMMS
FEATURES
•
•
•
•
•
•
•
•
•
Generates 30-output buffers from one input.
Supports up to 4 DDR DIMMS or 3 SDR DIMMS
and 2 DDR DIMMS.
Supports 266MHz DDR SDRAM.
One additional output for feedback.
Less than 5ns delay.
Skew between any outputs is less than 100 ps.
2.5V or 3.3V Supply range.
Enhanced DDR and SDRAM Output Drive
selected by I2C.
Available in 56 pin SSOP.
PIN CONFIGURATION
FBOUT
VDD3.3_2.5
GND
DDR0T_SDRAM10
DDR0C_SDRAM11
DDR1T_SDRAM0
DDR1C_SDRAM1
VDD3.3_2.5
GND
DDR2T_SDRAM2
DDR2C_SDRAM3
VDD3.3_2.5
BUF_IN
GND
DDR3T_SDRAM4
DDR3C_SDRAM5
VDD3.3_2.5
GND
DDR4T_SDRAM6
DDR4C_SDRAM7
DDR5T_SDRAM8
DDR5C_SDRAM9
VDD3.3_2.5
SDATA
GND
VDD2.5
DDR12T
DDR12C
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
SEL_DDR
VDD2.5
GND
DDR11T
DDR11C
DDR10T
DDR10C
VDD2.5
GND
DDR9T
DDR9C
VDD2.5
PD#
GND
DDR8T
DDR8C
VDD2.5
GND
DDR7T
DDR7C
DDR6T
DDR6C
GND
SCLK
VDD2.5
GND
DDR13C
DDR13T
PLL103-53
Note:
#: Active Low
BLOCK DIAGRAM
DESCRIPTIONS
The PLL103-53 is designed as a 3.3V/2.5V buffer to
distribute high-speed clocks in PC applications. The
device has 30 outputs. These outputs can be
configured to support 4 unbuffered DDR (Double
Data Rate) DIMMS or to support 3 unbuffered
standard SDR (Single Data Rate) DIMMS and 2 DDR
DIMMS. The PLL103-53 can be used in conjunction
with the PLL202-14/-54 or similar clock synthesizer
for the VIA Pro 266 chipset.
The PLL103-53 also has an I2C interface, which can
enable or disable each output clock. When power up,
all output clocks are enabled (has internal pull up).
DDR0T_SDRAM10
SDATA
SCLK
I2C
Control
DDR0C_SDRAM11
DDR1T_SDRAM0
DDR1C_SDRAM1
DDR2T_SDRAM2
DDR2C_SDRAM3
DDR3T_SDRAM4
DDR3C_SDRAM5
DDR4T_SDRAM6
BUF_IN
DDR4C_SDRAM7
DDR5T_SDRAM8
DDR5C_SDRAM9
DDR(6:13)T
DDR(6:13)C
FBOUT
PD#
47745 Fremont Blvd., Fremont, California 94538 TEL (510) 492-0990 FAX (510) 492-0991
Rev 12/01/00 Page 1
Preliminary
PLL103-53
DDR SDRAM Buffer with 5 DDR or 3 SDR/3 DDR DIMMS
PIN DESCRIPTIONS
Name
FBOUT
BUF_IN
PD
Number
1
13
44
Type
O
I
I
Description
Feedback clock for chipset. Output voltage depends on VDD3.3_2.5V.
Reference input from chipset. 3.3V input for STANDARD SDRAM mode;
2.5V input for DDR-ONLY mode.
Power Down Control input. When low, it will tri-state all outputs.
SEL_DDR
56
I
Input configure for DDR-ONLY mode or STANDARD SDR mode.
1 = DDR-ONLY mode (when VDD3.3_2.5 select 2.5V);
0 = SDR mode (when VDD3.3_2.5 select 3.3V).
In DDR-ONLY mode, all outputs will be configured as DDR outputs.
In STANDARD SDR mode, pin 4, 5, 6, 7, 10, 11, 15, 16, 19, 20, 21
and 22 will be configured as STANDARD SDR outputs, and pin 27,
28, 29, 30, 35, 36, 37, 38, 41, 42, 46, 47, 50, 51,52 and 53 will be
configured as DDR outputs.
These outputs provide True copies of BUF_IN.
These outputs provide complementary copies of BUF_IN.
When SEL_DDR=1, these outputs provide DDR mode outputs; when
SEL_DDR=0, these outputs provide standard SDRAM mode outputs.
Voltage swing depends on VDD3.3_2.5.
When SEL_DDR=1, these outputs provide complementary copies of
BUF_IN; when SEL_DDR=0, these outputs provide standard SDRAM
mode outputs. Voltage swing depends on VDD3.3_2.5.
When VDD=2.5V, SEL_DDR=1. DDR-ONLY mode is selected; when
VDD=3.3V, SEL_DDR=0. STANDARD SDRAM mode is selected.
2.5V power supply.
Ground.
DDR[6:13]T
DDR[6:13]C
DDR[0,1:5]T_SDRA
M [10,0,2,4,6,8]
DDR[0,1:5]C_SDRA
M [11,1,3,5,7,9]
VDD3.3_2.5
VDD2.5
GND
36,38,42,47,
51,53,27,29
35,37,41,46,
50,52,28,30
4,6,10,15,
19,21
5,7,11,16,
20,22
2,8,12,17,23
32,40,45,
49,55
3,9,14,18,
25,31,34,39,
43,48,54
O
O
O
O
P
P
P
47745 Fremont Blvd., Fremont, California 94538 TEL (510) 492-0990 FAX (510) 492-0991
Rev 12/01/00 Page 2
Preliminary
PLL103-53
DDR SDRAM Buffer with 5 DDR or 3 SDR/3 DDR DIMMS
I2C BUS CONFIGURATION SETTING
Address Assignment
Slave
Receiver/Transmitter
Data Transfer Rate
A6
1
A5
1
A4
0
A3
1
A2
0
A1
0
A0
1
R/W
_
Provides both slave write and readback functionality
Standard mode at 100kbits/s
This serial protocol is designed to allow both blocks write and read from the controller. The
bytes must be accessed in sequential order from lowest to highest byte. Each byte transferred
must be followed by 1 acknowledge bit. A byte transferred without acknowledged bit will
terminate the transfer. The write or read block both begins with the master sending a slave
address and a write condition (0xD2) or a read condition (0xD3).
Following the acknowledge of this address byte, in
Write Mode:
the
Command Byte
and
Byte
Count Byte must be sent by the master
but ignored by the slave, in
Read Mode:
the
Byte
Count Byte
will be
read by the master
then all other
Data Byte. Byte Count Byte
default at
power-up is = (0x09).
Data Protocol
I2C CONTROL REGISTERS
1. BYTE 6: Outputs Register
(1=Enable, 0=Disable)
Bit
Bit 7
Bit 6
Bit 5
Pin#
56
-
-
Default
1
0
0
Description
SEL_DDR ( I2C is ready only, value is set through pin56 )
SDRAM Drive.
DDR Drive.
Bit6
Bit5
0
1
1
DDR Drive
Enhanced 25%
Normal
Normal
SDRAM Drive
Enhanced 25%
Normal
Enhanced 25%
X
0
1
Enhance Drive Control
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
27,28,29,30
53, 52
51, 50
47, 46
42, 41
1
1
1
1
1
DDR12T, DDR12C, DDR13T, DDR13C
DDR11T, DDR11C
DDR10T, DDR10C
DDR9T, DDR9C
DDR8T, DDR8C
47745 Fremont Blvd., Fremont, California 94538 TEL (510) 492-0990 FAX (510) 492-0991
Rev 12/01/00 Page 3
Preliminary
PLL103-53
DDR SDRAM Buffer with 5 DDR or 3 SDR/3 DDR DIMMS
2. BYTE 7: Outputs Register
(1=Enable, 0=Disable)
Bit
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Pin#
38, 37
36, 35
21, 22
19, 20
15, 16
10, 11
6, 7
4, 5
Default
1
1
1
1
1
1
1
1
Description
DDR7T, DDR7C
DDR6T, DDR6C
DDR5T_SDRAM8, DDR5C_SDRAM9
DDR4T_SDRAM6, DDR4C_SDRAM7
DDR3T_SDRAM4, DDR3C_SDRAM5
DDR2T_SDRAM2, DDR2C_SDRAM3
DDR1T_SDRAM0, DDR1C_SDRAM1
DDR0T_SDRAM10, DDR0C_SDRAM11
47745 Fremont Blvd., Fremont, California 94538 TEL (510) 492-0990 FAX (510) 492-0991
Rev 12/01/00 Page 4
Preliminary
PLL103-53
DDR SDRAM Buffer with 5 DDR or 3 SDR/3 DDR DIMMS
ELECTRICAL SPECIFICATIONS
1. Absolute Maximum Ratings
PARAMETERS
Supply Voltage
Input Voltage, dc
Output Voltage, dc
Storage Temperature
Ambient Operating Temperature
ESD Voltage
SYMBOL
V
DD
V
I
V
O
T
S
T
A
MIN.
V
SS
-
0.5
V
SS
-
0.5
V
SS
-
0.5
-65
0
MAX.
7.0
V
DD
+
0.5
V
DD
+
0.5
150
70
2
UNITS
V
V
V
°C
°C
KV
Exposure of the device under conditions beyond the limits specified by Maximum Ratings for extended periods may cause permanent damage to the
device and affect product reliability. These conditions represent a stress rating only, and functional operations of the device at these or any other
conditions above the operational limits noted in this specification is not implied.
2. Operating Conditions
PARAMETERS
Supply Voltage
Supply Voltage
Input Capacitance
Output Capacitance
SYMBOL
V
DD3.3
V
DD2.5
C
IN
C
OUT
MIN.
3.135
2.375
MAX.
3.465
2.625
5
6
UNITS
V
V
pF
pF
3. Electrical Specifications
PARAMETERS
Input High Voltage
Input Low Voltage
Input High Current
Input Low Current
Output High
Voltage
Output Low
Voltage
Output High
Current
Output Low
Current
Note:
TBM: To be measured
SYMBOL
V
IH
V
IL
I
IH
I
IL
V
OH
V
OL
I
OH
I
OL
CONDITIONS
All Inputs except I2C
All inputs except I2C
V
IN
= V
DD
V
IN
= 0
IOL = -12mA,
IOL = 12mA,
VDD = 2.375V
VDD = 2.375V
MIN.
2.0
V
SS
-0.3
TYP.
MAX.
V
DD
+0.3
0.8
TBM
TBM
UNITS
V
V
uA
uA
V
1.7
0.6
-18
26
-32
35
V
mA
mA
VDD = 2.375V, VOUT=1V
VDD = 2.375V, VOUT=1.2V
47745 Fremont Blvd., Fremont, California 94538 TEL (510) 492-0990 FAX (510) 492-0991
Rev 12/01/00 Page 5
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