Single Output
DDR Series
Features
9 Amp Active Power Terminator
For DDR Memories
Figure 1. Simplified Schematic
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DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 · Email: sales@datel.com · Internet: www.datel.com
PRELIMINARY
For high performance termination of
DDR computer memory busses
Compatible to JEDEC JESD 79 and 8-9
DDR specifications
Ideal for active wideband termination of
SSTL-2 logic
Non-isolated design with 1.25V typ. @
±9 Amps output
3-5.5V input with 85% (typ.) efficiency
Miniature industry standard 1.6 x 0.5 x
0.2 inch surface mount or SIP package
Offers unique source/sink DDR require-
ments plus automatic reference tracking
Retains controlled impedances and
minimizes distortion of DDR digital data
and double-side clocks
Operates over –40 to +65°C with
200 lfm airflow
Standard vertical mount, optional
horizontal mount
Designed for efficient termination of SSTL-2 (Series Stub Terminated Logic)
signals in DDR (Dual Data Rate) memories, the DDR series non-isolated DC/DC
converters are powered by the bus supply of 3 to 5.5 Volts and are compatible to
industry-standard JEDEC JESD specifications for DDR memories. The DDR termi-
nators are supplied in a 1.6 by 0.5 inch surface-mount or SIP package measuring
only 0.2 inches high. Full output power (3.3VIN) is available up to +65°Celsius with
only 200 LFM (linear feet per minute) of cooling airflow. No heatsink is required.
Modern SSTL-2 logic uses reduced power voltages (typically 2.5 Volts), high
switching currents and a relatively narrow voltage threshold window for logic switch-
ing. These factors contribute to the 266MHz data transfer rate. The Vtt termination
voltage output of the DDR operates approximately at the midpoint voltage of the bus
(i.e, about 1.25V) and therefore will either source or sink current up to 9 Amps. To
maintain a reliable window in the logic threshold, the design tracks the Vref input volt-
age at high bandwidth, operating typically at one half the bus Vddq voltage of 2.5V. In
addition, the DDR series features a very high current slew rate of up to 40 Amps per
microsecond and fast settling while switching from source to sink or sink to source.
These features insure no data errors on the memory bus.
The DDR is supplied either in a vertical SIP (Single Inline Package) mount or
a horizontal pinned mount. The converter meets UL 60950, CSA and IEC safety
certifications and both conducted and radiated EMI (electromagnetic interference)
specifications. The output is rated for continuous short circuit protection and the on-
board controller will shut down the converter if the temperature reaches 110°C or
output current exceeds 11 Amps.
OVER
TEMPERATURE
REMOTE
ON/OFF IN
(3)
COMMON
(9, 10)
CONTROLLER +VOUT
(11, 12, 13)
SIGNAL
GROUND
+SENSE IN
(1)
–SENSE IN
(2)
+VIN
VREF
INPUT
(14)
(4, 5, 6)
COMMON
(7, 8)
®®
A SUBSIDIARY OF C&D TECHNOLOGIES
DDR Series 9 AMP ACTIVE POWER TERMINATOR
2
MECHANICAL SPECIFICATIONS
Pin Function P66 Pin Function P66
1 +Sense Input 8 Common
2 –Sense Input 9 Common
3 On/Off Input 10 Common
4 +Input 11 –Output
5 +Input 12 –Output
6 +Input 13 –Output
7 Common 14 VREF Input
I/O Connections
DDR
ACTIVE
TERMINATOR
COM COM
–SENSE
+SENSE
25Ω
REMOTE
ON/OFF
VREF
VIN
VDDQ
(2.5V) VCC
(3 to 5.5V)
VOUT
VTT = ½VREF
Snubber Array
(192 lines,
typical)
DIMM
0
Memory Modules
DIMM
N
AGP
Graphics
PCI
Bus
CPU
MEMORY
CONTROLLER
Bus
Transceivers
Figure 2. DDR Memory Application
DIMENSIONS IN INCHES (MM)
Case B9
Case B10
DDR Models
9 AMP ACTIVE POWER TERMINATOR
3
Performance/Functional Specifications
Typical at TA = +25°C under nominal line voltage, VOUT = 1.25V, full-load conditions unless noted.
Input
Input Voltage Range ➀ 3 to 5.5 Volts (3.3V nominal)
Start-Up Threshold 2 Volts min., 2.5 Volts typ.
Input Current, Current Sourcing Mode
At 3.3VIN, 1.25VOUT 4.15 Amps max.
At 3.3VIN, 0.9VOUT 3.18 Amps max.
At 5VIN, 1.25VOUT 2.75 Amps max.
At 5VIN, 0.9VOUT 2.13 Amps max.
Inrush Transient 0.003A2/sec, maximum
No-load Input Current 70mA typ., 100mA max.
Short Circuit Current 4 Amps
Shut Down Mode Input Current 7mA
Input Reflected Ripple Current ➁ 10mAp-p
VREF Input Range 0.7 to 1.45V
VREF External Reference Current 0.1µA (VREF min. to max., IOUT = ±9A)
Remote On/Off Control
+Positive Logic On = no connection, open collector or
0.8V to +VIN max. applied at 60µA.
Off = 0 to 0.7V or pulled low.
Remote Sense Range + 10% of VOUT
Output
Maximum Output Power 11.36 Watts (VREF = 1.25V)
Minimum Loading No minimum load
Maximum Capacitive Loading 2000µF, OSCON low-ESR (0.02Ω)
10,000µF (aluminum electrolytic)
Output Voltage Accuracy VREF ±1%
Total Accuracy (Line, Load, Temp.) ±5%
Output Current, Source +9.00 Amps maximum
Output Current, Sink –9.00 Amps maximum
Short Circuit Current 13 Amps
Short Circuit Duration Continuous, output shorted to ground
Short Circuit Protection Fold back technique, autorecovery
Current Limit Inception ➂ 11 Amps, sourcing mode
Transfer Characteristics
Efficiency, Current Sourcing Mode, 9A load
At 3.3VIN, 1.25VOUT 83% typ., 85% max.
At 3.3VIN, 0.9VOUT 78% typ., 80% max.
At 5VIN, 1.25VOUT 82.5% typ., 84.5% max.
At 5VIN, 0.9VOUT 77% typ., 79% max.
Efficiency, Current Sinking Mode, 9A load
At 3.3VIN, 1.25VOUT 81% typ., 83% max.
At 3.3VIN, 0.9VOUT 74.5% typ., 76.5% max.
At 5VIN, 1.25VOUT 80% typ., 82% max.
At 5VIN, 0.9VOUT 73.5% typ., 75.5% max.
Temperature Coefficient ±0.02%/°C
Switching Frequency 550kHz min., 700kHz max.
Line Regulation (VIN = min. to max.) ±0.75%
Load Regulation (VIN = min. to max.) ±1.5%
Dynamic Characteristics
Output Slew Rate 40 Amps/µsec
Load Step, 0 to 9A 175mV, peak deviation
Load Step Settling Time, 0 to 9A 200µsec
Ripple and Noise, 20 MHz bandwidth 40mVp-p, typical
60mVp-p, maximum
Turn-On Time (Remote On/Off
or VIN to VOUT regulated) 5.5msec
Absolute Maximum Ratings
Input Voltage 7Vdc max., 100msec duration
Input Reverse Polarity None
Output Current Current-limited. Device can
withstand indefinite short circuit.
Storage Temperature –55 to +125 °C
Lead Temperature +300°C, 10 seconds maximum
Absolute maximums are stress ratings. Exposure of devices to any of these conditions
may adversely affect long-term reliability. Proper operation under conditions other than
those listed in the Performance/Functional Specifications Table is not implied nor recom-
mended.
➀ See Absolute Maximum Ratings for allowable input voltage.
➁ Input Ripple Current is tested and specified over a 5-20 MHz bandwidth. Input filtering is
CIN = 200µF, CBUS = 1000µF, LBUS = 1µH.
➂ Current limit inception is given at either cold start-up or after warm-up for VREF = 0.9 or 1.25V.
➃ Mean Time Before Failure is calculated using the Telecordia (Bellcore) SR-332 Method 1,
Case 3, ground fixed conditions, TCASE = +40°C, Full load.
Ordering Guide
Model Number Mounting
DDR-9-W3 Single Inline Package (vertical)
DDR-9-W3H Horizontal mount
Environmental
Operating Temperature Range (Ambient)
No derating, vertical mount –40 to +65°C @ 200 lfm airflow
Derating See derating curves
PCB/Case Temperature Range –40 to +100°C, no derating.
Thermal Protection/Shutdown 110°C
Storage Temperature Range –55 to +125°C
Altitude 0 to 10,000 feet
Relative Humidity 10% to 90%, non-condensing
Physical, Safety
Outline Dimensions 1.60 x 0.50 x 0.20 inches
40.64 x 12.7 x 5.08mm
Weight 0.25 ounces (7g)
Pin Material Nickel plate over copper alloy
Pin Dimensions 0.02 inches (0.508mm)
Calculated MTBF ➃ TBD hours
Electromagnetic Interference Conducted (FCC part 15, EN55055)
Radiated (FCC part 15, EN55055)
Safety UL/cUL 60950, CSA-C22.2 No.234
IEC/EN 60950
DDR Series 9 AMP ACTIVE POWER TERMINATOR
Typical Performance Curves
86
84
82
80
78
76
74
72
70
DDR-9-W3
Efficiency vs. Load Current (Current Sinking Mode, VOUT = 0.9V)
–1 –3 –5 –7 –9
Load Current (Amps)
Efficiency (%)
V
IN
= 3.3V
V
IN
= 5V
89
87
85
83
81
79
77
75
DDR-9-W3
Efficiency vs. Load Current (Current Sinking Mode, VOUT = 1.25V)
–1 –3 –5 –7 –9
Load Current (Amps)
Efficiency (%)
V
IN
= 3.3V
V
IN
= 5V
4
DDR Models
9 AMP ACTIVE POWER TERMINATOR
Typical Performance Curves
–40 0 15 25 35 45 55 65 75 85 95 105 115 125
DDR-9-W3 Maximum Current Temperature Derating
(3.3VIN, 0.9VOUT, Current Sourcing Mode)
Output Current (Amps)
Ambient Temperature (°C)
10
9
8
7
6
5
4
3
2
1
0
100 lfm
400 lfm
200 lfm
300 lfm
0 lfm Airflow
–40 0 15 25 35 45 55 65 75 85 95 105 115 125
DDR-9-W3 Maximum Current Temperature Derating
(5VIN, 0.9VOUT, Current Sourcing Mode)
Output Current (Amps)
Ambient Temperature (°C)
10
9
8
7
6
5
4
3
2
1
0
100 lfm
400 lfm
200 lfm
300 lfm
0 lfm Airflow
–40 0 15 25 35 45 55 65 75 85 95 105 115 125
DDR-9-W3 Maximum Current Temperature Derating
(3.3VIN, 1.25VOUT, Current Sourcing Mode)
Output Current (Amps)
Ambient Temperature (°C)
10
9
8
7
6
5
4
3
2
1
0
100 lfm
400 lfm
200 lfm
300 lfm
0 lfm Airflow
–40 0 15 25 35 45 55 65 75 85 95 105 115 125
DDR-9-W3 Maximum Current Temperature Derating
(5VIN, 1.25VOUT, Current Sourcing Mode)
Output Current (Amps)
Ambient Temperature (°C)
10
9
8
7
6
5
4
3
2
1
0
100 lfm
400 lfm
200 lfm
0 lfm Airflow
300 lfm
DS-0543 7/04
5
DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein
do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444
Internet: www.datel-europe.com E-mail: datel.ltd@datel.com
DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01
Internet: www.datel-europe.com E-mail: datel.sarl@datel.com
DATEL GmbH München, Germany Tel: 89-544334-0
Internet: www.datel-europe.com E-mail: datel.gmbh@datel.com
DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-6354-2025
Internet: www.datel.co.jp Email: salestko@datel.co.jp, salesosa@datel.co.jp
DATEL China Shanghai, China Tel: 011-86-51317131
E-mail: davidx@datel.com
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151
Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.datel.com Email: sales@datel.com
www.cdpowerelectronics.com
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