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240 pin DDR2 & DDR3

A dual inline memory module (DIMM) consists of a number of memory components attached to a printed circuit board. The gold pins on the bottom of the DIMM provide a connection between the module and a socket on a printed circuit board. The pins on the front and back of a DIMM are not connected to each other.

DDR2 SDRAM use 240-pin DIMM sockets for desktop computers. Each 240-pin DIMM provides a 64-bit data path (72-bit for ECC or registered modules), so they are installed one at a time in 64-bit systems. DDR2 chipsets are expected to support dual-channel memory, providing a 128-bit data path.

240-pin DIMMs are available in DDR2 or DDR3 SDRAM.

Memory modules (Unbuffered, Registered, Small Outline DIMMs) have a special “key” or notch in their connector. These keys must align with a key in the memory socket to allow the module to be inserted. All DDR3 and DDR2 module types are keyed differently.

To use DDR2 memory, your system motherboard must have 240-pin DIMM slots and a DDR2-enabled chipset. A DDR2 SDRAM DIMM will not fit into a standard SDRAM DIMM socket or a DDR DIMM socket. DDR2 modules use a 1.8V power supply, providing a big power saving over the 2.5V DDR modules.

To use DDR3 memory, your system motherboard must have 240-pin DIMM slots and a DDR3-enabled chipset. A DDR3 SDRAM DIMM will not fit into a standard SDRAM DIMM socket, DDR DIMM socket or DDR2 socket. DDR3 modules use a 1.5V power supply, providing a big power saving over the 2.5V DDR modules or 1.8V DDR2 modules. DDR3 is the next generation of Double Data Rate (DDR) Synchronous Dynamic Random Access Memory (SDRAM). It is an evolution of DDR and DDR2 memory technology that delivers higher speeds, lower power consumption and heat dissipation.

The number of components on a 240-pin DIMM may vary, but they always have 120 pins on the front and 120 pins on the back. 240-pin DIMMs are approximately 5.25" long and 1.18" high, though the heights may vary. While 240-pin DDR2 DIMMs, 184-pin DDR DIMMs and 168-pin DIMMs are approximately the same size, 240-pin DIMMs and 184-pin DIMMs have only one notch within the row of pins. The notch in a 240-pin DDR2 DIMM is slightly more toward the center of the module.

DDR2 Performance range:
        200Mhz (5.0ns @CL=3)
        267MHz (3.75ns@CL=4)
. Power supply: VDD:1.8V±0.1V
. Bi-directional data strobe (DQS)
. Differential clock inputs (CK and CK#)
. DLL aligns DQ and DQS transition with CK transition
. Auto & self refresh capability (8192 Cycles / 64ms)
. Double-data-rate architecture; two data transfers per clock cycle
. Programmable Read latency: 3 and 4 (clock)
. Programmable Burst length: 4 or 8
. Programmable Burst type (Sequential & Interleave)
. Edge aligned data output, center aligned data input
. Serial presence detect with EEPROM
 

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