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DDR 3 PCB: The Ultimate FAQ Guide

If you have any question on DDR 3 PCB, you will find the answer right here.

This guide covers everything you need to know about DDR 3 PCB – from specifications, features, surface finishing to structure.

You will find all information you are looking for in this guide.

Keep reading to learn more.

What Is DDR 3 PCB?

The DDR 3 PCB is a third generation memory chip of the synchronous dynamic RAM PCB.

The DDR 3 PCB offers you superior performance advantages over its predecessors the DDR 2 and DDR 1. With the DDR 3 PCB, you benefit from data transfer speeds of over eight hundred megabits per second.

DDR refers to double data rate which attributes to a class of RAM PCBs with enhance data transfer speeds.

Using a RAM chip with DDR capability provides you more precise clock signal and electrical data timing.

DDR technology employs various strategies to achieve the needed timing accuracy like phase-locked loops and self-calibration.


 In doubling the data bus bandwidth without increasing clock frequency, the interface employs double pumping.

Double pumping refers to the transfer of data over both the clock signal’s rising and falling edges. Therefore, you note that the DDR 3 PCB has three times the doubling pumping capacity of a DDR 1 PCB.

Lowering the clock frequency has the benefit of reducing the requirements of signal integrity on the memory to controller circuit board.

What Technology Preceded The DDR 3 PCB?

Before the DDR 3 PCB, there was the DDR 2 which is the second generation memory class.

The DDR 2 offered significant performance boost over the DDR 1 running the external bus twice as quickly.

DDR 2 PCB offered increased sophistication than the DDR 1 with its memory cells capable of communication with an external bus.

The DDR 2 transfers data at double the clock speed just like DDR 1, except its bus is twice as fast.

Interface modifications, like employing off-chip drivers and pre-fetch buffers, allows you to achieve the boost in clock speed.

However, you experience twice a DDR 1’s latency by employing buffers, necessitating twice the speed of the bus speed in compensation.

The DDR 3 PCBs cost more than their DDR 2 predecessors due to the added circuitry and more stringent packaging needs.

The DDR 3 lowers the voltage supply requirement thus reducing the chip’s power consumption.

Employing a lower voltage of operation also improves running speed aside from reducing power consumption.

The DDR 3 PCB can transition between high and low statuses faster for similar slew rate thanks to less voltage swing.

Furthermore, the DDR 3 can set the data strobe to operate in differential mode.

Consequently, you reduce crosstalk, electromagnetic interference, noise and dynamic power consumption when you employ a differential signal.

What Are The Features Of A DDR 3 PCB?

You derive several advantages from employing the DDR 3 PCB over earlier generations. Some notable features of the DDR 3 PCB include:

  • DQ Line Impedance: While the DDR 2 line impedance is 18 ohms, the DDR 3 PCB’s is 34 ohms.
  • Higher Data Speeds: With a 400 MHz clock rate, the DDR 3 PCB delivers data speeds from 800 Mbps foe every pin.
  • Lower Supply Voltage: Compared to the DDR 2’s 1.8 volts, the supply voltage of the DDR 3 PCB is 1.5 volts.
  • Lower Power Consumption: Just lowering the voltage supply by a 0.69 factor decreases the equivalent chip power consumption.
  • Memory Capacity: The DDR 3 PCB has memory capacities ranging from 512 Mb to 8 Gb.
  • Memory Configurations: Like its predecessors, the DDR 3 PCB provides data output formats of x4, x8, and x16, but with eight banks.
  • Mode Registers: You have four mode registers in DDR 3 PCBs unlike the DDR 2 which only utilized two.
  • On-Die Termination (ODT): ODT allows for the application of proper terminations directly to the chip.
  • Packages and Pins: You can employ surface mounting with the DDR 3 PCB such as the BGA (Ball Grid Array).
  • Pre-fetch Buffer: In DDR 3 PCBs, the pre-fetch buffer rose to 8 bits, resulting in faster operation. The architecture allows the transfer of eight data words in four clock cycles.

What Is The Pin Count In A DDR 3 PCB?

The DDR 3 PCB offered considerable performance improvements resulting in extensive usage.

It allowed processors and computers to run at higher speeds, matching the performance gains made by other system parts.

A DDR 3 PCB has a total of 240 pins similar to the DDR 2 but with different notch/key locations. Consequently, you cannot interchange the two PCBs.

How Does The DDR 3 PCB Compare To The DDR 4 PCB?

The DDR 4 PCB is the fourth generation of the DDR memory class introducing novel features resulting in enhanced performance boost.



The performance of DDR 4 PCB improves on that of the DDR 3 PCB with the following key features.

  • Data Width: You have three data width options with the DDR 4 PCB: x4, x8, and x16.
  • Differential Signaling: You find differential signaling applicable on the clock and strobe lines of the DDR 4 PCB.
  • DQ Bus: You have a pseudo interface with open drain on the DQ bus as a novel introduction in the DDR 4 PCB.
  • Internal Databanks: The DDR 4 PCB has 16 internal banks while you can have 8 ranks for each DIMM.
  • Operating Voltage: DDR 4 PCBs operate on a supply of 1.2 V with a word line auxiliary value of 2.5 V. For the DDR 3 PCB, supply voltage is at 1.5 V.
  • Pre-fetch: An 8n pre-fetch with two to four bank groups is standard in the DDR 4 PCB design increasing efficiency and memory bandwidth.

You therefore find the DDR 4 PCB can perform, in each bank group, read, write, refresh and distinct activation operations.

  • Protocol Revisions: Some of the revisions made on the DDR 4 PCB include:
  • Command/address bus parity.
  • On the data bus, there’s CRC.
  • Independent chip programming for finer on-die closure.
  • Inversion of the data bus.
  • Rates of Data: With the DDR 3 PCB, you can reach a data throughput of 1.6 Gbps for each pin. However, with a DDR 4 PCB, you can achieve speeds of over 3.2 Gbps.

How Is The DDR 3 PCB Control Signal Operation?

The timing and operation of the control signals is critical since the DDR 3 PCB operates in a synchronous mode.

You identify numerous advantages of the DDR 3 PCB in terms of speed and operation.

The smooth operation of the DDR 3 PCB is dependent on the control signals’ timing and operation.

You have to appropriately manage the control line timing for successful operation of the DDR 3 PCB.

The DDR 3 PCB is a synchronous dynamic random access memory type with commands harmonized to the clock’s rising edge.

The memory can take a number of different activities influenced by the command signal’s state of the clock’s rising edges.

You find the following control signals useful in the operation of a DDR 3 PCB:

  • Chip Select (CS): When you utilize many chips together, the CS permits activation of a particular DDR 3 PCB.

Usually the DDR 3 overlooks other inputs upon activation of this line save for the CE.

  • Clock Enable (CE): At a low state the DDR 3 PCB deactivates upon a clock cycle completion.

Thus, there is no interpretation of commands regardless of other line status. Upon enabling to a high state, the DDR 3 PCB activates on the clock’s rising edge.

  • Column Address Strobe (CAS): This control line, together with /RAS and /WE, implements a command out of eight total.
  • Data Mask: This line represses input or output data when active. You have one of this lines for every 8 bits for a chip rated x16.
  • Row Address Strobe (RAS): When activated alongside the column address strobe it allows the pursuit of one instruction from a pool of eight.
  • Write Enable (WE): You employ this line alongside the row and column address strobes to differentiate read-only and write-only instructions.

What Are Some Of The Commands You Can Send In A DDR 3 PCB?

There are a plethora of instructions you can send in a DDR 3 PCB usually employed as a set during operation.

You can find the following commands in a typical sequence:

  • Activate: This instructs the DDR 3 PCB to enable a row via activation of a row address.
  • Deselect Commands: You find these commands necessary for timing implications in a DDR 3 PCB operation.
  • Pre-charge: You require this command to deactivate a row prior to the opening of a new one.
  • Read or Write: You send this instruction alongside the column address with many read or write instructions possible on an active row.

Deactivation of new rows is unnecessary allowing for faster operations.

What Timings Do You Find Viable In A DDR 3 PCB?

A DDR 3 PCB utilizes the system’s timing to accomplish more efficient time management making it a critical feature.

This allows the DDR 3 PCB to interface with the processor’s timing and work effectively as a result.

The primary controls and timing factors for the DDR 3 PCB are as follows:

  • CAS Latency: This is the period between activation of a column address and registering of a response.

The DDR 3 PCB’s mode register holds the latency program which you define as clock cycle counts with the controller aware.

  • Read Cycle Time: The duration between two consecutive read operations when a row is active defines the read cycle time.

What Is The Structure Of A DDR 3 PCB?

When you get the architecture of a DDR 3 PCB, you are sure to get its working.

There are several variances across manufacturers’ implementations, although there are numerous areas of overlap.

It is generally beneficial to have a rudimentary comprehension of the DD 3 PCB architecture when employing it.

The design of the DDR 3 PCB influences its construction with crucial aspects such as memory cell location and control circuitry.

You have the memory cells arranged in rows and columns in the DDR 3 PCB chip design.

When addressing a specific cell, you highlight the needed row first, followed by the column typically contained within the row.

You refer to a row in a DDR 3 PCB as a page. You can highlight several addresses of the column in an open row.

Since you don’t need to re-send and establish the row address every time, you increase access speed memory thus reducing latency.

It takes time to open the row each time. Consequently, you find the address of the row assigned higher order with column addresses as the lower order.

Reasons like sequential column elements addressing upon row opening contribute to individual transmission of the row and column elements.

Therefore, you multiplex both addresses into similar lines, resulting in a lower pin count for packages and thus cost.

However, you note the address of the row is larger than the column address.

You find this is because the row number relates to the chip’s power and not the column number.

How Do You Configure A DDR 3 PCB?

One element of the DDR 3 PCB design is its circuit architecture which varies depending on the manufacturer.

You find configuration of the DDR 3 PCB in the following two major parts:

  • Array: This is the portion of the DDR 3 PCB where you find the memory cells.

The array configuration is in several banks, each of which consists smaller regions known as segments.

  • Periphery: You find the control and addressing circuits, sensing amplifiers and line drivers in the periphery.

Furthermore, the periphery divides the segments from array banks.

You can determine the fraction of the general area occupied by the actual memory by identifying the array and the periphery.

You refer to this as the cell efficiency, however, the periphery influence whatsoever on memory size.

What Components Do You Find In A DDR 3 PCB?

DDR 3 PCBs contain memory cells consisting of transistors with their architecture varying depending on manufacturer and size.

Each memory cell in a DDR 3 PCB contains transistors without a capacitor thus requiring consistent power supply.

DDR 3 PCB components
DDR 3 PCB components

You find thousands of memory cells in a DDR 3 PCB arranged in columns and rows.

Each cell finds use in the storage of a singular memory bit and can have four or six transistors.

Can You Employ Surface Finishes For The DDR 3 PCB?

Yes, you can.

A surface finish protects the bare copper of a DDR 3 PCB from corrosion while also extending its shelf life.

Some common surface finishes you employ on a DDR 3 PCB include, HASL, immersion tin and silver and ENIG.

You find surface finish on a DDR 3 PCB important in the following ways:

  • Improves the quality of solder joint.
  • You can rework finished surfaces.
  • You improve the testing process of the board when you apply a surface finish.
  • Using a surface finish reduces chance of board failure from interrupted connections.
  • A surface finish improves the shelf-life of the DDR 3 PCB.

Where Do You Find Use Of A DDR 3 PCB?

A DDR 3 PCB is a memory circuit board that allows you quick access and storage of data.

You find the DDR 3 PCB allows faster speeds of data transfer finding use in several applications as follows:

  • Central processing units employ DDR 3 PCBs as cache memory.
  • Digital cameras, digital-to-analog converters all employ DDR 3 PCBs.
  • Personal computers including notebooks and laptops employ DDR 3 PCBs for memory.
  • Networking and video equipment.
  • Video game consoles

Can You Replace A DDR 3 PCB?

Yes, you can.

The procedure for upgrading the DDR 3 PCB differs depending on the device, memory type, and amount. Following these steps will allow you to update your DDR 3 PCB:

  • Check to determine if you can replace the DDR 3 PCB on your device may. It’s possible to replace the PCB where you have an open socket with simple access.
  • You can improve the performance of your DDR 3 PCB by upgrading after assessing your memory needs.
  • Check the DDR 3 PCB restrictions in relation to the operating system and the motherboard. Count the DDR 3 slots on the motherboard and search the internet for the operating system’s support aspects.
  • Determine the capacity of the DDR 3 PCB which is subject to your envisioned use and your device’s maximum capacity.

What Cell Types Do You Find In A DDR 3 PCB?

A DDR 3 PCB stores data in memory cells you find configured in arrays of columns and rows. You have three primary types of DDR 3 PCB cells as follows:

  • 4T Cell: Contains a double pair of NMOS transistors and poly load resistors.

Pass transistors and cross-coupled inverters control the transistors and poly-load resistors respectively.

  • The 6T Cell: This cell has four NMOS and two PMOS transistors totaling six hence the name. You find the PMOS transistors employed for load.
  • Thin Film Transistor Cell: The TFT consists four NMOS transistors alongside PMOS transistors for load with thin film design.

What Capacities Can A DDR 3 PCB Support?

The DDR 3 PCB size appropriate for your device should correspond to your device and intended use.

You can have DDR 3 PCB capacities ranging from 4 GB to 32 GB with the former offering you minimum capability.

For instance, an 8 GB DDR 3 PCB supports medium application usage such as editing videos and using design software.

The 16 GB and 32 GB DDR 3 PCB are sufficient for heavy or complex applications with impressively fast refresh rates.

What Are The Considerations In Selecting A DDR 3 PCB?

Choosing a DDR 3 PCB for your application influences your success in performance. It is pivotal to consider the following when making your choice:

  • Interface: The compatibility of your DDR 3 PCB and device stems from its interface.

For instance, where you had an earlier generation memory chip you cannot employ a DDR 3 PCB.

  • Capacity: When carrying out basic applications such as light editing and writing, a low capacity DDR 3 PCB is sufficient.

However, large and heavy applications such as video games and editing require large capacity DDR 3 PCBs.

  • Timing: Timing is an important aspect of your device’s performance influenced by the DDR 3 PCB’s latency.

Latency defines the clock cycles upon completion of a read operation with a low latency indicating superior performance.

  • Frequency: You have to match the frequency of your DDR 3 PCB to that of your device’s main board for seamless operation.

While a DDR 3 PCB with higher frequency than the board can work, one with lower frequency attributes to poor performance.

For all your DDR 3 PCBs, contact us now.

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