Products > Integrated Circuits (ICs) > Memory > KM428C256J-6

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256K X8 Bit CMOS Video RAM

  • Package/Case :
  • SOJ-40
  • Product Categories :
  • Memory
  • RoHs Status:
  • Lead free / RoHS Compliant
  • In-stock:
  • 126


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KM428C256J-6 Product Details


The Samsung KM428C256 is a CMOS 256Kx 8 bit Dual Port DRAM. It consists of a 256Kx 8 dynamic random access memory(RAM) port and 512x 8 static serial access memory (SAM) port. The RAM and SAM ports operate asynchronously except during data transfer between the ports.

The RAM array consists of 512 bit rows of 4096 bits.It operates like a conventional 256K× 8 CMOS DRAM.
The RAM port has a write per bit mask capability.Data may be written with New Mask. The RAM port has a Fast Page mode access, Block Write and Flash Write capability.

The SAM port consists of eight 512 bit high speed shiftregisters that are connected to the RAM array through a
4096 bit data transfer gate.The SAM port has serial read and write capabilities.

Data may be internally transferred bi-directionally between the RAM and SAM ports using read, write Split Transfers or normal Read/Write Transfer.
Refresh is accomplished by familiar DRAM refresh modes.The KM428C256 supports RAS-only, Hidden, and CAS
-before-RAS refresh for the RAM port. The SAM port does not require refresh.
All inputs and I/O's are TTL level compatible. All address lines and data inputs are latched on chip to simplify system design. The outputs are unlatched to allow greater system flexibility.

·Dual port Architecture
  256Kx8 bits RAM port
  512×8bits SAM port
·Performance range:
·Fast Page Mode
·RAM Read,Write,Read-Modity-Write
·Serial Read(SR)and Serial Write(SW)
·Read/Real time read transfer(RT,RRT)
·Split Read Transfer with Stop Operation (SRT)
·Write and Split Write Transfer(New Mask),(WT,SWT)
·Block Write (BW),Flash Write (FLW)and Write-per-Bit with Masking Operation(New Mask) CAS-before-RAS,RAS-     only and Hidden Refresh
·Common Data /O Using three state RAM Output control
·All Inputs and Outputs TTL Compatible
·Refresh:512 Cycle/8ms
·Plastic 40-Pin 400 mil SOJ
·Plastic 40/44-Pin 400 mil TSOP l(Forward and Reverse Type)


KM428C256J-6 Pinout
(Picture: Pinout)

KM428C256J-6 Block Diagram
(Picture: Diagram)

Technical Parameters

  • Manufacturer
  • Packing
  • Tape & Reel (TR)/Cut Tape (CT)/Tray/Tube
  • RoHs Status
  • Lead free / RoHS Compliant
  • Package/Case
  • SOJ-40

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Estimated Delivery Time: Sep 22 - Sep 27 days (choose Expedited at checkout).

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We provide high quality products, thoughtful service and after sale guarantee

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    We have rich products, can meet your various needs.

  • Minimum order quantity starts from 1pcs.

    Minimum order quantity starts from 1pcs.

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    Lowest international shipping fee starts from US$2.00.

  • 90 days quality guarantee for all products.

    90 days quality guarantee for all products.


  • Step1:Product

    Step1: Products

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    Step3: Anti-Static Bag

  • Step4:Individual packaging

    Step4: Individual Packaging

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    Step5: Packaging Boxes

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    Step6: Bar-Code Shipping Tag

All the products will packing in anti-staticbag. Ship with ESD antistatic protection.

Outside ESD packing’s lable will use ourcompany’s information: Part Mumber, Brand and Quantity.

We will inspect all the goods before shipment,ensure all the products at good condition and ensure the parts are new originalmatch datasheet.

After all the goods are ensure no problems afterpacking, we will packing safely and send by global express. It exhibitsexcellent puncture and tear resistance along with good seal integrity.

Jotrin ESD packing


1.We provide 90 days warranty.

2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.


Q: How does Jotrin guarantee that KM428C256J-6 is the original manufacturer or agent of SAMSUNG?
We have a professional business development department to strictly test and verify the qualifications of SAMSUNG original manufacturers and agents. All SAMSUNG suppliers must pass the qualification review before they can publish their KM428C256J-6 devices; we pay more attention to the channels and quality of KM428C256J-6 products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of KM428C256J-6 chips? Including SAMSUNG original factory information, application, KM428C256J-6 pictures?
You can use Jotrin's intelligent search engine, or filter by Memory category, or find it through Samsung Semiconductor, Inc Information page.
Q: Are the SAMSUNG's KM428C256J-6 price and stock displayed on the platform accurate?
The SAMSUNG's inventory fluctuates greatly and cannot be updated in time, it will be updated periodically within 24 hours. After submitting an order for KM428C256J-6, it is recommended to confirm the order with Jotrin salesperson or online customer service before payment.
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Yes. We accept offline orders.
We can provide order placement service. You only need to log in, click "My Orders" to enter the transaction management, and you will see the "Order Details" interface. After checking it, select all and click "Place Order". In addition, you can enjoy coupons or other selected gifts when placing orders online.
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TT Bank, Paypal, Credit Card, Western Union, and Escrow is all acceptable.
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Customers can choose industry-leading freight companies, including DHL, FedEx, UPS, TNT, and Registered Mail.
Once your order has been processed for shipment, our sales will send you an e-mail advising you of the shipping status and tracking number.
Note: It may take up to 24 hours before carriers will display tracking information. In normal conditions, Express delivery needs 3-5 days, Registered Mail needs 25-60 days.
Q: What is the process for returns or replacement of KM428C256J-6?
All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the KM428C256J6 we delivered, we will accept the replacement or return of the KM428C256J-6 only when all of the below conditions are fulfilled:
(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
(2)We are informed of the defect described above within 90 days after the delivery of KM428C256J-6.
(3)The KM428C256J-6 is unused and only in the original unpacked packaging.
Two processes to return the products:
(1)Inform us within 90 days
(2)Obtain Requesting Return Authorizations
More details about return electronic components please see our Return & Change Policy.
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Samsung Semiconductor, Inc

Samsung achieved and has held market leadership in DRAM and SRAM since the early 1990s, and in NAND Flash since 2003. In 2001, Samsung also signalled its long commitment to logic and analog chip development with the expansion of the System LSI Division and the opening of the SoC Research Lab....

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