LAPIS Semiconductor Co., Ltd.

LAPIS Semiconductor Co., Ltd. adopts CloudTesting™ Service for demonstration of SDRAM equipped with output drivability adjustment function

LAPIS Semiconductor Co., Ltd. exhibited their high reliability SDRAMs at CAR-ELE JAPAN that was held from January 13 to January 15, 2016. On this exhibition, the CloudTesting™ Station CX1000D was used for demonstration of their SDRAM setup.

Appearance of Demonstration
Appearance of Demonstration

Overview of high reliability SDRAMs

Main specifications

Data Rate SDR
Power Supply Voltage 3.3±0.3 (V)
Memory Size 16Mbit – 256Mbit
Data Bit 16
Package TSOP(Ⅱ)50Cu or TSOP(Ⅱ)54Cu (depend on product)

Key features of high reliability legacy SDRAMs

~What is output drivability adjustment function?

A DIMM comprises a series of SDRAMs, which consists of high driving capabilities in computing environments to send and receive data.

Recently, controller and SDRAM are often connected on a one-to-one basis. A load of such transmission lines is low compared to traditional SDRAM applications. If SDRAM, which has driving capability, is connected to such low load environment, it will cause ringing and radiant noise. Therefore, users have to connect SDRAM via dumping resistor or place components on their product for EMI prevention.

LAPIS semiconductor’s high reliability legacy SDRAMs has an output drivability adjustment function that changes the current drive capability during read data output in 4 stages; 12.5%, 25%, 50% and 100%. The drivability can be changed by setting an extended mode register. By this function, dumping resistor and components for EMI prevention are no longer required so that cost and mounting area for SDRAM can be reduced.


SDRAM’s connection to CX1000D changes the value of the SDRAM’s extended mode register. As a result, the oscilloscope shows a different waveform output from the SDRAM.

Panel which describes overview and configuration of demonstration
Panel describes demonstration overview and configuration

Oscilloscope displaying output waveform of each drivability
Oscilloscope displaying output waveform of each drivability

Participants saw the waveform of each drivability displayed on the oscilloscope and confirmed that the ringing was reduced by decreasing the drivability.

For more detail, please contact LAPIS Semiconductor Co., Ltd.(

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