Winbond Pseudo SRAM for Wearables

By WPG AmericasSeptember 24, 2017

This article was originally authored by Fely Krewell, Business Development Manager at Winbond.

Pseudo SRAM (PSRAM) devices are experiencing a design revival with the adoption of wearable devices. Also known as CellularRAMTM, PSRAM were widely used in feature mobile phones. A typical IoT wearable design requires low power for extended battery life and the use of lower RAM density in the smallest possible packages. Most wearables are tasked to monitor a finite set of parameters which means not a lot of computing power is needed, nor is a large memory size. These design requirements make Winbond PSRAM a natural choice for wearable applications.

It is not surprising that connected IoT wearables chose a mature technology driven by mobile devices for the best value. Winbond offers a variety of PSRAM densities from 32 Megabit to 256 Megabit in BGA packages.

Winbond’s PSRAM Product Features

  • Broad density offering from 32 Megabit to 256 Megabit
  • Operating voltage range: 1.7V to 1.9V
  • Memory organization: x16
  • 133 MHz Clock Rate
  • 70 ns Random Access Time
  • Option for Address Data Multiplex (ADM) to take advantage of less pins or Address Data Parallel (ADP)
  • Standard 54 BGA for all densities, 49 BGA for 64 Megabit only

Winbond is the market leader for PSRAM shipments. The 64 Megabit featured device, W956D6KBKX7I, is available in a thin, low pin count, 49 ball BGA. Compared to the size of a penny, the tiny package is ideal for wrist-type wearables like smartwatches, activity trackers and health monitoring devices.

The 1.8V low power device includes a deep, power down sleep mode which help to extend the IoT device’s battery life. Additional features that support less overall power consumption include partial-array self-refresh and configurable drive strengths of ½ and ¼ strength.

For more information about Winbond’s Pseudo SRAM products, download their Selector Guide and contact a WPG Americas Storage Specialist.