CY15B256Q-SXA

The CY15B256Q is a 256-Kbit nonvolatile memory employing an advanced ferroelectric process. An F-RAM is nonvolatile and performs reads and writes similar to a RAM. It provides reliable data retention for 151 years while eliminating the complexities, overhead, and system-level reliability problems caused by serial flash, EEPROM, and other nonvolatile memories. Unlike serial flash and EEPROM, the CY15B256Q performs write operations at bus speed. No write delays are incurred. Data is written to the memory array immediately after each byte is successfully transferred to the device. The next bus cycle can commence without the need for data polling. In addition, the product offers substantial write endurance compared with other nonvolatile memories. The CY15B256Q is capable of supporting 1014 read/write cycles, or 100 million times more write cycles than EEPROM. These capabilities make the CY15B256Q ideal for nonvolatile memory applications requiring frequent or rapid writes. Examples range from data logging, where the number of write cycles may be critical, to demanding industrial controls where the long write time of serial flash or EEPROM can cause data loss. The CY15B256Q provides substantial benefits to users of serial EEPROM or flash as a hardware drop-in replacement. The CY15B256Q uses the high-speed SPI bus, which enhances the high-speed write capability of F-RAM technology. The device incorporates a read-only Device ID that allows the host to determine the manufacturer, product density, and product revision. The device specifications are guaranteed over an automotive-a range of -40 °C to +85 °C.

• 256-Kbit ferroelectric random access memory (F-RAM)logically organized as 32K × 8
  • High-endurance 100 trillion (1014) read/writes
  • 151-year data retention
  • No Delay™ writes
  • Advanced high-reliability ferroelectric process
• Very fast serial peripheral interface (SPI)
  • Up to 40-MHz frequency
  • Direct hardware replacement for serial flash and EEPROM
  • Supports SPI mode 0 (0, 0) and mode 3 (1, 1)
• Sophisticated write-protection scheme
  • Hardware protection using the Write Protect (WP) pin
  • Software protection using Write Disable instruction
  • Software block protection for 1/4, 1/2, or entire array
• Device ID
  • Manufacturer ID and Product ID
• Low power consumption
  • 2.5-mA active current at 40 MHz
  • 150-µA standby current
  • 8-µA sleep mode current
• Low-voltage operation: Vdd = 2.0 V to 3.6 V
• Automotive-