SST32HF401

The SST32HF401 ComboMemory devices integrate a 128K x16 or 256K x16 CMOS flash memory bank with a 64K x16 or 128K x16 CMOS SRAM memory bank in a Multi-Chip Package (MCP), manufactured with SST's proprietary, high performance SuperFlash technology.
Featuring high performance Word-Program, the flash memory bank provides a maximum Word-Program time of 14 µsec. The entire flash memory bank can be erased and programmed word-by-word in typically 2 seconds for the SST32HF201/202 and 4 seconds for the SST32HF401/ 402, when using interface features such as Toggle Bit or Data# Polling to indicate the completion of Program operation. To protect against inadvertent flash write, the SST32HF20x/40x devices contain on-chip hardware and software data protection schemes.The SST32HF20x/40x devices offer a guaranteed endurance of 10,000 cycles. Data retention is rated at greater than 100 years.
The SST32HF20x/40x devices consist of two independent memory banks with respective bank enable signals. The Flash and SRAM memory banks are superimposed in the same memory address space. Both memory banks share common address lines, data lines, WE# and OE#. The memory bank selection is done by memory bank enable signals. The SRAM bank enable signal, BES# selects the SRAM bank. The flash memory bank enable signal, BEF# selects the flash memory bank. The WE# signal has to be used with Software Data Protection (SDP) command sequence when controlling the Erase and Program operations in the flash memory bank. The SDP command sequence protects the data stored in the flash memory bank from accidental alteration.
The SST32HF401 provide the added functionality of being able to simultaneously read from or write to the SRAM bank while erasing or programming in the flash memory bank. The SRAM memory bank can be read or written while the flash memory bank performs Sector- Erase, Bank-Erase, or Word-Program concurrently. All flash memory Erase and Program operations will automatically latch the input address and data signals and complete the operation in background without further input stimulus requirement. Once the internally controlled Erase or Program cycle in the flash bank has commenced, the SRAM bank can be accessed for Read or Write.
The SST32HF20x/40x devices are suited for applications that use both flash memory and SRAM memory to store code or data. For systems requiring low power and small form factor, the SST32HF20x/40x devices significantly improve performance and reliability, while lowering power.