Product Description
SST25WF040B is a member of the Serial Flash 25
Series family and feature a four-wire, SPI-compatible
interface that allows for a low pin-count package which
occupies less board space and ultimately lowers total
system costs. SPI serial flash memory is manufactured
with proprietary, high-performance CMOS SuperFlash
technology. The split-gate cell design and thick-oxide
tunneling injector attain better reliability and manufacturability
compared with alternate approaches.
This Serial Flash significantly improve performance
and reliability, while lowering power consumption. The
device writes (Program or Erase) with a single power
supply of 1.65-1.95V. The total energy consumed is a
function of the applied voltage, current, and time of
application. Since for any given voltage range, the
SuperFlash technology uses less current to program
and has a shorter erase time, the total energy consumed
during any Erase or Program operation is less
than alternative flash memory technologies.

Features
• Single Voltage Read and Write Operations
- 1.65-1.95V
• Serial Interface Architecture
- SPI Compatible: Mode 0 and Mode 3
• High Speed Clock Frequency
- 40MHz
• Dual Input/Output Support
- Fast-Read Dual-Output Instruction (3BH)
- Fast-Read Dual I/O Instruction (BBH)
• Superior Reliability
- Endurance: 100,000 Cycles
- Greater than 20 years Data Retention
• Ultra-Low Power Consumption:
- Active Read Current: 4 mA (typical)
- Standby Current: 7 μA (typical)
- Power-down Mode Standby Current: 2 μA (typical)
• Flexible Erase Capability
- Uniform 4 KByte sectors
- Uniform 64 KByte overlay blocks
• Page Program Mode
- 256 Bytes/Page
• Fast Erase and Page-Program:
- Chip-Erase Time: 400 ms (typical)
- Sector-Erase Time: 40 ms (typical)
- Block-Erase Time: 80 ms (typical)
- Page-Program Time: 0.8 ms/ 256 bytes (typical)
• End-of-Write Detection
- Software polling the BUSY bit in Status Register
• Hold Pin (HOLD#)
- Suspend a serial sequence without deselecting the
device
• Write Protection (WP#)
- Enables/Disables the Lock-Down function of the
status register
• Software Write Protection
- Write protection through Block-Protection bits in
status register
• Temperature Range
- Industrial: -40°C to +85°C
- Extended: -40°C to +125°C
• Packages Available
- 8-lead SOIC (150 mils)
- 8-contact USON (2mm x 3mm)
• All devices are RoHS compliant