W25B40

• W25B40 / W25B40A 4M-bit Serial Flash
4M-bit /512K-byte (524,288)
256-bytes per programmable page
• Compatible with W25P40 with special features
Small Boot and Parameter Sectors
Write protection of Boot/Parameter area
• Variable Sector Sizes for Boot Code and Parameter Storage
Seven sectors of 64KB
One sector each of 32KB, 16Kb and 8KB
Two sectors of 4KB
Bottom Boot organization (standard)
Top Boot organization (special order)
• 4-pin SPI Serial Interface
Clock, Chip Select, Data In, Data Out
Easily interfaces to popular microcontrollers
Compatible with SPI Modes 0 and 3
Optional Hold function for SPI flexibility
• Low Power Consumption, Wide Temperature Range
Single 2.7 to 3.6V supply
5mA active current, <1A Power-down
-40° to +85°C operating range
• Fast and Flexible Serial Data Access
Clock operation to 40MHz
Byte-addressable Read and Program
Auto-increment Read capability
Manufacturer and Device ID
• Programming Features
Page program up to 256 bytes 2mS
Sector Erase 120mS to 650mS
Chip erase 5.5 seconds
100,000 erase/write cycles
Twenty-year data retention
• Software and Hardware Write Protection
Write-Protect all or portion of memory
Enable/Disable protection with /WP pin
• SOIC Compatible Packaging
Tiny 8-pin SOIC 150mil
• Ideal for systems with limited pins, space, and power
Controller-based serial code-download
C systems storing data, text or voice
Battery-operated and portable product

Notes:
1 This device has been designed and tested for the specified operation ranges. Proper operation outside of these levels is not guaranteed. Exposure beyond absolute maximum ratings (listed above) may cause permanent damage.
2. Compliant with JEDEC Standard J-STD-20C for small body Sn-Pb or Pb-free (Green) assembly and the European directive on restrictions on hazardous substances (RoHS) 2002/95/EU..
3. JEDEC Std JESD22-A114A (C1=100 pF, R1=1500 ohms, R2=500 ohms).

The W25B40 / W25B40A is a 4Mb (512KB) Serial Flash Memory with erasable sectors that allows for boot code and parameter storage. The W25B40 / W25B40A is packaged in an 8-pin SOIC 150-mil and is compatible with the standard W25P40 specification with the following exceptions.

• The W25B40 / W25B40A has twelve sectors instead of eight including: seven sectors of 64KB,one sector of 32KB, one sector of 16KB, one sector of 8KB and two sectors of 4KB. (see figure 2a and 2b)

• The W25B40 / W25B40A status register write protect bits (BP2, BP1, and BP0) can protect the boot and parameter sectors. Unlike other Serial Flash devices, that only protect large portions of the memory and typically from the top address down, the W25B40 / W25B40A can protect boot code stored in the small sectors for either bottom or top boot configurations. This feature makes the process of field updates more robust and reliable. (See Write Protection Operation table)

• The W25B40 / W25B40A Bottom Boot Device ID is 32h instead of 12h as with the 25P40. Optional Top Boot is 42h.

The Winbond W25B40 / W25B40A is fully compatible with the previous NexFlash NX25B40 Serial Flash memory.