■ DESCRIPTION
The MBM29F400TC/BC is a 4M-bit, 5.0 V-only Flash memory organized as 512K bytes of 8 bits each or 256K words of 16 bits each. The MBM29F400TC/BC is offered in a 48-pin TSOP and 44-pin SOP packages. This device is designed to be programmed in-system with the standard system 5.0 V VCC supply. 12.0 V VPP is not required for write or erase operations. The devices can also be reprogrammed in standard EPROM programmers. The standard MBM29F400TC/BC offers access times 55 ns and 90 ns allowing operation of high-speed microproces sors without wait states. To eliminate bus contention the device has separate chip enable (CE), write enable (WE), and output enable (OE) controls.
The MBM29F400TC/BC is pin and command set compatible with JEDEC standard. Commands are written to the command register using standard microprocessor write timings. Register contents serve as input to an internal state-machine which controls the erase and programming circuitry. Write cycles also internally latch addresses and data needed for the programming and erase operations. Reading data out of the devices is similar to reading from12.0 V Flash or EPROM devices.

■ FEATURES
• Single 5.0 V read, write, and erase
   Minimizes system level power requirements
• Compatible with JEDEC-standard commands
   Uses same software commands as E2PROMs
• Compatible with JEDEC-standard world-wide pinouts
   48-pin TSOP (Package suffix: PFTN – Normal Bend Type, PFTR – Reversed Bend Type)
   44-pin SOP (Package suffix: PF)
• Minimum 100,000 write/erase cycles
• High performance
   55 ns maximum access time
• Sector erase architecture
   One 16K byte, two 8K bytes, one 32K byte, and seven 64K bytes.
   Any combination of sectors can be concurrently erased. Also supports full chip erase.
• Boot Code Sector Architecture
   T = Top sector
   B = Bottom sector
• Embedded EraseTM* Algorithms
   Automatically pre-programs and erases the chip or any sector
• Embedded ProgramTM* Algorithms
   Automatically writes and verifies data at specified address
• Data Polling and Toggle Bit feature for detection of program or erase cycle completion
• Ready/Busy output (RY/BY)
   Hardware method for detection of program or erase cycle completion
• Low Vcc write inhibit ≤ 3.2 V
• Erase Suspend/Resume
   Suspends the erase operation to allow a read in another sector within the same device
• Hardware RESET pin Resets internal state machine to the read mode
• Sector protection
   Hardware method disables any combination of sectors from write or erase operations
• Temporary sector unprotection Temporary sector unprotection via the RESET pin.
*: Embedded EraseTM and Embedded ProgramTM are trademarks of Advanced Micro Devices, Inc.