TMS28F400BZT, TMS28F400BZB 524288 BY 8-BIT/262144 BY 16-BIT BOOT-BLOCK FLASH MEMORIES

SMJS400E - JUNE 1994 - REVISED JANUARY 1998

features

• Organization... 524288 by 8 Bits 262144 by 16 Bits
• Array-Blocking Architecture
  • Two 8K-Byte Parameter Blocks
  • One 96K-Byte Main Block
  • Three 128K-Byte Main Blocks
  • One 16K-Byte Protected Boot Block
  • Top or Bottom Boot Locations
• All Inputs/Outputs TTL Compatible
• Maximum Access/Minimum Cycle Time
• 10000 Program/Erase-Cycles
• Two Temperature Ranges
  • Commercial...0°C to 70°C
  • Extended...- 40°C to 85°C
• Low Power Dissipation (V_CC = 5.5 V)
  • Active Write...330 mW (Byte Write)
  • Active Read...330 mW (Byte Read)
  • Active Write...358 mW (Word Write)
  • Active Read...330 mW (Word Read)
  • Block Erase...165 mW
  • Standby...0.55 mW (CMOS-Input Levels)
  • Deep Power-Down Mode...0.0066 mW
• Fully Automated On-Chip Erase and Word/Byte-Program Operations
• Write Protection for Boot Block
• Industry Standard Command State Machine (CSM)
  • Erase Suspend/Resume
  • Algorithm-Selection Identifier

description

The TMS28F400BZx is a 524288 by 8-bit/262144 by 16-bit (4194304-bit), boot-block flash memory that can be electrically block-erased and reprogrammed. The TMS28F400BZx is organized in a blocked architecture consisting of one 16K-byte protected boot block, two 8K-byte parameter blocks, one 96K-byte main block, and three 128K-byte main blocks. The device can be ordered with either a top or bottom boot-block configuration. Operation as a 512K-byte (8-bit) or a 256K-word (16-bit) organization is user-definable.

Embedded program and block-erase functions are fully automated by an on-chip write state machine (WSM), simplifying these operations and relieving the system microcontroller of these secondary tasks. WSM status can be monitored by the on-chip status register to determine progress of program/erase tasks. The device features user-selectable block erasure.

The TMS28F400BZx flash memory is offered in a 44-pin PSOP. It is available in two temperature ranges:0°C to 70°C and - 40°C to 85°C.

View more information about generic part numbers:TMS28F400BZB, TMS28F400BZT

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