TMS28F400AST

262 144 x 16 位和 524 288 x 8 位自动选择引导块闪存

The TMS28F400Axy is a 524288 by 8 bits/262144 by 16 bits 4194304-bit, boot-block flash memory that can be electrically block-erased and reprogrammed. The TMS28F400Axy is organized in a blocked architecture consisting of:

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One 16K-byte protected boot block

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Two 8K-byte parameter blocks

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One 96K-byte main block

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Three 128K-byte main blocks

Table 1 lists the five different voltage configurations available for ordering. Operation as a 512K-byte 8-bit or a 256K-word 16-bit organization is user-definable.

Only the 44-pin PSOP is offered in the -40°C to 125°C temperature range.

NOTE 1: All configurations are available in the TMS28F004Axy 8 bit configuration only and top or bottom boot.

The TMS28F004Axy is offered in a 512K-byte organization only. The operation for this device is the same as the TMS28F400Axy and is offered in the same voltage configurations. TMS28F004Axy can be substituted for the byte-wide TMS28F400Axy with the latter being the generic name for this device family.

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

The configurations are as follows:

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The TMS28F400ASy configuration has the auto-select feature that allows the user alternative read and program/erase voltages. Memory reads can be performed using 3.3-V VCC for optimum power consumption or 5-V VCC for device performance. Erasing or programming the device can be accomplished with 5-V VPP, which eliminates having to use a 12-V source and/or in-system voltage converters. Alternatively,12-V VPP operation exists for systems that already have a 12-V power supply, which provides faster programming and erasing times. This configuration is offered in two temperature ranges: 0°C to 70°C and -40°C to 85°C.

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The TMS28F400AEy configuration offers the auto-select feature of the TMS28F400ASy with an extended VCC range of 2.7-V to 3.6-V 3-V nominal. Memory reads can be performed using 3-V VCC, for more efficient power consumption than the "ASy device.

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The TMS28F400AMy configuration offers a 3-V or 5-V memory read with a 12-V program and erase. This configuration is intended for low 3.3-V reads and the fast programming offered with the 12-V VPP and 5-V VCC. This configuration is offered in two temperature ranges: 0°C to 70°C and - 40°C to 85°C.

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The TMS28F400AFy configuration offers a 5-V memory read with a 5-V or 12-V program and erase. This configuration is intended for systems using a single 5-V power supply. This configuration is offered in three temperature ranges: 0°C to 70°C, - 40°C to 85°C, and - 40°C to 125°C.

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The TMS28F400AZy configuration offers a 5-V memory read with a 12-V program and erase for fast programming and erasing times. This configuration is offered in three temperature ranges: 0°C to 70°C,

\- 40°C to 85°C, and - 40°C to 125°C.

The y in the device name represents a T for top or B for bottom boot-block configuration.

All configurations of the TMS28F400Axy are offered in a 44-pin plastic small-outline package PSOP and a 48-pin thin small-outline package TSOP. The TMS28F004Axy is offered in a 40-pin TSOP only. Both the 40-pin and 48-pin TSOP are offered for the 0°C to 70°C and - 40°C to 85°C temperature ranges only.

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Organization... 524288 By 8 Bits

262144 By 16 Bits

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Array-Blocking Architecture

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One 16K-Byte Protected Boot Block

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Two 8K-Byte Parameter Blocks

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One 96K-Byte Main Block

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Three 128K-Byte Main Blocks

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Top or Bottom Boot Locations

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"28F400Axy Offers a User-Defined 8-Bit Byte or 16-Bit Word Organization

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"28F004Axy Offers Only the 8-Bit Organization

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Maximum Access/Minimum Cycle Time

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Commercial and Extended

3.3-V VCC ± 0.3 V

"28F400Axy60 60 ns 110 ns

"28F400Axy70 70 ns 130ns

"28F400Axy80 80 ns 150 ns

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Automotive offered for only 5-V VCC voltage configurations

"28F400Axy70 70 ns

"28F400Axy80 80 ns

"28F400Axy90 90 ns

x = S, E, F, M, or Z Depending on VCC/VPP Configuration

y = T or B for Top or Bottom Boot-Block Configuration

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100000 and 10000 Program/Erase Cycle Versions

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Three Temperature Ranges

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Commercial...0°C to 70°C

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Extended...- 40°C to 85°C

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Automotive...- 40°C to 125°C

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Industry Standard Packages Offered in

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40-Pin TSOP DCD Suffix

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44-Pin PSOP DBJ Suffix

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48-Pin TSOP DCD Suffix

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Low Power Dissipation VCC = 5.5 V

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Active Write...248 mW Byte Write

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Active Read...330 mW Byte Read

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Active Write...248 mW Word Write

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Active Read...330 mW Word Read

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Block Erase...165 mW

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Standby...0.72 mW CMOS-Input Levels

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Fully Automated On-Chip Erase and Word/Byte Program Operations

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Write Protection for Boot Block

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Industry Standard Command-State Machine CSM

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Erase Suspend/Resume

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Algorithm-Selection Identifier

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Three Different Combinations of Supply Voltages Offered

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All Inputs/Outputs TTL Compatible