Features: Single power supply operation
-5.0 volt-only operation for read, erase, and
program operations
-Minimizes system level requirements
Manufactured on 0.35 µm process technology
-Compatible with 0.5 µm Am29F400 device
High performance
-Access times as fast as 55 ns
Low power consumption (typical values at 5 MHz)
-1 µA standby mode current
-20 mA read current (byte mode)
-28 mA read current (word mode)
-30 mA program/erase current
Flexible sector architecture
-One 16 Kbyte, two 8 Kbyte, one 32 Kbyte, and
seven 64 Kbyte sectors (byte mode)
-One 8 Kword, two 4 Kword, one 16 Kword, and
seven 32 Kword sectors (word mode)
-Supports full chip erase
-Sector Protection features:
A hardware method of locking a sector to prevent any program
or erase operations within that sector Sectors can be locked
via programming equipment Temporary Sector Unprotect
feature allows code changes in previously locked sectors
Top or bottom boot block configurations available
Embedded Algorithms
-Embedded Erase algorithm automatically
preprograms and erases the entire chip or any
combination of designated sectors
-Embedded Program algorithm automatically
writes and verifies data at specified addresses
Minimum 1,000,000 program/erase cycles per sector guaranteed
Package option
-48-pin TSOP
-44-pin SO
Compatibility with JEDEC standards
-Pinout and software compatible with single-
power-supply Flash
-Superior inadvertent write protection
Data# Polling and toggle bits
-Provides a software method of detecting
program or erase operation completion
Ready/Busy# pin (RY/BY#)
-Provides a hardware method of detecting
program or erase cycle completion
Erase Suspend/Erase Resume
-Suspends an erase operation to read data from,
or program data to, a sector that is not being
erased, then resumes the erase operation
Hardware reset pin (RESET#)
-Hardware method to reset the device to reading
array dataSpecificationsStorage TemperaturePlastic Packages . . . . . . . . . . . . . . ... 65°C to +150°C
Ambient Temperaturewith Power Applied. . . . . . . . . . . . . . 55°C to +125°C
Voltage with Respect to Ground
VCC(Note 1) . . . . . . . . . . . . . . . . .. . . . . . . . .. . . . . . ............. .2.0 V to +7.0
VA9, OE#, and
RESET# (Note 2). . . . . . . . . . . . .. . . . . . . . . .. . . . . . .........2.0 V to +12.5 V
All other pins (Note 1) . . . . . .. . . . . . . . . . .. . . . . . . . ........ .0.5 V to +7.0 V
Output Short Circuit Current (Note 3) . . . . . . . . . . . . . . . .. ....... . .. . . . 200 mADescriptionThe Am29F400B is a 4 Mbit, 5.0 volt-only Flash memory organized as 524,288 bytes or 262,144 words.The device is offered in 44-pin SO and 48-pin TSOP packages. The word-wide data (x16) appears onDQ0. This device is designed to be programmed insystem with the standard system 5.0voltVCCsupply.A12.0 is not required for write or erase operations. The device can also be programmed in standard EPROM programmers.
Am29F400B is manufactured using AMD's 0.35 µmprocess technology, and offers all the features and benefits of the Am29F400, whichwasmanufacturedusing 0.5 µm process technology.The standard device offers access times of 55, 60, 70,90, 120, and 150 ns, allowing high speed microprocessors toperatewithout wait states. To eliminate buscontention the device has separate chip enable write enable and output enable controls.
Am29F400Brequires only a single 5.0 volt power supplyfor both read and write functions. Internally gener-ated and regulated voltages are provided for the program and erase operations.
Hardware data protectionmeasures include a lowdetector that automatically inhibits write operahardware sector/protectionfeature disables both program and eraseoperations in any combination of the sectors of memory. This can be achieved via programming equipment.Erase Suspend feature enables the user to puterase on hold for any period of time to read data from,or program data to, any sector that is not selected forerasure. True background erase can thus be achieved.hardware RESET pin terminates any operationn progress and resets the internal state machine toreading array data. The RESETpin may be tied to thesystem reset circuitry. A system reset would thus alsoreset Am29F400B, enabling the system microprocessorstandby mode.Power consumption is greatly reduced in this mode.
Am29F400B Data Sheet
