MX29LV640BUXBC-12 datasheet(2/64 Pages) MCNIX

Part #	MX29LV640BUXBC-12

Description	64M-BIT [4M x 16] CMOS EQUAL SECTOR FLASH MEMORY

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Manufacturer	MCNIX [Macronix International]

Direct Link	http://www.macronix.com

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P/N:PM1081

REV. 1.0, MAR. 08, 2005

MX29LV640BU

with in-circuit electrical erasure and programming. The

MX29LV640BU uses a command register to manage this

functionality.

MXIC Flash technology reliably stores memory contents

even after 100,000 erase and program cycles. The MXIC

cell is designed to optimize the erase and program

mechanisms. In addition, the combination of advanced

tunnel oxide processing and low internal electric fields

for erase and programming operations produces reliable

cycling. The MX29LV640BU uses a 2.7V to 3.6V VCC

supply to perform the High Reliability Erase and auto

Program/Erase algorithms.

The highest degree of latch-up protection is achieved

with MXIC's proprietary non-epi process. Latch-up pro-

tection is proved for stresses up to 100 milliamps on

address and data pin from -1V to VCC + 1V.

AUTOMATIC PROGRAMMING

The MX29LV640BU is word programmable using the Au-

tomatic Programming algorithm. The Automatic Program-

ming algorithm makes the external system do not need

to have time out sequence nor to verify the data pro-

grammed. The typical chip programming time at room

temperature of the MX29LV640BU is less than 48 sec-

onds.

AUTOMATIC PROGRAMMING ALGORITHM

MXIC's Automatic Programming algorithm require the user

to only write program set-up commands (including 2 un-

lock write cycle and A0H) and a program command (pro-

gram data and address). The device automatically times

the programming pulse width, provides the program veri-

fication, and counts the number of sequences. A status

bit similar to DATA# polling and a status bit toggling be-

tween consecutive read cycles, provide feedback to the

user as to the status of the programming operation.

AUTOMATIC CHIP ERASE

The entire chip is bulk erased using 50 ms erase pulses

according to MXIC's Automatic Chip Erase algorithm.

Typical erasure at room temperature is accomplished in

less than 45 seconds. The Automatic Erase algorithm

automatically programs the entire array prior to electrical

erase. The timing and verification of electrical erase are

controlled internally within the device.

AUTOMATIC SECTOR ERASE

The MX29LV640BU is sector(s) erasable using MXIC's

Auto Sector Erase algorithm. Sector erase modes allow

sectors of the array to be erased in one erase cycle. The

Automatic Sector Erase algorithm automatically pro-

grams the specified sector(s) prior to electrical erase.

The timing and verification of electrical erase are con-

trolled internally within the device.

AUTOMATIC ERASE ALGORITHM

MXIC's Automatic Erase algorithm requires the user to

write commands to the command register using stand-

ard microprocessor write timings. The device will auto-

matically preprogram and verify the entire array. Then

the device automatically times the erase pulse width,

provides the erase verification, and counts the number

of sequences. A status bit toggling between consecu-

tive read cycles provides feedback to the user as to the

status of the programming operation.

Register contents serve as inputs to an internal state-

machine which controls the erase and programming cir-

cuitry. During write cycles, the command register inter-

nally latches address and data needed for the program-

ming and erase operations. During a system write cycle,

addresses are latched on the falling edge, and data are

latched on the rising edge of WE# .

MXIC's Flash technology combines years of EPROM

experience to produce the highest levels of quality, relia-

bility, and cost effectiveness. The MX29LV640BU elec-

trically erases all bits simultaneously using Fowler-Nord-

heim tunneling. The words are programmed by using

the EPROM programming mechanism of hot electron in-

jection.

During a program cycle, the state-machine will control

the program sequences and command register will not

respond to any command set. During a Sector Erase

cycle, the command register will only respond to Erase

Suspend command. After Erase Suspend is completed,

the device stays in read mode. After the state machine

has completed its task, it will allow the command regis-

ter to respond to its full command set.

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MX29LV640BUXBC-12 Datasheet(PDF) 2 Page - Macronix International

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