FEATURES
524,288 x 8 only
Single power supply operation
- 5.0V only operation for read, erase and program op-
eration
Fast access time: 55/70/90/120ns
Low power consumption
- 30mA maximum active current(5MHz)
- 1uA typical standby current
Command register architecture
- Byte Programming (7us typical)
- Sector Erase
8 equal sectors of 64K-Byte each
Auto Erase (chip & sector) and Auto Program
- Automatically erase any combination of sectors with
Erase Suspend capability.
- Automatically program and verify data at specified
address
Erase suspend/Erase Resume
- Suspends an erase operation to read data from, or
during erase and programming, while maintaining maxi-
mum EPROM compatibility.
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 MX29F040 uses a 5.0V
10% 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 protection is proved for stresses up to 100
milliamps on address and data pin from -1V to VCC
+ 1V.
GENERAL DESCRIPTION
The MX29F040 is a 4-mega bit Flash memory organized
as 512K bytes of 8 bits. MXIC's Flash memories offer
the most cost-effective and reliable read/write non-vola-
tile random access memory. The MX29F040 is pack-
aged in 32-pin PLCC, TSOP, PDIP. It is designed to be
reprogrammed and erased in system or in standard
EPROM programmers.
The standard MX29F040 offers access time as fast as
55ns, allowing operation of high-speed microprocessors
without wait states. To eliminate bus contention, the
MX29F040 has separate chip enable (CE) and output
enable (OE) controls.
MXIC's Flash memories augment EPROM functionality
with in-circuit electrical erasure and programming. The
MX29F040 uses a command register to manage this
functionality. The command register allows for 100%
TTL level control inputs and fixed power supply levels
program data to, another sector that is not being
erased, then resumes the erase.
Status Reply
- Data polling & Toggle bit for detection of program
and erase cycle completion.
Sector protect/unprotect for 5V only system or 5V/
12V system.
Sector protection
- Hardware method to disable any combination of
sectors from program or erase operations
100,000 minimum erase/program cycles
Latch-up protected to 100mA from -1V to VCC+1V
Low VCC write inhibit is equal to or less than 3.2V
Package type:
- 32-pin PLCC, TSOP or PDIP
Compatibility with JEDEC standard
- Pinout and software compatible with single-power
supply Flash
20 years data retention
1
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REV. 2.3, DEC. 10, 2004
MX29F040
4M-BIT [512KX8] CMOS EQUAL SECTOR FLASH MEMORY
4
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REV. 2.3, DEC. 10, 2004
MX29F040
AUTOMATIC PROGRAMMING
The MX29F040 is byte programmable using the Auto-
matic 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 MX29F040 is less than 4 seconds.
AUTOMATIC CHIP ERASE
The entire chip is bulk erased using 10 ms erase pulses
according to MXIC's Automatic Chip Erase algorithm.
Typical erasure at room temperature is accomplished in
less than 4 second. The Automatic Erase algorithm au-
tomatically 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 MX29F040 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 programs the specified sector(s) prior to
electrical erase. The timing and verification of
electrical erase are controlled internally within the
device.
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 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 pre-program 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 of WE or CE,
whichever happens later, and data are latched on the
rising edge of WE or CE, whichever happens first.
MXIC's Flash technology combines years of EPROM
experience to produce the highest levels of quality, relia-
bility, and cost effectiveness. The MX29F040 electrically
erases all bits simultaneously using Fowler-Nordheim
tunneling. The bytes are programmed by using the
EPROM programming mechanism of hot electron injec-
tion.
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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REV. 2.3, DEC. 10, 2004
MX29F040
First Bus
Second Bus
Third Bus
Fourth Bus
Fifth Bus
Sixth Bus
Command
Bus
Cycle
Cycle
Cycle
Cycle
Cycle
Cycle
Cycle
Addr
Data
Addr
Data
Addr
Data
Addr
Data
Addr
Data
Addr
Data
Reset
1
XXXH
F0H
Read
1
RA
RD
Read Silicon ID
4
555H
AAH
2AAH 55H
555H
90H
ADI
DDI
Sector Protect Verify
4
555H
AAH
2AAH 55H
555H
90H
(SA)X 00H
02
01H
Program
4
555H
AAH
2AAH 55H
555H
A0H
PA
PD
Chip Erase
6
555H
AAH
2AAH 55H
555H
80H
555H
AAH
2AAH 55H
555H 10H
Sector Erase
6
555H
AAH
2AAH 55H
555H
80H
555H
AAH
2AAH 55H
SA
30H
Sector Erase Suspend
1
XXXH
B0H
Sector Erase Resume
1
XXXH
30H
Unlock for sector
6
555H
AAH
2AAH 55H
555H
80H
555H
AAH
2AAH 55H
555H 20H
protect/unprotect
TABLE 1. SOFTWARE COMMAND DEFINITIONS
Note:
1. ADI = Address of Device identifier; A1=0, A0 = 0 for manufacture code,A1=0, A0 = 1 for device code A2-A18=Do
not care.
(Refer to table 3)
DDI = Data of Device identifier : C2H for manufacture code, A4H for device code.
X = X can be VIL or VIH
RA=Address of memory location to be read.
RD=Data to be read at location RA.
2. PA = Address of memory location to be programmed.
PD = Data to be programmed at location PA.
SA = Address to the sector to be erased.
3. The system should generate the following address patterns: 555H or 2AAH to Address A10~A0 .
Address bit A11~A18=X=Don't care for all address commands except for Program Address (PA) and Sector
Address (SA). Write Sequence may be initiated with A11~A18 in either state.
4. For Sector Protect Verify Operation : If read out data is 01H, it means the sector has been protected. If read out
data is 00H, it means the sector is still not being protected.
COMMAND DEFINITIONS
Device operations are selected by writing specific ad-
dress and data sequences into the command register.
Writing incorrect address and data values or writing them
in the improper sequence will reset the device to the
read mode. Table 1 defines the valid register command
sequences. Note that the Erase Suspend (B0H) and
Erase Resume (30H) commands are valid only while the
Sector Erase operation is in progress. Either of the two
reset command sequences will reset the device (when
applicable).
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