MX29F022 Macronix, MX29F022 Datasheet - Page 13

• Manufacturer Part Number: MX29F022
• Description: 2M-BIT[256K x 8]CMOS FLASH MEMORY
• Manufacturer: Macronix

It is also possible to determine if the chip is unprotected
in the system by writing the Read Silicon ID command.
Performing a read operation with A1=VIH, it will produce
00H at data outputs(Q0-Q7) for an unprotected chip. It
is noted that all sectors are unprotected after the chip
unprotect algorithm is complete.
CHIP PROTECTION WITHOUT 12V SYSTEM
The MX29F022T/B also feature a hardware chip
protection method in a system without 12V power
suppply. The programming equipment do not need to
supply 12 volts to protect all sectors. The details are
shown in chip protect algorithm and waveform.
CHIP UNPROTECT WITHOUT 12V SYSTEM
The MX29F022T/B also feature a hardware chip
unprotection method in a system without 12V power
supply. The programming equipment do not need to
supply 12 volts to unprotect all sectors. The details are
shown in chip unprotect algorithm and waveform.
POWER-UP SEQUENCE
The MX29F022T/B powers up in the Read only mode.
In addition, the memory contents may only be altered
after successful completion of a two-step command
sequence. Vpp and Vcc power up sequence is not
required.
P/N:PM0556
13
ABSOLUTE MAXIMUM RATINGS
NOTICE:
Stresses greater than those listed under ABSOLUTE MAXI-
MUM RATINGS may cause permanent damage to the de-
vice. This is a stress rating only and functional operational
sections of this specification is not implied. Exposure to ab-
solute maximum rating conditions for extended period may
affect reliability.
NOTICE:
Specifications contained within the following tables are sub-
ject to change.
RATING
Ambient Operating Temperature
Storage Temperature
Applied Input Voltage
Applied Output Voltage
VCC to Ground Potential
A9
MX29F022/022N
REV. 1.1, JUN. 14, 2001
VALUE
0
-65
-0.5V to 7.0V
-0.5V to 7.0V
-0.5V to 7.0V
-0.5V to 13.5V
o
C to 70
o
C to 125
o
C
o
C