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MX26L3220XBI-12 Datasheet(PDF) 8 Page - Macronix International |
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MX26L3220XBI-12 Datasheet(HTML) 8 Page - Macronix International |
8 / 38 page 8 P/N:PM0826 REV. 0.5, JAN. 29, 2002 MX26L3220 RESET OPERATION The RESET pin provides a hardware method of resetting the device to reading array data. When the RESET pin is driven low for at least a period of tRP, the device immediately terminates any operation in progress, tristates all output pins, and ignores all read/write commands for the duration of the RESET pluse. The device also resets the internal state machine to reading array data. The operation that was interrupted should be reinitated once the device is ready to accept another command sequence, to ensure data integrity Current is reduced for the duration of the RESET pulse. When RESET is held at VSS±0.3V, the device draws CMOS standby current (ICC4). If RESET is held at VIL but not within VSS±0.3V, the standby current will be greater. The RESET pin may be tied to system reset circuitry. A system reset would that also reset the MTP EPROM. Refer to the AC Characteristics tables for RESET parameters and to Figure 14 for the timing diagram. SILICON ID READ OPERATION MTP EPROM are intended for use in applications where the local CPU alters memory contents. As such, manu- facturer and device codes must be accessible while the device resides in the target system. EPROM program- mers typically access signature codes by raising A9 to a high voltage. However, multiplexing high voltage onto address lines is not generally desired system design prac- tice. MX26L3220 provides hardware method to access the silicon ID read operation. Which method requires VID on A9 pin, VIL on CE, OE, A6, and A1 pins. Which apply VIL on A0 pin, the device will output MXIC's manufac- ture code of C2H. Which apply VIH on A0 pin, the device will output MX26L3220 device code of 22FDH. VI/O PIN OPERATION MX26L3220 is capable to provide the I/O prower supply (VI/O) pin to control Input/Output voltage levels of the device.The data outputs and voltage tolerated at its data input is determined by the voltage on the VI/O pin. This device is allows to operate in 1.8V or 3V system as re- quired. DATA PROTECTION The MX26L3220 is designed to offer protection against accidental erasure or programming caused by spurious system level signals that may exist during power transi- tion. During power up the device automatically resets the state machine in the Read mode. In addition, with its control register architecture, alteration of the memory contents only occurs after successful completion of spe- cific command sequences. The device also incorporates several features to prevent inadvertent write cycles re- sulting from VCC power-up and power-down transition or system noise. SECURED SILICON SECTOR The MX26L3220 features a Flash memory region where the system may access through a command sequence to create a permant part identification as so called Elec- tronic Serial Number (ESN) in the device. Once this re- gion is programmed, any further modification on the re- gion is impossible. The secured silicon sector is a 512 words in length, and uses a Secured Silicon Sector Indi- cator Bit (Q7) to indicate whether or not the Secured Silicon Sector is locked when shipped from the factory. This bit is permanently set at the factory and cannot be changed, which prevent duplication of a factory locked part.This ensures the security of the ESN once the prod- uct is shipped to the field. The MX26L3220 offers the device with Secured Silicon Sector either factory locked or custor lockable. The fac- tory-locked version is always protected when shipped from the factory , and has the Secured Silicon Sector Indicator Bit permanently set to a "1". The customer- lockable version is shipped with the Secured Silicon Sector unprotected, allowing customer to utilize that sec- tor in any form they prefer. The customer-lockable ver- VCC / VI/O Voltage Range Part No. VCC=2.7V to 3.6VVCC=2.7V to 3.6V VI/O=2.7V to 3.6VVI/O=1.65V to 2.6V MX26L3220-90 90ns 100ns MX26L3220-12 120ns 130ns Table 3 Notes: Typical values measured at VCC=2.7V to 3.6V, VI/O=2.7V to 3.6V |
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Similar Description - MX26L3220XBI-12 |
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