LE28CV1001M-12 데이터 시트보기 (PDF) - SANYO -> Panasonic
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LE28CV1001M-12 Datasheet PDF : 14 Pages
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LE28CV1001M, T-12/15
Toggle Bit (DQ6)
Data values of 0 and 1 are output alternately for DQ6, that is DQ6 is toggled between 0 and 1, during the internal
programming cycle. When the internal programming cycle completes this toggling is stopped and the device becomes
ready to execute the next operation. Figure 5 shows the toggle bit timing diagram and Figure 10 shows the flowchart for
this operation.
Data Protection
Hardware Data Protection
Noise and glitch protection: The LE28CV1001 does not execute write operations for WE or OE pulses that are 15 ns or
shorter.
Power (VDD) on and cutoff detection: The programming operation is disabled when VDD is 2.5 V or lower.
Write inhibit mode: Writing is disabled when OE is low and either CE is high or WE is high. Use this function to prevent
writes from occurring when the power is being turned on or off.
Software Data Protection
The LE28CV1001 implements the optional software data protection function recognized by JEDEC. This function
requires that a 3-byte load operation to be performed before a write operation data load. The 3-byte load sequence starts
a page load cycle without activating any write operation. Thus this is an optimal protection scheme for unintended write
cycles triggered by noise associated with powering the chip on or off. Note that the LE28CV1001 is shipped with the
software data protection function disabled.
The software data protection circuit is activated by executing a 3-byte byte load cycle in advance of the data sequence in
the page load cycle. (See Figure 6.) This causes the device to automatically enter data protection mode. After this, write
operations require a 3-byte byte load cycle to be executed in advance. A 6-byte write sequence is required to switch the
device out of this protection mode. Figure 7 shows the timing diagram. If a write operation is attempted in software
protection mode, all device functions are disabled for 200 µs. Figure 11 shows the flowchart for this operation.
Product Identification
The device identification code is used for recognizing the device and its manufacturer. This mode can be used by
hardware and software. The hardware operating mode is used to recognize algorithms that match the device when an
external programming unit is used. Also, user systems can recognize the product number using software product
identification mode. Figure 12 shows the flowchart for this operation. The manufacturer and device codes are the same
in both modes.
No. 5409-5/14
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