PYA28C256-12LMB datasheet(3/14 Pages) PYRAMID

Part #	PYA28C256-12LMB

Description	Access Times of 150, 200, 250 and 350ns Software Data Protection

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Manufacturer	PYRAMID [Pyramid Semiconductor Corporation]

Direct Link	http://www.pyramidsemiconductor.com

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PYA28C256 - 32K x 8 EEPROM

Page 3

Document # EEPROM104 REV 03

3-byte command sequence used to enable SDP.

Once set, SDP will remain active unless the disable com-

mand sequence is issued. Power transitions do not dis-

able SDP and SDP will protect the PYA28C256 during

power-up and power-down conditions. All command se-

quences must conform to the page write timing specifi-

cations. The data in the enable and disable command

sequences is not written to the device and the memory

addresses used in the sequence may be written with data

in either a byte or page write operation.

After setting SDP, any attempt to write to the device with-

out the 3-byte command sequence will start the internal

write timers. No data will be written to the device; howev-

er, for the duration of tWC, read operations will effectively

be polling operations.

DEVICE IDEnTIFICATIOn

An extra 64 bytes of EEPROM memory are available to

the user for device identification. By raising A9 to 12V

± 0.5V and using address locations 7FC0H to 7FFFH

the additional bytes may be written to or read from in the

same manner as the regular memory array.

OPTIOnAL CHIP ERASE MODE

The entire device can be erased using a 6-byte software

code. Please see "Software Chip Erase" application note

at the end of this datasheet for details.

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