PUMA2E4001-12E Mosaic Semiconductor, PUMA2E4001-12E Datasheet - Page 9

• Manufacturer Part Number: PUMA2E4001-12E
• Description: 128K x 32 EEPROM Module
• Manufacturer: Mosaic Semiconductor

ISSUE 4.2 : November 1998
The device can be automatically protected during power-up and power-down without the need for external circuits
by employing the software data protect feature. The internal software data protection circuit is enabled after the
first write operation utilizing the software algorithm. This circuit is nonvolatile and will remain set for the life of the
device unless the reset command is issued.
Once the software protection is enabled, the device is also protected against inadvertent and accidental writes in
that, the software algorithm must be issued prior to writing additional data to the device.
0 = V
The table below shows the logic inputs required to control the operation of the device.
Software Data Protection
Operating Modes
MODE
Read
Write
Standby
Write Inhibit
IL
: 1 = V
IH
CS1~4 OE
: X = V
0
0
1
X
X
0
X
X
0
IH
I
or V
WE
1
0
X
1
X
IL
OUTPUTS
Data Out
Data in
Floating
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PUMA 2/67/77E4001/A - 12/15/20