79LV0408RPFE-20 MAXWELL [Maxwell Technologies], 79LV0408RPFE-20 Datasheet - Page 13

• Manufacturer Part Number: 79LV0408RPFE-20
• Description: Low Voltage 4 Megabit (512k x 8-bit) EEPROM
• Manufacturer: MAXWELL [Maxwell Technologies]

79LV0408
Low Voltage 4 Megabit (512k x 8-bit) EEPROM MCM
WE CE Pin Operation
During a write cycle, addresses are latched by the falling edge of WE or CE, and data is latched by the rising edge of
WE or CE.
Data Polling
Data Polling function allows the status of the EEPROM to be determined. If the EEPROM is set to read mode during a
write cycle, an inversion of the last byte of data to be loaded output is from I/O 7 to indicate that the EEPROM is per-
forming a write operation.
RDY/Busy Signal
RDY/Busy signal also allows a comparison operation to determine the status of the EEPROM. The RDY/Busy signal
has high impedance except in write cycle and is lowered to V
after the first write signal. At the-end of a write cycle,
OL
the RDY/Busy signal changes state to high impedance.
RES Signal
When RES is LOW, the EEPROM cannot be read and programmed. Therefore, data can be protected by keeping
RES low when V
is switched. RES should be kept high during read and programming because it doesn’t provide a
CC
latch function.
Data Protection
To protect the data during operation and power on/off, the EEPROM has the internal functions described below.
1. Data Protection against Noise of Control Pins (CE, OE, WE) during Operation.
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01.11.05 Rev 7
All data sheets are subject to change without notice
©2005 Maxwell Technologies
All rights reserved.