79LV2040RPFE-20 MAXWELL [Maxwell Technologies], 79LV2040RPFE-20 Datasheet - Page 12

• Manufacturer Part Number: 79LV2040RPFE-20
• Description: 20 Megabit (512K x 40-Bit) Low Voltage EEPROM MCM
• Manufacturer: MAXWELL [Maxwell Technologies]

Data Polling
Data Polling function allows the status of the EEPROM to be determined. If EEPROM is set to read mode during a
write cycle, an inversion of the last byte of data to be loaded outputs 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
goes low (V
RES Signal
When RES is LOW (V
keeping RES low when V
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.
20 Megabit (512K x 40-Bit) EEPROM MCM
During readout or standby, noise on the control pins may act as a trigger and turn the EEPROM to programming
mode by mistake. To prevent this phenomenon, the EEPROM has a noise cancellation function that cuts noise if its
width is 20ns or less in programming mode. Be careful not to allow noise of a width more than 20ns on the control
pins
.
OL)
after the first write signal. At the end of the write cycle, the RDY/Busy returns to a high state ( V
L
), the EEPROM cannot be read or programmed. The EEPROM data must be protected by
CC
is power on and off. RES should be high (V
09.07.05 Rev 1
H
All data sheets are subject to change without notice
) during read and programming operations.
79LV2040
©2005 Maxwell Technologies
All rights reserved
OH
).
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