Temperature Under Bias................. -55°C to +125°C

Storage Temperature...................... -65°C to +150°C

All Input Voltages

(including NC Pins)

with Respect to Ground ................... -0.6V to +6.25V

All Output Voltages

Voltage on A9

(including NC Pins)

with Respect to Ground ................... -0.6V to +13.5V

*NOTICE: Stresses beyond those listed under “Absolute Maxi-

mum Ratings” may cause permanent damage to the device.

This is a stress rating only and functional operation of the

device at these or any other conditions beyond those indi-

cated in the operational sections of this specification is not

implied. Exposure to absolute maximum rating conditions

for extended periods may affect device reliability.

Absolute Maximum Ratings*

period will start. A7 to A15 specify the sector address. The

sector address must be valid during each high to low tran-

sition of WE (or CE). A0 to A6 specify the byte address

within the sector. The bytes may be loaded in any order;

sequential loading is not required. Once a programming

read operation will effectively be a polling operation.

HARDWARE DATA PROTECTION:

Hardware features

protect against inadvertent programs to the AT29LV512 in

the device will automatically time out 10 ms (typical) be-

fore programming. (c) Program inhibit— holding any one

of OE low, CE high or WE high inhibits program cycles. (d)

Noise filter— pulses of less than 15 ns (typical) on the WE

or CE inputs will not initiate a program cycle.

INPUT LEVELS: While operating with a 3.3V

±10%

power supply, the address inputs and control inputs (OE,

CE and WE) may be driven from 0 to 5.5V without ad-

versely affecting the operation of the device. The I/O lines

can only be driven from 0 to 3.6 volts.

PRODUCT IDENTIFICATION:

The product identifica-

tion mode identifies the device and manufacturer as At-

mel. It may be accessed by hardware or software opera-

tion. The hardware operation mode can be used by an ex-

ternal programmer to identify the correct programming al-

gorithm for the Atmel product. In addition, users may wish

to use the software product identification mode to identify

the part (i.e. using the device code), and have the system

software use the appropriate sector size for program op-

erations. In this manner, the user can have a common

board design for 256K to 4-megabit densities and, with

each density’s sector size in a memory map, have the sys-

tem software apply the appropriate sector size.

For details, see Operating Modes (for hardware operation)

or Software Product Identification. The manufacturer and

device code is the same for both modes.

DATA POLLING:

The AT29LV512 features DATA poll-

ing to indicate the end of a program cycle. During a pro-

gram cycle an attempted read of the last byte loaded will

result in the complement of the loaded data on I/O7. Once

the program cycle has been completed, true data is valid

on all outputs and the next cycle may begin. DATA polling

may begin at any time during the program cycle.

TOGGLE BIT:

In addition to DATA p o l l i n g t h e

AT29LV512 provides another method for determining the

end of a program or erase cycle. During a program or

erase operation, successive attempts to read data from

the device will result in I/O6 toggling between one and

zero. Once the program cycle has completed, I/O6 will

stop toggling and valid data will be read. Examining the

toggle bit may begin at any time during a program cycle.

OPTIONAL CHIP ERASE MODE:

The entire device

can be erased by using a 6-byte software code. Please

see Software Chip Erase application note for details.

Device Operation (Continued)

AT29LV512

4-45