(continued)

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

sequential loading is not required.

HARDWARE DATA PROTECTION:

Hardware features

protect against inadvertent programs to the AT29BV010A

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 2.7V to 3.6V

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

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 methods of identification.

Device Operation (Continued)

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*

DATA POLLING:

The AT29BV010A features DATA

polling to indicate the end of a program cycle. During a

program 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

AT29BV010A 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 MODES:

The entire device

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

see Software Chip Erase application note for details.

BOOT BLOCK PROGRAMMING LOCKOUT:

The

AT29BV010A has two designated memory blocks that

have a programming lockout feature. This feature pre-

vents programming of data in the designated block once

the feature has been enabled. Each of these blocks con-

sists of 8K bytes; the programming lockout feature can be

set independently for either block. While the lockout fea-

ture does not have to be activated, it can be activated for

either or both blocks.

These two 8K memory sections are referred to as

boot

contained in a boot block. The AT29BV010A blocks are

located in the first 8K bytes of memory and the last 8K

bytes of memory. The boot block programming lockout

feature can therefore support systems that boot from the

lower addresses of memory or the higher addresses.

Once the programming lockout feature has been acti-

vated, the data in that block can no longer be erased or

programmed; data in other memory locations can still be

changed through the regular programming methods. To

activate the lockout feature, a series of seven program

commands to specific addresses with specific data must

be performed. Please see Boot Block Lockout Feature En-

able Algorithm.

If the boot block lockout feature has been activated on

either block, the chip erase function will be disabled.

AT29BV010A

4-5