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AT29C1024-12TC Datasheet(PDF) 3 Page - ATMEL Corporation

Part # AT29C1024-12TC
Description  1 Megabit 64K x 16 5-volt Only CMOS Flash Memory
Download  12 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT29C1024-12TC Datasheet(HTML) 3 Page - ATMEL Corporation

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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
with Respect to Ground .............-0.6V to VCC + 0.6V
Voltage on OE
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*
After setting SDP, any attempt to write to the device with-
out the 3-word command sequence will start the internal
write timers. No data will be written to the device; however,
for the duration of tWC, a read operation will effectively be
a polling operation.
After the software data protection’s 3-word command
code is given, a sector of data is loaded into the device
using the sector programming timing specifications.
HARDWARE DATA PROTECTION:
Hardware features
protect against inadvertent programs to the AT29C1024 in
the following ways: (a) VCC sense— if VCC is below 3.8V
(typical), the program function is inhibited. (b) VCC power
on delay— once VCC has reached the VCC sense level,
the device will automatically time out 5 ms (typical) before
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.
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-
Device Operation (Continued)
erations. In this manner, the user can have a common
board design for various Flash densities and, with each
density’s sector size in a memory map, have the system
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 AT29C1024 features DATA poll-
ing to indicate the end of a program cycle. During a pro-
gram cycle an attempted read of the last word loaded will
result in the complement of the loaded data on I/O7 and
I/O15. 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
AT29C1024 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 and I/O14 toggling between
one and zero. Once the program cycle has completed,
I/O6 and I/O14 will stop toggling and valid data will be
read. Examining the toggle bit may begin at any time dur-
ing 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.
AT29C1024
4-143


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