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AT49F040 Datasheet(PDF) 3 Page - ATMEL Corporation

Part No. AT49F040
Description  4 Megabit 512K x 8 5-volt Only CMOS Flash Memory
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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AT49F040 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*
PRODUCT IDENTIFICATION: The product identification
mode identifies the device and manufacturer as Atmel. It
may be accessed by hardware or software operation. The
hardware operation mode can be used by an external pro-
grammer to identify the correct programming algorithm for
the Atmel product.
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 AT49F040 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 polling the AT49F040
provides another method for determining the end of a pro-
gram or erase cycle. During a program or erase operation,
successive attempts to read data from the device will re-
sult in I/O6 toggling between one and zero. Once the pro-
gram 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.
HARDWARE DATA PROTECTION: Hardware features
protect against inadvertent programs to the AT49F040 in
the following ways: (a) VCC sense: if VCC is below 3.8V
(typical), the program function is inhibited. (b) Program in-
hibit: holding any one of OE low, CE high or WE high in-
hibits program cycles. (c) Noise filter: pulses of less than
15 ns (typical) on the WE or CE inputs will not initiate a
program cycle.
Device Operation (Continued)
Command Definition (in Hex)
Command
Sequence
Bus
Cycles
1st Bus
Cycle
2nd Bus
Cycle
3rd Bus
Cycle
4th Bus
Cycle
5th Bus
Cycle
6th Bus
Cycle
Addr
Data
Addr
Data
Addr
Data
Addr
Data
Addr
Data
Addr
Data
Read
1Addr
DOUT
Chip Erase
6
5555
AA
2AAA
55
5555
80
5555
AA
2AAA
55
5555
10
Byte
Program
4
5555
AA
2AAA
55
5555
A0
Addr
DIN
Boot Block
Lockout
(1)
6
5555
AA
2AAA
55
5555
80
5555
AA
2AAA
55
5555
40
Product ID
Entry
3
5555
AA
2AAA
55
5555
90
Product ID
Exit
(2)
3
5555
AA
2AAA
55
5555
F0
Product ID
Exit
(2)
1
XXXX
F0
Note:
1. The 16K byte boot sector has the address range 00000H to 03FFFH.
2. Either one of the Product ID exit commands can be used.
AT49F040
4-211


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