AT49F4096 Ver la hoja de datos (PDF) - Atmel Corporation
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AT49F4096 Datasheet PDF : 11 Pages
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Device Operation (Continued)
HARDWARE DATA PROTECTION: Hardware features
protect against inadvertent programs to the AT49F4096 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 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.
Command Definition (in Hex) (1)
Command Bus
Sequence 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
1
Chip Erase 6
Addr DOUT
5555 AA 2AAA 55 5555 80 5555 AA 2AAA 55 5555 10
Sector
Erase
6
5555
AA 2AAA
55
5555
80
5555
AA 2AAA
55 SA (4, 5) 30
Word
Program
4
5555 AA 2AAA 55 5555 A0 Addr DIN
Boot Block
Lockout (2)
6
5555 AA 2AAA 55 5555 80 5555 AA 2AAA 55 5555 40
Product ID
3
Entry
5555 AA 2AAA 55 5555 90
Product ID
Exit (3)
3
5555 AA 2AAA 55 5555 F0
Product ID
Exit (3)
1
xxxx F0
Notes: 1. The DATA FORMAT in each bus cycle is as follows:
I/O15 - I/O8 (Don’t Care); I/O7 - I/O0 (Hex)
2. The 8K word boot sector has the address range
00000H to 01FFFH.
3. Either one of the Product ID Exit commands can
be used.
4. SA = sector addresses:
SA = 03XXX for PARAMETER BLOCK 1
SA = 05XXX for PARAMETER BLOCK 2
SA = 3FXXX for MAIN MEMORY ARRAY
5. When the boot block programming lockout feature
is not enabled, the boot block and the main memory block
will erase together (from the same sector erase command).
Once the boot region has been protected, only the main
memory array sector will erase when its sector erase
command is issued.
Absolute Maximum Ratings*
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.
4-222
AT49F4096
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