AT49BV512-70VC View Datasheet(PDF) - Atmel Corporation
Part Name
Description
MFG CO.
'AT49BV512-70VC' PDF : 11 Pages View PDF
AT49BV512
DATA POLLING: The AT49BV512 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 pro-
gram 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 AT49BV512
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 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.
Command Definition (in Hex)
HARDWARE DATA PROTECTION: Hardware features
protect against inadvertent programs to the AT49BV512 in
the following ways: (a) VCC sense: if VCC is below 1.8V
(typical), the program function is inhibited. (b) Program
inhibit: holding any one of OE low, CE high or WE high
inhibits program cycles. (c) Noise filter: Pulses of less than
15 ns (typical) on the WE or CE inputs will not initiate a pro-
gram 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
adversely affecting the operation of the device. The I/O
lines can only be driven from 0 to VCC + 0.6V.
Command
Sequence
Read
Chip Erase
Byte
Program
Boot Block
Lockout(1)
Product ID
Entry
Bus
Cycles
1
6
4
1st Bus
Cycle
Addr Data
Addr
5555
DOUT
AA
5555 AA
2nd Bus
Cycle
Addr Data
2AAA 55
2AAA 55
3rd Bus
Cycle
Addr Data
5555 80
5555 A0
4th Bus
Cycle
Addr Data
5555 AA
Addr
DIN
5th Bus
Cycle
Addr Data
2AAA 55
6th Bus
Cycle
Addr Data
5555 10
6
5555 AA 2AAA 55 5555 80 5555 AA 2AAA 55 5555 40
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
Notes: 1. The 8K byte boot sector has the address range 0000H to 1FFFH.
2. Either one of the Product ID exit commands can be used.
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
*NOTICE:
Stresses beyond those listed under “Absolute
Maximum Ratings” may cause permanent dam-
age to the device. This is a stress rating only and
functional operation of the device at these or any
other conditions beyond those indicated in the
operational sections of this specification is not
implied. Exposure to absolute maximum rating
conditions for extended periods may affect device
reliability.
Voltage on OE
with Respect to Ground ...................................-0.6V to +13.5V
3
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