AT52BR1664-90CU Atmel, AT52BR1664-90CU Datasheet - Page 5

• Manufacturer Part Number: AT52BR1664-90CU
• Manufacturer: Atmel

Specifications of AT52BR1664-90CU

• Operating Supply Voltage (max): 3.3V
• Operating Temperature (max): 85C
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

16-megabit
Flash
Description
Device
Operation
2212C–STKD–09/02
The 16-megabit Flash memory is organized as 1,048,576 words of 16 bits each. The x16 data
appears on I/O0 - I/O15. The memory is divided into 39 sectors for erase operations. The
device has CE and OE control signals to avoid any bus contention. This device can be read or
reprogrammed using a single 2.7V power supply, making it ideally suited for in-system
programming.
The device powers on in the read mode. Command sequences are used to place the device in
other operation modes such as program and erase. The device has the capability to protect
the data in any sector. (See “Sector Lockdown” section.)
To increase the flexibility of the device, it contains an Erase Suspend and Program Suspend
feature. This feature will put the Erase or Program on hold for any amount of time and let the
user read data from or program data to any of the remaining sectors within the memory. The
end of a program or an erase cycle is detected by the Ready/Busy pin, Data Polling or by the
toggle bit.
The VPP pin provides data protection and faster programming. When the V
0.8V, the program and erase functions are inhibited. When V
program and erase operations can be performed. With V
erase operations are accelerated.
A six-byte command (Enter Single Pulse Program Mode) sequence to remove the requirement
of entering the three-byte program sequence is offered to further improve programming time.
After entering the six-byte code, only single pulses on the write control lines are required for
writing into the device. This mode (Single Pulse Word Program) is exited by powering down
the device, or by pulsing the RESET pin low for a minimum of 500 ns and then bringing it back
to V
work while in this mode; if entered, they will result in data being programmed into the device. It
is not recommended that the six-byte code reside in the software of the final product but only
exist in external programming code.
READ: The 16-megabit Flash is accessed like an EPROM. When CE and OE are low and WE
is high, the data stored at the memory location determined by the address pins are asserted
on the outputs. The outputs are put in the high-impedance state whenever CE or OE is high.
This dual-line control gives designers flexibility in preventing bus contention.
COMMAND SEQUENCES: When the device is first powered on, it will be reset to the read or
standby mode, depending upon the state of the control line inputs. In order to perform other
device functions, a series of command sequences are entered into the device. The command
sequences are shown in the “Command Definition in Hex” table on page 13 (I/O8 - I/O15 are
don’t care inputs for the command codes). The command sequences are written by applying a
low pulse on the WE or CE input with CE or WE low (respectively) and OE high. The address
is latched on the falling edge of CE or WE, whichever occurs last. The data is latched by the
first rising edge of CE or WE. Standard microprocessor write timings are used. The address
locations used in the command sequences are not affected by entering the command
sequences.
RESET: A RESET input pin is provided to ease some system applications. When RESET is at
a logic high level, the device is in its standard operating mode. A low level on the RESET input
halts the present device operation and puts the outputs of the device in a high-impedance
state. When a high level is reasserted on the RESET pin, the device returns to the read or
standby mode, depending upon the state of the control inputs.
ERASURE: Before a word can be reprogrammed, it must be erased. The erased state of
memory bits is a logical “1”. The entire device can be erased by using the Chip Erase com-
mand or individual sectors can be erased by using the Sector Erase command.
CC
. Erase, Erase Suspend/Resume, and Program Suspend/Resume commands will not
AT52BR1662(T)/1664(T)
PP
at 5.0V or 12.0V, the program and
PP
is at 1.65V or above, normal
PP
input is below
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