AT45DB011

6

Buffer to Main Memory Page Program with Built-In Erase,

Buffer to Main Memory Page Program without Built-In

Erase, Page Erase, Block Erase, Main Memory Page Pro-

gram, and Auto Page Rewrite.

The result of the most recent Main Memory Page to Buffer

Compare operation is indicated using bit 6 of the status

register. If bit 6 is a 0, then the data in the main memory

page matches the data in the buffer. If bit 6 is a 1, then at

least one bit of the data in the main memory page does not

match the data in the buffer.

The device density is indicated using bits 5, 4, and 3 of the

status register. For the AT45DB011, the three bits are 0, 0,

and 1. The decimal value of these three binary bits does

not equate to the device density; the three bits represent a

combinational code relating to differing densities of Serial

DataFlash devices, allowing a total of eight different density

configurations.

HARDWARE PAGE WRITE PROTECT: If the WP pin is

held low, the first 256 pages of the main memory cannot be

reprogrammed. The only way to reprogram the first 256

pages is to first drive the protect pin high and then use the

program commands previously mentioned. The WP pin is

internally pulled high; therefore, in low pin count applica-

tions, connection of the WP pin is not necessary if this pin

and feature will not be utilized. However, it is recom-

mended that the WP pin be driven high externally when-

ever possible.

RESET: A low state on the reset pin (RESET) will terminate

the operation in progress and reset the internal state

machine to an idle state. The device will remain in the reset

condition as long as a low level is present on the RESET

pin. Normal operation can resume once the RESET pin is

brought back to a high level.

The device incorporates an internal power-on reset circuit,

so there are no restrictions on the RESET pin during

power-on sequences. The RESET pin is also internally

pulled high; therefore, in low pin count applications, con-

nection of the RESET pin is not necessary if this pin and

feature will not be utilized. However, it is recommended

that the RESET pin be driven high externally whenever

possible.

READY/BUSY: This open drain output pin will be driven

low when the device is busy in an internally self-timed oper-

ation. This pin, which is normally in a high state (through an

external pull-up resistor), will be pulled low during program-

ming operations, compare operations, and during page-to-

buffer transfers.

The busy status indicates that the Flash memory array and

the buffer cannot be accessed.

Power On/Reset State

When power is first applied to the device, or when recover-

ing from a reset condition, the device will default to SPI

mode 3. In addition, the SO pin will be in a high impedance

state, and a high to low transition on the CS pin will be

required to start a valid instruction. The SPI mode will be

automatically selected on every falling edge of CS by sam-

pling the inactive clock state.

Note:

ational mode is started.

Status Register Format

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

RDY/BUSY

COMP

0

0

1

XXX

Absolute Maximum Ratings*

Temperature Under Bias ................................ -55

°C to +125°C

*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.

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 V

DC and AC Operating Range

AT45DB011

Operating Temperature (Case)

Com.

0

°C to 70°C

Ind.

-40

°C to 85°C

V

(1)

2.7V to 3.6V