28F016SA datasheet(9/55 Pages) INTEL

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28F016SA

2.1 Lead Descriptions (Continued)

Symbol

Type

Name and Function

RY/BY#

OPEN DRAIN

OUTPUT

READY/BUSY: Indicates status of the internal WSM. When low, it

indicates that the WSM is busy performing an operation. RY/BY# high

indicates that the WSM is ready for new operations (or WSM has

completed all pending operations), or block erase is suspended, or the

device is in deep power-down mode. This output is always active (i.e., not

floated to tri-state off when OE# or CE0#,CE1# are high), except if a

RY/BY# Pin Disable command is issued.

WP#

INPUT

WRITE PROTECT: Erase blocks can be locked by writing a nonvolatile

lock-bit for each block. When WP# is low, those locked blocks as

reflected by the Block-Lock Status bits (BSR.6), are protected from

inadvertent data programs or block erases. When WP# is high, all blocks

can be written or erased regardless of the state of the lock-bits. The WP#

input buffer is disabled when RP# transitions low (deep power-down

mode).

BYTE#

INPUT

BYTE ENABLE: BYTE# low places device in x8 mode. All data is then

input or output on DQ0–7, and DQ8–15 float. Address A0 selects between

the high and low byte. BYTE# high places the device in x16 mode, and

turns off the A0 input buffer. Address A1 then becomes the lowest order

address.

3/5#

INPUT

3.3/5.0 VOLT SELECT: 3/5# high configures internal circuits for 3.3V

operation. 3/5# low configures internal circuits for 5.0V operation.

NOTES:

Reading the array with 3/5# high in a 5.0V system could damage the

device.

There is a significant delay from 3/5# switching to valid data.

VPP

SUPPLY

ERASE/PROGRAM POWER SUPPLY: For erasing memory array blocks

or writing words/bytes/pages into the flash array.

VCC

SUPPLY

DEVICE POWER SUPPLY (3.3V ± 10%, 5.0V ± 10%, 5.0V ± 5%):

Do not leave any power pins floating.

GND

SUPPLY

GROUND FOR ALL INTERNAL CIRCUITRY:

Do not leave any ground pins floating.

NO CONNECT:

Lead may be driven or left floating.

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