28F016SV FlashFile™ MEMORY
E
2.1 Lead Descriptions (Continued)
Symbol
Type
Name and Function
RY/BY#
OPEN DRAIN READY/BUSY: Indicates status of the internal WSM. When low, it
OUTPUT
INPUT
indicates that the WSM is busy performing an operation. RY/BY# floating
indicates that the WSM is ready for new operations (or WSM has
completed all pending operations), or 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#
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 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#
3/5#
INPUT
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.
3.3/5.0 VOLT SELECT: 3/5# high configures internal circuits for 3.3V
operation. 3/5# low configures internal circuits for 5V operation.
NOTE:
Reading the array with 3/5# high in a 5V system could damage the
device. Reference the power-up and reset timings (Section 5.7) for 3/5#
switching delay to valid data.
VPP
SUPPLY
PROGRAM/ERASE POWER SUPPLY (12V ± 0.6V, 5V ± 0.5V) : For
erasing memory array blocks or writing words/bytes/pages into the flash
array. VPP = 5V ± 0.5V eliminates the need for a 12V converter, while
connection to 12V ± 0.6V maximizes Program/Erase Performance.
NOTE:
Successful completion of program and erase attempts is inhibited with
VPP at or below 1.5V. Program and erase attempts with VPP between 1.5V
and 4.5V, between 5.5V and 11.4V, and above 12.6V produce spurious
results and should not be attempted.
VCC
SUPPLY
DEVICE POWER SUPPLY (3.3V ± 0.3V, 5V ± 0.5V, 5.0 ± 0.25V):
To switch 3.3V to 5V (or vice versa), first ramp VCC down to GND, and
then power to the new VCC voltage.
Do not leave any power pins floating.
GND
NC
SUPPLY
GROUND FOR ALL INTERNAL CIRCUITRY:
Do not leave any ground pins floating.
NO CONNECT:
Lead may be driven or left floating.
12
INTEL [ INTEL ]
