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LHF00L28
Table 1. Pin Descriptions
4
Symbol
A 19 -A 0
DQ 15 -DQ 0
CE#
RST#
OE#
WE#
WP#/ACC
RY/BY#
V CC
GND
NC
Type
INPUT
INPUT/
OUTPUT
INPUT
INPUT
INPUT
INPUT
INPUT/
SUPPLY
OPEN DRAIN
OUTPUT
SUPPLY
SUPPLY
Name and Function
ADDRESS INPUTS: Inputs for addresses.
DATA INPUTS/OUTPUTS: Inputs data and commands during CUI (Command User
Interface) write cycles, outputs data during memory array, status register, query code,
identifier code reads. Data pins float to high-impedance (High Z) when the chip or
outputs are deselected. Data is internally latched during an erase or program cycle.
CHIP ENABLE: Activates the device’s control logic, input buffers, decoders and sense
amplifiers. CE#-high (V IH ) deselects the device and reduces power consumption to
standby levels.
RESET: When low (V IL ), RST# resets internal automation and inhibits write operations
which provides data protection. RST#-high (V IH ) enables normal operation. After
power-up or reset mode, the device is automatically set to read array mode. RST# must
be low during power-up/down.
OUTPUT ENABLE: Gates the device’s outputs during a read cycle.
WRITE ENABLE: Controls writes to the CUI and array blocks. Addresses and data are
latched on the rising edge of CE# or WE# (whichever goes high first).
WRITE PROTECT: When WP#/ACC is V IL , locked-down blocks cannot be unlocked.
Erase or program operation can be executed to the blocks which are not locked and not
locked-down. When WP#/ACC is V IH , lock-down is disabled.
Applying 12.0V±0.3V to WP#/ACC provides fast erasing or fast programming mode. In
this mode, WP#/ACC is power supply pin. Applying 12.0V±0.3V to WP#/ACC during
erase/program can only be done for a maximum of 1,000 cycles on each block. WP#/
ACC may be connected to 12.0V±0.3V for a total of 80 hours maximum. Use of this pin
at 12.0V+0.3V beyond these limits may reduce block cycling capability or cause
permanent damage.
READY/BUSY#: Indicates the status of the internal WSM (Write State Machine). When
low, WSM is performing an internal operation (block erase, full chip erase, program or
OTP program). RY/BY#-High Z indicates that the WSM is ready for new commands,
block erase is suspended and program is inactive, program is suspended, or the device is
in reset mode.
DEVICE POWER SUPPLY (2.7V-3.6V): With V CC ≤ V LKO , all write attempts to the
flash memory are inhibited. Device operations at invalid V CC voltage (see DC
Characteristics) produce spurious results and should not be attempted.
GROUND: Do not float any ground pins.
NO CONNECT: Lead is not internally connected; it may be driven or floated.
Rev. 2.45
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