LH28F800SU
8M (512K × 16, 1M × 8) Flash Memory
PIN DESCRIPTION
SYMBOL
TYPE
NAME AND FUNCTION
BYTE-SELECT ADDRESS:
Selects between high and low byte when device is in x8
mode. This address is latched in x8 Data Writes. Not used in x16 mode (i.e., the
A
0
input buffer is turned off when BYTE is high).
WORD-SELECT ADDRESSES:
Select a word within one 64K block. A
6
- A
15
selects
1 of 1024 rows, and A
1
- A
5
selects 16 of 512 columns. These addresses are
latched during Data Writes.
BLOCK-SELECT ADDRESSES:
Select 1 of 16 Erase blocks. These addresses are
latched during Data Writes, Erase and Lock-Block operations.
LOW-BYTE DATA BUS:
Inputs data and commands during CUI write cycles.
Outputs array, buffer, identifier or status data in the appropriate Read mode. Floated
when the chip is de-selected or the outputs are disabled.
HIGH-BYTE DATA BUS
: Inputs data during x16 Data-Write operations. Outputs
array, buffer or identifier data in the appropriate Read mode; not used for Status
register reads. Floated when the chip is de-selected or the outputs are disabled.
CHIP ENABLE INPUTS
: Activate the device’s control logic, input buffers, decoders and
sense amplifiers. With either CE
»
0
or CE
»
1
high, the device is de-selected and power
consumption reduces to Standby levels upon completion of any current Data-Write or
Erase operations. Both CE
»
0
, CE
»
1
must be low to select the device. All timing
specifications are the same for both signals. Device Selection occurs with the latter
falling edge of CE
»
0
or CE
»
1
. The first rising edge of CE
»
0
or CE
»
1
disables the device.
RESET/POWER-DOWN:
With RP
»
low, the device is reset, any current operation is
aborted and device is put into the deep power down mode. When the power is turned
on, RP
»
pin is turned to low in order to return the device to default configuration. When
the 3/5
»
pin is switched, or when the power transition is occurred, or at the power on/off,
RP
»
is required to stay low in order to protect data from noise. When returning from
Deep Power-Down, a recovery time of 400 ns (V
CC
+5.0 V ±0.25 V) is required to allow
these circuits to power-up. When RP
»
goes low, any current or pending WSM
operation(s) are terminated, and the device is reset. All Status registers return to ready
(with all status flags cleared). After returning, the device is in read array mode.
OUTPUT ENABLE:
Gates device data through the output buffers when low. The
outputs float to tri-state off when OE
»
is high.
NOTE:
CE
»
X
overrides OE
»
, and OE
»
overrides WE.
WRITE ENABLE:
Controls access to the CUI, Page Buffers, Data Queue Registers
and Address Queue Latches. WE is active low, and latches both address and data
(command or array) on its rising edge.
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 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 CE
»
0
, CE
»
1
are high), except if a RY
»
/BY
»
Pin Disable command is issued.
A
0
INPUT
A
1
- A
15
INPUT
A
16
- A
19
INPUT
DQ
0
- DQ
7
INPUT/OUTPUT
DQ
8
- DQ
15
INPUT/OUTPUT
CE
»
0
, CE
»
1
INPUT
RP
»
INPUT
OE
»
INPUT
WE
INPUT
RY
»
/BY
»
OPEN DRAIN
OUTPUT
4
SHARP [ SHARP ELECTRIONIC COMPONENTS ]
