HY29LV400 Datasheet, PDF (3/40 Pages) Hynix Semiconductor – 4 Mbit (512K x 8/256K x 16) Low Voltage Flash Memory

BLOCK DIAGRAM
A[17:0, 1]
DQ[15:0]
WE#
CE#
OE#
BYTE#
RESET#
RY/BY#
STATE
CONTROL
COMMAND
REGISTER
V_CC DETECTOR
ERASE VOLTAGE
GENERATOR AND
SECTOR SWITCHES
I/O CONTROL
PROGRAM
VOLTAGE
GENERATOR
Y-DECODER
TIMER
A[17:0, -1]
X-DECODER
HY29LV400
DQ[15:0]
I/O BUFFERS
DATA LATCH
Y-GATING
4 Mb FLASH
MEMORY
ARRAY
(11 Sectors)
SIGNAL DESCRIPTIONS
Name
A[17:0]
DQ[15]/A[-1],
DQ[14:0]
BYTE#
CE#
OE#
WE#
RESET#
RY/BY#
V_CC
V_SS
Type
Description
Inputs
Address, active High. These 18 inputs, combined with the DQ[15]/A[-1] input in
Byte mode, select one location within the array for read or write operations.
Inputs/Outputs
Tri-state
Data Bus, active High. These pins provide an 8- or 16-bit data path for read
and write operations. In Byte mode, DQ[15]/A[-1] is used as the LSB of the 19-bit
byte address input. DQ[14:8] are unused and remain tri-stated in Byte mode.
Input
Byte Mode, active Low. Low selects Byte mode, High selects Word mode.
Input
Chip Enable, active Low. This input must be asserted to read data from or
write data to the HY29LV400. When High, the data bus is tri-stated and the
device is placed in the Standby mode.
Input
Output Enable, active Low. Asserted for read operations and negated for
write operations. BYTE# determines whether a byte or a word is read during the
read operation.
Input
Write Enable, active Low. Controls writing of commands or command
sequences in order to program data or erase sectors of the memory array. A write
operation takes place when WE# is asserted while CE# is Low and OE# is High.
Input
Hardware Reset, active Low. Provides a hardware method of resetting the
HY29LV400 to the read array state. When the device is reset, it immediately
terminates any operation in progress. While RESET# is asserted, the device
will be in the Standby mode.
Output
Open Drain
Ready/Busy Status. Indicates whether a write or erase command is in
progress or has been completed. Remains Low while the device is actively
programming data or erasing, and goes High when it is ready to read array data.
--
3-volt (nominal) power supply.
--
Power and signal ground.
Rev. 1.0/Nov. 01
3