LE25FV101T. 25FV101T Datasheet
t4U.c1M (128k words × 8bits) Serial Flash EEPROM
CMOS Flash EEPROM Technology
aSingle 3.3-Volt Read and Write Operations
.DSector Erase Capability: 256 Bytes per sector
wOperating Frequency: 10MHz
wLow Power Consumption
w Active Current (Read): 25 mA (Max.)
High Read/Write Reliability
Sector-write Endurance Cycles: 104
10 Years Data Retention
Self-timed Erase and Programming
Byte Programming: 35 µs (Max.)
End of Write Detection: Status Register Read
Standby Current: 20 µA (Max.)
Serial Peripheral Interface (S.P.I.) mode 0.
Hardware Data Protection
Packages Available: MSOP8(225mil)
The LE25FV101T is a 128K x 8 CMOS sector
Uerase, byte programmable serial Flash EEPROM.
t4The LE25FV101T is manufactured using SANYO's
proprietary, high performance CMOS Flash
eEEPROM technology. Breakthroughs in EEPROM
cell design and process architecture attain better
ereliability and manufacturability compared with
conventional approaches. The LE25FV101T erases
hand programs with a 3.3-volt only power supply.
SLE25FV101T conforms to Serial Peripheral Interface
taFeaturing high performance programming, the
aLE25FV101T typically byte programs in 35 µs. The
LE25FV101T typically sector (256 bytes) erases in
.D4ms. Both program and erase times can be
optimized using interface feature such as Status
Register to indicate the completion of the write cycle.
wTo protect against an inadvertent write, the
LE25FV101T has on chip hardware data protection
wscheme. Designed, manufactured, and tested for a
wide spectrum of applications, the LE25FV101T is
woffered with a guaranteed sector write endurance of
Commands are used to initiate the memory
operation functions of the device. Commands are
written to the command register through serial input
(SI). The addresses and data of Commands are
latched to be used to operate functions such as
Read, Sector_Erase, Byte_Program and so on.
Fig.3 and Fig.4 contain the timing waveforms of
serial input and output. By setting CS to LOW, the
device is selected. And commands, addresses, and
dummy bits can be let in serially through SI port.
When the device is in Read or Status Register Read
mode, SO pin is in Low-impedance state. And the
requested data can be read out from MSB (most
significant bit) synchronously with the falling edge of
104 cycles. Data retention is rated greater than 10
.coThe LE25FV101T is best suited for applications
Uthat require re-programmable nonvolatile mass
t4storage of program or data memory.
Figure1: Pin Assignment for 8-pin MSOP
ataShee*This product incorporate technology licensed from Silicon Storage Technology, Inc.
This preliminary specification is subject to change without notice.
.DSANYO Electric Co., Ltd. Semiconductor Company
w1-1, 1 Chome, Sakata, Oizumi-machi, Ora-gun, GUNMA, 370-0596 JAPAN
wwRevision c-November 1,1999-KI/ki-1/9
3.3V-only 1M-Bit Serial Flash EEPROM
CS SCK SI
SO WP RESET
Figure2: Functional Block Diagram of LE25FV101T
Table1: Pin Description
Symbol Pin Description
SCK Serial Clock
SI Serial Input
SO Serial Output
CS Chip Select
WP Write Protect
To control the timing of serial data input and output.
To latch input data and addresses synchronously at the rising edge of SCK, and read
out output data synchronously at this falling edge.
To input data or addresses serially from MSB to LSB (Least Significant Bit).
To output data serially from MSB to LSB.
To activate the device when this pin is LOW.
To deselect and put the device to standby mode when High.
To prevent inadvertent write when this pin is LOW.
As WP is connected internally to the Vcc, leave this pin open when this function is
To provide 3.0V to 3.6V supply.
To prevent inadvertent writes by setting this pin to LOW during system power-up.
As RESET is connected to Vcc internally, leave this pin open when this function is
Table2: Commands Summary
1st bus cycle 2nd bus cycle 3rd bus cycle 4th bus cycle 5th bus cycle 6th bus cycle
Address Data / OPcode Dummy
Definition for table 2:
1. X= don't care, H= number in hex.
2. A17-A23=don't care
3. PD= Program data
4. Reset Command is effective when the device is only in Erase or Program sequence (in tBP or tSE period).
SANYO Electric Co., Ltd.
3.3V-only 1M-Bit Serial Flash EEPROM
Table 2 contains a command list and a brief summary
of the commands. The following is a detailed description
of the options initiated by each command.
Fig.5 shows the timing waveform of read operation.
The read operation is initiated by READ command. After
writing OPcode of “FFH” and following 24bit address and
16 dummy bits, SO is transformed into Low-impedance
state, and the specified addresses’ data are read out
synchronously with SCK clock. While the SCK clock is
continuously on, the device counts up the next address
automatically and reads the data in order. When the
address reaches its maximum, while the read operation
still be continuing, the address is reset to the lowest one,
and the device continues reading data from the beginning.
When CS is set High so as to deselect the device,
the read operation terminates with the output in High-
impedance state. Do not execute read operation while the
device is in Byte_Program or Sector_Erase Cycle to
prevent inadvertent writes.
Fig.6 shows the timing waveform of Status_Register
Status_Register can be read while the device is in
Program or Erase mode. As is shown in the table below,
the LSB (Least Significant Bit) of Status_Register is set to
BSY with other bits intact. By setting CS to LOW and
writing “9FH” in command register, the contents of the
Status_Register come out from MSB. The LSB of the
Status_Register stands for if the device is busy or not.
Therefore,”0” stands for busy and “1” for not in Program or
Erase mode. When CS goes High, Status Register
reading terminates with the output pin in High-impedance
5 4 3 2 1 0(LSB)
Fig.7 shows the timing waveform of Sector_Erase.
Sector_Erase command consists of 6 bus cycles from 1st
bus cycle to 6th bus cycle. This command stages the
device for electrical erasing of all bytes within a sector. A
sector contains 256 bytes. This sector erasability
enhances the flexibility and usefulness of the
LE25FV101T, since most applications only need to
change a small number of bytes or sectors, not the
entire chip. To execute the Sector_Erase operation, erase
address, 2nd OPcode (D0H) and Dummy bits must be
written to the command register after writing 1st OPcode
of (20H). This two-step sequence ensures that only
memory contents within the addressed sector are erased
and other sectors are not inadvertently erased. The erase
operation begins with the rising edge of the CS pulse and
terminates automatically by using an internal timer.
Termination of this mode is found out by using Status
Fig.8 shows the timing waveform of Byte_Program.
Byte_Program command consists of 6 bus cycles from 1st
bus cycle to 6th bus cycle, and stages the device for Byte
programmable. To execute the Byte_Program operation,
program address, program data and Dummy bits must be
written to the command register after writing the OPcode
of (10H). The program operation begins with the rising
edge of the CS pulse and terminates automatically by
using an internal timer. Termination of this mode is found
out by using Status Register Read.
Fig.9 shows the timing waveform of Reset operation.
Reset operation is effective while the device is already in
Program or Erase mode. But the data of specified
address are not guaranteed. The Reset Command can be
provided as a means to safely abort the Erase or Program
Command sequences. Following 4th bus cycles (erase or
program) with a write of (FFH) in 5th bus cycle will safely
abort the operation. Memory contents will not be altered.
Hardware Write Protection
Setting WP to LOW prevents inadvertent writes by
inhibiting write operation. As WP is connected internally to
the Vcc, don’t connect externally to any nodes when this
function is not necessary. To prevent inadvertent writes
during system power-up, LE25FV101T has power-on-
To perform power up more safely, the usage of
RESET is recommended as follows. By holding RESET
LOW during system power up and setting to High after
Vcc reaches operation voltage, inadvertent writes can be
prevented (see Fig.10). Don’t use this function except
during power up. As RESET is connected to Vcc
internally, don’t connect externally to any nodes when this
function is not necessary.
Ceramic capacitors (0.1 µF) must be added between
VCC and VSS to each device to assure stable flash memory
SANYO Electric Co., Ltd.