25LC040-I/SN Microchip Technology, 25LC040-I/SN Datasheet - Page 7
![no-image](/images/manufacturer_photos/0/4/439/microchip_technology_sml.jpg)
25LC040-I/SN
Manufacturer Part Number
25LC040-I/SN
Description
IC EEPROM 4KBIT 2MHZ 8SOIC
Manufacturer
Microchip Technology
Datasheet
1.25LC040SN.pdf
(22 pages)
Specifications of 25LC040-I/SN
Memory Size
4K (512 x 8)
Package / Case
8-SOIC (3.9mm Width)
Operating Temperature
-40°C ~ 85°C
Format - Memory
EEPROMs - Serial
Memory Type
EEPROM
Speed
2MHz
Interface
SPI, 3-Wire Serial
Voltage - Supply
2.5 V ~ 5.5 V
Organization
512 x 8
Interface Type
SPI
Maximum Clock Frequency
2 MHz
Access Time
230 ns
Supply Voltage (max)
5.5 V
Supply Voltage (min)
2.5 V
Maximum Operating Current
5 mA
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Operating Supply Voltage
2.5 V
Package
8SOIC N
Density
4 Kb
Maximum Operating Frequency
2 MHz
Maximum Random Access Time
230 ns
Typical Operating Supply Voltage
3.3|5 V
Data Retention
200(Min) Year
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
25LC040-I/SN
Manufacturer:
MCP
Quantity:
27 464
Company:
Part Number:
25LC040-I/SN
Manufacturer:
MICROCHI
Quantity:
100
Part Number:
25LC040-I/SN
Manufacturer:
MICROCHIP/微芯
Quantity:
20 000
3.0
3.1
The 25XX040 is a 512 byte Serial EEPROM designed
to interface directly with the Serial Peripheral Interface
(SPI) port of many of today’s popular microcontroller
families, including Microchip’s PIC16C6X/7X micro-
controllers. It may also interface with microcontrollers
that do not have a built-in SPI port by using discrete
I/O lines programmed properly with the software.
The 25XX040 contains an 8-bit instruction register. The
part is accessed via the SI pin, with data being clocked
in on the rising edge of SCK. The CS pin must be low
and the HOLD pin must be high for the entire operation.
The WP pin must be held high to allow writing to the
memory array.
Table 3-1 contains a list of the possible instruction
bytes and format for device operation. The Most
Significant address bit (A8) is located in the instruction
byte. All instructions, addresses, and data are
transferred MSB first, LSB last.
Data is sampled on the first rising edge of SCK after CS
goes low. If the clock line is shared with other periph-
eral devices on the SPI bus, the user can assert the
HOLD input and place the 25XX040 in ‘HOLD’ mode.
After releasing the HOLD pin, operation will resume
from the point when the HOLD was asserted.
3.2
The part is selected by pulling CS low. The 8-bit READ
instruction with the A8 address bit is transmitted to the
25XX040 followed by the lower 8-bit address (A7
through A0). After the correct READ instruction and
address are sent, the data stored in the memory at the
selected address is shifted out on the SO pin. The data
stored in the memory at the next address can be read
sequentially by continuing to provide clock pulses. The
internal Address Pointer is automatically incremented
to the next higher address after each byte of data is
shifted out. When the highest address is reached
(01FFh), the address counter rolls over to address
0000h allowing the read cycle to be continued
indefinitely. The read operation is terminated by raising
the CS pin (Figure 3-1).
TABLE 3-1:
© 2006 Microchip Technology Inc.
Instruction Name
Note:
WRITE
READ
WRDI
WREN
RDSR
WRSR
FUNCTIONAL DESCRIPTION
Principles of Operation
Read Sequence
A
8
is the 9
INSTRUCTION SET
th
address bit necessary to fully address 512 bytes.
Instruction Format
0000 A
0000 A
0000 0100
0000 0110
0000 0101
0000 0001
8
8
011
010
25AA040/25LC040/25C040
Read data from memory array beginning at selected address
Write data to memory array beginning at selected address
Reset the write enable latch (disable write operations)
Set the write enable latch (enable write operations)
Read STATUS register
Write STATUS register
3.3
Prior to any attempt to write data to the 25XX040, the
write enable latch must be set by issuing the WREN
instruction (Figure 3-4). This is done by setting CS low
and then clocking out the proper instruction into the
25XX040. After all eight bits of the instruction are
transmitted, the CS must be brought high to set the
write enable latch. If the write operation is initiated
immediately after the WREN instruction without CS
being brought high, the data will not be written to the
array because the write enable latch will not have been
properly set.
Once the write enable latch is set, the user may
proceed by setting the CS low, issuing a WRITE
instruction, followed by the address, and then the data
to be written. Keep in mind that the Most Significant
address bit (A8) is included in the instruction byte. Up
to 16 bytes of data can be sent to the 25XX040 before
a write cycle is necessary. The only restriction is that all
of the bytes must reside in the same page. A page
address begins with
1111
1111
to the first address of the page and overwrite any data
in the page that may have been written.
For the data to be actually written to the array, the CS
must be brought high after the least significant bit (D0)
of the n
brought high at any other time, the write operation will
not be completed. Refer to Figure 3-2 and Figure 3-3
for more detailed illustrations on the byte write
sequence and the page write sequence respectively.
While the write is in progress, the STATUS register may
be read to check the status of the WIP, WEL, BP1 and
BP0 bits (Figure 3-6). A read attempt of a memory
array location will not be possible during a write cycle.
When the write cycle is completed, the write enable
latch is reset.
. If the internal address counter reaches
and the clock continues, the counter will roll back
th
Write Sequence
data byte has been clocked in. If CS is
Description
XXXX 0000
and ends with
DS21204E-page 7
XXXX
XXXX