25LC640A-E/MF_技术文档

25AA640A/25LC640A

64K SPI Bus Serial EEPROM

Device Selection Table

Part Number

VCC Range

Page Size

Temp. Ranges

Packages

25LC640A

25AA640A

2.5-5.5V

1.8-5.5V

32 Byte

I,E

I

P, SN, ST, MS, MF, MNY

Features:

Description:

• Max. Clock 10 MHz

The Microchip Technology Inc. 25AA640A/25LC640A

(25XX640A^*) are 64 kbit Serial Electrically Erasable

PROMs. The memory is accessed via a simple Serial

Peripheral Interface (SPI) compatible serial bus. The

bus signals required are a clock input (SCK) plus sep-

arate data in (SI) and data out (SO) lines. Access to the

device is controlled through a Chip Select (CS) input.

• Low-Power CMOS Technology

- Max. Write Current: 5 mA at 5.5V, 10 MHz

- Read Current: 5 mA at 5.5V, 10 MHz

- Standby Current: 1 μA at 5.5V

• 8192 x 8-bit Organization

• 32 Byte Page

Communication to the device can be paused via the

hold pin (HOLD). While the device is paused, transi-

tions on its inputs will be ignored, with the exception of

Chip Select, allowing the host to service higher priority

interrupts.

• Self-Timed Erase and Write Cycles (5 ms max.)

• Block Write Protection

- Protect none, 1/4, 1/2 or all of array

• Built-In Write Protection

The 25XX640A is available in standard packages

including 8-lead PDIP and SOIC, and advanced

packaging including 8-lead MSOP, 8-lead TSSOP, DFN

and TDFN.

- Power-on/off data protection circuitry

- Write enable latch

- Write-protect pin

• Sequential Read

• High Reliability

Package Types (not to scale)

- Endurance: 1,000,000 erase/write cycles

- Data retention: > 200 years

- ESD protection: > 4000V

• Temperature Ranges Supported:

PDIP/SOIC

(P, SN)

TSSOP/MSOP

(ST, MS)

1

2

3

4

8

7

6

5

CS

SO

WP

V

CC

CS

SO

WP

1

2

3

4

8

7

6

5

VCC

HOLD

SCK

SI

HOLD

SCK

SI

- Industrial (I):

-40°C to +85°C

VSS

- Automotive (E):

-40°C to +125°C

VSS

DFN/TDFN

(MF/MNY)

X-Rotated TSSOP

(X/ST)

1

CS

SO

8

VCC

1

2

3

4

8

7

6

5

HOLD

SCK

SI

2

3

4

7

6

5

V

CC

HOLD

SCK

SI

CS

SO

VSS

WP

VSS

WP

* 25XX640A is used in this document as a generic part number

for the 25AA640A, 25LC640A devices.

DS21830D-page 1

25AA640A/25LC640A

1.0

ELECTRICAL CHARACTERISTICS

(†)

Absolute Maximum Ratings

VCC.............................................................................................................................................................................6.5V

All inputs and outputs w.r.t. VSS ......................................................................................................... -0.6V to VCC +1.0V

Storage temperature .................................................................................................................................-65°C to 150°C

Ambient temperature under bias...............................................................................................................-40°C to 125°C

ESD protection on all pins..........................................................................................................................................4 kV

† NOTICE: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the

device. This is a stress rating only and functional operation of the device at those or any other conditions above those

indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for an

extended period of time may affect device reliability.

TABLE 1-1:

DC CHARACTERISTICS

Industrial (I):

Automotive (E): TA = -40°C to +125°C

TA = -40°C to +85°C

VCC = 1.8V to 5.5V

VCC = 2.5V to 5.5V

DC CHARACTERISTICS

Param.

No.

Sym.

Characteristic

Min.

Max.

Units

Test Conditions

D001

VIH1

High-level input

voltage

.7 VCC

VCC +1

V

D002

D003

D004

D005

D006

VIL1

VIL2

VOL

VOH

Low-level input

voltage

-0.3

0.3 VCC

0.2 VCC

0.4

V

VCC ≥ 2.7V

VCC < 2.7V

Low-level output

voltage

—

IOL = 2.1 mA

—

0.2

IOL = 1.0 mA, VCC < 2.5V

IOH = -400 μA

High-level output

voltage

VCC -0.5

—

D007

D008

ILI

Input leakage current

—

±1

μA

CS = VCC, VIN = VSS or VCC

CS = VCC, VOUT = VSS or VCC

ILO

Output leakage

current

D009

D010

CINT

Internal Capacitance

(all inputs and

outputs)

—

7

pF

TA = 25°C, CLK = 1.0 MHz,

VCC = 5.0V (Note)

ICC Read

—

5

mA

VCC = 5.5V; FCLK = 10.0 MHz;

SO = Open

VCC = 2.5V; FCLK = 5.0 MHz;

SO = Open

Operating Current

Standby Current

2.5

D011

D012

ICC Write

ICCS

—

5

3

mA

VCC = 5.5V

VCC = 2.5V

—

5

μA

CS = VCC = 5.5V, Inputs tied to VCC or

VSS, 125°C

1

μA

CS = VCC = 5.5V, Inputs tied to VCC or

VSS, 85°C

Note:

This parameter is periodically sampled and not 100% tested.

DS21830D-page 2

25AA640A/25LC640A

TABLE 1-2:

AC CHARACTERISTICS

Industrial (I):

Automotive (E): TA = -40°C to +125°C

TA = -40°C to +85°C

VCC = 1.8V to 5.5V

VCC = 2.5V to 5.5V

AC CHARACTERISTICS

Param.

Sym.

Characteristic

Min.

Max.

Units

Test Conditions

No.

1

2

3

FCLK Clock frequency

—

10

5

3

MHz 4.5V ≤ Vcc ≤ 5.5V

MHz 2.5V ≤ Vcc < 4.5V

MHz 1.8V ≤ Vcc < 2.5V

TCSS CS setup time

TCSH CS hold time

TCSD CS disable time

50

100

150

—

ns

4.5V ≤ Vcc ≤ 5.5V

2.5V ≤ Vcc < 4.5V

1.8V ≤ Vcc < 2.5V

100

200

250

—

ns

4.5V ≤ Vcc ≤ 5.5V

2.5V ≤ Vcc < 4.5V

1.8V ≤ Vcc < 2.5V

4

5

50

—

ns

—

Tsu

Data setup time

10

20

30

—

ns

4.5V ≤ Vcc ≤ 5.5V

2.5V ≤ Vcc < 4.5V

1.8V ≤ Vcc < 2.5V

6

THD

Data hold time

20

40

50

—

ns

4.5V ≤ Vcc ≤ 5.5V

2.5V ≤ Vcc < 4.5V

1.8V ≤ Vcc < 2.5V

7

8

9

TR

TF

CLK rise time

CLK fall time

Clock high time

—

100

ns

(Note 1)

THI

50

100

150

—

ns

4.5V ≤ Vcc ≤ 5.5V

2.5V ≤ Vcc < 4.5V

1.8V ≤ Vcc < 2.5V

10

TLO

Clock low time

50

100

150

—

ns

4.5V ≤ Vcc ≤ 5.5V

2.5V ≤ Vcc < 4.5V

1.8V ≤ Vcc < 2.5V

11

12

13

TCLD Clock delay time

50

—

ns

—

TCLE

TV

Clock enable time

Output valid from clock

low

—

50

100

160

ns

4.5V ≤ Vcc ≤ 5.5V

2.5V ≤ Vcc < 4.5V

1.8V ≤ Vcc < 2.5V

14

15

THO

TDIS

Output hold time

0

—

ns

(Note 1)

Output disable time

—

40

80

160

ns

4.5V ≤ Vcc ≤ 5.5V(Note 1)

2.5V ≤ Vcc ≤ 4.5V(Note 1)

1.8V ≤ Vcc ≤ 2.5V(Note 1)

16

THS

HOLD setup time

20

40

80

—

ns

4.5V ≤ Vcc ≤ 5.5V

2.5V ≤ Vcc < 4.5V

1.8V ≤ Vcc < 2.5V

Note 1: This parameter is periodically sampled and not 100% tested.

2: This parameter is not tested but ensured by characterization. For endurance estimates in a specific

application, please consult the Total Endurance™ Model which can be obtained from Microchip’s web site

at www.microchip.com.

3: TWC begins on the rising edge of CS after a valid write sequence and ends when the internal write cycle

is complete.

DS21830D-page 3

25AA640A/25LC640A

TABLE 1-2:

AC CHARACTERISTICS (CONTINUED)

Industrial (I):

Automotive (E): TA = -40°C to +125°C

TA = -40°C to +85°C

VCC = 1.8V to 5.5V

VCC = 2.5V to 5.5V

AC CHARACTERISTICS

Param.

Sym.

Characteristic

Min.

Max.

Units

Test Conditions

No.

17

THH

HOLD hold time

20

40

80

—

ns

4.5V ≤ Vcc ≤ 5.5V

2.5V ≤ Vcc < 4.5V

1.8V ≤ Vcc < 2.5V

18

19

THZ

THV

HOLD low to output

High-Z

30

60

160

—

ns

4.5V ≤ Vcc ≤ 5.5V(Note 1)

2.5V ≤ Vcc < 4.5V(Note 1)

1.8V ≤ Vcc < 2.5V(Note 1)

HOLD high to output valid

30

60

160

—

ns

4.5V ≤ Vcc ≤ 5.5V

2.5V ≤ Vcc < 4.5V

1.8V ≤ Vcc < 2.5V

20

21

TWC

—

Internal write cycle time

Endurance

—

5

ms

(NOTE 3)

1M

—

E/W (NOTE 2)

Cycles

Note 1: This parameter is periodically sampled and not 100% tested.

2: This parameter is not tested but ensured by characterization. For endurance estimates in a specific

application, please consult the Total Endurance™ Model which can be obtained from Microchip’s web site

at www.microchip.com.

3: TWC begins on the rising edge of CS after a valid write sequence and ends when the internal write cycle

is complete.

TABLE 1-3:

AC Waveform:

VLO = 0.2V

AC TEST CONDITIONS

—

VHI = VCC - 0.2V

(Note 1)

(Note 2)

—

VHI = 4.0V

CL = 100 pF

Timing Measurement Reference Level

Input

0.5 VCC

Output

Note 1: For VCC ≤ 4.0V

2: For VCC > 4.0V

DS21830D-page 4

25AA640A/25LC640A

FIGURE 1-1: HOLD TIMING

CS

17

16

SCK

18

19

High-Impedance

n

SO

n + 2

n + 1

n

n-1

5

Don’t Care

n

n + 1

n

n - 1

SI

HOLD

FIGURE 1-2: SERIAL INPUT TIMING

4

CS

12

11

2

7

3

8

Mode 1,1

Mode 0,0

SCK

SI

5

6

MSB in

LSB in

High-Impedance

SO

FIGURE 1-3: SERIAL OUTPUT TIMING

CS

3

9

10

Mode 1,1

Mode 0,0

SCK

13

15

ISB out

14

MSB out

SO

SI

Don’t Care

DS21830D-page 5

25AA640A/25LC640A

2.0

2.1

FUNCTIONAL DESCRIPTION

Principles of Operation

2.3

Write Sequence

The 25XX640A is a 8192-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 PIC^®

microcontrollers. It may also interface with microcon-

trollers that do not have a built-in SPI port by using dis-

crete I/O lines programmed properly in firmware to

match the SPI protocol.

Prior to any attempt to write data to the 25XX640A, the

write enable latch must be set by issuing the WREN

instruction (Figure 2-4). This is done by setting CS low

and then clocking out the proper instruction into the

25XX640A. 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.

The 25XX640A contains an 8-bit instruction register.

The device 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.

Once the write enable latch is set, the user may

proceed by setting the CS low, issuing a WRITEinstruc-

tion, followed by the 16-bit address, with the three

MSBs of the address being “don’t care” bits, and then

the data to be written. Up to 32 bytes of data can be

sent to the device before a write cycle is necessary.

The only restriction is that all of the bytes must reside

in the same page.

Table 2-1 contains a list of the possible instruction

bytes and format for device operation. All instructions,

addresses and data are transferred Most Significant

Byte (MSB) first, Least Significant Byte (LSB) last.

Data (SI) is sampled on the first rising edge of SCK

after CS goes low. If the clock line is shared with other

peripheral devices on the SPI bus, the user can assert

the HOLD input and place the 25XX640A in ‘HOLD’

mode. After releasing the HOLD pin, operation will

resume from the point when the HOLD was asserted.

Note:

Page write operations are limited to writing

bytes within a single physical page,

regardless of the number of bytes

actually being written. Physical page

boundaries start at addresses that are

integer multiples of the page buffer size (or

‘page size’) and, end at addresses that are

integer multiples of page size – 1. If a

Page Write command attempts to write

across a physical page boundary, the

result is that the data wraps around to the

beginning of the current page (overwriting

data previously stored there), instead of

being written to the next page as might be

expected. It is therefore necessary for the

application software to prevent page write

operations that would attempt to cross a

page boundary.

2.2

Read Sequence

The device is selected by pulling CS low. The 8-bit

READ instruction is transmitted to the 25XX640A fol-

lowed by the 16-bit address, with the three MSBs of the

address being “don’t care” bits. 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 pro-

vide clock pulses. The internal Address Pointer is auto-

matically incremented to the next higher address after

each byte of data is shifted out. When the highest

address is reached (1FFFh), 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 2-1).

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^thdata byte has been clocked in. If CS is

brought high at any other time, the write operation will

not be completed. Refer to Figure 2-2 and Figure 2-3

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 WPEN, WIP, WEL,

BP1 and BP0 bits (Figure 2-6). 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.

DS21830D-page 6

25AA640A/25LC640A

BLOCK DIAGRAM

STATUS

Register

HV Generator

EEPROM

Array

Memory

Control

Logic

X

I/O Control

Logic

Dec

Page Latches

Y Decoder

SI

SO

CS

SCK

Sense Amp.

R/W Control

HOLD

WP

VCC

VSS

TABLE 2-1:

INSTRUCTION SET

Instruction Name

READ

Instruction Format

Description

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

0000 0011

0000 0010

0000 0100

0000 0110

0000 0101

0000 0001

WRITE

WRDI

WREN

RDSR

WRSR

Write STATUS register

FIGURE 2-1: READ SEQUENCE

CS

0

1

2

3

4

5

6

7

8

9 10 11

21 22 23 24 25 26 27 28 29 30 31

SCK

SI

Instruction

16-bit Address

1 15 14 13 12

0

1

2

1

0

Data Out

High-Impedance

7

6

5

4

3

2

1

0

SO

DS21830D-page 7

25AA640A/25LC640A

FIGURE 2-2: BYTE WRITE SEQUENCE

CS

Twc

0

1

2

3

4

5

6

7

8

9 10 11

21 22 23 24 25 26 27 28 29 30 31

Data Byte

SCK

SI

Instruction

16-bit Address

15 14 13 12

0

1

0

2

1

0

7

6

5

4

3

2

1

0

High-Impedance

SO

FIGURE 2-3: PAGE WRITE SEQUENCE

CS

0

1

2

3

4

5

6

7

8

9

10 11

21 22 23 24 25 26 27 28 29 30 31

Data Byte 1

SCK

SI

Instruction

16-bit Address

0

1

0 15 14 13 12

2

1

0

7

6

5

4

3

2

1

0

CS

32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47

SCK

SI

Data Byte 2

Data Byte 3

Data Byte n (32 max.)

7

6

5

4

3

2

1

0

7

6

5

4

3

2

1

0

7

6

5

4

3

2

1

0

DS21830D-page 8

25AA640A/25LC640A

The following is a list of conditions under which the

write enable latch will be reset:

2.4

Write Enable (WREN) and Write

Disable (WRDI)

• Power-up

The 25XX640A contains a write enable latch. See

Table 2-4 for the Write-Protect Functionality Matrix.

This latch must be set before any write operation will be

completed internally. The WRENinstruction will set the

latch and the WRDIwill reset the latch.

• WRDIinstruction successfully executed

• WRSRinstruction successfully executed

• WRITEinstruction successfully executed

FIGURE 2-4: WRITE ENABLE SEQUENCE (WREN)

CS

0

1

2

3

4

5

6

7

SCK

SI

0

1

0

High-Impedance

SO

FIGURE 2-5: WRITE DISABLE SEQUENCE (WRDI)

CS

0

1

2

3

4

5

6

7

SCK

0

1

0

SI

High-Impedance

SO

DS21830D-page 9

25AA640A/25LC640A

The Write Enable Latch (WEL) bit indicates the status

of the write enable latch and is read-only. When set to

a ‘1’, the latch allows writes to the array, when set to a

‘0’, the latch prohibits writes to the array. The state of

this bit can always be updated via the WREN or WRDI

commands regardless of the state of write protection

on the STATUS register. These commands are shown

in Figure 2-4 and Figure 2-5.

2.5

Read Status Register Instruction

(RDSR)

The Read Status Register instruction (RDSR) provides

access to the STATUS register. The STATUS register

may be read at any time, even during a write cycle. The

STATUS register is formatted as follows:

TABLE 2-2:

STATUS REGISTER

The Block Protection (BP0 and BP1) bits indicate

which blocks are currently write-protected. These bits

are set by the user issuing the WRSRinstruction. These

bits are nonvolatile, and are shown in Table 2-3.

7

6

–

X

5

–

X

4

–

X

3

2

1

0

W/R

W/R W/R

R

WPEN

BP1 BP0 WEL WIP

See Figure 2-6 for the RDSRtiming sequence.

W/R = writable/readable. R = read-only.

The Write-In-Process (WIP) bit indicates whether the

25XX640A is busy with a write operation. When set to

a ‘1’, a write is in progress, when set to a ‘0’, no write

is in progress. This bit is read-only.

FIGURE 2-6: READ STATUS REGISTER TIMING SEQUENCE (RDSR)

CS

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

SCK

Instruction

0

1

0

1

SI

Data from STATUS Register

High-Impedance

7

6

5

4

3

2

1

0

SO

DS21830D-page 10

25AA640A/25LC640A

See Figure 2-7 for the WRSRtiming sequence.

2.6

Write Status Register Instruction

(WRSR)

TABLE 2-3:

BP1

ARRAY PROTECTION

The Write Status Register instruction (WRSR) allows the

user to write to the nonvolatile bits in the STATUS reg-

ister as shown in Table 2-2. The user is able to select

one of four levels of protection for the array by writing

to the appropriate bits in the STATUS register. The

array is divided up into four segments. The user has the

ability to write-protect none, one, two, or all four of the

segments of the array. The partitioning is controlled as

shown in Table 2-3.

Array Addresses

Write-Protected

BP0

none

0

1

upper 1/4

(1800h-1FFFh)

upper 1/2

(1000h-1FFFh)

1

0

1

The Write-Protect Enable (WPEN) bit is a nonvolatile

bit that is available as an enable bit for the WP pin. The

Write-Protect (WP) pin and the Write-Protect Enable

(WPEN) bit in the STATUS register control the

programmable hardware write-protect feature. Hard-

ware write protection is enabled when WP pin is low

and the WPEN bit is high. Hardware write protection is

disabled when either the WP pin is high or the WPEN

bit is low. When the chip is hardware write-protected,

only writes to nonvolatile bits in the STATUS register

are disabled. See Table 2-4 for a matrix of functionality

on the WPEN bit.

all

(0000h-1FFFh)

FIGURE 2-7: WRITE STATUS REGISTER TIMING SEQUENCE (WRSR)

CS

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

1

15

0

SCK

Instruction

Data to STATUS Register

7

6

5

4

3

2

0

1

SI

High-Impedance

SO

Note:

An internal write cycle (TWC) is initiated on the rising edge of CS after a valid write STATUS register

sequence.

DS21830D-page 11

25AA640A/25LC640A

2.7

Data Protection

2.8

Power-On State

The following protection has been implemented to

prevent inadvertent writes to the array:

The 25XX640A powers on in the following state:

• The device is in low-power Standby mode

(CS= 1)

• The write enable latch is reset

• SO is in high-impedance state

• A high-to-low-level transition on CS is required to

enter active state

• The write enable latch is reset on power-up

• A write enable instruction must be issued to set

the write enable latch

• After a byte write, page write or STATUS register

write, the write enable latch is reset

• CS must be set high after the proper number of

clock cycles to start an internal write cycle

• Access to the array during an internal write cycle

is ignored and programming is continued

TABLE 2-4:

WRITE-PROTECT FUNCTIONALITY MATRIX

WEL

(SR bit 1)

WPEN

(SR bit 7)

WP

(pin 3)

Protected Blocks

Unprotected Blocks

STATUS Register

0

x

0

1

x

Protected

Writable

Protected

Writable

Protected

Writable

1

x

1

0 (low)

1 (high)

1

x = don’t care

DS21830D-page 12

25AA640A/25LC640A

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

The WP pin function is blocked when the WPEN bit in

the STATUS register is low. This allows the user to

install the 25XX640A in a system with WP pin

grounded and still be able to write to the STATUS reg-

ister. The WP pin functions will be enabled when the

WPEN bit is set high.

TABLE 3-1:

PIN FUNCTION TABLE

X-Rotated

Name

Function

Number Pin Number

3.4

Serial Input (SI)

CS

SO

1

2

3

4

5

6

7

8

3

4

5

6

7

8

1

2

Chip Select Input

Serial Data Output

Write-Protect Pin

Ground

The SI pin is used to transfer data into the device. It

receives instructions, addresses and data. Data is

latched on the rising edge of the serial clock.

WP

VSS

SI

3.5

Serial Clock (SCK)

Serial Data Input

Serial Clock Input

Hold Input

The SCK is used to synchronize the communication

between a master and the 25XX640A. Instructions,

addresses or data present on the SI pin are latched on

the rising edge of the clock input, while data on the SO

pin is updated after the falling edge of the clock input.

SCK

HOLD

VCC

Supply Voltage

3.1

Chip Select (CS)

3.6

Hold (HOLD)

A low level on this pin selects the device. A high level

deselects the device and forces it into Standby mode.

However, a programming cycle which is already

initiated or in progress will be completed, regardless of

the CS input signal. If CS is brought high during a

program cycle, the device will go into Standby mode as

soon as the programming cycle is complete. When the

device is deselected, SO goes to the high-impedance

state, allowing multiple parts to share the same SPI

bus. A low-to-high transition on CS after a valid write

sequence initiates an internal write cycle. After power-

up, a low level on CS is required prior to any sequence

being initiated.

The HOLD pin is used to suspend transmission to the

25XX640A while in the middle of a serial sequence

without having to retransmit the entire sequence again.

It must be held high any time this function is not being

used. Once the device is selected and a serial

sequence is underway, the HOLD pin may be pulled

low to pause further serial communication without

resetting the serial sequence. The HOLD pin must be

brought low while SCK is low, otherwise the HOLD

function will not be invoked until the next SCK high-to-

low transition. The 25XX640A must remain selected

during this sequence. The SI, SCK and SO pins are in

a high-impedance state during the time the device is

paused and transitions on these pins will be ignored. To

resume serial communication, HOLD must be brought

high while the SCK pin is low, otherwise serial

communication will not resume. Lowering the HOLD

line at any time will tri-state the SO line.

3.2

Serial Output (SO)

The SO pin is used to transfer data out of the

25XX640A. During a read cycle, data is shifted out on

this pin after the falling edge of the serial clock.

3.3

Write-Protect (WP)

This pin is used in conjunction with the WPEN bit in the

STATUS register to prohibit writes to the nonvolatile

bits in the STATUS register. When WP is low and

WPEN is high, writing to the nonvolatile bits in the STA-

TUS register is disabled. All other operations function

normally. When WP is high, all functions, including

writes to the nonvolatile bits in the STATUS register

operate normally. If the WPEN bit is set, WP low during

a STATUS register write sequence will disable writing

to the STATUS register. If an internal write cycle has

already begun, WP going low will have no effect on the

write.

DS21830D-page 13

25AA640A/25LC640A

4.0

4.1

PACKAGING INFORMATION

Package Marking Information

8-Lead DFN-S (5x6x1 mm)

Example:

XXXXXXX

XXYYWW

5LC640A

E/MF

0728

e

3

NNN

IL7

8-Lead MSOP (150 mil)

Example:

MSOP 1st Line Marking Codes

5LCAI

7281L7

Device

std mark

XXXXXT

YWWNNN

25AA640A

25LC640A

5ACA

5LCA

Example:

25LC640A

8-Lead PDIP

XXXXXXXX

T/XXXNNN

I/P

1L7

e

3

0728

YYWW

Example:

25L640AI

8-Lead SOIC

XXXXXXXT

SN

0728

XX/XXYYWW

e

3

1L7

NNN

Example:

8-Lead TSSOP

TSSOP 1st Line Marking Codes

5LCA

I728

1L7

XXXX

TYWW

NNN

Device

std mark

25AA640A

25AA640AX

25LC640A

25LC640AX

5ACA

ACAX

5LCA

LCAX

8-Lead 2x3 TDFN

Example:

TDFN 1st Line Marking

std mark

Device

XXX

YWW

NN

C81

828

17

25AA640A-I

25LC640A-E

25LC640A-I

C81

C85

C84

DS21830D-page 14

25AA640A/25LC640A

Legend: XX...X Customer-specific information

Y

Year code (last digit of calendar year)

YY

Year code (last 2 digits of calendar year)

WW

NNN

Week code (week of January 1 is week ‘01’)

Alphanumeric traceability code

Pb-free JEDEC designator for Matte Tin (Sn)

This package is Pb-free. The Pb-free JEDEC designator (

can be found on the outer packaging for this package.

e

3

e

3

*

)

Note: In the event the full Microchip part number cannot be marked on one line, it will

be carried over to the next line, thus limiting the number of available

characters for customer-specific information.

Note: Custom marking available.

DS21830D-page 15

25AA640A/25LC640A

ꢀꢁꢂꢃꢄꢅꢆꢇꢈꢄꢉꢊꢋꢌꢆꢍꢎꢄꢈꢆꢏꢈꢄꢊꢐꢆꢑꢒꢆꢂꢃꢄꢅꢆꢇꢄꢌꢓꢄꢔꢃꢆꢕꢖꢏꢗꢆMꢆꢘꢙꢚꢆꢛꢛꢆꢜꢒꢅ ꢆ!ꢍꢏꢑꢁ"#ꢆ

ꢇ$ꢑ%& "'ꢑ($ꢂ)*+ꢍ

ꢑꢒꢊꢃ, 2ꢋꢉꢅ&ꢍꢈꢅ'ꢋ!&ꢅꢌ"ꢉꢉꢈꢄ&ꢅꢐꢆꢌ+ꢆꢏꢈꢅ#ꢉꢆ*ꢃꢄꢏ!(ꢅꢐꢇꢈꢆ!ꢈꢅ!ꢈꢈꢅ&ꢍꢈꢅꢕꢃꢌꢉꢋꢌꢍꢃꢐꢅꢂꢆꢌ+ꢆꢏꢃꢄꢏꢅꢔꢐꢈꢌꢃ%ꢃꢌꢆ&ꢃꢋꢄꢅꢇꢋꢌꢆ&ꢈ#ꢅꢆ&ꢅ

ꢍ&&ꢐ133***ꢁ'ꢃꢌꢉꢋꢌꢍꢃꢐꢁꢌꢋ'3ꢐꢆꢌ+ꢆꢏꢃꢄꢏ

D

e

L

D1

b

N

K

E

E2

E1

EXPOSED

PAD

NOTE 1

1

2

1

NOTE 1

D2

TOP VIEW

BOTTOM VIEW

φ

A2

A

A3

A1

NOTE 2

4ꢄꢃ&!

ꢒꢃ'ꢈꢄ!ꢃꢋꢄꢅ5ꢃ'ꢃ&!

ꢕꢙ55ꢙꢕ,ꢗ,ꢘꢔ

67ꢕ

ꢕꢙ6

ꢕꢓ8

6"')ꢈꢉꢅꢋ%ꢅꢂꢃꢄ!

ꢂꢃ&ꢌꢍ

7 ꢈꢉꢆꢇꢇꢅ:ꢈꢃꢏꢍ&

ꢕꢋꢇ#ꢈ#ꢅꢂꢆꢌ+ꢆꢏꢈꢅꢗꢍꢃꢌ+ꢄꢈ!!

ꢔ&ꢆꢄ#ꢋ%%ꢅ

/ꢆ!ꢈꢅꢗꢍꢃꢌ+ꢄꢈ!!

6

ꢈ

ꢓ

ꢓꢎ

ꢓꢀ

ꢓꢑ

ꢒ

ꢒꢀ

ꢒꢎ

,

,ꢀ

,ꢎ

)

5

>

9

ꢀꢁꢎꢚꢅ/ꢔ0

ꢛꢁ9.

ꢛꢁ<.

M

ꢛꢁꢛꢛ

ꢀꢁꢛꢛ

ꢛꢁ9ꢛ

ꢛꢁꢛ.

ꢛꢁꢛꢀ

ꢛꢁꢎꢛꢅꢘ,2

ꢖꢁꢜꢎꢅ/ꢔ0

ꢖꢁ<ꢚꢅ/ꢔ0

ꢖꢁꢛꢛ

.ꢁꢜꢜꢅ/ꢔ0

.ꢁꢚꢖꢅ/ꢔ0

ꢎꢁꢑꢀ

ꢛꢁꢖꢛ

ꢛꢁ<ꢛ

M

7 ꢈꢉꢆꢇꢇꢅ5ꢈꢄꢏ&ꢍ

ꢕꢋꢇ#ꢈ#ꢅꢂꢆꢌ+ꢆꢏꢈꢅ5ꢈꢄꢏ&ꢍ

,$ꢐꢋ!ꢈ#ꢅꢂꢆ#ꢅ5ꢈꢄꢏ&ꢍ

7 ꢈꢉꢆꢇꢇꢅ=ꢃ#&ꢍ

ꢕꢋꢇ#ꢈ#ꢅꢂꢆꢌ+ꢆꢏꢈꢅ=ꢃ#&ꢍ

,$ꢐꢋ!ꢈ#ꢅꢂꢆ#ꢅ=ꢃ#&ꢍ

0ꢋꢄ&ꢆꢌ&ꢅ=ꢃ#&ꢍ

0ꢋꢄ&ꢆꢌ&ꢅ5ꢈꢄꢏ&ꢍ

0ꢋꢄ&ꢆꢌ&ꢝ&ꢋꢝ,$ꢐꢋ!ꢈ#ꢅꢂꢆ#

ꢕꢋ#ꢈꢇꢅꢒꢉꢆ%&ꢅꢓꢄꢏꢇꢈꢅꢗꢋꢐ

ꢑꢁ9.

ꢖꢁꢀ.

ꢎꢁꢀ<

ꢛꢁꢑ.

ꢛꢁ.ꢛ

ꢛꢁꢎꢛ

M

ꢎꢁꢖ<

ꢛꢁꢖꢚ

ꢛꢁꢚ.

M

ꢀ

ꢀꢎꢞ

ꢑꢒꢊꢃꢉ,

ꢀꢁ ꢂꢃꢄꢅꢀꢅ ꢃ!"ꢆꢇꢅꢃꢄ#ꢈ$ꢅ%ꢈꢆ&"ꢉꢈꢅ'ꢆꢊꢅ ꢆꢉꢊ(ꢅ)"&ꢅ'"!&ꢅ)ꢈꢅꢇꢋꢌꢆ&ꢈ#ꢅ*ꢃ&ꢍꢃꢄꢅ&ꢍꢈꢅꢍꢆ&ꢌꢍꢈ#ꢅꢆꢉꢈꢆꢁ

ꢎꢁ ꢂꢆꢌ+ꢆꢏꢈꢅ'ꢆꢊꢅꢍꢆ ꢈꢅꢋꢄꢈꢅꢋꢉꢅ'ꢋꢉꢈꢅꢈ$ꢐꢋ!ꢈ#ꢅ&ꢃꢈꢅ)ꢆꢉ!ꢅꢆ&ꢅꢈꢄ#!ꢁ

ꢑꢁ ꢒꢃ'ꢈꢄ!ꢃꢋꢄꢃꢄꢏꢅꢆꢄ#ꢅ&ꢋꢇꢈꢉꢆꢄꢌꢃꢄꢏꢅꢐꢈꢉꢅꢓꢔꢕ,ꢅ-ꢀꢖꢁ.ꢕꢁ

/ꢔ01 /ꢆ!ꢃꢌꢅꢒꢃ'ꢈꢄ!ꢃꢋꢄꢁꢅꢗꢍꢈꢋꢉꢈ&ꢃꢌꢆꢇꢇꢊꢅꢈ$ꢆꢌ&ꢅ ꢆꢇ"ꢈꢅ!ꢍꢋ*ꢄꢅ*ꢃ&ꢍꢋ"&ꢅ&ꢋꢇꢈꢉꢆꢄꢌꢈ!ꢁ

ꢘ,21 ꢘꢈ%ꢈꢉꢈꢄꢌꢈꢅꢒꢃ'ꢈꢄ!ꢃꢋꢄ(ꢅ"!"ꢆꢇꢇꢊꢅ*ꢃ&ꢍꢋ"&ꢅ&ꢋꢇꢈꢉꢆꢄꢌꢈ(ꢅ%ꢋꢉꢅꢃꢄ%ꢋꢉ'ꢆ&ꢃꢋꢄꢅꢐ"ꢉꢐꢋ!ꢈ!ꢅꢋꢄꢇꢊꢁ

ꢕꢃꢌꢉꢋꢌꢍꢃꢐ ꢗꢈꢌꢍꢄꢋꢇꢋꢏꢊ ꢒꢉꢆ*ꢃꢄꢏ 0ꢛꢖꢝꢀꢀꢑ/

DS21830D-page 16

25AA640A/25LC640A

ꢀꢁꢂꢃꢄꢅꢆꢇꢈꢄꢉꢊꢋꢌꢆꢖꢋꢌ-ꢒꢆ"ꢛꢄꢈꢈꢆ.ꢎꢊꢈꢋ/ꢃꢆꢇꢄꢌꢓꢄꢔꢃꢆꢕꢖ"ꢗꢆ!ꢖ".ꢇ#

ꢑꢒꢊꢃ, 2ꢋꢉꢅ&ꢍꢈꢅ'ꢋ!&ꢅꢌ"ꢉꢉꢈꢄ&ꢅꢐꢆꢌ+ꢆꢏꢈꢅ#ꢉꢆ*ꢃꢄꢏ!(ꢅꢐꢇꢈꢆ!ꢈꢅ!ꢈꢈꢅ&ꢍꢈꢅꢕꢃꢌꢉꢋꢌꢍꢃꢐꢅꢂꢆꢌ+ꢆꢏꢃꢄꢏꢅꢔꢐꢈꢌꢃ%ꢃꢌꢆ&ꢃꢋꢄꢅꢇꢋꢌꢆ&ꢈ#ꢅꢆ&ꢅ

ꢍ&&ꢐ133***ꢁ'ꢃꢌꢉꢋꢌꢍꢃꢐꢁꢌꢋ'3ꢐꢆꢌ+ꢆꢏꢃꢄꢏ

D

N

E

E1

NOTE 1

2

b

1

e

c

φ

A2

A

L

L1

A1

4ꢄꢃ&!

ꢕꢙ55ꢙꢕ,ꢗ,ꢘꢔ

ꢒꢃ'ꢈꢄ!ꢃꢋꢄꢅ5ꢃ'ꢃ&!

ꢕꢙ6

67ꢕ

ꢕꢓ8

6"')ꢈꢉꢅꢋ%ꢅꢂꢃꢄ!

ꢂꢃ&ꢌꢍ

6

ꢈ

9

ꢛꢁ<.ꢅ/ꢔ0

7 ꢈꢉꢆꢇꢇꢅ:ꢈꢃꢏꢍ&

ꢕꢋꢇ#ꢈ#ꢅꢂꢆꢌ+ꢆꢏꢈꢅꢗꢍꢃꢌ+ꢄꢈ!!

ꢔ&ꢆꢄ#ꢋ%%ꢅ

7 ꢈꢉꢆꢇꢇꢅ=ꢃ#&ꢍ

ꢕꢋꢇ#ꢈ#ꢅꢂꢆꢌ+ꢆꢏꢈꢅ=ꢃ#&ꢍ

7 ꢈꢉꢆꢇꢇꢅ5ꢈꢄꢏ&ꢍ

2ꢋꢋ&ꢅ5ꢈꢄꢏ&ꢍ

ꢓ

M

ꢛꢁꢚ.

ꢛꢁꢛꢛ

M

ꢛꢁ9.

ꢀꢁꢀꢛ

ꢛꢁꢜ.

ꢛꢁꢀ.

ꢓꢎ

ꢓꢀ

,

,ꢀ

ꢒ

M

ꢖꢁꢜꢛꢅ/ꢔ0

ꢑꢁꢛꢛꢅ/ꢔ0

ꢛꢁ<ꢛ

5

ꢛꢁꢖꢛ

ꢛꢁ9ꢛ

2ꢋꢋ&ꢐꢉꢃꢄ&

2ꢋꢋ&ꢅꢓꢄꢏꢇꢈ

5ꢀ

ꢀ

ꢛꢁꢜ.ꢅꢘ,2

M

ꢛꢞ

9ꢞ

5ꢈꢆ#ꢅꢗꢍꢃꢌ+ꢄꢈ!!

5ꢈꢆ#ꢅ=ꢃ#&ꢍ

ꢌ

)

ꢛꢁꢛ9

ꢛꢁꢎꢎ

M

ꢛꢁꢎꢑ

ꢛꢁꢖꢛ

ꢑꢒꢊꢃꢉ,

ꢀꢁ ꢂꢃꢄꢅꢀꢅ ꢃ!"ꢆꢇꢅꢃꢄ#ꢈ$ꢅ%ꢈꢆ&"ꢉꢈꢅ'ꢆꢊꢅ ꢆꢉꢊ(ꢅ)"&ꢅ'"!&ꢅ)ꢈꢅꢇꢋꢌꢆ&ꢈ#ꢅ*ꢃ&ꢍꢃꢄꢅ&ꢍꢈꢅꢍꢆ&ꢌꢍꢈ#ꢅꢆꢉꢈꢆꢁ

ꢎꢁ ꢒꢃ'ꢈꢄ!ꢃꢋꢄ!ꢅꢒꢅꢆꢄ#ꢅ,ꢀꢅ#ꢋꢅꢄꢋ&ꢅꢃꢄꢌꢇ"#ꢈꢅ'ꢋꢇ#ꢅ%ꢇꢆ!ꢍꢅꢋꢉꢅꢐꢉꢋ&ꢉ"!ꢃꢋꢄ!ꢁꢅꢕꢋꢇ#ꢅ%ꢇꢆ!ꢍꢅꢋꢉꢅꢐꢉꢋ&ꢉ"!ꢃꢋꢄ!ꢅ!ꢍꢆꢇꢇꢅꢄꢋ&ꢅꢈ$ꢌꢈꢈ#ꢅꢛꢁꢀ.ꢅ''ꢅꢐꢈꢉꢅ!ꢃ#ꢈꢁ

ꢑꢁ ꢒꢃ'ꢈꢄ!ꢃꢋꢄꢃꢄꢏꢅꢆꢄ#ꢅ&ꢋꢇꢈꢉꢆꢄꢌꢃꢄꢏꢅꢐꢈꢉꢅꢓꢔꢕ,ꢅ-ꢀꢖꢁ.ꢕꢁ

/ꢔ01 /ꢆ!ꢃꢌꢅꢒꢃ'ꢈꢄ!ꢃꢋꢄꢁꢅꢗꢍꢈꢋꢉꢈ&ꢃꢌꢆꢇꢇꢊꢅꢈ$ꢆꢌ&ꢅ ꢆꢇ"ꢈꢅ!ꢍꢋ*ꢄꢅ*ꢃ&ꢍꢋ"&ꢅ&ꢋꢇꢈꢉꢆꢄꢌꢈ!ꢁ

ꢘ,21 ꢘꢈ%ꢈꢉꢈꢄꢌꢈꢅꢒꢃ'ꢈꢄ!ꢃꢋꢄ(ꢅ"!"ꢆꢇꢇꢊꢅ*ꢃ&ꢍꢋ"&ꢅ&ꢋꢇꢈꢉꢆꢄꢌꢈ(ꢅ%ꢋꢉꢅꢃꢄ%ꢋꢉ'ꢆ&ꢃꢋꢄꢅꢐ"ꢉꢐꢋ!ꢈ!ꢅꢋꢄꢇꢊꢁ

ꢕꢃꢌꢉꢋꢌꢍꢃꢐ ꢗꢈꢌꢍꢄꢋꢇꢋꢏꢊ ꢒꢉꢆ*ꢃꢄꢏ 0ꢛꢖꢝꢀꢀꢀ/

DS21830D-page 17

25AA640A/25LC640A

ꢀꢁꢂꢃꢄꢅꢆꢇꢈꢄꢉꢊꢋꢌꢆꢍꢎꢄꢈꢆ'/ꢁꢂꢋ/ꢃꢆꢕꢇꢗꢆMꢆ011ꢆꢛꢋꢈꢆꢜꢒꢅ ꢆ!ꢇꢍ'ꢇ#

ꢑꢒꢊꢃ, 2ꢋꢉꢅ&ꢍꢈꢅ'ꢋ!&ꢅꢌ"ꢉꢉꢈꢄ&ꢅꢐꢆꢌ+ꢆꢏꢈꢅ#ꢉꢆ*ꢃꢄꢏ!(ꢅꢐꢇꢈꢆ!ꢈꢅ!ꢈꢈꢅ&ꢍꢈꢅꢕꢃꢌꢉꢋꢌꢍꢃꢐꢅꢂꢆꢌ+ꢆꢏꢃꢄꢏꢅꢔꢐꢈꢌꢃ%ꢃꢌꢆ&ꢃꢋꢄꢅꢇꢋꢌꢆ&ꢈ#ꢅꢆ&ꢅ

ꢍ&&ꢐ133***ꢁ'ꢃꢌꢉꢋꢌꢍꢃꢐꢁꢌꢋ'3ꢐꢆꢌ+ꢆꢏꢃꢄꢏ

N

NOTE 1

E1

3

1

2

D

E

A2

A

L

A1

c

e

eB

b1

b

4ꢄꢃ&!

ꢙ60:,ꢔ

ꢒꢃ'ꢈꢄ!ꢃꢋꢄꢅ5ꢃ'ꢃ&!

ꢕꢙ6

67ꢕ

9

ꢁꢀꢛꢛꢅ/ꢔ0

M

ꢁꢀꢑꢛ

M

ꢁꢑꢀꢛ

ꢁꢎ.ꢛ

ꢁꢑ<.

ꢁꢀꢑꢛ

ꢁꢛꢀꢛ

ꢁꢛ<ꢛ

ꢁꢛꢀ9

M

ꢕꢓ8

6"')ꢈꢉꢅꢋ%ꢅꢂꢃꢄ!

ꢂꢃ&ꢌꢍ

ꢗꢋꢐꢅ&ꢋꢅꢔꢈꢆ&ꢃꢄꢏꢅꢂꢇꢆꢄꢈ

ꢕꢋꢇ#ꢈ#ꢅꢂꢆꢌ+ꢆꢏꢈꢅꢗꢍꢃꢌ+ꢄꢈ!!

/ꢆ!ꢈꢅ&ꢋꢅꢔꢈꢆ&ꢃꢄꢏꢅꢂꢇꢆꢄꢈ

ꢔꢍꢋ"ꢇ#ꢈꢉꢅ&ꢋꢅꢔꢍꢋ"ꢇ#ꢈꢉꢅ=ꢃ#&ꢍ

ꢕꢋꢇ#ꢈ#ꢅꢂꢆꢌ+ꢆꢏꢈꢅ=ꢃ#&ꢍ

7 ꢈꢉꢆꢇꢇꢅ5ꢈꢄꢏ&ꢍ

6

ꢈ

ꢓ

ꢓꢎ

ꢓꢀ

,

,ꢀ

ꢒ

5

ꢌ

)ꢀ

)

ꢈ/

M

ꢁꢎꢀꢛ

ꢁꢀꢜ.

M

ꢁꢀꢀ.

ꢁꢛꢀ.

ꢁꢎꢜꢛ

ꢁꢎꢖꢛ

ꢁꢑꢖ9

ꢁꢀꢀ.

ꢁꢛꢛ9

ꢁꢛꢖꢛ

ꢁꢛꢀꢖ

M

ꢁꢑꢎ.

ꢁꢎ9ꢛ

ꢁꢖꢛꢛ

ꢁꢀ.ꢛ

ꢁꢛꢀ.

ꢁꢛꢚꢛ

ꢁꢛꢎꢎ

ꢁꢖꢑꢛ

ꢗꢃꢐꢅ&ꢋꢅꢔꢈꢆ&ꢃꢄꢏꢅꢂꢇꢆꢄꢈ

5ꢈꢆ#ꢅꢗꢍꢃꢌ+ꢄꢈ!!

4ꢐꢐꢈꢉꢅ5ꢈꢆ#ꢅ=ꢃ#&ꢍ

5ꢋ*ꢈꢉꢅ5ꢈꢆ#ꢅ=ꢃ#&ꢍ

7 ꢈꢉꢆꢇꢇꢅꢘꢋ*ꢅꢔꢐꢆꢌꢃꢄꢏꢅꢅꢟ

ꢑꢒꢊꢃꢉ,

ꢀꢁ ꢂꢃꢄꢅꢀꢅ ꢃ!"ꢆꢇꢅꢃꢄ#ꢈ$ꢅ%ꢈꢆ&"ꢉꢈꢅ'ꢆꢊꢅ ꢆꢉꢊ(ꢅ)"&ꢅ'"!&ꢅ)ꢈꢅꢇꢋꢌꢆ&ꢈ#ꢅ*ꢃ&ꢍꢅ&ꢍꢈꢅꢍꢆ&ꢌꢍꢈ#ꢅꢆꢉꢈꢆꢁ

ꢎꢁ ꢟꢅꢔꢃꢏꢄꢃ%ꢃꢌꢆꢄ&ꢅ0ꢍꢆꢉꢆꢌ&ꢈꢉꢃ!&ꢃꢌꢁ

ꢑꢁ ꢒꢃ'ꢈꢄ!ꢃꢋꢄ!ꢅꢒꢅꢆꢄ#ꢅ,ꢀꢅ#ꢋꢅꢄꢋ&ꢅꢃꢄꢌꢇ"#ꢈꢅ'ꢋꢇ#ꢅ%ꢇꢆ!ꢍꢅꢋꢉꢅꢐꢉꢋ&ꢉ"!ꢃꢋꢄ!ꢁꢅꢕꢋꢇ#ꢅ%ꢇꢆ!ꢍꢅꢋꢉꢅꢐꢉꢋ&ꢉ"!ꢃꢋꢄ!ꢅ!ꢍꢆꢇꢇꢅꢄꢋ&ꢅꢈ$ꢌꢈꢈ#ꢅꢁꢛꢀꢛAꢅꢐꢈꢉꢅ!ꢃ#ꢈꢁ

ꢖꢁ ꢒꢃ'ꢈꢄ!ꢃꢋꢄꢃꢄꢏꢅꢆꢄ#ꢅ&ꢋꢇꢈꢉꢆꢄꢌꢃꢄꢏꢅꢐꢈꢉꢅꢓꢔꢕ,ꢅ-ꢀꢖꢁ.ꢕꢁ

/ꢔ01ꢅ/ꢆ!ꢃꢌꢅꢒꢃ'ꢈꢄ!ꢃꢋꢄꢁꢅꢗꢍꢈꢋꢉꢈ&ꢃꢌꢆꢇꢇꢊꢅꢈ$ꢆꢌ&ꢅ ꢆꢇ"ꢈꢅ!ꢍꢋ*ꢄꢅ*ꢃ&ꢍꢋ"&ꢅ&ꢋꢇꢈꢉꢆꢄꢌꢈ!ꢁ

ꢕꢃꢌꢉꢋꢌꢍꢃꢐ ꢗꢈꢌꢍꢄꢋꢇꢋꢏꢊ ꢒꢉꢆ*ꢃꢄꢏ 0ꢛꢖꢝꢛꢀ9/

DS21830D-page 18

25AA640A/25LC640A

ꢀꢁꢂꢃꢄꢅꢆꢇꢈꢄꢉꢊꢋꢌꢆ"ꢛꢄꢈꢈꢆ.ꢎꢊꢈꢋ/ꢃꢆꢕ"ꢑꢗꢆMꢆꢑꢄ--ꢒ2ꢐꢆ0341ꢆꢛꢛꢆꢜꢒꢅ ꢆ!".'%#

ꢑꢒꢊꢃ, 2ꢋꢉꢅ&ꢍꢈꢅ'ꢋ!&ꢅꢌ"ꢉꢉꢈꢄ&ꢅꢐꢆꢌ+ꢆꢏꢈꢅ#ꢉꢆ*ꢃꢄꢏ!(ꢅꢐꢇꢈꢆ!ꢈꢅ!ꢈꢈꢅ&ꢍꢈꢅꢕꢃꢌꢉꢋꢌꢍꢃꢐꢅꢂꢆꢌ+ꢆꢏꢃꢄꢏꢅꢔꢐꢈꢌꢃ%ꢃꢌꢆ&ꢃꢋꢄꢅꢇꢋꢌꢆ&ꢈ#ꢅꢆ&ꢅ

ꢍ&&ꢐ133***ꢁ'ꢃꢌꢉꢋꢌꢍꢃꢐꢁꢌꢋ'3ꢐꢆꢌ+ꢆꢏꢃꢄꢏ

D

e

N

E

E1

NOTE 1

1

2

3

α

h

b

h

c

φ

A2

A

L

A1

L1

β

4ꢄꢃ&!

ꢕꢙ55ꢙꢕ,ꢗ,ꢘꢔ

ꢒꢃ'ꢈꢄ!ꢃꢋꢄꢅ5ꢃ'ꢃ&!

ꢕꢙ6

67ꢕ

ꢕꢓ8

6"')ꢈꢉꢅꢋ%ꢅꢂꢃꢄ!

ꢂꢃ&ꢌꢍ

6

ꢈ

9

ꢀꢁꢎꢚꢅ/ꢔ0

7 ꢈꢉꢆꢇꢇꢅ:ꢈꢃꢏꢍ&

ꢕꢋꢇ#ꢈ#ꢅꢂꢆꢌ+ꢆꢏꢈꢅꢗꢍꢃꢌ+ꢄꢈ!!

ꢔ&ꢆꢄ#ꢋ%%ꢅꢅꢟ

ꢓ

M

ꢀꢁꢎ.

ꢛꢁꢀꢛ

M

ꢀꢁꢚ.

M

ꢛꢁꢎ.

ꢓꢎ

ꢓꢀ

,

7 ꢈꢉꢆꢇꢇꢅ=ꢃ#&ꢍ

<ꢁꢛꢛꢅ/ꢔ0

ꢕꢋꢇ#ꢈ#ꢅꢂꢆꢌ+ꢆꢏꢈꢅ=ꢃ#&ꢍ

7 ꢈꢉꢆꢇꢇꢅ5ꢈꢄꢏ&ꢍ

0ꢍꢆ'%ꢈꢉꢅBꢋꢐ&ꢃꢋꢄꢆꢇC

2ꢋꢋ&ꢅ5ꢈꢄꢏ&ꢍ

,ꢀ

ꢒ

ꢍ

ꢑꢁꢜꢛꢅ/ꢔ0

ꢖꢁꢜꢛꢅ/ꢔ0

ꢛꢁꢎ.

ꢛꢁꢖꢛ

M

ꢛꢁ.ꢛ

ꢀꢁꢎꢚ

5

2ꢋꢋ&ꢐꢉꢃꢄ&

2ꢋꢋ&ꢅꢓꢄꢏꢇꢈ

5ꢈꢆ#ꢅꢗꢍꢃꢌ+ꢄꢈ!!

5ꢈꢆ#ꢅ=ꢃ#&ꢍ

ꢕꢋꢇ#ꢅꢒꢉꢆ%&ꢅꢓꢄꢏꢇꢈꢅꢗꢋꢐ

ꢕꢋꢇ#ꢅꢒꢉꢆ%&ꢅꢓꢄꢏꢇꢈꢅ/ꢋ&&ꢋ'

5ꢀ

ꢀ

ꢀꢁꢛꢖꢅꢘ,2

ꢛꢞ

ꢛꢁꢀꢚ

ꢛꢁꢑꢀ

.ꢞ

M

9ꢞ

ꢌ

)

ꢁ

ꢛꢁꢎ.

ꢛꢁ.ꢀ

ꢀ.ꢞ

ꢂ

.ꢞ

ꢀ.ꢞ

ꢑꢒꢊꢃꢉ,

ꢀꢁ ꢂꢃꢄꢅꢀꢅ ꢃ!"ꢆꢇꢅꢃꢄ#ꢈ$ꢅ%ꢈꢆ&"ꢉꢈꢅ'ꢆꢊꢅ ꢆꢉꢊ(ꢅ)"&ꢅ'"!&ꢅ)ꢈꢅꢇꢋꢌꢆ&ꢈ#ꢅ*ꢃ&ꢍꢃꢄꢅ&ꢍꢈꢅꢍꢆ&ꢌꢍꢈ#ꢅꢆꢉꢈꢆꢁ

ꢎꢁ ꢟꢅꢔꢃꢏꢄꢃ%ꢃꢌꢆꢄ&ꢅ0ꢍꢆꢉꢆꢌ&ꢈꢉꢃ!&ꢃꢌꢁ

ꢑꢁ ꢒꢃ'ꢈꢄ!ꢃꢋꢄ!ꢅꢒꢅꢆꢄ#ꢅ,ꢀꢅ#ꢋꢅꢄꢋ&ꢅꢃꢄꢌꢇ"#ꢈꢅ'ꢋꢇ#ꢅ%ꢇꢆ!ꢍꢅꢋꢉꢅꢐꢉꢋ&ꢉ"!ꢃꢋꢄ!ꢁꢅꢕꢋꢇ#ꢅ%ꢇꢆ!ꢍꢅꢋꢉꢅꢐꢉꢋ&ꢉ"!ꢃꢋꢄ!ꢅ!ꢍꢆꢇꢇꢅꢄꢋ&ꢅꢈ$ꢌꢈꢈ#ꢅꢛꢁꢀ.ꢅ''ꢅꢐꢈꢉꢅ!ꢃ#ꢈꢁ

ꢖꢁ ꢒꢃ'ꢈꢄ!ꢃꢋꢄꢃꢄꢏꢅꢆꢄ#ꢅ&ꢋꢇꢈꢉꢆꢄꢌꢃꢄꢏꢅꢐꢈꢉꢅꢓꢔꢕ,ꢅ-ꢀꢖꢁ.ꢕꢁ

/ꢔ01 /ꢆ!ꢃꢌꢅꢒꢃ'ꢈꢄ!ꢃꢋꢄꢁꢅꢗꢍꢈꢋꢉꢈ&ꢃꢌꢆꢇꢇꢊꢅꢈ$ꢆꢌ&ꢅ ꢆꢇ"ꢈꢅ!ꢍꢋ*ꢄꢅ*ꢃ&ꢍꢋ"&ꢅ&ꢋꢇꢈꢉꢆꢄꢌꢈ!ꢁ

ꢘ,21 ꢘꢈ%ꢈꢉꢈꢄꢌꢈꢅꢒꢃ'ꢈꢄ!ꢃꢋꢄ(ꢅ"!"ꢆꢇꢇꢊꢅ*ꢃ&ꢍꢋ"&ꢅ&ꢋꢇꢈꢉꢆꢄꢌꢈ(ꢅ%ꢋꢉꢅꢃꢄ%ꢋꢉ'ꢆ&ꢃꢋꢄꢅꢐ"ꢉꢐꢋ!ꢈ!ꢅꢋꢄꢇꢊꢁ

ꢕꢃꢌꢉꢋꢌꢍꢃꢐ ꢗꢈꢌꢍꢄꢋꢇꢋꢏꢊ ꢒꢉꢆ*ꢃꢄꢏ 0ꢛꢖꢝꢛ.ꢚ/

DS21830D-page 19

25AA640A/25LC640A

ꢀꢁꢂꢃꢄꢅꢆꢇꢈꢄꢉꢊꢋꢌꢆ"ꢛꢄꢈꢈꢆ.ꢎꢊꢈꢋ/ꢃꢆꢕ"ꢑꢗꢆMꢆꢑꢄ--ꢒ2ꢐꢆ0341ꢆꢛꢛꢆꢜꢒꢅ ꢆ!".'%#

ꢑꢒꢊꢃ, 2ꢋꢉꢅ&ꢍꢈꢅ'ꢋ!&ꢅꢌ"ꢉꢉꢈꢄ&ꢅꢐꢆꢌ+ꢆꢏꢈꢅ#ꢉꢆ*ꢃꢄꢏ!(ꢅꢐꢇꢈꢆ!ꢈꢅ!ꢈꢈꢅ&ꢍꢈꢅꢕꢃꢌꢉꢋꢌꢍꢃꢐꢅꢂꢆꢌ+ꢆꢏꢃꢄꢏꢅꢔꢐꢈꢌꢃ%ꢃꢌꢆ&ꢃꢋꢄꢅꢇꢋꢌꢆ&ꢈ#ꢅꢆ&ꢅ

ꢍ&&ꢐ133***ꢁ'ꢃꢌꢉꢋꢌꢍꢃꢐꢁꢌꢋ'3ꢐꢆꢌ+ꢆꢏꢃꢄꢏ

DS21830D-page 20

25AA640A/25LC640A

ꢀꢁꢂꢃꢄꢅꢆꢇꢈꢄꢉꢊꢋꢌꢆ*5ꢋ/ꢆ"5-ꢋ/ꢓꢆ"ꢛꢄꢈꢈꢆ.ꢎꢊꢈꢋ/ꢃꢆꢕ"*ꢗꢆMꢆ636ꢆꢛꢛꢆꢜꢒꢅ ꢆ!*"".ꢇ#

ꢑꢒꢊꢃ, 2ꢋꢉꢅ&ꢍꢈꢅ'ꢋ!&ꢅꢌ"ꢉꢉꢈꢄ&ꢅꢐꢆꢌ+ꢆꢏꢈꢅ#ꢉꢆ*ꢃꢄꢏ!(ꢅꢐꢇꢈꢆ!ꢈꢅ!ꢈꢈꢅ&ꢍꢈꢅꢕꢃꢌꢉꢋꢌꢍꢃꢐꢅꢂꢆꢌ+ꢆꢏꢃꢄꢏꢅꢔꢐꢈꢌꢃ%ꢃꢌꢆ&ꢃꢋꢄꢅꢇꢋꢌꢆ&ꢈ#ꢅꢆ&ꢅ

ꢍ&&ꢐ133***ꢁ'ꢃꢌꢉꢋꢌꢍꢃꢐꢁꢌꢋ'3ꢐꢆꢌ+ꢆꢏꢃꢄꢏ

D

N

E

E1

NOTE 1

1

2

b

e

c

φ

A

A2

A1

L

L1

4ꢄꢃ&!

ꢕꢙ55ꢙꢕ,ꢗ,ꢘꢔ

ꢒꢃ'ꢈꢄ!ꢃꢋꢄꢅ5ꢃ'ꢃ&!

ꢕꢙ6

67ꢕ

ꢕꢓ8

6"')ꢈꢉꢅꢋ%ꢅꢂꢃꢄ!

ꢂꢃ&ꢌꢍ

6

ꢈ

9

ꢛꢁ<.ꢅ/ꢔ0

7 ꢈꢉꢆꢇꢇꢅ:ꢈꢃꢏꢍ&

ꢕꢋꢇ#ꢈ#ꢅꢂꢆꢌ+ꢆꢏꢈꢅꢗꢍꢃꢌ+ꢄꢈ!!

ꢔ&ꢆꢄ#ꢋ%%ꢅ

ꢓ

M

ꢛꢁ9ꢛ

ꢛꢁꢛ.

M

ꢀꢁꢛꢛ

M

ꢀꢁꢎꢛ

ꢀꢁꢛ.

ꢛꢁꢀ.

ꢓꢎ

ꢓꢀ

,

7 ꢈꢉꢆꢇꢇꢅ=ꢃ#&ꢍ

<ꢁꢖꢛꢅ/ꢔ0

ꢕꢋꢇ#ꢈ#ꢅꢂꢆꢌ+ꢆꢏꢈꢅ=ꢃ#&ꢍ

ꢕꢋꢇ#ꢈ#ꢅꢂꢆꢌ+ꢆꢏꢈꢅ5ꢈꢄꢏ&ꢍ

2ꢋꢋ&ꢅ5ꢈꢄꢏ&ꢍ

,ꢀ

ꢒ

5

ꢖꢁꢑꢛ

ꢎꢁꢜꢛ

ꢛꢁꢖ.

ꢖꢁꢖꢛ

ꢑꢁꢛꢛ

ꢛꢁ<ꢛ

ꢖꢁ.ꢛ

ꢑꢁꢀꢛ

ꢛꢁꢚ.

2ꢋꢋ&ꢐꢉꢃꢄ&

2ꢋꢋ&ꢅꢓꢄꢏꢇꢈ

5ꢈꢆ#ꢅꢗꢍꢃꢌ+ꢄꢈ!!

5ꢈꢆ#ꢅ=ꢃ#&ꢍ

5ꢀ

ꢀ

ꢀꢁꢛꢛꢅꢘ,2

ꢛꢞ

ꢛꢁꢛꢜ

ꢛꢁꢀꢜ

M

9ꢞ

ꢌ

)

ꢛꢁꢎꢛ

ꢛꢁꢑꢛ

ꢑꢒꢊꢃꢉ,

ꢀꢁ ꢂꢃꢄꢅꢀꢅ ꢃ!"ꢆꢇꢅꢃꢄ#ꢈ$ꢅ%ꢈꢆ&"ꢉꢈꢅ'ꢆꢊꢅ ꢆꢉꢊ(ꢅ)"&ꢅ'"!&ꢅ)ꢈꢅꢇꢋꢌꢆ&ꢈ#ꢅ*ꢃ&ꢍꢃꢄꢅ&ꢍꢈꢅꢍꢆ&ꢌꢍꢈ#ꢅꢆꢉꢈꢆꢁ

ꢎꢁ ꢒꢃ'ꢈꢄ!ꢃꢋꢄ!ꢅꢒꢅꢆꢄ#ꢅ,ꢀꢅ#ꢋꢅꢄꢋ&ꢅꢃꢄꢌꢇ"#ꢈꢅ'ꢋꢇ#ꢅ%ꢇꢆ!ꢍꢅꢋꢉꢅꢐꢉꢋ&ꢉ"!ꢃꢋꢄ!ꢁꢅꢕꢋꢇ#ꢅ%ꢇꢆ!ꢍꢅꢋꢉꢅꢐꢉꢋ&ꢉ"!ꢃꢋꢄ!ꢅ!ꢍꢆꢇꢇꢅꢄꢋ&ꢅꢈ$ꢌꢈꢈ#ꢅꢛꢁꢀ.ꢅ''ꢅꢐꢈꢉꢅ!ꢃ#ꢈꢁ

ꢑꢁ ꢒꢃ'ꢈꢄ!ꢃꢋꢄꢃꢄꢏꢅꢆꢄ#ꢅ&ꢋꢇꢈꢉꢆꢄꢌꢃꢄꢏꢅꢐꢈꢉꢅꢓꢔꢕ,ꢅ-ꢀꢖꢁ.ꢕꢁ

/ꢔ01 /ꢆ!ꢃꢌꢅꢒꢃ'ꢈꢄ!ꢃꢋꢄꢁꢅꢗꢍꢈꢋꢉꢈ&ꢃꢌꢆꢇꢇꢊꢅꢈ$ꢆꢌ&ꢅ ꢆꢇ"ꢈꢅ!ꢍꢋ*ꢄꢅ*ꢃ&ꢍꢋ"&ꢅ&ꢋꢇꢈꢉꢆꢄꢌꢈ!ꢁ

ꢘ,21 ꢘꢈ%ꢈꢉꢈꢄꢌꢈꢅꢒꢃ'ꢈꢄ!ꢃꢋꢄ(ꢅ"!"ꢆꢇꢇꢊꢅ*ꢃ&ꢍꢋ"&ꢅ&ꢋꢇꢈꢉꢆꢄꢌꢈ(ꢅ%ꢋꢉꢅꢃꢄ%ꢋꢉ'ꢆ&ꢃꢋꢄꢅꢐ"ꢉꢐꢋ!ꢈ!ꢅꢋꢄꢇꢊꢁ

ꢕꢃꢌꢉꢋꢌꢍꢃꢐ ꢗꢈꢌꢍꢄꢋꢇꢋꢏꢊ ꢒꢉꢆ*ꢃꢄꢏ 0ꢛꢖꢝꢛ9</

DS21830D-page 21

25AA640A/25LC640A

ꢀꢁꢂꢃꢄꢅꢆꢇꢈꢄꢉꢊꢋꢌꢆꢍꢎꢄꢈꢆꢏꢈꢄꢊꢐꢆꢑꢒꢆꢂꢃꢄꢅꢆꢇꢄꢌꢓꢄꢔꢃꢆꢕꢖꢑꢗꢆMꢆ7ꢙ0ꢙ138ꢚꢆꢛꢛꢆꢜꢒꢅ ꢆ!*ꢍꢏꢑ#

ꢑꢒꢊꢃ, 2ꢋꢉꢅ&ꢍꢈꢅ'ꢋ!&ꢅꢌ"ꢉꢉꢈꢄ&ꢅꢐꢆꢌ+ꢆꢏꢈꢅ#ꢉꢆ*ꢃꢄꢏ!(ꢅꢐꢇꢈꢆ!ꢈꢅ!ꢈꢈꢅ&ꢍꢈꢅꢕꢃꢌꢉꢋꢌꢍꢃꢐꢅꢂꢆꢌ+ꢆꢏꢃꢄꢏꢅꢔꢐꢈꢌꢃ%ꢃꢌꢆ&ꢃꢋꢄꢅꢇꢋꢌꢆ&ꢈ#ꢅꢆ&ꢅ

ꢍ&&ꢐ133***ꢁ'ꢃꢌꢉꢋꢌꢍꢃꢐꢁꢌꢋ'3ꢐꢆꢌ+ꢆꢏꢃꢄꢏ

DS21830D-page 22

25AA640A/25LC640A

ꢀꢁꢂꢃꢄꢅꢆꢇꢈꢄꢉꢊꢋꢌꢆꢍꢎꢄꢈꢆꢏꢈꢄꢊꢐꢆꢑꢒꢆꢂꢃꢄꢅꢆꢇꢄꢌꢓꢄꢔꢃꢆꢕꢖꢑꢗꢆMꢆ7ꢙ0ꢙ138ꢚꢆꢛꢛꢆꢜꢒꢅ ꢆ!*ꢍꢏꢑ#

ꢑꢒꢊꢃ, 2ꢋꢉꢅ&ꢍꢈꢅ'ꢋ!&ꢅꢌ"ꢉꢉꢈꢄ&ꢅꢐꢆꢌ+ꢆꢏꢈꢅ#ꢉꢆ*ꢃꢄꢏ!(ꢅꢐꢇꢈꢆ!ꢈꢅ!ꢈꢈꢅ&ꢍꢈꢅꢕꢃꢌꢉꢋꢌꢍꢃꢐꢅꢂꢆꢌ+ꢆꢏꢃꢄꢏꢅꢔꢐꢈꢌꢃ%ꢃꢌꢆ&ꢃꢋꢄꢅꢇꢋꢌꢆ&ꢈ#ꢅꢆ&ꢅ

ꢍ&&ꢐ133***ꢁ'ꢃꢌꢉꢋꢌꢍꢃꢐꢁꢌꢋ'3ꢐꢆꢌ+ꢆꢏꢃꢄꢏ

DS21830D-page 23

25AA640A/25LC640A

APPENDIX A: REVISION HISTORY

Revision B

Corrections to Section 1.0, Electrical Characteristics.

Revision C

Features and Description, removed reference to Pb-

free packages; Revise Table 1-2: AC Characteristics,

parameters 7 and 8; Updated Packing Information/

Package Drawings; Add DFN Package; Removed

trademark from SPI.

Revision D (10/08)

Added TDFN Package; Updated Package Drawings.

DS21830D-page 24

25AA640A/25LC640A

THE MICROCHIP WEB SITE

CUSTOMER SUPPORT

Microchip provides online support via our WWW site at

www.microchip.com. This web site is used as a means

to make files and information easily available to

customers. Accessible by using your favorite Internet

browser, the web site contains the following

information:

Users of Microchip products can receive assistance

through several channels:

• Distributor or Representative

• Local Sales Office

• Field Application Engineer (FAE)

• Technical Support

• Product Support – Data sheets and errata,

application notes and sample programs, design

resources, user’s guides and hardware support

documents, latest software releases and archived

software

• Development Systems Information Line

Customers

should

contact

their

distributor,

representative or field application engineer (FAE) for

support. Local sales offices are also available to help

customers. A listing of sales offices and locations is

included in the back of this document.

• General Technical Support – Frequently Asked

Questions (FAQ), technical support requests,

online discussion groups, Microchip consultant

program member listing

Technical support is available through the web site

at: http://support.microchip.com

• Business of Microchip – Product selector and

ordering guides, latest Microchip press releases,

listing of seminars and events, listings of

Microchip sales offices, distributors and factory

representatives

CUSTOMER CHANGE NOTIFICATION

SERVICE

Microchip’s customer notification service helps keep

customers current on Microchip products. Subscribers

will receive e-mail notification whenever there are

changes, updates, revisions or errata related to a

specified product family or development tool of interest.

To register, access the Microchip web site at

www.microchip.com, click on Customer Change

Notification and follow the registration instructions.

DS21830D-page 25

25AA640A/25LC640A

READER RESPONSE

It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip prod-

uct. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our documentation

can better serve you, please FAX your comments to the Technical Publications Manager at (480) 792-4150.

Please list the following information, and use this outline to provide us with your comments about this document.

To:

Technical Publications Manager

Reader Response

Total Pages Sent ________

RE:

From:

Name

Company

Address

City / State / ZIP / Country

Telephone: (_______) _________ - _________

FAX: (______) _________ - _________

Application (optional):

Would you like a reply?

Y

N

25AA640A/25LC640A

DS21830D

Literature Number:

Device:

Questions:

1. What are the best features of this document?

2. How does this document meet your hardware and software development needs?

3. Do you find the organization of this document easy to follow? If not, why?

4. What additions to the document do you think would enhance the structure and subject?

5. What deletions from the document could be made without affecting the overall usefulness?

6. Is there any incorrect or misleading information (what and where)?

7. How would you improve this document?

DS21830D-page 26

25AA640A/25LC640A

PRODUCT IDENTIFICATION SYSTEM

To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.

PART NO.

Device

X

/XX

X

–

Examples:

Tape & Reel

Package

Temp Range

a)

25AA640A-I/MS = 64 kbit, 1.8V Serial

EEPROM, Industrial temp., MSOP

package

b)

25AA640AT-I/SN = 6 kbit, 1.8V Serial

EEPROM, Industrial temp., Tape & Reel, SOIC

package

Device:

25AA640A

25LC640A

=

64k-bit, 1.8V, SPI Serial EEPROM

64k-bit, 2.5V, SPI Serial EEPROM

c)

d)

e)

25LC640AT-E/SN = 64 kbit, 2.5V Serial

EEPROM, Extended temp., Tape & Reel, SOIC

package

25AA640AX = 64k-bit, 1.8V, SPI Serial EEPROM in alternate

pinout (ST only)

25LC640AX = 64k-bit, 2.5V, SPI Serial EEPROM

in alternate pinout (ST only)

25LC640AT-I/ST

=

64 kbit, 2.5V Serial

EEPROM, Industrial temp., Tape

TSSOP package

& Reel,

Tape & Reel:

Blank

T

=

Standard packaging

Tape & Reel

25LC640AXT-I/ST

= 64 kbit, 2.5V Serial

EEPROM, Industrial temp., Tape

Rotated pinout, TSSOP package

& Reel,

Temperature

Range:

I

E

=

-40°C to+85°C

-40°C to+125°C

Package:

MS

P

=

Plastic MSOP (Micro Small Outline), 8-lead

Plastic DIP (300 mil body), 8-lead

Plastic SOIC (3.90 mm body), 8-lead

TSSOP (4.4 mm body), 8-lead

DFN (5x6), 8-lead

SN

ST

MF

MNY⁽¹⁾

TDFN (2x3), 8-lead

Note 1:

“Y” indicates a Nickel Palladium Gold (NiPdAu) finish.

DS21830D-page 27

25AA640A/25LC640A

NOTES:

DS21830D-page 28

Note the following details of the code protection feature on Microchip devices:

•

Microchip products meet the specification contained in their particular Microchip Data Sheet.

•

Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the

intended manner and under normal conditions.

•

There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our

knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data

Sheets. Most likely, the person doing so is engaged in theft of intellectual property.

•

Microchip is willing to work with the customer who is concerned about the integrity of their code.

Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not

mean that we are guaranteeing the product as “unbreakable.”

Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our

products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts

allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.

Information contained in this publication regarding device

applications and the like is provided only for your convenience

and may be superseded by updates. It is your responsibility to

ensure that your application meets with your specifications.

MICROCHIP MAKES NO REPRESENTATIONS OR

WARRANTIES OF ANY KIND WHETHER EXPRESS OR

IMPLIED, WRITTEN OR ORAL, STATUTORY OR

OTHERWISE, RELATED TO THE INFORMATION,

INCLUDING BUT NOT LIMITED TO ITS CONDITION,

QUALITY, PERFORMANCE, MERCHANTABILITY OR

FITNESS FOR PURPOSE. Microchip disclaims all liability

arising from this information and its use. Use of Microchip

devices in life support and/or safety applications is entirely at

the buyer’s risk, and the buyer agrees to defend, indemnify and

hold harmless Microchip from any and all damages, claims,

suits, or expenses resulting from such use. No licenses are

conveyed, implicitly or otherwise, under any Microchip

intellectual property rights.

Trademarks

The Microchip name and logo, the Microchip logo, Accuron,

dsPIC, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,

PICSTART, rfPIC, SmartShunt and UNI/O are registered

trademarks of Microchip Technology Incorporated in the

U.S.A. and other countries.

FilterLab, Linear Active Thermistor, MXDEV, MXLAB,

SEEVAL, SmartSensor and The Embedded Control Solutions

Company are registered trademarks of Microchip Technology

Incorporated in the U.S.A.

Analog-for-the-Digital Age, Application Maestro, CodeGuard,

dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,

ECONOMONITOR, FanSense, In-Circuit Serial

Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB

Certified logo, MPLIB, MPLINK, mTouch, PICkit, PICDEM,

32

PICDEM.net, PICtail, PIC logo, PowerCal, PowerInfo,

PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, Total

Endurance, WiperLock and ZENA are trademarks of

Microchip Technology Incorporated in the U.S.A. and other

countries.

SQTP is a service mark of Microchip Technology Incorporated

in the U.S.A.

All other trademarks mentioned herein are property of their

respective companies.

Printed on recycled paper.

Microchip received ISO/TS-16949:2002 certification for its worldwide

headquarters, design and wafer fabrication facilities in Chandler and

Tempe, Arizona; Gresham, Oregon and design centers in California

and India. The Company’s quality system processes and procedures

are for its PIC^®MCUs and dsPIC^®DSCs, KEELOQ^®code hopping

devices, Serial EEPROMs, microperipherals, nonvolatile memory and

analog products. In addition, Microchip’s quality system for the design

and manufacture of development systems is ISO 9001:2000 certified.

DS21830D-page 29

WORLDWIDE SALES AND SERVICE

AMERICAS

ASIA/PACIFIC

EUROPE

Corporate Office

Asia Pacific Office

Suites 3707-14, 37th Floor

Tower 6, The Gateway

Harbour City, Kowloon

Hong Kong

Tel: 852-2401-1200

Fax: 852-2401-3431

India - Bangalore

Tel: 91-80-4182-8400

Fax: 91-80-4182-8422

Austria - Wels

Tel: 43-7242-2244-39

Fax: 43-7242-2244-393

2355 West Chandler Blvd.

Chandler, AZ 85224-6199

Tel: 480-792-7200

Fax: 480-792-7277

Technical Support:

http://support.microchip.com

Web Address:

www.microchip.com

Denmark - Copenhagen

Tel: 45-4450-2828

Fax: 45-4485-2829

India - New Delhi

Tel: 91-11-4160-8631

Fax: 91-11-4160-8632

France - Paris

Tel: 33-1-69-53-63-20

Fax: 33-1-69-30-90-79

India - Pune

Tel: 91-20-2566-1512

Fax: 91-20-2566-1513

Australia - Sydney

Tel: 61-2-9868-6733

Fax: 61-2-9868-6755

Atlanta

Duluth, GA

Tel: 678-957-9614

Fax: 678-957-1455

Germany - Munich

Tel: 49-89-627-144-0

Fax: 49-89-627-144-44

Japan - Yokohama

Tel: 81-45-471- 6166

Fax: 81-45-471-6122

China - Beijing

Tel: 86-10-8528-2100

Fax: 86-10-8528-2104

Italy - Milan

Tel: 39-0331-742611

Fax: 39-0331-466781

Korea - Daegu

Tel: 82-53-744-4301

Fax: 82-53-744-4302

Boston

China - Chengdu

Tel: 86-28-8665-5511

Fax: 86-28-8665-7889

Westborough, MA

Tel: 774-760-0087

Fax: 774-760-0088

Netherlands - Drunen

Tel: 31-416-690399

Fax: 31-416-690340

Korea - Seoul

China - Hong Kong SAR

Tel: 852-2401-1200

Fax: 852-2401-3431

Tel: 82-2-554-7200

Fax: 82-2-558-5932 or

82-2-558-5934

Chicago

Itasca, IL

Tel: 630-285-0071

Fax: 630-285-0075

Spain - Madrid

Tel: 34-91-708-08-90

Fax: 34-91-708-08-91

China - Nanjing

Tel: 86-25-8473-2460

Fax: 86-25-8473-2470

Malaysia - Kuala Lumpur

Tel: 60-3-6201-9857

Fax: 60-3-6201-9859

Dallas

Addison, TX

Tel: 972-818-7423

Fax: 972-818-2924

UK - Wokingham

Tel: 44-118-921-5869

Fax: 44-118-921-5820

China - Qingdao

Tel: 86-532-8502-7355

Fax: 86-532-8502-7205

Malaysia - Penang

Tel: 60-4-227-8870

Fax: 60-4-227-4068

Detroit

Farmington Hills, MI

Tel: 248-538-2250

Fax: 248-538-2260

China - Shanghai

Tel: 86-21-5407-5533

Fax: 86-21-5407-5066

Philippines - Manila

Tel: 63-2-634-9065

Fax: 63-2-634-9069

Kokomo

Kokomo, IN

Tel: 765-864-8360

Fax: 765-864-8387

China - Shenyang

Tel: 86-24-2334-2829

Fax: 86-24-2334-2393

Singapore

Tel: 65-6334-8870

Fax: 65-6334-8850

China - Shenzhen

Tel: 86-755-8203-2660

Fax: 86-755-8203-1760

Taiwan - Hsin Chu

Tel: 886-3-572-9526

Fax: 886-3-572-6459

Los Angeles

Mission Viejo, CA

Tel: 949-462-9523

Fax: 949-462-9608

China - Wuhan

Tel: 86-27-5980-5300

Fax: 86-27-5980-5118

Taiwan - Kaohsiung

Tel: 886-7-536-4818

Fax: 886-7-536-4803

Santa Clara

Santa Clara, CA

Tel: 408-961-6444

Fax: 408-961-6445

China - Xiamen

Tel: 86-592-2388138

Fax: 86-592-2388130

Taiwan - Taipei

Tel: 886-2-2500-6610

Fax: 886-2-2508-0102

Toronto

Mississauga, Ontario,

Canada

Tel: 905-673-0699

Fax: 905-673-6509

China - Xian

Tel: 86-29-8833-7252

Fax: 86-29-8833-7256

Thailand - Bangkok

Tel: 66-2-694-1351

Fax: 66-2-694-1350

China - Zhuhai

Tel: 86-756-3210040

Fax: 86-756-3210049

01/02/08

DS21830D-page 30


型号：	25LC640A-E/MF
厂家：	MICROCHIP
描述：	64K SPI Bus Serial EEPROM 64K SPI总线串行EEPROM 存储内存集成电路光电二极管可编程只读存储器电动程控只读存储器电可擦编程只读存储器时钟
文件：	总30页 (文件大小：510K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

25LC640A-E/MF [MICROCHIP]

相关型号：

SI9130DB

SI9135LG-T1

SI9135LG-T1-E3

SI9135_11

SI9136_11

SI9130CG-T1-E3

SI9130LG-T1-E3

SI9130_11

SI9137

SI9137DB

SI9137LG

SI9122E