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25AA256/25LC256

256K SPI Bus Serial EEPROM

Device Selection Table

Part Number

25LC256

25AA256

Range

2.5-5.5V

1.8-5.5V

Page Size

64 Byte

Temp. Ranges

I, E

Packages

P, SN, SM, ST, MF

Features:

• Max. Clock 10 MHz

• Low-Power CMOS Technology:

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

- Read Current: 6 mA at 5.5V, 10 MHz

- Standby Current: 1

A

at 5.5V

• 32,768 x 8-bit Organization

• 64-Byte Page

• 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:

- Power-on/off data protection circuitry

- Write enable latch

- Write-protect pin

• Sequential Read

• High Reliability:

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

- Data retention: > 200 years

- ESD protection: > 4000V

• Temperature Ranges Supported:

- Industrial (I):

-40C to +85C

- Automotive (E):

-40°C to +125°C

• Pb-Free and RoHS Compliant

Description:

The Microchip Technology Inc. 25AA256/25LC256

(25XX256*) are 256 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

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

the device is controlled through a Chip Select (CS)

input.

Communication to the device can be paused via the

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

transitions on its inputs will be ignored, with the

exception of Chip Select, allowing the host to service

higher priority interrupts.

The 25XX256 is available in standard packages includ-

ing 8-lead PDIP and SOIC, and advanced packaging

including 8-lead DFN and 8-lead TSSOP.

Package Types (not to scale)

DFN

(MF)

CS 1

SO 2

WP 3

HOLD

SCK

PDIP/SOIC

(P, SN, SM)

HOLD

SCK

Pin Function Table

Name

SCK

HOLD

Function

Chip Select Input

Serial Data Output

Write-Protect

Ground

Serial Data Input

Serial Clock Input

Hold Input

Supply Voltage

HOLD

Rotated TSSOP

(ST)

SCK

TSSOP

(ST)

HOLD

SCK

* 25XX256 is used in this document as a generic part number

for the 25AA256/25LC256 devices.



2003-2013 Microchip Technology Inc.

DS21822G-page 1

25AA256/25LC256

1.0

ELECTRICAL CHARACTERISTICS

Absolute Maximum Ratings

(†)

.............................................................................................................................................................................6.5V

All inputs and outputs w.r.t. V

......................................................................................................... -0.6V to V

+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):

= -40°C to +85°C

Automotive (E): T

= -40°C to +125°C

Min.

0.7 V

-0.3

—

-0.5

—

Typ.

(2)

—

Max.

0.3 V

0.2 V

0.4

0.2

—

±1

Units

A

2.5V

< 2.5V

= 2.1 mA, V

= 4.5V

= 1.0 mA, V

= 2.5V

= -400

A

CS = V

, V

= V

SS OR

CS = V

, V

OUT

= V

SS OR

= 25°C, F

CLK

= 1.0 MHz,

= 5.0V

(Note

= 5.5V; F

CLK

= 10.0 MHz;

SO = Open

= 2.5V; F

CLK

= 5.0 MHz;

SO = Open

= 5.5V

= 2.5V

CS = V

= 5.5V, Inputs tied to V

or V

, 125°C

CS = V

= 5.5V, Inputs tied to V

or V

, 85°C

= 1.8V to 5.5V

Test Conditions

DC CHARACTERISTICS

Param.

No.

D001

D002

D003

D004

D005

D006

D007

D008

D009

Sym.

INT

Characteristic

High-level input

voltage

Low-level input

voltage

Low-level output

voltage

High-level output

voltage

Input leakage current

Output leakage

current

Internal Capacitance

(all inputs and

outputs)

D010

Read

Operating Current

—

Standby Current

—

2.5

0.5

0.6

0.15

0.1

2.5

A

D011

D012

Write

CCS

Note 1:

This parameter is periodically sampled and not 100% tested.

Typical measurements taken at room temperature (25°C).

DS21822G-page 2



2003-2013 Microchip Technology Inc.

25AA256/25LC256

TABLE 1-2:

AC CHARACTERISTICS

Industrial (I):

= -40°C to +85°C

Automotive (E): T

= -40°C to +125°C

Min.

—

100

150

100

200

250

—

100

150

100

150

—

Max.

—

100

—

100

160

—

160

—

Units

MHz

= 1.8V to 5.5V

Test Conditions

4.5V

Vcc 

5.5V

2.5V

Vcc 

4.5V

1.8V

Vcc 

2.5V

4.5V

Vcc 

5.5V

2.5V

Vcc 

4.5V

1.8V

Vcc 

2.5V

4.5V

Vcc 

5.5V

2.5V

Vcc 

4.5V

1.8V

Vcc 

2.5V

—

4.5V

Vcc 

5.5V

2.5V

Vcc 

4.5V

1.8V

Vcc 

2.5V

4.5V

Vcc 

5.5V

2.5V

Vcc 

4.5V

1.8V

Vcc 

2.5V

(Note

4.5V

Vcc 

5.5V

2.5V

Vcc 

4.5V

1.8V

Vcc 

2.5V

4.5V

Vcc 

5.5V

2.5V

Vcc 

4.5V

1.8V

Vcc 

2.5V

—

4.5V

Vcc 

5.5V

2.5V

Vcc 

4.5V

1.8V

Vcc 

2.5V

(Note

4.5V

Vcc 

5.5V

(Note

2.5V

Vcc 

4.5V

(Note

1.8V

Vcc 

2.5V

(Note

4.5V

Vcc 

5.5V

2.5V

Vcc 

4.5V

1.8V

Vcc 

2.5V

4.5V

Vcc 

5.5V

2.5V

Vcc 

4.5V

1.8V

Vcc 

2.5V

AC CHARACTERISTICS

Param.

Sym.

No.

CLK

Characteristic

Clock Frequency

CSS

CS Setup Time

CSH

CS Hold Time

CSD

Tsu

CS Disable Time

Data Setup Time

Data Hold Time

CLK Rise Time

CLK Fall Time

Clock High Time

Clock Low Time

CLD

CLE

Clock Delay Time

Clock Enable Time

Output Valid from Clock

Low

Output Hold Time

Output Disable Time

DIS

HOLD Setup Time

HOLD Hold Time

Note 1:

This parameter is periodically sampled and not 100% tested.

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

is complete.

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.



2003-2013 Microchip Technology Inc.

DS21822G-page 3

25AA256/25LC256

TABLE 1-2:

AC CHARACTERISTICS (CONTINUED)

Industrial (I):

= -40°C to +85°C

Automotive (E): T

= -40°C to +125°C

Min.

160

—

Max.

—

Units

= 1.8V to 5.5V

Test Conditions

4.5V

Vcc 

5.5V

(Note

2.5V

Vcc 

4.5V

(Note

1.8V

Vcc 

2.5V

(Note

4.5V

Vcc 

5.5V

2.5V

Vcc 

4.5V

1.8V

Vcc 

2.5V

(Note

AC CHARACTERISTICS

Param.

Sym.

No.

Characteristic

HOLD Low to Output

High-Z

HOLD High to Output

Valid

Internal Write Cycle

Time

Endurance

—

E/W 25°C, V

= 5.5V

(Note

Cycles

Note 1:

This parameter is periodically sampled and not 100% tested.

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

is complete.

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.

TABLE 1-3:

AC Waveform:

= 0.2V

AC TEST CONDITIONS

—

(Note

—

0.5 V

= V

– 0.2V

= 4.0V

= 50 pF

Timing Measurement Reference Level

Input

Output

Note 1:

For V



4.0V

For V

> 4.0V

DS21822G-page 4



2003-2013 Microchip Technology Inc.

25AA256/25LC256

FIGURE 1-1:

SCK

n+2

n+1

High-Impedance

n-1

HOLD TIMING

Don’t Care

HOLD

n+2

n+1

FIGURE 1-2:

SERIAL INPUT TIMING

Mode

1,1

SCK

Mode

0,0

LSB in

MSB in

High-Impedance

FIGURE 1-3:

SERIAL OUTPUT TIMING

SCK

MSB out

Don’t Care

ISB out

Mode

1,1

Mode

0,0



2003-2013 Microchip Technology Inc.

DS21822G-page 5

型号	25AA256T-E-SM	25AA256-E-P	25AA256T-E-ST	25AA256T-E-MF	25AA256-E-ST
描述	EEPROM 256k, 32K X 8, 1.8V SER EE EXT	Motor / Motion / Ignition Controllers u0026 Drivers H-BRIDGE 36V max 1 Chan 1.0A 1.5ohm	EEPROM 256k, 32K X 8, 1.8V SER EE EXT	EEPROM 256k, 32K X 8, 1.8V SER EE EXT	LDO Voltage Regulators 4A Ultra-Low-Input-V LDO Regulator
产品种类 Product Category	EEPROM	EEPROM	EEPROM	EEPROM	EEPROM
制造商 Manufacturer	Microchip(微芯科技)	Microchip(微芯科技)	Microchip(微芯科技)	Microchip(微芯科技)	Microchip(微芯科技)
RoHS	Details	Details	Details	Details	Details
安装风格 Mounting Style	SMD/SMT	Through Hole	SMD/SMT	SMD/SMT	SMD/SMT
封装 / 箱体 Package / Case	SOIJ-8	PDIP-8	TSSOP-8	DFN-8	TSSOP-8
Memory Size	256 kbit	256 kbit	256 kbit	256 kbit	256 kbit
接口类型 Interface Type	Serial, 4-Wire, SDI, SPI	Serial, 4-Wire, SDI, SPI	Serial, 4-Wire, SDI, SPI	Serial, 4-Wire, SDI, SPI	Serial, 4-Wire, SDI, SPI
Organization	32 k x 8	32 k x 8	32 k x 8	32 k x 8	32 k x 8
Data Retention	200 Year	200 Year	200 Year	200 Year	200 Year
系列 Packaging	Reel	Tube	Reel	Reel	Tube
工厂包装数量 Factory Pack Quantity	2100	60	2500	3300	100
单位重量 Unit Weight	-	0.032805 oz	0.005573 oz	0.001319 oz	0.005573 oz