© 2006 Microchip Technology Inc.

DS21204E-page 1

25AA040/25LC040/25C040

Device Selection Table

Features:

• Low-power CMOS technology:

- Write current: 3 mA, typical

- Read current: 500

μA, typical

- Standby current: 500 nA, typical

• 512 x 8-bit organization

• 16 byte page

• Write cycle time: 5 ms max.

• Self-timed Erase and Write cycles

• 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: 1M cycles

- Data retention: > 200 years

- ESD protection: > 4000V

• 8-pin PDIP, SOIC and TSSOP packages

• Temperature ranges supported:

Description:

The Microchip Technology Inc. 25AA040/25LC040/

Erasable PROM. 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, transi-

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

Chip Select, allowing the host to service higher priority

interrupts. Also, write operations to the device can be

disabled via the write-protect pin (WP).

Package Types

Block Diagram

Part

Number

Range

Max. Clock

Frequency

Temp.

Ranges

25AA040

1.8-5.5V

1 MHz

I

25LC040

2.5-5.5V

2 MHz

I

25C040

4.5-5.5V

3 MHz

I,E

- Industrial (I):

-40

°Cto +85°C

- Automotive (E) (25C040):

-40°C to +125°C

CS

SO

WP

HOLD

SCK

SI

1

2

3

4

8

7

6

5

CS

SO

WP

HOLD

SCK

SI

1

2

3

4

8

7

6

5

HOLD

CS

SO

1

2

3

4

8

7

6

5

SCK

SI

WP

PDIP

SOIC

TSSOP

SI

SO

SCK

CS

HOLD

WP

STATUS

Register

I/O Control

Memory

Control

Logic

HV Generator

EEPROM

Array

Page

Y Decoder

Sense Amp.

R/W Control

Logic

XDEC

Latches

4K SPI Bus Serial EEPROM

*25XX040 is used in this document as a generic part number

for the 25AA040/25LC040/25C040 devices.

Not recommended for new designs –

Please use 25AA040A or 25LC040A.