© 2008 Microchip Technology Inc.

DS21227F-page 1

25AA320/25LC320/25C320

Device Selection Table

Features:

• Low-Power CMOS Technology:

- Write current: 3 mA maximum

- Read current: 500

μA, typical

- Standby current: 500 nA, typical

• 4096 x 8 Bit Organization

• 32 Byte Page

• Write Cycle Time: 5 ms Maximum

• 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 E/W cycles

- Data retention: > 200 years

- ESD protection: > 4000V

• 8-Pin PDIP, SOIC and TSSOP Packages

• 14-Lead TSSOP Package

• Temperature Ranges Supported:

Description:

The Microchip Technology Inc. 25AA320/25LC320/

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.

Block Diagram

Package Types

Part

Number

Range

Max. Clock

Frequency

Temp.

Ranges

25AA320

1.8-5.5V

1 MHz

I

25LC320

2.5-5.5V

2 MHz

I,E

25C320

4.5-5.5V

3 MHz

I,E

- Industrial (I):

-40

°Cto +85°C

- Automotive (E):

-40°C to +125°C

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

Latches

XDEC

TSSOP

PDIP, SOIC

TSSOP

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

NC

CS

SO

NC

WP

NC

NC

HOLD

NC

SCK

SI

NC

1

2

3

4

14

13

12

11

510

9

78

6

32K SPI Bus Serial EEPROM

*25XX320 is used in this document as a generic part number for the 25AA320/25LC320/25C320 devices.

Not recommended for new designs –

Please use 25AA320A or 25LC320A.