25AA040_C040_LC040| Datasheet

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Not recommended for new designs Please use 25AA040A or 25LC040A.

25AA040/25LC040/25C040
4K SPI Bus Serial EEPROM
Device Selection Table
Part Number 25AA040 25LC040 25C040 VCC Range 1.8-5.5V 2.5-5.5V 4.5-5.5V Max. Clock Frequency 1 MHz 2 MHz 3 MHz Temp. Ranges I I I,E 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. Also, write operations to the device can be disabled via the write-protect pin (WP).

Package Types
PDIP
CS SO 1 8 VCC HOLD SCK SI

2 3 4

25XX040

Features:
Low-power CMOS technology: - Write current: 3 mA, typical - Read current: 500 A, 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: - Industrial (I): -40 C to +85 C - Automotive (E) (25C040): -40 C to +125 C

7 6 5

WP VSS

SOIC

CS SO WP VSS

1

8

VCC HOLD SCK SI

2 3 4

25XX040
1 2 3 4

7 6 5

TSSOP 25XX040
HOLD VCC CS SO 8 7 6 5 SCK SI VSS WP

Block Diagram
STATUS Register HV Generator

I/O Control Logic

Description:
The Microchip Technology Inc. 25AA040/25LC040/ 25C040 (25XX040*) is a 4 Kbit serial Electrically 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.
*25XX040 is used in this document as a generic part number for the 25AA040/25LC040/25C040 devices.

Memory Control Logic

EEPROM Array XDEC Page Latches

SI SO CS SCK HOLD WP VCC VSS

Y Decoder

Sense Amp. R/W Control

2006 Microchip Technology Inc.

DS21204E-page 1

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25AA040_C040_LC040 DATASHEET