25AA256_25LC256| Datasheet

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25AA256/25LC256
256K SPI Bus Serial EEPROM
Device Selection Table
Part Number 25LC256 25AA256 VCC Range 2.5-5.5V 1.8-5.5V Page Size 64 Byte 64 Byte Temp. Ranges I, E I Packages P, SN, SM, ST, MF 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 including 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 VSS 4 8 7 6 5 VCC HOLD SCK SI CS SO WP VSS

PDIP/SOIC
(P, SN, SM)
1 2 3 4 8 7 6 5 VCC HOLD SCK SI

Pin Function Table
Name CS SO WP VSS SI SCK HOLD VCC Function Chip Select Input Serial Data Output Write-Protect Ground Serial Data Input Serial Clock Input Hold Input Supply Voltage
CS SO WP VSS 1 2 3 4 HOLD VCC CS SO 1 2 3 4

Rotated TSSOP (ST)
8 7 6 5 SCK SI VSS WP

TSSOP
(ST)
8 7 6 5 VCC HOLD SCK SI

* 25XX256 is used in this document as a generic part number for the 25AA256, 25LC256 devices.

2007 Microchip Technology Inc.

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