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AN995 APPLICATION NOTE
Changing from the ST24xxx and ST25xxx to the M24xxx In Your Application
This document is written for users of the ranges of EEPROM device shown in Table 1. Table 1. ST24xxx and ST25xxx Devices VCC = 3.0 to 5.5 V
ST24C01 ST24C02 ST24C04 ST24C08 ST24W01 ST24W02 ST24W04 ST24W08 ST25C01 ST25C02 ST25C04 ST25C08
VCC = 2.5 to 5.5 V
ST25W01 ST25W02 ST25W04 ST25W08
VCC = 4.5 to 5.5 V
ST24C16 ST24164 ST24E32 ST24E64 ST24W16 ST25C16
VCC = 2.5 to 5.5 V
ST25W16 ST25164 ST25E32 ST25E64
The above devices, in all variations of package and temperature range, are to be discontinued. They can be replaced by equivalents in the more advanced M24xxx range, shown in Table 2. Table 2. M24xxx Devices VCC = 4.5 to 5.5 V
M24C01 M24C02 M24C04 M24C08 M24C16 M24164 M24C32 M24C64
VCC = 2.5 to 5.5 V
M24C01-W M24C02-W M24C04-W M24C08-W M24C16-W M24164-W M24C32-W M24C64-W
For the majority of applications, the M24xxx devices can be treated as pin compatible with, and functionally equivalent to, the ST24xxx and ST25xxx devices, as listed in the first two columns of Table 3. There are some exceptional cases, though. For these, the third column of Table 3 draws attention to the notes below the table.
March 2000
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AN995 - APPLICATION NOTE
Table 3. Approximate Equivalents
Memory Capacity Previous device ST24C01 ST24W01 1 Kbit ST25C01 ST25W01 ST24C02 ST24W02 2 Kbit ST25C02 ST25W02 ST24C04 ST24W04 4 Kbit ST25C04 ST25W04 ST24C08 ST24W08 8 Kbit ST25C08 ST25W08 ST24164 ST24C16 ST24W16 16 Kbit ST25164 ST25C16 ST25W16 ST24E32 32 Kbit ST25E32 ST24E64 64 Kbit ST25E64 M24C64-W M24C32-W M24C64 M24164-W M24C16-W M24C16-W M24C32 Notes 1, 2 Note 1 M24C08-W M24C08-W M24164 M24C16 M24C16 Notes 1, 2 Note 1 Notes 1, 2 Note 1 M24C04-W M24C04-W M24C08 M24C08 Notes 1, 2 Note 1 Notes 1, 2, 3 Note 1, 3 M24C02-W M24C02-W M24C04 M24C04 Notes 1, 2, 3 Note 1, 3 M24C01-W M24C01-W M24C02 M24C02 Note 2, 3 Note 3 Note 2 Replacement M24C01 M24C01 Exceptions Note 2, 3 Note 3 Note 2
Note 1: If, in the application, the Protect Enable (PRE) pin (pin 1) is always held Low, the M24xxx family can be used as a direct replacement for the original device. If the PRE pin is held High, or is allowed to vary, the replacement is not so direct, and the designer is advised to contact the ST local sales office for technical support (or to e-mail the technical support electronic mail address: ask.memory@st.com).
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AN995 - APPLICATION NOTE
Note 2: If, in the application, the MODE pin (pin 7) is always held Low, the multibyte write mode of the device is never used, and the M24xxx family can be used as a direct replacement for the original device. If the MODE pin is held High, or is allowed to vary, the replacement is not so direct, and the designer is advised to contact the ST local sales office for technical support (or to e-mail the technical support electronic mail address: ask.memory@st.com). Note 3: If, in the application, VCC is kept in the range 4.5 V to 5.5 V, the M24xxx family can be used as a direct replacement for the original device. If V CC is used in the range 3.0 V to 4.5 V, the equivalent M24xxx-W device can be used as a direct replacement for the original device.
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For current information on ST products, please consult our pages on the world wide web: www.st.com If you have any questions or suggestions concerning the matters raised in this document, please send them to the following electronic mail addresses:
apps.eeprom@st.com ask.memory@st.com
(for application support) (for general enquiries)
Please remember to include your name, company, location, telephone number and fax number.
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. (c) 2000 STMicroelectronics - All Rights Reserved The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com
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