ST24C08 STMICROELECTRONICS | Alldatasheet
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ST24C08, ST25C08 ST24W08, ST25W08
8 Kbit Serial I2C Bus EEPROM
with User-Defined Block Write Protection February 1999 1/16 AI00860E E SDA VCC ST24x08 ST25x08 MODE/WC* SCL VSS PRE Figure 1. Logic Diagram
1 MILLION ERASE/WRITE CYCLES with
40 YEARS DATA RETENTION
DESCRIPTION
This specification covers a range of 8 Kbits I2C bus EEPROM products, the ST24/25C08 and the ST24/25W08. In the text, products are referred to as ST24/25x08, where "x" is: "C" for Standard version and "W" for Hardware Write Control ver- sion. PRE Write Protect Enable E Chip Enable Input SDA Serial Data Address Input/Output SCL Serial Clock MODE Multibyte/Page Write Mode (C version) WC Write Control (W version) VCC Supply Voltage VSS Ground Table 1. Signal Names Note: WC signal is only available for ST24/25W08 products.
- Multibyte Write not available in ST24/25W08 versions.
Table 4. Operating Modes (1) Note: The MSB b7 is sent first. Table 3. Device Select Code nated with a STOP condition. and the device will not respond to any command. must be applied before applying any logic signal. to act as a pull up (see Figure 3). and is used to transfer data in or out of the memory. CC to act as pull up (see Figure 3). the memory area is not write protected.
Figure 3. Maximum RL Value versus Bus Capacitance (CBUS ) for an I2C Bus tailed information about Write Control feature. devices in all communications. the internal EEPROM write cycle. ONLY when the SCL line is low. code (7 bits) and a READ or WRITE bit.
Note: 1. Sampled only, not 100% tested. Table 5. Input Parameters (1) (TA = 25 °C, f = 100 kHz ) Table 6. DC Characteristics
tion on the SDA bus during the 9th bit time. Input and Output Timing Ref. Table 8. AC Measurement Conditions Figure 4. AC Testing Input Output Waveforms Notes:1. For a reSTART condition, or following a write cycle.
- The minimum value delays the falling/rising edge of SDA away from SCL = 1 in order to avoid unwanted START and/or STOP
- In the Multibyte Write mode only, if accessed bytes are on two consecutive 8 bytes rows (6 address MSB are not constant) the
maximum programming time is doubled to 20ms. Table 7. AC Characteristics
Figure 5. AC Waveforms cally with CMOS input levels. with WC = 1 will not modify the memory content. or VIL, to minimize the standby current.
Figure 6. I2C Bus Protocol
tion was already sent during Step 1). Protect Flag (bit b2 in location 3FFh) is set to ’0’. protected when the PRE input pin is taken High. the content defined in the location 3FFh, by 7 bytes. Figure 9. Write Modes Sequence (ST24/25C08)
Figure 10. Write Modes Sequence with Write Control = 1 (ST24/25W08) address counter. This counter is then incremented.
data transfer and switches to a standby state. Figure 11. Read Modes Sequence Note: * The 7 Most Significant bits of DEV SEL bytes of a Random Read (1st byte and 3rd byte) must be identical.
ORDERING INFORMATION SCHEME Notes:1. Temperature range on special request only. Devices are shipped from the factory with the memory content set at all "1’s" (FFh). For a list of available options (Operating Voltage, Package, etc...) or for further information on any aspect of this device, please contact the STMicroelectronics Sales Office nearest to you. to you. Operating Voltage ST24C08 3V to 5.5V ST24W08 3V to 5.5V ST25C08 2.5V to 5.5V ST25W08 2.5V to 5.5V Range Standard Hardware Write Control Standard Hardware Write Control Package B PSDIP8 0.25mm Frame M SO8 150mil Width Temperature Range 1 0 to 70 °C 5 (1) –20 to 85 °C 6 –40 to 85 °C 3 –40 to 125 °C Option TR Tape & Reel Packing Example: ST24C08 M 1 TR ST24/25C08, ST24/25W08
A L D E1 E N C eA eB B Symb mm inches Typ Min Max Typ Min Max A 3.90 5.90 0.154 0.232 A1 0.49 – 0.019 – A2 3.30 5.30 0.130 0.209 B 0.36 0.56 0.014 0.022 B1 1.15 1.65 0.045 0.065 C 0.20 0.36 0.008 0.014 D 9.20 9.90 0.362 0.390 E1 6.00 6.70 0.236 0.264 eA 7.80 – 0.307 – eB – 10.00 – 0.394 L 3.00 3.80 0.118 0.150 N8 8 Drawing is not to scale PSDIP8 - 8 pin Plastic Skinny DIP, 0.25mm lead frame ST24/25C08, ST24/25W08
E N CP B e A D C LA1 α H h x 45˚ Symb mm inches Typ Min Max Typ Min Max A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.004 0.010 B 0.33 0.51 0.013 0.020 C 0.19 0.25 0.007 0.010 D 4.80 5.00 0.189 0.197 E 3.80 4.00 0.150 0.157 e1 . 2 7– – 0 . 0 5 0 – – H 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 L 0.40 0.90 0.016 0.035 α 0° 8° 0° 8° N8 8 CP 0.10 0.004 Drawing is not to scale SO8 - 8 lead Plastic Small Outline, 150 mils body width ST24/25C08, ST24/25W08
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. The ST logo is a registered trademark of STMicroelectronics © 1999 STMicroelectronics - All Rights Reserved All other names are the property of their respective owners STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Mexico - Morocco - The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. http://www.st.com ST24/25C08, ST24/25W08