ST24C16 STMICROELECTRONICS | Alldatasheet
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ST24C16, ST25C16 ST24W16, ST25W16
16 Kbit Serial I2C Bus EEPROM
with User-Defined Block Write Protection February 1999 1/17 AI00866B PB0-PB1 SDA VCC ST24x16 ST25x16 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 16 Kbit I 2C bus EEPROM products, the ST24/25C16 and the ST24/25W16. In the text, products are referred to as ST24/25x16 where "x" is: "C" for Standard ver- sion and "W" for hardware Write Control version. The ST24/25x16 are 16 Kbit electrically erasable programmable memories (EEPROM), organized as 8 blocks of 256 x8 bits. These are manufactured in STMicroelectronics’s Hi-Endurance Advanced CMOS technology which guarantees an endur- PRE Write Protect Enable PB0, PB1 Protect Block Select SDA Serial Data Address Input/Output SCL Serial Clock MODE Multybyte/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 ST24/25W16 products.
Table 4. Operating Modes Note: The MSB b7 is sent first. Table 3. Device Select Code serting an acknowledge bit during the 9th bit time. and the device will not respond to any command. must be applied before applying any logic signal.
Figure 3. Maximum RL Value versus Bus Capacitance (CBUS ) for an I2C Bus 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). inputs have a CMOS compatible input level. is internally read as VIH (Multibyte Write mode). other write modes are fully supported. tailed information about Write Control feature.
Note: 1. Sampled only, not 100% tested. Table 5. Input Parameters (1) (TA = 25 °C, f = 100 kHz ) Table 6. DC Characteristics
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 (5 address MSB are not constant)
the maximum programming time is doubled to 20ms. Table 7. AC Characteristics devices in all communications. Figure 4. AC Testing Input Output Waveforms Input and Output Timing Ref. Table 8. AC Measurement Conditions
Figure 5. AC Waveforms
triggers the internal EEPROM write cycle. Figure 6. I2C Bus Protocol ONLY when the SCL line is low. W = 1) or WRITE (RW = 0) operation. There are three modes both for read and write. and the slave is ended with a STOP condition.
cally with CMOS input levels. cess to any of the 256 bytes of one memory block. responds with an acknowledge. on data bytes, as in Figure 10. or VIL, to minimize the stand-by current. tibyte Write mode, the MODE pin must be at VIH. following bytes of this same row. Figure 7. Memory Protection
the memory will not respond to any request. Figure 8. Write Cycle Polling using ACK Minimizing System Delay by Polling On ACK. instruction was already sent during Step 1).
256 bytes of the memory may be write protected. tected when the PRE input is taken High. 7FFh can be used as a normal EEPROM byte. the content defined in the location 7FFh, by 7 bytes. Figure 9. Write Modes Sequence (ST24/25C16)
Figure 10. Write Modes Sequence with Write Control = 1 (ST24/25W16) address counter. This counter is then incremented.
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. data transfer and switches to a standby state.
24 4.5V to 5.5V 25 2.5V to 5.5V Range C Standard W Hardware Write Control Package B PSDIP8 0.25mm Frame M SO8 150mil Width Temperature Range 1 0 to 70 °C 6 –40 to 85 °C 3 (1) –40 to 125 °C Option TR Tape & Reel Packing Example: ST24C16 M 1 TR ORDERING INFORMATION SCHEME Note: 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. ST24/25C16, ST24/25W16
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 ST24/25C16, ST24/25W16
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 ST24/25C16, ST24/25W16
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 Purchase of I2C Components by STMicroelectronics, conveys a license under the Philips I2C Patent. Rights to use these components in an I2C system, is granted provided that the system conforms to the I2C Standard Specifications as defined by Philips. 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 ST24/25C16, ST24/25W16