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ST24FC21B1TR Scheda tecnica(PDF) 3 Page - STMicroelectronics |
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ST24FC21B1TR Scheda tecnica(HTML) 3 Page - STMicroelectronics |
3 / 22 page Symbol Parameter Value Unit TA Ambient Operating Temperature –40 to 85 °C TSTG Storage Temperature –65 to 150 °C TLEAD Lead Temperature, Soldering (SO8 package) (PSDIP8 package) 40 sec 10 sec 215 260 °C VIO Input or Output Voltages –0.3 to 6.5 V VCC Supply Voltage –0.3 to 6.5 V VESD Electrostatic Discharge Voltage (Human Body model) (2) 4000 V Electrostatic Discharge Voltage (Machine model) (3) 500 V Notes: 1. Except for the rating "Operating Temperature Range", stresses above those listed in the Table "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only and operation of thedevice at these or any other conditions above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents. 2. MIL-STD-883C, 3015.7 (100pF, 1500 Ω). 3. EIAJ IC-121 (Condition C) (200pF, 0 Ω). Table 2. Absolute Maximum Ratings (1) Device Code Chip Enable RW Bit b7 b6 b5 b4 b3 b2 b1 b0 Device Select 1 0 1 0 X X X RW Note: The MSB b7 is sent first. X = 0 or 1. Table 3A. Device Select Code (ST24LC21B, ST24LW21, ST24FC21 and ST24FW21) The ST24xy21 can operate in two modes: Trans- mit-Only mode and I2C bidirectional mode. When powered, the device is in Transmit-Only mode with EEPROM data clocked out from the rising edge of the signal applied on VCLK. The device will switch to the I2C bidirectional mode upon the falling edge of the signal applied on SCL pin. When in I2C mode, the ST24LC21B (or the ST24LW21) cannot switch back to the Transmit Only mode (except when the power supply is re- moved). For the ST24FC21, ST24FC21B (or the ST24FW21), after the falling edge of SCL, the memory enter in a transition state which allowed to switch back to the Transmit-Only mode if no valid I2C activity is observed. Both Plastic Dual-in-Line and Plastic Small Outline packages are available. Transmit Only Mode After a Power-up, the ST24xy21 is in the Transmit Only mode. A proper initialization sequence (see Figure 3) must supply nine clock pulses on the VCLK pin (in order to internally synchronize the device). During this initialization sequence, the SDA pin is in high impedance. On the rising edge of the tenth pulse applied on VCLK pin, the device will output the first bit of byte located at address 00h (most significant bit first). DESCRIPTION (cont’d) Device Code Chip Enable RW Bit b7 b6 b5 b4 b3 b2 b1 b0 Device Select 1 010000 RW Note: The MSB b7 is sent first. X = 0 or 1. Table 3B. Device Select Code (ST24FC21B) 3/22 ST24LC21B, ST24LW21, ST24FC21, ST24FC21B, ST24FW21 |
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