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M14256 データシート(PDF) 2 Page - STMicroelectronics |
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M14256 データシート(HTML) 2 Page - STMicroelectronics |
2 / 12 page M14256, M14128 2/12 M14128 in wafer form, please contact your ST sales office. Each memory device is compatible with the I2C extended memory standard. This is a two wire se- rial interface that uses a bi-directional data bus and serial clock. The memory device carries a built-in 7-bit unique Device Type Identifier code (1010000) in accordance with the I2C bus defini- tion. Only one memory device can be attached to each I2C bus. The memory device behaves as a slave device in the I2C protocol, with all memory operations syn- chronized by the serial clock. Read and write op- erations are initiated by a START condition, generated by the bus master. The START condi- tion is followed by the Device Select Code which is composed of a stream of 7 bits (1010000), plus one read/write bit (R/W) and is terminated by an acknowledge bit. When writing data to the memory, the memory de- vice inserts an acknowledge bit during the 9th bit time, following the bus master’s 8-bit transmission. When data is read by the bus master, the bus master acknowledges the receipt of the data byte in the same way. Data transfers are terminated by a STOP condition after an Ack for WRITE, and af- ter a NoACK for READ. Power On Reset: VCC Lock-Out Write Protect In order to prevent data corruption and inadvertent write operations during power up, a Power On Re- set (POR) circuit is included. The internal reset is held active until the VCC voltage has reached the POR threshold value, and all operations are dis- abled – the device will not respond to any com- mand. In the same way, when VCC drops from the operating voltage, below the POR threshold value, all operations are disabled and the device will not respond to any command. A stable and valid VCC must be applied before applying any logic signal. SIGNAL DESCRIPTION Serial Clock (SCL) The SCL input pin is used to synchronize all data in and out of the memory. A pull up resistor can be connected from the SCL line to VCC. (Figure 3 in- dicates how the value of the pull-up resistor can be calculated). Serial Data (SDA) The SDA pin is bi-directional, and is used to trans- fer data in or out of the memory. It is an open drain output that may be wire-OR’ed with other open drain or open collector signals on the bus. A pull up resistor must be connected from the SDA bus to VCC. (Figure 3 indicates how the value of the pull-up resistor can be calculated). Figure 2. D22 Contact Connections AI02204 VCC GND SCL SDA WC Table 2. Absolute Maximum Ratings 1 Note: 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 the device at these or any other conditions above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating condi- tions for extended periods may affect device reliability. Refer also to the ST SURE Program and other relevant quality documents. 2. MIL-STD-883C, 3015.7 (100 pF, 1500 Ω) 3. EIAJ IC-121 (Condition C) (200 pF, 0 Ω) Symbol Parameter Value Unit TA Ambient Operating Temperature 0 to 70 °C TSTG Storage Temperature -40 to 120 °C VIO Input or Output range -0.6 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) 3 400 V |
同様の部品番号 - M14256 |
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同様の説明 - M14256 |
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