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M24256-BRDW6P Datasheet(PDF) 4 Page - STMicroelectronics |
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M24256-BRDW6P Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 25 page M24128-BW, M24128-BR, M24256-BW, M24256-BR 4/25 SUMMARY DESCRIPTION These I2C-compatible electrically erasable pro- grammable memory (EEPROM) devices are orga- nized as 32K x 8 bits (M24256-BW and M24256- BR) and 16K x 8 bits (M24128-BW and M24128- BR). Figure 2. Logic Diagram Table 2. Signal Names I2C uses a two-wire serial interface, comprising a bi-directional data line and a clock line. The devic- es carry a built-in 4-bit Device Type Identifier code (1010) in accordance with the I2C bus definition. The device behaves as a slave in the I2C protocol, with all memory operations synchronized by the serial clock. Read and Write operations are initiat- ed by a Start condition, generated by the bus mas- ter. The Start condition is followed by a Device Select Code and Read/Write bit (RW) (as de- scribed in Table 3.), terminated by an acknowl- edge bit. When writing data to the memory, the device in- serts 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 after a NoAck for Read. Power On Reset In order to prevent inadvertent Write operations during Power Up, a Power On Reset (POR) circuit is implemented. At Power Up, the device will not respond to any in- struction until VCC has reached the POR threshold voltage (this threshold is lower than the VCC mini- mum operating voltage defined in Table 8. and Ta- ble 9.). In the same way, as soon as VCC drops from the normal operating voltage, below the POR threshold voltage, all the operations are disabled and the device will not respond to any instruction. Prior to selecting and issuing instructions to the memory, a valid and stable VCC voltage must be applied. This voltage must remain stable and valid until the end of the transmission of the instruction and, for a Write instruction, until the completion of the internal write cycle (tW). Figure 3. DIP, SO and TSSOP Connections Note: See PACKAGE MECHANICAL section for package dimen- sions, and how to identify pin-1. E0, E1, E2 Chip Enable SDA Serial Data SCL Serial Clock WC Write Control VCC Supply Voltage VSS Ground AI02809 SDA VCC M24256-B M24128-B WC SCL VSS 3 E0-E2 SDA VSS SCL WC E1 E0 VCC E2 AI02810B M24256-B M24128-B 1 2 3 4 8 7 6 5 |
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