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M29F002BNT45P6T Datasheet(PDF) 4 Page - STMicroelectronics |
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M29F002BNT45P6T Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 22 page M29F002BT, M29F002BB, M29F002BNT, M29F002BNB 4/22 SIGNAL DESCRIPTIONS See Figure 1, Logic Diagram, and Table 1, Signal Names, for a brief overview of the signals connect- ed to this device. Address Inputs (A0-A17). The Address Inputs select the cells in the memory array to access dur- ing Bus Read operations. During Bus Write opera- tions they control the commands sent to the Command Interface of the internal state machine. Data Inputs/Outputs (DQ0-DQ7). The Data In- puts/Outputs output the data stored at the selected address during a Bus Read operation. During Bus Write operations they represent the commands sent to the Command Interface of the internal state machine. Chip Enable (E). The Chip Enable, E, activates the memory, allowing Bus Read and Bus Write op- erations to be performed. When Chip Enable is High, VIH, all other pins are ignored. Output Enable (G). The Output Enable, G, con- trols the Bus Read operation of the memory. Write Enable (W). The Write Enable, W, controls the Bus Write operation of the memory’s Com- mand Interface. Reset/Block Temporary Unprotect (RP). The Re- set/Block Temporary Unprotect pin can be used to apply a Hardware Reset to the memory or to tem- porarily unprotect all blocks that have been pro- tected. On the M29F002BNT the pin is not connected internally and this feature is not avail- able. A Hardware Reset is achieved by holding Reset/ Block Temporary Unprotect Low, VIL, for at least tPLPX. After Reset/Block Temporary Unprotect goes High, VIH, the memory will be ready for Bus Read and Bus Write operations after tPHEL or tPLYH, whichever occurs last. See Table 15 and Figure 12, Reset/Temporary Unprotect AC Char- acteristics for more details. Holding RP at VID will temporarily unprotect the protected blocks in the memory. Program and Erase operations on all blocks will be possible. The transition from VIH to VID must be slower than tPHPHH. Reset/Block Temporary Unprotect can be left un- connected. A weak internal pull-up resistor en- sures that the memory always operates correctly. VCC Supply Voltage. The VCC Supply Voltage supplies the power for all operations (Read, Pro- gram, Erase etc.). The Command Interface is disabled when the VCC Supply Voltage is less than the Lockout Voltage, VLKO. This prevents Bus Write operations from ac- cidentally damaging the data during power up, power down and power surges. If the Program/ Erase Controller is programming or erasing during this time then the operation aborts and the memo- ry contents being altered will be invalid. A 0.1µF capacitor should be connected between the VCC Supply Voltage pin and the VSS Ground pin to decouple the current surges from the power supply. The PCB track widths must be sufficient to carry the currents required during program and erase operations, ICC4. VSS Ground. The VSS Ground is the reference for all voltage measurements. |
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