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M58WT032KB Datasheet(PDF) 17 Page - Numonyx B.V |
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M58WT032KB Datasheet(HTML) 17 Page - Numonyx B.V |
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17 / 117 page  M58WTxxxKT, M58WTxxxKB Signal descriptions 17/117 2.13 VPP program supply voltage VPP is both a control input and a power supply pin. The two functions are selected by the voltage range applied to the pin. If VPP is kept in a low voltage range (0 V to VDDQ) VPP is seen as a control input. In this case a voltage lower than VPPLK provides absolute protection against program or erase, while VPP in the VPP1 range enables these functions (see Tables 21 and 22, DC characteristics for the relevant values). VPP is only sampled at the beginning of a program or erase; a change in its value after the operation has started does not have any effect and program or erase operations continue. If VPP is in the range of VPPH it acts as a power supply pin. In this condition VPP must be stable until the program/erase algorithm is completed. 2.14 VSS ground VSS is the common ground reference for all votage measurements in the Flash (core and I/O buffers). It must be connected to the system ground. Note: Each device in a system should have VDD, VDDQ and VPP decoupled with a 0.1 µF ceramic capacitor close to the pin (high-frequency, inherently-low inductance capacitors should be as close as possible to the package). See Figure 9: AC measurement load circuit. The PCB track widths should be sufficient to carry the required VPP program and erase currents. |
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