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M36WT8B85ZA6T Datasheet(PDF) 10 Page - STMicroelectronics |
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M36WT8B85ZA6T Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 92 page M36WT864TF, M36WT864BF 10/92 vice. It is the main power supply for all Flash oper- ations (Read, Program and Erase). VDDQF and VDDS Supply Voltage. VDDQF pro- vides the power supply for the Flash memory I/O pins and VDDS provides the power supply for the SRAM control and I/O pins. This allows all Outputs to be powered independently from the Flash core power supply, VDDF. VDDQF can be tied to VDDS or it can use a separate supply. VPPF Program Supply Voltage. VPPF is both a Flash control input and a Flash power supply pin. The two functions are selected by the voltage range applied to the pin. If VPPF is kept in a low voltage range (0V to VDDQF) VPPF is seen as a control input. In this case a volt- age lower than VPPLKF gives an absolute protec- tion against program or erase, while VPPF > VPP1F enables these functions (see Tables 18 and 19, DC Characteristics for the relevant values). VPPF 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 VPPF is in the range of VPPHF it acts as a power supply pin. In this condition VPPF must be stable until the Program/Erase algorithm is completed. VSSF ,VSSQF and VSSS Grounds. VSSF, VSSQF and VSSS are the ground references for all voltage measurements in the Flash (core and I/O Buffers) and SRAM chips, respectively. Note: Each device in a system should have VDDF and VPPF decoupled with a 0.1µF ceramic capacitor close to the pin (high frequency, in- herently low inductance capacitors should be as close as possible to the package). See Fig- ure 10, AC Measurement Load Circuit. The PCB trace widths should be sufficient to carry the required VPPF program and erase currents. |
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