M50FLW040B 查看數據表（PDF） - STMicroelectronics
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M50FLW040B
STMicroelectronics
M50FLW040B Datasheet PDF : 64 Pages
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Signal descriptions
M50FLW040A, M50FLW040B
2.2.6
Ready/Busy output (RB)
The Ready/Busy pin gives the status of the device’s Program/Erase Controller. When
Ready/Busy is Low, VOL, the device is busy with a program or erase operation, and it will not
accept any additional program or erase command (except for the Program/Erase Suspend
command). When Ready/Busy is High, VOH, the memory is ready for any read, program or
erase operation.
2.3
2.3.1
2.3.2
2.3.3
Supply signal descriptions
The Supply Signals are the same for both interfaces.
VCC supply voltage
The VCC Supply Voltage supplies the power for all operations (read, program, erase, etc.).
The Command Interface is disabled when the VCC Supply Voltage is less than the Lockout
Voltage, VLKO. This is to prevent Bus Write operations from accidentally damaging the data
during power up, power down and power surges. If the Program/Erase Controller is
programming or erasing during this time, the operation aborts, and the memory contents
that were being altered will be invalid. After VCC becomes valid, the Command Interface is
reset to Read mode.
A 0.1µF capacitor should be connected between the VCC Supply Voltage pins and the VSS
Ground pin to decouple the current surges from the power supply. Both VCC Supply Voltage
pins must be connected to the power supply. The PCB track widths must be sufficient to
carry the currents required during program and erase operations.
VPP optional supply voltage
The VPP Optional Supply Voltage pin is used to select the Fast Program (see the Quadruple
Byte Program command description in A/A Mux interface and the Double/Quadruple Byte
Program command description in FWH mode) and Fast Erase options of the memory.
When VPP = VCC, program and erase operations take place as normal. When VPP = VPPH,
Fast Program and Erase operations are used. Any other voltage input to VPP will result in
undefined behavior, and should not be used.
VPP should not be set to VPPH for more than 80 hours during the life of the memory.
VSS ground
VSS is the reference for all the voltage measurements.
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