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M50LPW040 Datasheet(PDF) 6 Page - STMicroelectronics

Part No. M50LPW040
Description  4 Mbit 512Kb x8, Uniform Block 3V Supply Low Pin Count Flash Memory
Download  36 Pages
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com

M50LPW040 Datasheet(HTML) 6 Page - STMicroelectronics

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Supply Signal Descriptions
The Supply Signals are the same for both interfac-
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
accidentally 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
memory contents 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) and Fast Erase options of
the memory and to protect the memory. When VPP
< VPPLK Program and Erase operations cannot be
performed and an error is reported in the Status
Register if an attempt to change the memory
contents is made. When VPP = VCC Program and
Erase operations take place as normal. When
VPP = VPPH Fast Program (if a Quadruple Byte
Program Command is performed) and Fast 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 volt-
age measurements.
The two interfaces have similar bus operations but
the signals and timings are completely different.
The Low Pin Count (LPC) Interface is the usual
interface and all of the functionality of the part is
available through this interface. Only a subset of
functions are available through the Address/
Address Multiplexed (A/A Mux) Interface.
Follow the section Low Pin Count (LPC) Bus
Operations below and the section Address/
Address Multiplexed (A/A Mux) Interface Bus
Operations below for a description of the bus
operations on each interface.
Low Pin Count (LPC) Bus Operations
The Low Pin Count (LPC) Interface consists of
four data signals (LAD0-LAD3), one control line
protection against accidental or malicious data
corruption can be achieved using two further
signals (TBL and WP). Finally two reset signals
(RP and INIT) are available to put the memory into
a known state.
The data signals, control signal and clock are
designed to be compatible with PCI electrical
specifications. The interface operates with clock
speeds up to 33MHz.
The following operations can be performed using
the appropriate bus cycles: Bus Read, Bus Write,
Standby, Reset and Block Protection.
Table 4. Absolute Maximum Ratings (1)
Note: 1. Except for the rating "Operating Temperature Range", stresses above those listed in the Table "Absolute Maximum Ratings" may
cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions
above those indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating condi-
tions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant qual-
ity documents.
2. Minimum Voltage may undershoot to -2V and for less than 20ns during transitions. Maximum Voltage may overshoot to VCC +2V
and for less than 20ns during transitions.
Ambient Operating Temperature (Temperature Range Option 1)
0 to 70
Ambient Operating Temperature (Temperature Range Option 5)
–20 to 85
Temperature Under Bias
–50 to 125
Storage Temperature
–65 to 150
Input or Output Voltage
–0.6 to VCC + 0.6
Supply Voltage
–0.6 to 4
Program Voltage
–0.6 to 13

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