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M29W102BT Datasheet(PDF) 4 Page - STMicroelectronics

Part No. M29W102BT
Description  1 Mbit 64Kb x16, Boot Block Low Voltage Single Supply Flash Memory
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M29W102BT Datasheet(HTML) 4 Page - STMicroelectronics

 
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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-A15). 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-DQ15). The Data In-
puts/Outputs output the data stored at the selected
address during a Bus Read operation. During Bus
Write operations DQ0-DQ7 represent the com-
mands sent to the Command Interface of the inter-
nal state machine; the Command Interface does
not use DQ8-DQ15 to decode the commands.
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.
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 10, 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, ICC3.
VSS Ground. The VSS Ground is the reference for
all voltage measurements.


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