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M27C405-80K6TR Datasheet(PDF) 10 Page - STMicroelectronics

No. de pieza M27C405-80K6TR
Descripción Electrónicos  4 Mbit (512Kb x 8) OTP EPROM
Download  15 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M27C405-80K6TR Datasheet(HTML) 10 Page - STMicroelectronics

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Warning: compatibility with FLASH Memory
Compatibility issues may arise when replacing the
compatible Single Supply 4 Megabit FLASH Mem-
ory (the M29F040) by the M27C405.
The VPP pin of the M27C405 corresponds to the
”W” pin of the M29F040. The M27C405 VPP pin can
withstand voltages up to 12.75V, while the ”W” pin
of the M29F040 is a normal control signal input and
may be damaged if a high voltage is applied;
special precautions must be taken when program-
ming in-circuit.
However if an already programmed M27C405 is
used, this can be directly put in place of the FLASH
Memoryas the VPP input,when not in programming
mode, is set to VCC or VSS.
Changes to PRESTO II. The duration of the pro-
gramming pulse is reduced to 20
µs, making the
programming time of the M27C405 comparable
with the counterpart FLASH Memory.
Electronic Signature
The Electronic Signature (ES) mode allows the
reading out of a binary code from an OTP EPROM
that will identify its manufacturer and type. this
mode is intended for use by programming equip-
ment to automatically match the device to be pro-
grammed with its corresponding programming
algorithm. This mode is functionalin the 25
°C ± 5°C
ambient temperature range that is required when
programming the M27C405. To activate the ES
mode, the programming equipment must force
11.5V to 12.5V on address line A9 of the M27C405
with VPP=VCC=5V. Two identifierbytes may then be
sequenced from the device outputs by toggling
address line A0 from VIL to VIH. All other address
lines must be held at VIL during Electronic Signa-
ture mode. Byte 0 (A0=VIL) represents the manu-
facturer code and byte 1 (A0=VIH) the device
identifier code. For the STMicroelectronics
M27C405, these two identifier bytes are given in
Table 4 and can be read-out on outputs Q0 to Q7.
10/15
M27C405


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