M27C405-100B6TR STMICROELECTRONICS [STMicroelectronics], M27C405-100B6TR Datasheet - Page 10

• Manufacturer Part Number: M27C405-100B6TR
• Description: 4 Mbit 512Kb x 8 OTP EPROM
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M27C405
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 V
”W” pin of the M29F040.The M27C405V
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 V
mode, is set to V
Changes to PRESTO II. The duration of the pro-
gramming pulse is reduced to 20 s, making the
programming time of the M27C405 comparable
with the counterpart FLASH Memory.
10/15
PP
pin of the M27C405 corresponds to the
PP
CC
input,when not in programming
or V
SS
.
PP
pin can
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 the25 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 V
sequenced from the device outputs by toggling
address line A0 from V
lines must be held at V
ture mode. Byte 0 (A0=V
facturer code and byte 1 (A0=V
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.
PP
=V
CC
=5V. Two identifierbytes may then be
IL
IL
IL
to V
during Electronic Signa-
) represents the manu-
IH
. All other address
IH
) the device