m27c4002 STMicroelectronics, m27c4002 Datasheet - Page 10

• Manufacturer Part Number: m27c4002
• Description: 4 Mbit 256kb X16 Uv Eprom And Otp Eprom
• Manufacturer: STMicroelectronics

Device operation
2.7
2.8
2.9
10/24
Figure 5.
Program Inhibit
Programming of multiple M27C4002 devices in parallel with different data is also easily
accomplished. Except for E, all like inputs including G of the parallel M27C4002 may be
common. A TTL low level pulse applied to a M27C4002 E input, with V
program that M27C4002. A high level E input inhibits the other M27C4002 devices from
being programmed.
Program Verify
A verify (read) should be performed on the programmed bits to determine that they were
correctly programmed. The verify is accomplished with G at V
V
Electronic Signature
The Electronic Signature (ES) mode allows the reading out of a binary code from an
EPROM that will identify its manufacturer and type. This mode is intended for use by
programming equipment to automatically match the device to be programmed with its
corresponding programming algorithm. The ES mode is functional in the 25°C ± 5°C
ambient temperature range that is required when programming the M27C4002. To activate
the ES mode, the programming equipment must force 11.5V to 12.5V on address line A9 of
the M27C4002 with V
device outputs by toggling address line A0 from V
held at V
code and byte 1 (A0 = V
CC
at 6.25V.
IL
during Electronic Signature mode. Byte 0 (A0 = V
Programming Flowchart
PP
IH
= V
) the device identifier code. For the STMicroelectronics
YES
NO
CC
FAIL
= 25
++n
= 5V. Two identifier bytes may then be sequenced from the
V CC = 6.25V, V PP = 12.75V
CHECK ALL WORDS
NO
2nd: V CC = 4.2V
E = 100 s Pulse
1st: V CC = 6V
VERIFY
n = 0
Addr
Last
YES
YES
NO
IL
to V
++ Addr
IH
. All other address lines must be
AI00726C
IL
IL
) represents the manufacturer
, E at V
IH
PP
, V
at 12.75V, will
PP
at 12.75V and
M27C4002