M27C4002 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
M27C4002 Datasheet PDF : 24 Pages
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Device operation
M27C4002
Figure 5. Programming Flowchart
VCC = 6.25V, VPP = 12.75V
n=0
E = 100µs Pulse
NO
++n
= 25
NO
VERIFY
++ Addr
YES
YES
te Product(s) FAIL
Last NO
Addr
YES
CHECK ALL WORDS
1st: VCC = 6V
2nd: VCC = 4.2V
AI00726C
bsole 2.7
Program Inhibit
O 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
t(s) common. A TTL low level pulse applied to a M27C4002 E input, with VPP at 12.75V, will
program that M27C4002. A high level E input inhibits the other M27C4002 devices from
c being programmed.
Produ 2.8
Program Verify
teA verify (read) should be performed on the programmed bits to determine that they were
lecorrectly programmed. The verify is accomplished with G at VIL, E at VIH, VPP at 12.75V and
Obso VCC at 6.25V.
2.9
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 VPP = VCC = 5V. Two identifier bytes 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 Signature mode. Byte 0 (A0 = VIL) represents the manufacturer
code and byte 1 (A0 = VIH) the device identifier code. For the STMicroelectronics
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