M27W256(2006) 데이터 시트보기 (PDF) - STMicroelectronics
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M27W256 Datasheet PDF : 23 Pages
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Device description
M27W256
Figure 5. Programming flowchart
VCC = 6.25V, VPP = 12.75V
n=0
P = 100µs Pulse
NO
++n
= 25
NO
VERIFY
++ Addr
YES
YES
te Producctt((ss)) FAIL
Last NO
Addr
YES
CHECK ALL WORDS
1st: VCC = 5V
2nd: VCC = 2.7V
AI00707D
bsole Produ 2.7
Program Inhibit
- O te Programming of multiple M27W256s in parallel with different data is also easily
) le accomplished. Except for E, all like inputs including G of the parallel M27W256 may be
t(s o common. A TTL low level pulse applied to a M27W256's E input, with VPP at 12.75 V, will
s program that M27W256. A high level E input inhibits the other M27W256s from being
c b programmed.
Produ t(s) - O 2.8
Program Verify
te c A verify (read) should be performed on the programmed bits to determine that they were
le du correctly programmed. The verify is accomplished with G at VIL, E at VIH, VPP at 12.75V and
so ro VCC at 6.25V.
Ob te P 2.9
Electronic Signature
oleThe Electronic Signature (ES) mode allows the reading out of a binary code from an
s EPROM that will identify its manufacturer and type. This mode is intended for use by
b programming equipment to automatically match the device to be programmed with its
O corresponding programming algorithm. The ES mode is functional in the 25°C ± 5°C
ambient temperature range that is required when programming the M27W256. To activate
the ES mode, the programming equipment must force 11.5V to 12.5V on address line A9 of
the M27W256, with VCC = VPP = 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 M27W256,
10/23
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