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M27W201 датащи(PDF) 10 Page - STMicroelectronics

номер детали M27W201
подробное описание детали  2 Mbit (256Kb x 8) Low Voltage UV EPROM and OTP EPROM
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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Device Description
M27W201
10/24
2.6
Presto II programming algorithm
Presto II Programming Algorithm allows the whole array to be programmed with a
guaranteed margin, in a typical time of 26.5 seconds. Programming with Presto II consists of
applying a sequence of 100µs program pulses to each byte until a correct verify occurs (see
Figure 5). During programming and verify operation, a Margin mode circuit is automatically
activated in order to guarantee that each cell is programmed with enough margin. No
overprogram pulse is applied since the verify in Margin mode at VCC much higher than 3.6V,
provides the necessary margin to each programmed cell.
Figure 5.
Programming flowchart
2.7
Program Inhibit
Programming of multiple M27W201s in parallel with different data is also easily
accomplished. Except for E, all like inputs including G of the parallel M27W201 may be
common. A TTL low level pulse applied to a M27W201's P input, with E low and VPP at
12.75V, will program that M27W201. A high level E input inhibits the other M27W201s from
being programmed.
2.8
Program Verify
A verify (read) should be performed on the programmed bits to determine that they were
correctly programmed. The verify is accomplished with E and G at VIL, P at VIH, VPP at
12.75V and VCC at 6.25V.
AI00715D
n = 0
Last
Addr
VERIFY
P = 100
µs Pulse
++n
= 25
++ Addr
VCC = 6.25V, VPP = 12.75V
FAIL
CHECK ALL BYTES
1st: VCC = 5V
2nd: VCC = 2.7V
YES
NO
YES
NO
YES
NO


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