M27V102-200K1TR datasheet(8/15 Pages) STMICROELECTRONICS

Part #	M27V102-200K1TR

Description	1 Mbit (64Kb x 16) Low Voltage UV EPROM and OTP EPROM

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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8 / 15 page

tAVPL

VALID

AI00706

A0-A15

Q0-Q15

VPP

VCC

P

G

DATA IN

DATA OUT

E

tQVPL

tVPHPL

tVCHPL

tPHQX

tPLPH

tGLQV

tQXGL

tELPL

tGHQZ

tGHAX

PROGRAM

VERIFY

Figure 6. Programming and Verify Modes AC Waveforms

PRESTO II Programming Algorithm

PRESTO II Programming Algorithm allows pro-

gramming of the whole array with a guaranteed

margin, in a typical time of 6.5 seconds. Program-

ming with PRESTO II consists of applying a se-

quenceof 100

µs programpulses toeach worduntil

a correct verify occurs (see Figure 7). During pro-

gramming and verify operation, a MARGIN MODE

circuit is automaticallyactivated in order to guaran-

tee 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 necessary margin to each pro-

grammed cell.

Program Inhibit

Programming of multiple M27V102s in parallel with

different data is also easily accomplished. Except

for E, all like inputs including G of the parallel

M27V102 may be common. A TTL low level pulse

applied to a M27V102’sP input, with E low and VPP

at 12.75V, will program that M27V102. A high level

E input inhibits the other M27V102s from being

programmed.

Program Verify

A verify (read) should be performed on the pro-

grammed bits to determine that they were correctly

programmed. The verify is accomplished with E

AI00707C

n= 0

Last

Addr

VERIFY

P = 100

µs Pulse

++n

=25

++ Addr

VCC = 6.25V, VPP = 12.75V

FAIL

CHECK ALL WORDS

1st: VCC =6V

2nd: VCC = 4.2V

YES

NO

YES

NO

YES

NO

Figure 7. Programming Flowchart

8/15

M27V102

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M27V102-200K1TR Datasheet(PDF) 8 Page - STMicroelectronics

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