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M2764A View Datasheet(PDF) - STMicroelectronics

Part Name
Description
View to exact match
M2764A
ST-Microelectronics
STMicroelectronics ST-Microelectronics
M2764A Datasheet PDF : 10 Pages
1 2 3 4 5 6 7 8 9 10
M2764A
Figure 6. Programming and Verify Modes AC Waveforms
A0-A12
Q0-Q7
VPP
VCC
E
P
G
tAVPL
DATA IN
tQVPL
tVPHPL
tVCHPL
tELPL
tPLPH
VALID
tPHQX
DATA OUT
tGLQV
tQXGL
PROGRAM
VERIFY
tGHQZ
tGHAX
AI00779
Figure 7. Fast Programming Flowchart
VCC = 6V, VPP = 12.5V
n=1
NO
++n
> 25
YES
FAIL
P = 1ms Pulse
NO
VERIFY
++ Addr
YES
P = 3ms Pulse by n
Last NO
Addr
YES
CHECK ALL BYTES
VCC = 5V, VPP 5V
AI00775B
DEVICE OPERATION (cont’d)
been successfully programmed. A flowchart of the
M2764A Fast Programming Algorithm is shown on
the last page. The Fast Programming Algorithm
utilizes two different pulse types: initial and over-
program.
The duration of the initial P pulse(s) is 1ms, which
will then be followed by a longer overprogram pulse
of length 3ms by n (n is equal to the number of the
initial one millisecond pulses applied to a particular
M2764A location), before a correct verify occurs.
Up to 25 one-millisecond pulses per byte are pro-
vided for before the overprogram pulse is applied.
The entire sequence of program pulses and byte
verifications is performed at VCC = 6V and VPP =
12.5V. When the Fast Programming cycle has been
completed, all bytes should be compared to the
original data with VCC = 5V and VPP = 5V.
Program Inhibit
Programming of multiple M2764A in parallel with
different data is also easily accomplished. Except
for E, all like inputs (including G) of the parallel
M2764A may be common. A TTL low pulse applied
to a M2764A’s E input, with VPP at 12.5V, will
program that M2764A. A high level E input inhibits
the other M2764As from being programmed.
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