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M27256F1 View Datasheet(PDF) - STMicroelectronics

Part Name
Description
Manufacturer
M27256F1
ST-Microelectronics
STMicroelectronics ST-Microelectronics
M27256F1 Datasheet PDF : 10 Pages
1 2 3 4 5 6 7 8 9 10
Figure 6. Programming and Verify Modes AC Waveforms
M27256
A0-A14
Q0-Q7
VPP
VCC
E
G
tAVEL
DATA IN
tQVEL
tVPHEL
tVCHEL
tELEH
VALID
tEHQX
DATA OUT
tGLQV
tQXGL
tGHQZ
tGHAX
PROGRAM
VERIFY
AI00759
Figure 7. Programming Flowchart
VCC = 6V, VPP = 12.5V
n=1
NO
++n
> 25
YES
FAIL
E = 1ms Pulse
NO
VERIFY
++ Addr
YES
E = 3ms Pulse by n
Last NO
Addr
YES
CHECK ALL BYTES
VCC = 5V, VPP = 5V
AI00774B
DEVICE OPERATION (cont’d)
to a particular M27256 location), before a correct
verify occurs. Up to 25 one-millisecond pulses per
byte are provided for before the over program 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 com-
pleted, all bytes should be compared to the original
data with VCC = 5V and VPP = 5V.
Program Inhibit
Programming of multiple M27256s in parallel with
different data is also easily accomplished. Except
for E, all like inputs (including G) of the parallel
M27256 may be common. A TTL low pulse applied
to a M27256’s E input, with VPP = 12.5V, will
program that M27256. A high level E input inhibits
the other M27256s from being programmed.
Program Verify
A verify should be performed on the programmed
bits to determine that they were correctly pro-
grammed. The verify is accomplished with E = VIH,
G = VIL and VPP = 12.5V.
Optional Verify
The optional verify may be performed instead of the
verify mode. It is performed with G = VIL, E = VIL
(as opposed t the standard verify which has E =
7/10
 

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