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M27C405-120N6TR Datasheet(PDF) 9 Page - STMicroelectronics

No. de pieza M27C405-120N6TR
Descripción Electrónicos  4 Mbit (512Kb x 8) OTP EPROM
Download  15 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M27C405-120N6TR Datasheet(HTML) 9 Page - STMicroelectronics

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AI00760B
n= 0
Last
Addr
VERIFY
E = 100
µs Pulse
++n
=25
++ Addr
VCC = 6.25V, VPP = 12.75V
FAIL
CHECK ALL BYTES
1st: VCC =6V
2nd: VCC = 4.2V
YES
NO
YES
NO
YES
NO
Figure 7. Programming Flowchart
PRESTO II Programming Algorithm
PRESTO II Programming Algorithm allows the
whole array to be programmed with a guaranteed
margin, in a typical time of 52.5 seconds.Program-
ming with PRESTO II consists of applying a se-
quence of 100
µs programpulses to each byte until
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 provides the necessary
margin to each programmed cell.
Program Inhibit
Programming of multiple M27C405s in parallel with
different data is also easily accomplished. Except
for E, all like inputs including G of the parallel
M27C405 may be common. A TTL low level pulse
appliedto a M27C405’sE input,with VPP at 12.75V,
will program that M27C405. A high level E input
inhibits the other M27C405s from being pro-
grammed.
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 G at
VIL , E at VIH,VPP at 12.75V and VCC at 6.25V.
On-Board Programming
Programming the M27C405 may be performed
directly in the application circuit, however this re-
quires modification to the PRESTO II Algorithm
(see Figure 8). For in-circuit programming VCC is
determined by the user and normally is compatible
with other components using the same supply volt-
age. It is recommended that the maximum value of
VCC which remains compatible with the circuit is
used.
Typically VCC=5.5V for programming systems us-
ing VCC=5V is recommended. The value of VCC
does not affect the programming, it gives a higher
test capability in VERIFY mode.
VPP must be kept at 12.75 volts to maintain and
enable the programming.
AI01349
n= 0
Last
Addr
VERIFY
?
E= 10
µs Pulse
++n
=25
++ Addr
VPP = 12.75V
FAIL
CHECK ALL BYTES
VPP =VCC
YES
NO
YES
NO
YES
NO
SET MARGIN MODE
E= 10
µs Pulse
Figure 8. On-Board Programming Flowchart
9/15
M27C405


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