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M27C405-80N6TR Datasheet(PDF) 8 Page - STMicroelectronics

No. de pieza M27C405-80N6TR
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

M27C405-80N6TR Datasheet(HTML) 8 Page - STMicroelectronics

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tAVPL
VALID
AI00725
A0-A18
Q0-Q7
VPP
VCC
G
DATA IN
DATA OUT
E
tQVEL
tVPHEL
tVCHEL
tEHQX
tELEH
tGLQV
tQXGL
tGHQZ
tGHAX
PROGRAM
VERIFY
Figure 6. Programming and Verify Modes AC Waveforms
System Considerations
The power switching characteristics of Advanced
CMOS OTP EPROMs require careful decoupling of
the devices. The supply current, ICC, has three
segments that are of interest to the system de-
signer : the standby current level, the active current
level, and transient current peaks that are pro-
duced by the falling and rising edges of E. The
magnitude of the transient current peaks is de-
pendent on the capacitive and inductive loading of
the device at the output.
The associated transient voltage peaks can be
suppressed by complying with the two line output
control and by properly selected decoupling ca-
pacitors. It is recommended that a 0.1
µF ceramic
capacitor be used on every device between VCC
and VSS. This should be a high frequency capacitor
of low inherent inductance and should be placed
as close to the device as possible. In addition, a
4.7
µF bulk electrolytic capacitor should be used
between VCC and VSS for every eight devices. The
bulk capacitor should be located near the power
supply connection point.The purpose of the bulk
capacitor is to overcome the voltage drop caused
by the inductive effects of PCB traces.
Programming
When delivered, all bits of the M27C405 are in the
’1’ state. Data is introducedby selectively program-
ming ’0’s into the desired bit locations. Although
only ’0’s will be programmed, both ’1’s and ’0’s can
be present in the data word. The M27C405 is in
the programming mode when VPP input is at
12.75V,G is at VIH and E is pulsed to VIL. The data
to be programmed is applied to 8 bits in parallel to
the data output pins. The levels required for the
address and data inputs are TTL. VCC is specified
to be 6.25V
± 0.25V.
8/15
M27C405


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