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M27C64A-20F1X Datenblatt(PDF) 7 Page - STMicroelectronics

Teilenummer M27C64A-20F1X
Bauteilbeschribung  64K (8K x 8) UV EPROM and OTP ROM
Download  11 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M27C64A-20F1X Datenblatt(HTML) 7 Page - STMicroelectronics

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tAVPL
VALID
AI00779
A0-A12
Q0-Q7
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
AI01167
n= 1
Last
Addr
VERIFY
P = 1ms Pulse
++n
>25
++ Addr
VCC = 6V, VPP = 12.5V
FAIL
CHECK ALL BYTES
1st: VCC =6V
2nd: VCC = 4.2V
YES
NO
YES
NO
YES
NO
P = 3ms Pulse by n
Figure 7. Programming Flowchart
Programming
When delivered (and after each erasure for UV
EPROM), all bits of the M27C64A are in the “1”
state. Data is introduced by selectively program-
ming ”0s” into the desired bit locations. Although
only “0s” will be programmed, both “1s” and “0s”
can be present in the data word. The only way to
change a “0” to a ”1” is by die exposition to ultra-
violet light (UV EPROM). The M27C64A is in the
programming mode when Vpp input is at 12.5V, and
E and P are at TTL-low. The data to be programmed
is applied 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 6V
± 0.25V.
High Speed Programming
The high speed programming algorithm, described
in the flowchart, rapidly programs the M27C64A
using an efficient and reliable method, particularly
suited to the production programming environ-
ment. An individual device will take around1 minute
to program.
Program Inhibit
Programming of multiple M27C64A in parallel with
different data is also easily accomplished. Except
for E, all like inputs including G of the parallel
M27C64A may be common. A TTL low level pulse
applied to a M27C64A E input, with P low and VPP
7/11
M27C64A


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