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M27C64A-15F1 Datasheet(PDF) 9 Page - STMicroelectronics

No. de pieza M27C64A-15F1
Descripción Electrónicos  64 Kbit (8Kb x8) UV EPROM and OTP EPROM
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M27C64A-15F1 Datasheet(HTML) 9 Page - STMicroelectronics

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M27C64A
Device operation
9/22
be a high frequency capacitor of low inherent inductance and should be placed as close to
the device as possible. In addition, a 4.7µF 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.
2.5
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 programming "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 only way to change a "0" to a "1" is by die exposition to ultraviolet light (UV EPROM).
The M27C64A is in the programming mode when VPP input is at 12.5V, E is at VIL and P 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 6V
± 0.25V.
2.6
High-speed programming
The high speed programming algorithm, described in Figure 4, rapidly programs the
M27C64A using an efficient and reliable method, particularly suited to the production
programming environment. An individual device will take around 1 minute to program.
Figure 4.
Programming Flowchart
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


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