AT27C020-15PI データシートの表示（PDF） - Atmel Corporation

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AT27C020-15PI

2-Megabit (256K x 8) OTP EPROM

Atmel Corporation 

Rapid Programming Algorithm

A 100 µs PGM pulse width is used to program. The

address is set to the first location. VCC is raised to 6.5V and

VPP is raised to 13.0V. Each address is first programmed

with one 100 µs PGM pulse without verification. Then a

verification / reprogramming loop is executed for each

address. In the event a byte fails to pass verification, up to

10 successive 100 µs pulses are applied with a verification

after each pulse. If the byte fails to verify after 10 pulses

have been applied, the part is considered failed. After the

byte verifies properly, the next address is selected until all

have been checked. VPP is then lowered to 5.0V and VCC to

5.0V. All bytes are read again and compared with the origi-

nal data to determine if the device passes or fails.

8

AT27C020

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