AT27C256R-70JU Ver la hoja de datos (PDF) - Atmel Corporation

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AT27C256R-70JU

256K (32K x 8) One-time Programmable, Read-only Memory

Atmel Corporation 

6. Rapid programming algorithm

A 100µs CE 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 100µs CE 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 100µs 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 original data to determine if the device

passes or fails.

Figure 6-1. Rapid programming algorithm

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Atmel AT27C256R

0014O–EPROM–10/11

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