AT27BV4096-12JU 데이터 시트보기 (PDF) - Atmel Corporation

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AT27BV4096-12JU

4-Megabit (256K x 16) Unregulated Battery-Voltage High-Speed OTP EPROM

Atmel Corporation 

18. Rapid Programming Algorithm

A 50 µs 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 50 µs CE pulse

without verification. Then a verification/reprogramming loop is executed for each address. In the

event a word fails to pass verification, up to 10 successive 50 µs pulses are applied with a verifi-

cation after each pulse. If the word fails to verify after 10 pulses have been applied, the part is

considered failed. After the word 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 words are read again and com-

pared with the original data to determine if the device passes or fails.

10 AT27BV4096

START

ADDR = FIRST LOCATION

VCC = 6.5V

VPP = 13.0V

PROGRAM ONE 50 µS PULSE

INCREMENT ADDRESS NO

LAST

ADDR.?

YES

ADDR = FIRST LOCATION

INCREMENT ADDRESS

NO

LAST

ADDR.?

PASS

X=0

VERIFY

WORD

FAIL

YES

PROGRAM ONE 50 µS PULSE

INCREMENT X

NO

X = 10?

VCC = 5.0V

VPP = 5.0V

YES

COMPARE

ALL WORDS

TO ORIGINAL

DATA

PASS

DEVICE

PASSED

FAIL

DEVICE

FAILED

0640D–EPROM–10/05

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