AT27LV520-90 ATMEL Corporation, AT27LV520-90 Datasheet - Page 8

• Manufacturer Part Number: AT27LV520-90
• Description: 512K 64K x 8 Multiplexed Addresses/ Outputs Low Voltage OTP EPROM
• Manufacturer: ATMEL Corporation

Rapid
A 50 s ALE pulse width is used to program. The address
is set to the first location. V
is raised to 13.0V. Each address is first programmed with
one 50 s ALE pulse without verification. Then a verifica-
tion/reprogramming loop is executed for each address. In
the event a byte fails to pass verification, up to 10 succes-
sive 50 s pulses are applied with a verification after each
8
™
Programming Algorithm
AT27LV520
CC
is raised to 6.5V and OE/V
INCREMENT
INCREMENT
YES
ADDRESS
ADDRESS
NO
ADDR.?
LAST
PROGRAM ONE 50 S PULSE
PROGRAM ONE 100 S PULSE
ADDR = FIRST LOCATION
ADDR = FIRST LOCATION
PASS
NO
PP
TO ORIGINAL
PASS
V = 5.0V
V = 5.0V
V
V
ALL BYTES
CC
COMPARE
PP
CC
PASSED
PP
DEVICE
VERIFY
ADDR.?
START
LAST
BYTE
DATA
X = 0
= 6.5V
= 13.0V
YES
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. OE/V
All bytes are read again and compared with the original
data to determine if the device passes or fails.
FAIL
FAIL
INCREMENT X
NO
PP
DEVICE
FAILED
X = 10?
is then lowered to V
YES
IH
and V
CC
to 5.0V.