M27W801_06 Datasheet, PDF (10/24 Pages) STMicroelectronics – 8 Mbit 1Mb x8 Low Voltage UV EPROM and OTP EPROM

Device operation
Figure 5. Programming flowchart
VCC = 6.25V, VPP = 12.75V
SET MARGIN MODE
n=0
NO
++n
= 25
YES
E = 50µs Pulse
NO
VERIFY
YES
++ Addr
FAIL
Last NO
Addr
YES
RESET MARGIN MODE
CHECK ALL BYTES
1st: VCC = 5V
2nd: VCC = 2.7V
AI01271C
M27W801
2.7
Program Inhibit
Programming of multiple M27W801s in parallel with different data is also easily
accomplished. Except for E, all like inputs including GV_PP of the parallel M27W801 may be
common. A TTL low level pulse applied to a M27W801's E input, with V_PP at 12.75V, will
program that M27W801. A high level E input inhibits the other M27W801s from being
programmed.
2.8
Program Verify
A verify (read) should be performed on the programmed bits to determine that they were
correctly programmed. The verify is accomplished with G at V_IL. Data should be verified with
t_ELQV after the falling edge of E.
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