HN27C4000G Datasheet, PDF (13/20 Pages) Hitachi Semiconductor – 524288-Word ®8-Bit/262144-Word X 16-Bit CMOS UV Erasable and Programmable ROM

HN27C4000G Series
Fast High-Reliability Programming
This device can be applied the fast high-reliability
programming algorithm shown in the following
flowchart. This algorithm allows to obtain faster
programming time without any voltage stress to the
device nor deterioration in reliability of
programmed data.
START
SET PROG./VERIFY MODE
V_PP = 12.5 ± 0.3 V V_CC = 6.25 ± 0.25 V
Address = 0
n=0
Address + 1 Address
n+1 n
Program t_PW = 50 µs ± 5%
VERIFY ^NOGO
GO
NO
LAST
address?
YES
SET READ MODE
V_CC = 5.0 ± 0.5 V V_PP = V_CC
READ
all address
GO
END
NOGO
n = 10? ^NO
YES
FAIL
Fast High-Reliability Programming Flowchart
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