HN27C4000G Datasheet, PDF (9/20 Pages) Hitachi Semiconductor – 524288-Word ®8-Bit/262144-Word X 16-Bit CMOS UV Erasable and Programmable ROM

HN27C4000G Series
Fast High-Reliability Page
Programming
This device can be applied the high performance
page 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.
Page Program Set
Apply 12 V to OE pin after applying 12.5 V to V_PP
to set a page program mode.
The device operates in a page program mode until
reset.
Page Program Reset
Set V_PP to V_CC level or less to reset a page
program mode.
START
SET PAGE PROG LATCH MODE
V_PP=
12.5_O±_E0=.31V2.0V_C±C
= 6.25
0.5 V
±
0.25
V
Address = 0
n=0
Latch
Address + 1→Address
Latch
Address + 1→Address
Latch
Address + 1→Address
Latch
n + 1 →n
SET PAGE PROG./VERIFY MODE
VPP = 12.5 ± 0.3 V VCC = 6.25 ± 0.25 V
Address + 1→Address
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
Fast High-Reliability Page Programming Flowchart
n = 10? ^NO
YES
FAIL
9