HT27LC020
P ro g ra m
A d d re s s
V
V
V
V
6 .0 V
5 .0 V
1 2 .5 V
5 .0 V
t
P
V
V
V
V
IH
IL
R T
IH
IL
R e a d
( V e r ify )
A d d r e s s S ta b le
t
A
S
t
O
E
t
A
H
D a ta
IH
IL
D a ta In
t
D
S
D a ta O u t
V a lid
t
D
H
V C C
t
D
t
V
t
V
C S
P S
. P
V P P
C E
t
C
P G M
IH
IL
E S
t
P
W
t
O
E S
O E
V
V
IH
IL
Figure 2. Programming Waveforms
S T A R T
A d d r e s s = . ir s t L o c a tio n
V
V
C C
P P
= 6 .0 V
= 1 2 .5 V
X = 0
In te r a c tiv e
S e c tio n
P ro g ra m
o n e 7 5
s P u ls e
In c re m e n t X
X = 2 5 ?
N o
. a il
V e r ify
B y te ?
P a s s
In c re m e n t A d d re s s
N o
L a s t
A d d re s s
Y e s
V
V e r ify
S e c tio n
C C
Y e s
. a il
= V
P P
= 3 .3 V
V e r ify a ll
B y te s ?
P a s s
D e v ic e P a s s e d
. a il
D e v ic e . a ile d
N o te : E ith e r 1 0 5
s o r 3 0
s p u ls e .
Figure 3. Fast Programming Flowchart
Rev. 1.50
7
December 8, 2003
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
