HT1620 Datasheet, PDF (8/17 Pages) Holtek Semiconductor Inc – RAM Mapping 32x4 LCD Controller for I/O C

HT1620
Symbol
Parameter
Test Conditions
V_DD Conditions
t_CS
Serial Interface Reset Pulse
Width
(Figure 3)
¾
CS
t_CLK
WR, RD Input Pulse Width
(Figure 1)
3V
Write mode
Read mode
t_r, t_f
Rise/Fall Time Serial Data Clock
Width
(Figure 1)
3V
¾
t_su
Setup Time for DATA to WR, RD
Clock Width
(Figure 2)
3V
¾
t_h
Hold Time for DATA to WR, RD
Clock Width
(Figure 2)
3V
¾
t_su1
Setup Time for CS to WR,RD
Clock Width
(Figure 3)
3V
¾
t_h1
Hold Time for CS to WR, RD Clock
Width
(Figure 3)
3V
¾
Min. Typ. Max. Unit
¾ 250 ¾ ns
3.34 ¾
6.67 ¾
¾
ms
¾
¾ 120 ¾ ns
¾ 120 ¾ ns
¾ 120 ¾ ns
¾ 100 ¾ ns
¾ 100 ¾ ns
V A L ID D A T A
V DD
DB
50%
tf
tr
W R ,R D 90%
V DD
GND
ts u
th
C lo c k
50%
10%
tC L K
tC L K
G N D _{W R ,R D}
C lo c k
V DD
50%
GND
Figure 1
Figure 2
CS
W R ,R D
C lo c k
50%
tsu 1
50%
F IR S T
C lo c k
tC S
V DD
GND
th 1
V DD
LA S T
GND
C lo c k
Figure 3
8
July 26, 1999