HT1622
A.C. Characteristics
Symbol
f
SYS1
System Clock
Parameter
Test Conditions
V
DD
3V
5V
f
SYS2
f
LCD1
f
LCD2
t
COM
f
CLK1
f
CLK2
t
CS
System Clock
LCD Frame Frequency
LCD Frame Frequency
LCD Common Period
Serial Data Clock (WR pin)
3V
5V
3V
5V
3V
5V
¾
3V
5V
3V
5V
¾
3V
t
CLK
WR, RD Input Pulse Width (Figure 1)
5V
t
r
, t
f
t
su
t
h
t
su1
t
h1
Rise/Fall Time Serial Data Clock Width
(Figure 1)
Setup Time for DATA to WR, RD Clock
Width (Figure 2)
Hold Time for DATA to WR, RD, Clock
Width (Figure 2)
Setup Time for CS to WR, RD Clock
Width (Figure 3)
Hold Time for CS to WR, RD Clock
Width (Figure 3)
3V
5V
3V
5V
3V
5V
3V
5V
3V
5V
External clock source
On-chip RC oscillator
External clock source
n: Number of COM
Duty cycle 50%
Conditions
On-chip RC oscillator
Min.
22
24
¾
¾
44
48
¾
¾
¾
¾
¾
¾
¾
¾
3.34
6.67
1.67
3.34
¾
¾
¾
¾
¾
Typ.
32
32
32
32
64
64
64
64
n/f
LCD
¾
¾
¾
¾
250
¾
¾
¾
¾
120
120
120
100
100
Ta=25°C
Max.
40
40
¾
¾
80
80
¾
¾
¾
150
300
75
150
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
Unit
kHz
kHz
kHz
kHz
Hz
Hz
¾
¾
sec
kHz
kHz
kHz
kHz
ns
ms
ms
ns
ns
ns
ns
ns
Serial Data Clock (RD pin)
Serial Interface Reset Pulse Width
(Figure 3)
Duty cycle 50%
CS
Write mode
Read mode
Write mode
Read mode
¾
¾
¾
¾
¾
t
f
W R , R D
C lo c k
9 0 %
5 0 %
1 0 %
t
C
t
r
V
t
C
L K
D D
V A L ID D A T A
D B
5 0 %
t
su
W R , R D
C lo c k
5 0 %
t
h
V
V
D D
G N D
G N D
D D
L K
Figure 1
t
C
S
G N D
Figure 2
V
D D
C S
5 0 %
t
su
1
t
h
1
G N D
V
D D
W R , R D
C lo c k
5 0 %
F IR S T
C lo c k
L A S T
C lo c k
G N D
Figure 3
Rev. 1.40
5
February 6, 2007
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
