HT1622
A.C. Characteristics
Symbol
f
SYS1
Parameter
System Clock
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)
Serial Data Clock (RD pin)
Serial Interface Reset Pulse
Width
(Figure 3)
3V
5V
3V
5V
3V
5V
¾
3V
5V
3V
5V
¾
3V
5V
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%
Duty cycle 50%
CS
Write mode
Read mode
Write mode
Read mode
¾
¾
¾
¾
¾
Conditions
On-chip RC oscillator
Ta=25°C
Min. Typ. Max. Unit
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
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
40
40
¾
¾
80
80
¾
¾
¾
150
300
75
150
¾
¾
¾
¾
¾
¾
¾
¾
¾
¾
kHz
kHz
kHz
kHz
Hz
Hz
¾
¾
sec
kHz
kHz
kHz
kHz
ns
ms
ms
ns
ns
ns
ns
ns
t
CLK
WR, RD Input Pulse Width
(Figure 1)
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)
7
April 21, 2000
HOLTEK [ HOLTEK SEMICONDUCTOR INC ]
