HT1621D View Datasheet(PDF) - Holtek Semiconductor
Part Name
Description
Manufacturer
HT1621D Datasheet PDF : 20 Pages
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A.C. Characteristics
Symbol
Parameter
fSYS1 System Clock
Test Conditions
VDD
Conditions
¾ On-chip RC oscillator
fSYS2 System Clock
¾ Crystal oscillator
fSYS3 System Clock
¾ External clock source
¾ On-chip RC oscillator
fLCD LCD Clock
¾ Crystal oscillator
¾ External clock source
tCOM LCD Common Period
¾ n: Number of COM
fCLK1 Serial Data Clock (WR pin)
3V
Duty cycle 50%
5V
fCLK2 Serial Data Clock (RD pin)
3V
Duty cycle 50%
5V
fTONE Tone Frequency
¾ On-chip RC oscillator
tCS
Serial Interface Reset Pulse
Width (Figure 3)
¾ CS
tCLK
WR, RD Input Pulse Width
(Figure 1)
Write mode
3V
Read mode
Write mode
5V
Read mode
tr, tf
Rise/Fall Time Serial Data
Clock Width (Figure 1)
¾
¾
tsu
Setup Time for DATA to WR,
RD Clock Width (Figure 2)
¾
¾
th
Hold Time for DATA to WR, RD
Clock Width (Figure 2)
¾
¾
tsu1
Setup Time for CS to WR, RD
Clock Width (Figure 3)
¾
¾
th1
Hold Time for CS to WR, RD
Clock Width (Figure 3)
¾
¾
HT1621
Ta=25°C
Min. Typ. Max. Unit
¾
256
¾ kHz
¾
32.768
¾ kHz
¾
256
¾ kHz
¾ fSYS1/1024 ¾
Hz
¾ fSYS2/128 ¾
Hz
¾ fSYS3/1024 ¾ Hz
¾
n/fLCD
¾
s
¾
¾
150 kHz
¾
¾
300 kHz
¾
¾
75 kHz
¾
¾
150 kHz
¾ 2.0 or 4.0 ¾ kHz
¾
250
¾ ns
3.34
¾
6.67
¾
1.67
¾
3.34
¾
¾
ms
¾
¾
ms
¾
¾
120
¾ ns
¾
120
¾ ns
¾
120
¾ ns
¾
100
¾ ns
¾
100
¾ ns
W R ,R D
C lo c k
90%
50%
10%
tf
tr
tC L K
tC L K
Figure 1
CS
W R ,R D
C lo c k
tC S
50%
tS U 1
th 1
50%
F ir s t C lo c k
L a s t C lo c k
Figure 3
Rev. 1.30
V DD
DB
GND
W R ,R D
C lo c k
V DD
GND
V DD
GND
6
V a lid D a ta
V DD
50%
GND
tS U
th
V DD
50%
GND
Figure 2
August 6, 2003
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