HT1625_02 datasheet(7/15 Pages) HOLTEK

7 / 15 page

A.C. Characteristics

Ta=25

°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

fSYS1

System Clock

On-chip RC oscillator

kHz

fSYS2

System Clock

External clock source

kHz

fLCD1

LCD Frame Frequency

On-chip RC oscillator

fLCD2

LCD Frame Frequency

External clock source

tCOM

LCD Common Period

n: Number of COM

n/fLCD

sec

fCLK1

Serial Data Clock (WR Pin)

Duty cycle 50%

¾¾

150

kHz

¾¾

300

kHz

fCLK2

Serial Data Clock (RD Pin)

Duty cycle 50%

¾¾

kHz

¾¾

150

kHz

tCS

Serial Interface Reset Pulse Width

(Figure 3)

250

tCLK

WR,RD Input Pulse Width (Figure 1)

Write mode

3.34

¾¾

Read mode

6.67

¾¾

Write mode

1.67

¾¾

Read mode

3.34

¾¾

tr,tf

Rise or Fall Time Serial Data Clock

Width (Figure 1)

¾¾

120

tsu

Setup Time for DATA to WR,RD

Clock Width (Figure 2)

¾¾

120

Hold Time for DATA to WR,RD Clock

Width (Figure 2)

¾¾

120

tsu1

Setup Time for CS to WR,RD Clock

Width (Figure 3)

¾¾

100

th1

Hold Time for CS to WR,RD Clock

Width (Figure 3)

¾¾

100

HT1625

Rev. 1.10

September 11, 2002

5 0 %

V A L I D D A T A

5 0 %

D B

W R , R D

C l o c k

G N D

t s u

t h

V D D

G N D

Figure 2

C S

G N D

5 0 %

. I R S T

C l o c k

L A S T

C l o c k

G N D

W R , R D

C l o c k

t s u 1

t h 1

t C S

V D D

Figure 3

9 0 %

5 0 %

1 0 %

G N D

W R , R D

C l o c k

t f

t r

t C L K

V D D

Figure 1

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