HT1670 datasheet(7/20 Pages) HOLTEK

7 / 20 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

¾ Crystal oscillator

32768

fSYS3

System Clock

¾ External clock source

32768

fLCD1

LCD Frame Frequency

On-chip RC oscillator

61/117

89/170

111/213

fLCD2

LCD Frame Frequency

¾ Crystal oscillator

fLCD3

LCD Frame Frequency

¾ External clock source

tCOM

LCD Common Period

¾ n: Number of COM

n/fLCD

sec

fCLK1

4-Bit Data Clock (WR Pin)

Duty cycle 50%

¾¾

150

kHz

¾¾

300

kHz

fCLK2

4-Bit Data Clock (RD Pin)

Duty cycle 50%

¾¾

kHz

¾¾

150

kHz

tCS

4-Bit Interface Reset Pulse

Width (Figure 3)

¾ CS

150

250

tCLK

WR,RD Input Pulse Width

(Figure 1)

Write mode

3.34

¾¾

Read mode

6.67

Write mode

1.67

¾¾

Read mode

3.34

tr,tf

Rise/Fall Time Serial Data

Clock Width (Figure 1)

¾¾

120

160

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

ftone2k

Tone Frequency

On-chip RC oscillator

1.5

2.0

2.5

kHz

ftone4k

Tone Frequency

On-chip RC oscillato

3.0

4.0

5.0

kHz

HT1670

Rev. 1.60

November 9, 2010

PATENTED

HT1670 Datasheet(PDF) 7 Page - Holtek Semiconductor Inc

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