HT1632 datasheet(4/17 Pages) HOLTEK

4 / 17 page

A.C. Characteristics

Ta=25

°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

fSYS

System Clock

On-chip RC oscillator

256

kHz

fLED

LED Duty Cycle & Frame

Frequency

1/8 duty

97.5

1/16 duty

97.5

fCLK1

Serial Data Clock (WR pin)

Duty cycle 50%

300

kHz

fCLK2

Serial Data Clock (RD pin)

Duty cycle 50%

¾¾

150

kHz

tCS

Serial Interface Reset Pulse

Width

¾ CS

250

¾¾

tCLK

WR,RD Input Pulse Width

Write mode

1.67

¾¾

Read mode

3.34

¾¾

tr,tf

Rise/Fall Time Serial Data

Clock Width (Figure 1)

¾¾

120

¾¾

tsu

Setup Time for DATA to WR,

RD Clock Width (Figure 2)

¾¾

120

¾¾

Hold Time for DATA to WR,RD,

Clock Width (Figure 2)

¾¾

120

¾¾

tsu1

Setup Time for CS to WR,RD,

Clock Width (Figure 3)

¾¾

100

¾¾

th1

Hold Time for CS to WR,RD,

Clock Width (Figure 3)

¾¾

100

¾¾

HT1632

Rev. 1.00

October 2, 2007

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

t C L K

Figure 1

5 0 %

V a l i d D a t a

5 0 %

D A T A

W R , R D

C l o c k

G N D

t s u

t h

V D D

G N D

V D D

Figure 2

C S

G N D

5 0 %

F 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

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