HT817D0 datasheet(5/15 Pages) HOLTEK

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Electrical Characteristics

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

VDD

Operating Voltage

¾¾

3.6

5.0

IDD

Operating Current

No load

200

400

ISTB

Standby Current

¾¾

Max. AUD Output Current

VOH=0.6V

-1.5

-2

IOL

FLAG Sink Current

VOL=0.3V

1.5

3.0

VIH

²H² Input Voltage

¾¾

0.8VDD

VDD

VIL

²L² Input Voltage

¾¾

0.2VDD

fOSC

Oscillating Frequency

ROSC=530kW

116

kHz

HT817D0

March 15, 2000

Functional Description

The HT817D0 is a mask ROM type voice synthe-

sizer with 16.8-second voice capacity. A group of

pre-recorded voice sections is played upon receipt

of key trigger input signals. Two FLAG signals

are output while playing voices.

The 16.8-second voice capacity can be divided

into sections of arbitrary length. Notice that the

silence length and end-pulse width are not in-

cluded in the memory.

By using Holtek¢s programming tools, the con-

tents and arrangement of sections, as well as

key features and FLAG output are all program-

mable before device fabrication.

The IC provides 12 key inputs (KEY1~KEY12).

Of the 12 keys, KEY1 can be optioned as a di-

rect, sequential or random trigger key. KEY12

can be selected as a stop or direct key. As for the

remaining 10 keys (KEY2~KEY11), they are

used as direct keys exclusively.

Play function block diagram

System oscillator

The HT817D0 has a built-in RC oscillator

which requires only one external resistor for

normal applications. The oscillator frequency

is typically 96kHz for an external resistor of

530kW. The required oscillator frequency may

vary with different sampling rates in the pro-

cess of voice programming. As a result, the

value of the oscillator resistor may be differ-

ent for different items.

Ke y

t ri g ger

Ke y

f eat ures

opt i o n

Ke y

fu n c ti o n

ta b l e

RO M

Vo i c e

RO M

D/ A

P l ay i ng c ont rol l og i c

Fl a g

out put

V DD

OS C 1

OS C 2

HT 8 1 7 D0

R OS C

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