HT814D0 datasheet(5/15 Pages) HOLTEK

5 / 15 page

Electrical Characteristics

Ta=25°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

VDD

Operating Voltage

¾¾

2.4

5.0

IDD

Operating Current

3V No load

200

400

ISTB

Standby Current

¾¾

Max. AUD Output Current

3V VOH=0.6V

-1.5

-2

IOL

FLAG Sink Current

3V 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

3V ROSC=530kW

116

kHz

HT814D0

March 15, 2000

Functional Description

The HT814D0 is a mask ROM type voice synthe-

sizer with 8.4-second voice capacity. A group of

pre-recorded voice sections is played upon receipt

of key trigger input signals. Two FLAG outputs

send signals are while playing voices.

The 8.4-second voice capacity can be divided into

sections of arbitrary length. Notice that the si-

lence 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. The re-

maining 10 keys (KEY2~KEY11) are used as di-

rect keys exclusively.

Play function block diagram

System oscillator

The HT814D0 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 process

of voice programming. As a result, the values of

the oscillator resistor may be different for different

items.

Ke y

t ri gger

Ke y

f eat ures

opt i o n

Ke y

f unc t i on

t abl e

RO M

Vo i c e

RO M

D/ A

P l ay c on t rol l ogi c

Fl a g

out p u t

V DD

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