HT814D0 データシートの表示（PDF） - Holtek Semiconductor
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HT814D0 Datasheet PDF : 15 Pages
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HT814D0
Electrical Characteristics
Symbol
Parameter
VDD
IDD
ISTB
IO
IOL
VIH
VIL
fOSC
Operating Voltage
Operating Current
Standby Current
Max. AUD Output Current
FLAG Sink Current
²H² Input Voltage
²L² Input Voltage
Oscillating Frequency
Test Conditions
VDD
¾
Conditions
¾
3V No load
3V
¾
3V VOH=0.6V
3V VOL=0.3V
¾
¾
¾
¾
3V ROSC=530kW
Ta=25°C
Min. Typ. Max. Unit
2.4
¾
5.0
V
¾
200 400
mA
¾
1
3
mA
-1.5 -2
¾
mA
1.5
3.0
¾
mA
0.8VDD ¾
VDD
V
0
¾ 0.2VDD V
76
96
116 kHz
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
V DD
K ey
tr ig g e r
K ey
fe a tu re s
o p tio n
K ey
fu n c tio n
ta b le
ROM
V o ic e
ROM
D /A
P la y c o n tr o l lo g ic
F la g
o u tp u t
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.
5
March 15, 2000
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