HT2844
4-Sound Generator
Pin Assignment
Pad Assignment
Chip size: 81
67 (mil)
2
* The IC substrate should be connected to VDD
in the PCB layout artwork.
Features
Single power supply: 2.4V~3.3V
Low standby current: 1
A (Typ.)
at V
DD
= 3V
Auto power-off function
Eight different sound sections
Speaker or direct piezo application
LED flash drive output
Minimal external components
General Description
The HT2844 is a CMOS LSI chip designed for
use in sound effect products. It is equipped with
tone circuit, noise circuit, and other control
logic to generate various sounds including rifle
fire, machine gun, booming, door bell, Alarm,
and so forth. Customer's supplied sound source
can be analyzed and programmed into an inter-
nal ROM by changing a mask layer during de-
vice fabrication. The HT2844 is suitable for
various toy applications.
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11th July '97
Block Diagram
Pad Coordinates
Unit: mil
Pad No.
X
Y
Pad No.
X
Y
1
33.53
27.05
8
12.45
27.04
2
33.53
18.30
9
22.40
27.04
3
33.53
10.22
10
33.62
5.72
4
33.53
14.34
11
33.62
18.38
5
16.96
27.04
12
33.62
27.05
6
7.43
27.04
13
17.17
27.05
7
2.51
27.04
14
24.86
27.05
Pin Description
Pin No.
Pin Name
I/O
Description
1
TEST2
I/O
For IC test only
2
VDD
--
Positive power supply
3
NC
--
No connection
4
NC
--
No connection
5
OUT
O
Sound output
6
OUT
O
Sound output, out of phase to pin 5
7
VSS
--
Negative power supply, GND
8
TEST1
I
For IC test only
9
TEST3
I/O
For IC test only
10
OSC2
O
Oscillator output
11
OSC1
I
Oscillator input
HT2844
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11th July '97
Pin No.
Pin Name
I/O
Description
12
KEY1
I
KEY1 input, low active
13
KEY2
I
KEY2 input, low active
14
KEY3
I
KEY3 input, low active
15
KEY4
I
KEY4 input, low active
16
LED
O
LED flash output
Absolute Maximum Ratings*
Supply Voltage ................................. 0.3V to 5V
Storage Temperature................. 50
C to 125
C
Input Voltage.................... V
SS
0.3 to V
DD
+0.3V
Operating Temperature................... 0
C to 70
C
*Note: Stresses above those listed under "Absolute Maximum Ratings" may cause permanent
damageto the device. These are stress ratings only. Functional operation of this device at
these or any other conditions above those indicated in the operational sections of this
specification is not implied and exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
Electrical Characteristics
(Ta=25
C)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
DD
Conditions
V
DD
Operating Voltage
--
--
2.4
3
3.3
V
I
STB
Standby Current
3V
--
--
1
5
A
I
DD
Operating Current
3V
No load
--
300
600
A
I
OH
OUT Source Current
3V
V
OH
=2.5V
1
2
--
mA
I
OL
OUT Sink Current
3V
V
OL
=0.5V
1
2
--
mA
I
LED
LED Source Current
3V
V
OL
=2.5V
1
2
--
mA
F
OSC
Oscillator Frequency
--
R=220k
--
128
--
kHz
V
IH
"H" Input Voltage
3V
--
2.4
--
--
V
V
IL
"L" Input Voltage
3V
--
--
--
0.6
V
HT2844
3
11th July '97
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