HT3020.PDF

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HT3020A/B/C/D

One Rhythm Generator

Features

·

Operating Voltage: 2.4V~5.0V

·

One demo song

·

Directly drive an external transistor

·

End-pulse output

·

Low stand-by current

·

16 pin dual-in-line package

·

One percussion instrument

Applications

·

Toys

·

Sound effect generators

General Description

The HT3020A/B/C/D are all single-chip rhythm

generator LSIs implemented in the CMOS tech-

nology. These ICs provide a percussion instru-

ment sound and a demo-rhythm. Various types

of timbre and demo rhythm can be generated by

coding the internal ROM. The IC is offered in

either a dice form or 16 pin dual-in-line pack-

age.

Pin Assignment

Block Diagram

1

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HT3020A/B/C/D

Pad Coordinates

Unit:

m

m

Pad No.

X

Y

1

–949.75

–746.5

2

–764.75

–746.5

3

380.25

–746.5

4

565.25

–746.5

5

750.25

–746.5

6

944.25

–746.5

7

939.75

727

8

754.75

727

m) 2

* The substrate should be connected to VSS in the PCB layout artwork.

´

1860 (

m

Pin Description

Pin No. Pin Name I/O

Internal

Connection

Description

1

OSCI

I

—

Oscillator input pin

2

FLAG

O

NMOS

Open Drain

End pulse output, open drain, low active output

3

VSS

I

—

Negative power supply (GND)

4

NC

—

—

No connection.

5

KEY1

I

Pull-High

Trigger input for playing demo rhythm

Low active, retriggerable

6

KEY2

I

Pull-High

Trigger input for playing percussion instrument

Low active, retriggerable

7~13

NC

—

—

No connection

14

VDD

I

—

Positive power supply

15

AUD

O PMOS Output Voice output for driving an external transistor

16

OSCO

O

—

Oscillator output pin

2

25th June ’96

Chip size: 2160

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HT3020A/B/C/D

Absolute Maximum Ratings

Supply Voltage .............................. –0.3V to 6.0V

Storage Temperature................. –50

°

C to 125

°

C

Input Voltage................. V SS –0.3V to V DD +0.3V

Operating Temperature................... 0

°

C to 70

°

C

Electric Characteristics

(Ta=25

°

C)

Test Condition

Symbol

Parameter

Min.

Typ.

Max.

Unit

V DD Condition

V DD

Operating Voltage

—

—

2.4

—

5.0

V

I DD

Operation Current

3V No load

—

200

400

m

A

I STB

Stand-by Current

3V

—

—

1

5

m

A

I AUD

Max. AUD Output Current 3V V OH =0.6V

–1.5

–2

—

mA

I OL

FLAG Sink Current

3V V OL =0.3V

1.5

3.0

—

mA

V IL

“L” Input Voltage

—

—

—

—

0.2V DD

V

V IH

“H” Input Voltage

—

—

0.7V DD

—— V

F OSC

System Frequency

3V R OSC =320K

—

96

—

KHz

Functional Description

KEY2

When KEY2 is triggered, the built-in percus-

sion instrument comes into play. KEY2 is an

internal pull-high, low active, and retriggerable

input.

FLAG

FLAG outputs an end pulse at the end of any

playing. It is active low, and is an NMOS open

drain output.

Selection table

KEY1

When KEY1 is triggered, a section of the demo-

rhythm plays with the built-in percussion in-

strument. KEY1 is an internal pull-high, low

active, and retriggerable input.

Part No.

Percussion

Instrument

Demo-Rhythm

HT3020A Snare Drum

March

HT3020B

Conga

Latin

KEY priority

KEY1 > KEY2

HT3020C

Cymbal

Big-Band

HT3020D

High-Hat

Dance

KEY features

Pull-high resistance: 100k

m

s

3

25th June ’96

W

Key-in debounce time: 700

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HT3020A/B/C/D

Timing Diagram

Retriggerable

4

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HT3020A/B/C/D

Application Circuit

Chip form

Package form

5

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