SM1124 Series

NIPPON PRECISION CIRCUITS—2

BLOCK DIAGRAM

PIN DESCRIPTION

SPECIFICATIONS

Absolute Maximum Ratings

Number

Name

I/O

Function

1

CLK

I

External reference clock input (Schmitt-trigger circuit and gate circuit built-in)

2

SI

I

1. Pins SI, SC and ST have a built-in Schmitt-trigger circuit.

3

SC

I

4

ST

I

5

TEST

I

Test input pin. Leave open or tie to VSS. (Pull-down resistance built-in)

6

MTO

O

Playback signal output pin

7

VDD

–

Supply pin (+)

8

VSS

–

Ground pin

P arameter

Symbol

Condition

Rating

Unit

Supply voltage range

−0.3 to 5.0

V

Input voltage range

V

Power dissipation

150

mW

Storage temperature range

−40 to 125

°C

Soldering temperature

255

°C

Soldering time

10

s

Gate

1/2 or 1/4

SW

Divider

1/128

Scale

Counter

Scale

ROM

Tempo

Latch

Tempo

Counter

Rhythm

Counter

Address

Counter

Start

Address

Latch

Main

ROM

Control

Circuit

CLK*

SI*

SC*

ST*

VSS

VDD

MTO

TEST

Multi-

plexer

*: Built-in Schmmit-Triger Circuit.