SM1350AAQM

High Tone Quality Melody IC

SEIKO NPC CORPORATION - 1

OVERVIEW

The SM1350AAQM is single-chip high tone quality melody IC, fabricated using NPC’s Molybdenum-gate CMOS

process. Melodies are selected in serial or binary (parallel) mode, 6 programmable melodies are stored, and the high

tone quality melody is output by how to specify the user. It is making this IC ideal for mechanical clocks and similar

applications where high tone quality output is demanded.

FEATURES

PINOUT

■ Basic Functions

(Top view)

• 4.0MHz oscillator frequency

• Power-save function

- Oscillator stopped when no output

- S0 to S3, MODE, LH pull-up resistors open

• A-class output

• Chattering prevention circuit (STN, STOP, S0 to S3)

• 10-bit D/A converter current-summing

■ Sound Generator Functions

• DWS (dual wave synthesis) sound generators

• 4 simultaneous sounds for 4 tones

■ Melody Functions

• 6 programmable melodies

• Level hold/one-shot melody modes

• Serial/binary (parallel) select modes

PACKAGE DIMENSIONS

■ Control Signal Outputs

(Unit : mm)

VDD

S0

S1

S2

S3

MODE

LH

STOP

STN

BUSYN

CT

ICN

XT

XTN

TO

T3N

T2N

T1N

ENDN

EBUSYIN

SP

SPN

VOL

VSS

1

12

13

24

• BUSYN signal : LOW during melody output

• CT signal : pulse output synchronizing with selected

notes or rests

■ 2.4 to 5.5V supply voltage

■ Molybdenum-gate CMOS

■ Package : 24-pin SSOP

ORDERING INFOMATION

Device

Package

SM1350AAQM

24 pin SSOP