SM1155 Datasheet, PDF (1/7 Pages) Nippon Precision Circuits Inc – Melody LSIs

NIPPON PRECISION CIRCUITS INC.
SM1155 series
Melody LSIs
OVERVIEW
The SM1155 series are CMOS melody LSIs that, together with a battery and piezoelectric buzzer, operate in
one of 3 melody modes determined by bonding options. They also feature an oscillator stop function in non-
play mode and a variable pull-down resistance function that responds to input levels in order to reduce power
consumption, reduce cost, and extend battery life, making them ideal in a wide range of applications including
the hold sound for telephones and toys.
FEATURES
I Requires few external components
I 1.2 to 3.6V wide operating voltage range
I Low power consumption
I 3 melody modes (bonding option)
I Oscillator stop function in non-play mode
I Power saving pull-down resistor built-in
I RC oscillator circuit
I Power-ON initialization function
I Wide pitch dynamic range (G₃ to D₇)
I 8-pin SOP package
ORDERING INFORMATION
Device
S M 1 1 5 5 ×××1 S
S M 1 1 5 5 ×××2 S
S M 1 1 5 5 ×××3 S
Package
8-pin SOP
PINOUT
(Top view)
T2 ₁
T1 2
TG ₃
VSS ₄
8 TC
7 VDD
6 OUT
5 OUT
PACKAGE DIMENSIONS
(Unit: mm)
0.15 _−^+00..015
0.695typ
5.2 ± 0.3
1.27
0.10
0.4 ± 0.1
0.12 M
0 to 10
NIPPON PRECISION CIRCUITS—1