SM1155 series
Melody LSIs
OVERVIEW
The SM1155 series are CMOS melody LSIs that, together with a battery and piezoelectric buzzer. 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
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(Top view)
T2
7
VDD
3
6
OUT
VSS
4
5
OUT
8-pin SOP
PACKAGE DIMENSIONS
(Unit: mm)
+
0.15 − 0.1
0.05
4.4 ± 0.2
SM1155×××1S
2
TG
Package
TC
0.695typ
5.2 ± 0.3
1.5 ± 0.1
Device
8
T1
ORDERING INFORMATION
1
0.4 ± 0.2
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PINOUT
6.2 ± 0.3
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Requires few external components
1.2 to 3.6V wide operating voltage range
Low power consumption
Melody modes: Level hold 1
Oscillator stop function in non-play mode
Power saving pull-down resistor built-in
RC oscillator circuit
Power-ON initialization function
Wide pitch dynamic range (G3 to D7)
8-pin SOP package
0.05 ± 0.05
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1.27
0 to 10
0.10
0.4 ± 0.1
0.12 M
SEIKO NPC CORPORATION —1