Multimelody IC for Pagers
SM1124 Series
NIPPON PRECISION CIRCUITS INC.
Multimelody IC for Pagers
OVERVIEW
The SM1124 Series are melody pager mul...
Description
SM1124 Series
NIPPON PRECISION CIRCUITS INC.
Multimelody IC for Pagers
OVERVIEW
The SM1124 Series are melody pager multi-melody ICs fabricated in NPC’s Molybdenum-gate CMOS. A maximum of 16 tunes can be stored in programmable ROM, and the Molybdenum-gate CMOS process realizes small-sized packages and low power dissipation.
PINOUT
8-pin SOP
CLK SI SC ST
1
8
VSS VDD MTO
124
FEATURES
s
4
5
TEST
s s
s s s s s s
Maximum of 16 tune selections (with up to 512 steps) Level hold playback mode External reference clock input. The frequency can be selected from the following 12 settings. Playback frequency of each song varies (8 frequencies) - 32.768 kHz system: 32.768 and 65.536 kHz - 37.5 kHz system: 37.5 and 75.0 kHz - 38.4 kHz system: 38.4 and 76.8 kHz - 48.0 kHz system: 48.0 and 96.0 kHz Playback frequency of all songs is fixed (4 frequencies) - 32.768 kHz system: 131.072 kHz - 37.5 kHz system: 150.0 kHz - 38.4 kHz system: 153.6 kHz - 48.0 kHz system: 192.0 kHz 2-pin serial data tune selection Power save function External clock gating in non-play mode. 2.4 to 3.6 V supply voltage 8-pin plastic SOP package Molybdenum-gate CMOS process
PACKAGE DIMENSIONS
Unit: mm
4.4 0.2 6.2 0.3
5.2 0.3
0.15− 0.05
+ 0.10
0.05 0.05
1.27 0.4 0.1 0.695TYP
1.5 0.1
0 10
0.4 0.2
NIPPON PRECISION CIRCUITS—1
SM1124 Series
BLOCK DIAGRAM
CLK*
Gate
1/2 or 1/4 Divider 1/128
SW Scale Counter Scale ROM
VSS VDD MTO
SI* SC* ST* Control Circuit
Main ROM
Multiplexer Rhythm Counter
...
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