SM1124

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 ...