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.

FEATURES

■ 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